Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades

Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs. Here, we report the independent discovery of HIP 21152 B, the first imaged brown dwarf companio...
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Autor*in:	Kyle Franson [verfasserIn] Brendan P. Bowler [verfasserIn] Mariangela Bonavita [verfasserIn] Timothy D. Brandt [verfasserIn] Minghan Chen [verfasserIn] Matthias Samland [verfasserIn] Zhoujian Zhang [verfasserIn] Anna Lueber [verfasserIn] Kevin Heng [verfasserIn] Daniel Kitzmann [verfasserIn] Trevor Wolf [verfasserIn] Brandon A. Jones [verfasserIn] Quang H. Tran [verfasserIn] Daniella C. Bardalez Gagliuffi [verfasserIn] Beth Biller [verfasserIn] Jeffrey Chilcote [verfasserIn] Justin R. Crepp [verfasserIn] Trent J. Dupuy [verfasserIn] Jacqueline Faherty [verfasserIn] Clémence Fontanive [verfasserIn] Tyler D. Groff [verfasserIn] Raffaele Gratton [verfasserIn] Olivier Guyon [verfasserIn] Rebecca Jensen-Clem [verfasserIn] Nemanja Jovanovic [verfasserIn] N. Jeremy Kasdin [verfasserIn] Julien Lozi [verfasserIn] Eugene A. Magnier [verfasserIn] Koraljka Mužić [verfasserIn] Aniket Sanghi [verfasserIn] Christopher A. Theissen [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	Brown dwarfs Direct imaging T dwarfs Astrometry Orbit determination Atmospheric clouds

Übergeordnetes Werk:	In: The Astronomical Journal - IOP Publishing, 2022, 165(2023), 2, p 39
Übergeordnetes Werk:	volume:165 ; year:2023 ; number:2, p 39

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3847/1538-3881/aca408

Katalog-ID:	DOAJ089162374

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allfields	10.3847/1538-3881/aca408 doi (DE-627)DOAJ089162374 (DE-599)DOAJ10707f513bdd4aa18c59ad8d42494116 DE-627 ger DE-627 rakwb eng QB1-991 Kyle Franson verfasserin aut Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs. Here, we report the independent discovery of HIP 21152 B, the first imaged brown dwarf companion in the Hyades, and conduct a comprehensive orbital and atmospheric characterization of the system. HIP 21152 was targeted in an ongoing high-contrast imaging campaign of stars exhibiting proper-motion changes between Hipparcos and Gaia, and was also recently identified by Bonavita et al. (2022) and Kuzuhara et al. (2022). Our Keck/NIRC2 and SCExAO/CHARIS imaging of HIP 21152 revealed a comoving companion at a separation of 0.″37 (16 au). We perform a joint orbit fit of all available relative astrometry and radial velocities together with the Hipparcos-Gaia proper motions, yielding a dynamical mass of ${24}_{-4}^{+6}\,{M}_{\mathrm{Jup}}$ , which is 1–2 σ lower than evolutionary model predictions. Hybrid grids that include the evolution of cloud properties best reproduce the dynamical mass. We also identify a comoving wide-separation (1837″ or 7.9 × 10 ^4 au) early-L dwarf with an inferred mass near the hydrogen-burning limit. Finally, we analyze the spectra and photometry of HIP 21152 B using the Saumon & Marley (2008) atmospheric models and a suite of retrievals. The best-fit grid-based models have f _sed = 2, indicating the presence of clouds, T _eff = 1400 K, and $\mathrm{log}g=4.5\,\mathrm{dex}$ . These results are consistent with the object’s spectral type of T0 ± 1. As the first benchmark brown dwarf companion in the Hyades, HIP 21152 B joins the small but growing number of substellar companions with well-determined ages and dynamical masses. Brown dwarfs Direct imaging T dwarfs Astrometry Orbit determination Atmospheric clouds Astronomy Brendan P. Bowler verfasserin aut Mariangela Bonavita verfasserin aut Timothy D. Brandt verfasserin aut Minghan Chen verfasserin aut Matthias Samland verfasserin aut Zhoujian Zhang verfasserin aut Anna Lueber verfasserin aut Kevin Heng verfasserin aut Daniel Kitzmann