Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf

We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4 μ m wavelengths and the panchromatic 0.9–4.5 μ m coverage of the spectral energy...
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Autor*in:	Mario Nonino [verfasserIn] Karl Glazebrook [verfasserIn] Adam J. Burgasser [verfasserIn] Gianluca Polenta [verfasserIn] Takahiro Morishita [verfasserIn] Marius Lepinzan [verfasserIn] Marco Castellano [verfasserIn] Adriano Fontana [verfasserIn] Emiliano Merlin [verfasserIn] Andrea Bonchi [verfasserIn] Diego Paris [verfasserIn] Tommaso Treu [verfasserIn] Benedetta Vulcani [verfasserIn] Xin Wang [verfasserIn] Paola Santini [verfasserIn] Eros Vanzella [verfasserIn] Themiya Nanayakkara [verfasserIn] Amata Mercurio [verfasserIn] Piero Rosati [verfasserIn] Claudio Grillo [verfasserIn] Marusa Bradac [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2023

Schlagwörter:	T dwarfs

Übergeordnetes