verfasserin aut Trevor Wolf verfasserin aut Brandon A. Jones verfasserin aut Quang H. Tran verfasserin aut Daniella C. Bardalez Gagliuffi verfasserin aut Beth Biller verfasserin aut Jeffrey Chilcote verfasserin aut Justin R. Crepp verfasserin aut Trent J. Dupuy verfasserin aut Jacqueline Faherty verfasserin aut Clémence Fontanive verfasserin aut Tyler D. Groff verfasserin aut Raffaele Gratton verfasserin aut Olivier Guyon verfasserin aut Rebecca Jensen-Clem verfasserin aut Nemanja Jovanovic verfasserin aut N. Jeremy Kasdin verfasserin aut Julien Lozi verfasserin aut Eugene A. Magnier verfasserin aut Koraljka Mužić verfasserin aut Aniket Sanghi verfasserin aut Christopher A. Theissen verfasserin aut In The Astronomical Journal IOP Publishing, 2022 165(2023), 2, p 39 (DE-627)312175647 (DE-600)2003104-X 15383881 nnns volume:165 year:2023 number:2, p 39 https://doi.org/10.3847/1538-3881/aca408 kostenfrei https://doaj.org/article/10707f513bdd4aa18c59ad8d42494116 kostenfrei https://doi.org/10.3847/1538-3881/aca408 kostenfrei https://doaj.org/toc/1538-3881 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2006 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2110 GBV_ILN_2129 GBV_ILN_2522 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 165 2023 2, p 39
spelling	10.3847/1538-3881/aca408 doi (DE-627)DOAJ089162374 (DE-599)DOAJ10707f513bdd4aa18c59ad8d42494116 DE-627 ger DE-627 rakwb eng QB1-991 Kyle Franson verfasserin aut Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs. Here, we report the independent discovery of HIP 21152 B, the first imaged brown dwarf companion in the Hyades, and conduct a comprehensive orbital and atmospheric characterization of the system. HIP 21152 was targeted in an ongoing high-contrast imaging campaign of stars exhibiting proper-motion changes between Hipparcos and Gaia, and was also recently identified by Bonavita et al. (2022) and Kuzuhara et al. (2022). Our Keck/NIRC2 and SCExAO/CHARIS imaging of HIP 21152 revealed a comoving companion at a separation of 0.″37 (16 au). We perform a joint orbit fit of all available relative astrometry and radial velocities together with the Hipparcos-Gaia proper motions, yielding a dynamical mass of ${24}_{-4}^{+6}\,{M}_{\mathrm{Jup}}$ , which is 1–2 σ lower than evolutionary model predictions. Hybrid grids that include the evolution of cloud properties best reproduce the dynamical mass. We also identify a comoving wide-separation (1837″ or 7.9 × 10 ^4 au) early-L dwarf with an inferred mass near the hydrogen-burning limit. Finally, we analyze the spectra and photometry of HIP 21152 B using the Saumon & Marley (2008) atmospheric models and a suite of retrievals. The best-fit grid-based models have f _sed = 2, indicating the presence of clouds, T _eff = 1400 K, and $\mathrm{log}g=4.5\,\mathrm{dex}$ . These results are consistent with the object’s spectral type of T0 ± 1. As the first benchmark brown dwarf companion in the Hyades, HIP 21152 B joins the small but growing number of substellar companions with well-determined ages and dynamical masses. Brown dwarfs Direct imaging T dwarfs Astrometry Orbit determination Atmospheric clouds Astronomy Brendan P. Bowler verfasserin aut Mariangela Bonavita verfasserin aut Timothy D. Brandt verfasserin aut Minghan Chen verfasserin aut Matthias Samland verfasserin aut Zhoujian Zhang verfasserin aut Anna Lueber verfasserin aut Kevin Heng verfasserin aut Daniel Kitzmann verfasserin aut Trevor Wolf verfasserin aut Brandon A. Jones verfasserin aut Quang H. Tran verfasserin aut Daniella C. Bardalez Gagliuffi verfasserin aut Beth Biller verfasserin aut Jeffrey Chilcote verfasserin aut Justin R. Crepp verfasserin aut Trent J. Dupuy verfasserin aut Jacqueline Faherty verfasserin aut Clémence Fontanive verfasserin aut Tyler D. Groff verfasserin aut Raffaele Gratton verfasserin aut Olivier Guyon verfasserin aut Rebecca Jensen-Clem verfasserin aut Nemanja Jovanovic verfasserin aut N. Jeremy Kasdin verfasserin aut Julien Lozi verfasserin aut Eugene A. Magnier verfasserin aut Koraljka Mužić verfasserin aut Aniket Sanghi verfasserin aut Christopher A. Theissen verfasserin aut In The Astronomical Journal IOP Publishing, 2022 165(2023), 2, p 39 (DE-627)312175647 (DE-600)2003104-X 15383881 nnns volume:165 year:2023 number:2, p 39 https://doi.org/10.3847/1538-3881/aca408 kostenfrei https://doaj.org/article/10707f513bdd4aa18c59ad8d42494116 kostenfrei https://doi.org/10.3847/1538-3881/aca408 kostenfrei https://doaj.org/toc/1538-3881 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2006 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2110 GBV_ILN_2129 GBV_ILN_2522 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 165 2023 2, p 39
allfields_unstemmed	10.3847/1538-3881/aca408 doi (DE-627)DOAJ089162374 (DE-599)DOAJ10707f513bdd4aa18c59ad8d42494116 DE-627 ger DE-627 rakwb eng QB1-991 Kyle Franson verfasserin aut Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs. Here, we report the independent discovery of HIP 21152 B, the first imaged brown dwarf companion in the Hyades, and conduct a comprehensive orbital and atmospheric characterization of the system. HIP 21152 was targeted in an ongoing high-contrast imaging campaign of stars exhibiting proper-motion changes between Hipparcos and Gaia, and was also recently identified by Bonavita et al. (2022) and Kuzuhara et al. (2022). Our Keck/NIRC2 and SCExAO/CHARIS imaging of HIP 21152 revealed a comoving companion at a separation of 0.″37 (16 au). We perform a joint orbit fit of all available relative astrometry and radial velocities together with the Hipparcos-Gaia proper motions, yielding a dynamical mass of ${24}_{-4}^{+6}\,{M}_{\mathrm{Jup}}$ , which is 1–2 σ lower than evolutionary model predictions. Hybrid grids that include the evolution of cloud properties best reproduce the dynamical mass. We also identify a comoving wide-separation (1837″ or 7.9 × 10 ^4 au) early-L dwarf with an inferred mass near the hydrogen-burning limit. Finally, we analyze the spectra and photometry of HIP 21152 B using the Saumon & Marley (2008) atmospheric models and a suite of retrievals. The best-fit grid-based models have f _sed = 2, indicating the presence of clouds, T _eff = 1400 K, and $\mathrm{log}g=4.5\,\mathrm{dex}$ . These results are consistent with the object’s spectral type of T0 ± 1. As the first benchmark brown dwarf companion in the Hyades, HIP 21152 B joins the small but growing number of substellar companions with well-determined ages and dynamical masses. Brown dwarfs Direct imaging T dwarfs Astrometry Orbit determination Atmospheric clouds Astronomy Brendan P. Bowler verfasserin aut Mariangela Bonavita verfasserin aut Timothy D. Brandt verfasserin aut Minghan Chen verfasserin aut Matthias Samland verfasserin aut Zhoujian Zhang verfasserin aut Anna Lueber verfasserin aut Kevin Heng verfasserin aut Daniel Kitzmann verfasserin aut Trevor Wolf verfasserin aut Brandon A. Jones verfasserin aut Quang H. Tran verfasserin aut Daniella C. Bardalez Gagliuffi verfasserin aut Beth Biller verfasserin aut Jeffrey Chilcote verfasserin aut Justin R. Crepp verfasserin aut Trent J. Dupuy verfasserin aut Jacqueline Faherty verfasserin aut Clémence Fontanive verfasserin aut Tyler D. Groff verfasserin aut Raffaele Gratton verfasserin aut Olivier Guyon verfasserin aut Rebecca Jensen-Clem verfasserin aut Nemanja Jovanovic verfasserin aut N. Jeremy Kasdin verfasserin aut Julien Lozi verfasserin aut Eugene A. Magnier verfasserin aut Koraljka Mužić verfasserin aut Aniket Sanghi verfasserin aut Christopher A. Theissen verfasserin aut In The Astronomical Journal IOP Publishing, 2022 165(2023), 2, p 39 (DE-627)312175647 (DE-600)2003104-X 15383881 nnns volume:165 year:2023 number:2, p 39 https://doi.org/10.3847/1538-3881/aca408 kostenfrei https://doaj.org/article/10707f513bdd4aa18c59ad8d42494116 kostenfrei https://doi.org/10.3847/1538-3881/aca408 kostenfrei https://doaj.org/toc/1538-3881 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2006 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2110 GBV_ILN_2129 GBV_ILN_2522 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 165 2023 2, p 39
allfieldsGer	10.3847/1538-3881/aca408 doi (DE-627)DOAJ089162374 (DE-599)DOAJ10707f513bdd4aa18c59ad8d42494116 DE-627 ger DE-627 rakwb eng QB1-991 Kyle Franson verfasserin aut Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs. Here, we report the independent discovery of HIP 21152 B, the first imaged brown dwarf companion in the Hyades, and conduct a comprehensive orbital and atmospheric characterization of the system. HIP 21152 was targeted in an ongoing high-contrast imaging campaign of stars exhibiting proper-motion changes between Hipparcos and Gaia, and was also recently identified by Bonavita et al. (2022) and Kuzuhara et al. (2022). Our Keck/NIRC2 and SCExAO/CHARIS imaging of HIP 21152 revealed a comoving companion at a separation of 0.″37 (16 au). We perform a joint orbit fit of all available relative astrometry and radial velocities together with the Hipparcos-Gaia proper motions, yielding a dynamical mass of ${24}_{-4}^{+6}\,{M}_{\mathrm{Jup}}$ , which is 1–2 σ lower than evolutionary model predictions. Hybrid grids that include the evolution of cloud properties best reproduce the dynamical mass. We also identify a comoving wide-separation (1837″ or 7.9 × 10 ^4 au) early-L dwarf with an inferred mass near the hydrogen-burning limit. Finally, we analyze the spectra and photometry of HIP 21152 B using the Saumon & Marley (2008) atmospheric models and a suite of retrievals. The best-fit grid-based models have f _sed = 2, indicating the presence of clouds, T _eff = 1400 K, and $\mathrm{log}g=4.5\,\mathrm{dex}$ . These results are consistent with the object’s spectral type of T0 ± 1. As the first benchmark brown dwarf companion in the Hyades, HIP 21152 B joins the small but growing number of substellar companions with well-determined ages and dynamical masses. Brown dwarfs Direct imaging T dwarfs Astrometry Orbit determination Atmospheric clouds Astronomy Brendan P. Bowler verfasserin aut Mariangela Bonavita verfasserin aut Timothy D. Brandt verfasserin aut Minghan Chen verfasserin aut Matthias Samland verfasserin aut Zhoujian Zhang verfasserin aut Anna Lueber verfasserin aut Kevin Heng verfasserin aut Daniel Kitzmann verfasserin aut Trevor Wolf verfasserin aut Brandon A. Jones verfasserin aut Quang H. Tran verfasserin aut Daniella C. Bardalez Gagliuffi verfasserin aut Beth Biller verfasserin aut Jeffrey Chilcote verfasserin aut Justin R. Crepp verfasserin aut Trent J. Dupuy verfasserin aut Jacqueline Faherty verfasserin aut Clémence Fontanive verfasserin aut Tyler D. Groff verfasserin aut Raffaele Gratton verfasserin aut Olivier Guyon verfasserin aut Rebecca Jensen-Clem verfasserin aut Nemanja Jovanovic verfasserin aut N. Jeremy Kasdin verfasserin aut Julien Lozi verfasserin aut Eugene A. Magnier verfasserin aut Koraljka Mužić verfasserin aut Aniket Sanghi verfasserin aut Christopher A. Theissen verfasserin aut In The Astronomical Journal IOP Publishing, 2022 165(2023), 2, p 39 (DE-627)312175647 (DE-600)2003104-X 15383881 nnns volume:165 year:2023 number:2, p 39 https://doi.org/10.3847/1538-3881/aca408 kostenfrei https://doaj.org/article/10707f513bdd4aa18c59ad8d42494116 kostenfrei https://doi.org/10.3847/1538-3881/aca408 kostenfrei https://doaj.org/toc/1538-3881 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2006 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2110 GBV_ILN_2129 GBV_ILN_2522 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 165 2023 2, p 39
allfieldsSound	10.3847/1538-3881/aca408 doi (DE-627)DOAJ089162374 (DE-599)DOAJ10707f513bdd4aa18c59ad8d42494116 DE-627 ger DE-627 rakwb eng QB1-991 Kyle Franson verfasserin aut Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs. Here, we report the independent discovery of HIP 21152 B, the first imaged brown dwarf companion in the Hyades, and conduct a comprehensive orbital and atmospheric characterization of the system. HIP 21152 was targeted in an ongoing high-contrast imaging campaign of stars exhibiting proper-motion changes between Hipparcos and Gaia, and was also recently identified by Bonavita et al. (2022) and Kuzuhara et al. (2022). Our Keck/NIRC2 and SCExAO/CHARIS imaging of HIP 21152 revealed a comoving companion at a separation of 0.″37 (16 au). We perform a joint orbit fit of all available relative astrometry and radial velocities together with the Hipparcos-Gaia proper motions, yielding a dynamical mass of ${24}_{-4}^{+6}\,{M}_{\mathrm{Jup}}$ , which is 1–2 σ lower than evolutionary model predictions. Hybrid grids that include the evolution of cloud properties best reproduce the dynamical mass. We also identify a comoving wide-separation (1837″ or 7.9 × 10 ^4 au) early-L dwarf with an inferred mass near the hydrogen-burning limit. Finally, we analyze the spectra and photometry of HIP 21152 B using the Saumon & Marley (2008) atmospheric models and a suite of retrievals. The best-fit grid-based models have f _sed = 2, indicating the presence of clouds, T _eff = 1400 K, and $\mathrm{log}g=4.5\,\mathrm{dex}$ . These results are consistent with the object’s spectral type of T0 ± 1. As the first benchmark brown dwarf companion in the Hyades, HIP 21152 B joins the small but growing number of substellar companions with well-determined ages and dynamical masses. Brown dwarfs Direct imaging T dwarfs Astrometry Orbit determination Atmospheric clouds Astronomy Brendan P. Bowler verfasserin aut Mariangela Bonavita verfasserin aut Timothy D. Brandt verfasserin aut Minghan Chen verfasserin aut Matthias Samland verfasserin aut Zhoujian Zhang verfasserin aut Anna Lueber verfasserin aut Kevin Heng verfasserin aut Daniel Kitzmann verfasserin aut Trevor Wolf verfasserin aut Brandon A. Jones verfasserin aut Quang H. Tran verfasserin aut Daniella C. Bardalez Gagliuffi verfasserin aut Beth Biller verfasserin aut Jeffrey Chilcote verfasserin aut Justin R. Crepp verfasserin aut Trent J. Dupuy verfasserin aut Jacqueline Faherty verfasserin aut Clémence Fontanive verfasserin aut Tyler D. Groff verfasserin aut Raffaele Gratton verfasserin aut Olivier Guyon verfasserin aut Rebecca Jensen-Clem verfasserin aut Nemanja Jovanovic verfasserin aut N. Jeremy Kasdin verfasserin aut Julien Lozi verfasserin aut Eugene A. Magnier verfasserin aut Koraljka Mužić verfasserin aut Aniket Sanghi verfasserin aut Christopher A. Theissen verfasserin aut In The Astronomical Journal IOP Publishing, 2022 165(2023), 2, p 39 (DE-627)312175647 (DE-600)2003104-X 15383881 nnns volume:165 year:2023 number:2, p 39 https://doi.org/10.3847/1538-3881/aca408 kostenfrei https://doaj.org/article/10707f513bdd4aa18c59ad8d42494116 kostenfrei https://doi.org/10.3847/1538-3881/aca408 kostenfrei https://doaj.org/toc/1538-3881 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2006 GBV_ILN_2014 GBV_ILN_2088 GBV_ILN_2110 GBV_ILN_2129 GBV_ILN_2522 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 165 2023 2, p 39
language	English
source	In The Astronomical Journal 165(2023), 2, p 39 volume:165 year:2023 number:2, p 39
sourceStr	In The Astronomical Journal 165(2023), 2, p 39 volume:165 year:2023 number:2, p 39
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	Brown dwarfs Direct imaging T dwarfs Astrometry Orbit determination Atmospheric clouds Astronomy
isfreeaccess_bool	true
container_title	The Astronomical Journal
authorswithroles_txt_mv	Kyle Franson @@aut@@ Brendan P. Bowler @@aut@@ Mariangela Bonavita @@aut@@ Timothy D. Brandt @@aut@@ Minghan Chen @@aut@@ Matthias Samland @@aut@@ Zhoujian Zhang @@aut@@ Anna Lueber @@aut@@ Kevin Heng @@aut@@ Daniel Kitzmann @@aut@@ Trevor Wolf @@aut@@ Brandon A. Jones @@aut@@ Quang H. Tran @@aut@@ Daniella C. Bardalez Gagliuffi @@aut@@ Beth Biller @@aut@@ Jeffrey Chilcote @@aut@@ Justin R. Crepp @@aut@@ Trent J. Dupuy @@aut@@ Jacqueline Faherty @@aut@@ Clémence Fontanive @@aut@@ Tyler D. Groff @@aut@@ Raffaele Gratton @@aut@@ Olivier Guyon @@aut@@ Rebecca Jensen-Clem @@aut@@ Nemanja Jovanovic @@aut@@ N. Jeremy Kasdin @@aut@@ Julien Lozi @@aut@@ Eugene A. Magnier @@aut@@ Koraljka Mužić @@aut@@ Aniket Sanghi @@aut@@ Christopher A. Theissen @@aut@@
publishDateDaySort_date	2023-01-01T00:00:00Z
hierarchy_top_id	312175647
id	DOAJ089162374
language_de	englisch
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Here, we report the independent discovery of HIP 21152 B, the first imaged brown dwarf companion in the Hyades, and conduct a comprehensive orbital and atmospheric characterization of the system. HIP 21152 was targeted in an ongoing high-contrast imaging campaign of stars exhibiting proper-motion changes between Hipparcos and Gaia, and was also recently identified by Bonavita et al. (2022) and Kuzuhara et al. (2022). Our Keck/NIRC2 and SCExAO/CHARIS imaging of HIP 21152 revealed a comoving companion at a separation of 0.″37 (16 au). We perform a joint orbit fit of all available relative astrometry and radial velocities together with the Hipparcos-Gaia proper motions, yielding a dynamical mass of ${24}_{-4}^{+6}\,{M}_{\mathrm{Jup}}$ , which is 1–2 σ lower than evolutionary model predictions. Hybrid grids that include the evolution of cloud properties best reproduce the dynamical mass. We also identify a comoving wide-separation (1837″ or 7.9 × 10 ^4 au) early-L dwarf with an inferred mass near the hydrogen-burning limit. Finally, we analyze the spectra and photometry of HIP 21152 B using the Saumon & Marley (2008) atmospheric models and a suite of retrievals. The best-fit grid-based models have f _sed = 2, indicating the presence of clouds, T _eff = 1400 K, and $\mathrm{log}g=4.5\,\mathrm{dex}$ . These results are consistent with the object’s spectral type of T0 ± 1. 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callnumber-first	Q - Science
author	Kyle Franson
spellingShingle	Kyle Franson misc QB1-991 misc Brown dwarfs misc Direct imaging misc T dwarfs misc Astrometry misc Orbit determination misc Atmospheric clouds misc Astronomy Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades
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topic_title	QB1-991 Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades Brown dwarfs Direct imaging T dwarfs Astrometry Orbit determination Atmospheric clouds
topic	misc QB1-991 misc Brown dwarfs misc Direct imaging misc T dwarfs misc Astrometry misc Orbit determination misc Atmospheric clouds misc Astronomy
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title	Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades
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title_full	Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades
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author_browse	Kyle Franson Brendan P. Bowler Mariangela Bonavita Timothy D. Brandt Minghan Chen Matthias Samland Zhoujian Zhang Anna Lueber Kevin Heng Daniel Kitzmann Trevor Wolf Brandon A. Jones Quang H. Tran Daniella C. Bardalez Gagliuffi Beth Biller Jeffrey Chilcote Justin R. Crepp Trent J. Dupuy Jacqueline Faherty Clémence Fontanive Tyler D. Groff Raffaele Gratton Olivier Guyon Rebecca Jensen-Clem Nemanja Jovanovic N. Jeremy Kasdin Julien Lozi Eugene A. Magnier Koraljka Mužić Aniket Sanghi Christopher A. Theissen
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title_sort	astrometric accelerations as dynamical beacons: discovery and characterization of hip 21152 b, the first t-dwarf companion in the hyades
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title_auth	Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades
abstract	Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs. Here, we report the independent discovery of HIP 21152 B, the first imaged brown dwarf companion in the Hyades, and conduct a comprehensive orbital and atmospheric characterization of the system. HIP 21152 was targeted in an ongoing high-contrast imaging campaign of stars exhibiting proper-motion changes between Hipparcos and Gaia, and was also recently identified by Bonavita et al. (2022) and Kuzuhara et al. (2022). Our Keck/NIRC2 and SCExAO/CHARIS imaging of HIP 21152 revealed a comoving companion at a separation of 0.″37 (16 au). We perform a joint orbit fit of all available relative astrometry and radial velocities together with the Hipparcos-Gaia proper motions, yielding a dynamical mass of ${24}_{-4}^{+6}\,{M}_{\mathrm{Jup}}$ , which is 1–2 σ lower than evolutionary model predictions. Hybrid grids that include the evolution of cloud properties best reproduce the dynamical mass. We also identify a comoving wide-separation (1837″ or 7.9 × 10 ^4 au) early-L dwarf with an inferred mass near the hydrogen-burning limit. Finally, we analyze the spectra and photometry of HIP 21152 B using the Saumon & Marley (2008) atmospheric models and a suite of retrievals. The best-fit grid-based models have f _sed = 2, indicating the presence of clouds, T _eff = 1400 K, and $\mathrm{log}g=4.5\,\mathrm{dex}$ . These results are consistent with the object’s spectral type of T0 ± 1. As the first benchmark brown dwarf companion in the Hyades, HIP 21152 B joins the small but growing number of substellar companions with well-determined ages and dynamical masses.
abstractGer	Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs. Here, we report the independent discovery of HIP 21152 B, the first imaged brown dwarf companion in the Hyades, and conduct a comprehensive orbital and atmospheric characterization of the system. HIP 21152 was targeted in an ongoing high-contrast imaging campaign of stars exhibiting proper-motion changes between Hipparcos and Gaia, and was also recently identified by Bonavita et al. (2022) and Kuzuhara et al. (2022). Our Keck/NIRC2 and SCExAO/CHARIS imaging of HIP 21152 revealed a comoving companion at a separation of 0.″37 (16 au). We perform a joint orbit fit of all available relative astrometry and radial velocities together with the Hipparcos-Gaia proper motions, yielding a dynamical mass of ${24}_{-4}^{+6}\,{M}_{\mathrm{Jup}}$ , which is 1–2 σ lower than evolutionary model predictions. Hybrid grids that include the evolution of cloud properties best reproduce the dynamical mass. We also identify a comoving wide-separation (1837″ or 7.9 × 10 ^4 au) early-L dwarf with an inferred mass near the hydrogen-burning limit. Finally, we analyze the spectra and photometry of HIP 21152 B using the Saumon & Marley (2008) atmospheric models and a suite of retrievals. The best-fit grid-based models have f _sed = 2, indicating the presence of clouds, T _eff = 1400 K, and $\mathrm{log}g=4.5\,\mathrm{dex}$ . These results are consistent with the object’s spectral type of T0 ± 1. As the first benchmark brown dwarf companion in the Hyades, HIP 21152 B joins the small but growing number of substellar companions with well-determined ages and dynamical masses.
abstract_unstemmed	Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs. Here, we report the independent discovery of HIP 21152 B, the first imaged brown dwarf companion in the Hyades, and conduct a comprehensive orbital and atmospheric characterization of the system. HIP 21152 was targeted in an ongoing high-contrast imaging campaign of stars exhibiting proper-motion changes between Hipparcos and Gaia, and was also recently identified by Bonavita et al. (2022) and Kuzuhara et al. (2022). Our Keck/NIRC2 and SCExAO/CHARIS imaging of HIP 21152 revealed a comoving companion at a separation of 0.″37 (16 au). We perform a joint orbit fit of all available relative astrometry and radial velocities together with the Hipparcos-Gaia proper motions, yielding a dynamical mass of ${24}_{-4}^{+6}\,{M}_{\mathrm{Jup}}$ , which is 1–2 σ lower than evolutionary model predictions. Hybrid grids that include the evolution of cloud properties best reproduce the dynamical mass. We also identify a comoving wide-separation (1837″ or 7.9 × 10 ^4 au) early-L dwarf with an inferred mass near the hydrogen-burning limit. Finally, we analyze the spectra and photometry of HIP 21152 B using the Saumon & Marley (2008) atmospheric models and a suite of retrievals. The best-fit grid-based models have f _sed = 2, indicating the presence of clouds, T _eff = 1400 K, and $\mathrm{log}g=4.5\,\mathrm{dex}$ . These results are consistent with the object’s spectral type of T0 ± 1. As the first benchmark brown dwarf companion in the Hyades, HIP 21152 B joins the small but growing number of substellar companions with well-determined ages and dynamical masses.
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container_issue	2, p 39
title_short	Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades
url	https://doi.org/10.3847/1538-3881/aca408 https://doaj.org/article/10707f513bdd4aa18c59ad8d42494116 https://doaj.org/toc/1538-3881
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up_date	2024-07-03T21:37:18.579Z
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fullrecord_marcxml	<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000naa a22002652 4500</leader><controlfield tag="001">DOAJ089162374</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20230505015856.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">230505s2023 xx \|\|\|\|\|o 00\| \|\|eng c</controlfield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">10.3847/1538-3881/aca408</subfield><subfield code="2">doi</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)DOAJ089162374</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-599)DOAJ10707f513bdd4aa18c59ad8d42494116</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="050" ind1=" " ind2="0"><subfield code="a">QB1-991</subfield></datafield><datafield tag="100" ind1="0" ind2=" "><subfield code="a">Kyle Franson</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">2023</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Benchmark brown dwarf companions with well-determined ages and model-independent masses are powerful tools to test substellar evolutionary models and probe the formation of giant planets and brown dwarfs. Here, we report the independent discovery of HIP 21152 B, the first imaged brown dwarf companion in the Hyades, and conduct a comprehensive orbital and atmospheric characterization of the system. HIP 21152 was targeted in an ongoing high-contrast imaging campaign of stars exhibiting proper-motion changes between Hipparcos and Gaia, and was also recently identified by Bonavita et al. (2022) and Kuzuhara et al. (2022). Our Keck/NIRC2 and SCExAO/CHARIS imaging of HIP 21152 revealed a comoving companion at a separation of 0.″37 (16 au). We perform a joint orbit fit of all available relative astrometry and radial velocities together with the Hipparcos-Gaia proper motions, yielding a dynamical mass of ${24}_{-4}^{+6}\,{M}_{\mathrm{Jup}}$ , which is 1–2 σ lower than evolutionary model predictions. Hybrid grids that include the evolution of cloud properties best reproduce the dynamical mass. We also identify a comoving wide-separation (1837″ or 7.9 × 10 ^4 au) early-L dwarf with an inferred mass near the hydrogen-burning limit. Finally, we analyze the spectra and photometry of HIP 21152 B using the Saumon & Marley (2008) atmospheric models and a suite of retrievals. The best-fit grid-based models have f _sed = 2, indicating the presence of clouds, T _eff = 1400 K, and $\mathrm{log}g=4.5\,\mathrm{dex}$ . These results are consistent with the object’s spectral type of T0 ± 1. As the first benchmark brown dwarf companion in the Hyades, HIP 21152 B joins the small but growing number of substellar companions with well-determined ages and dynamical masses.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Brown dwarfs</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Direct imaging</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">T dwarfs</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Astrometry</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Orbit determination</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Atmospheric clouds</subfield></datafield><datafield tag="653" ind1=" " ind2="0"><subfield code="a">Astronomy</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">Brendan P. 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Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-dwarf Companion in the Hyades

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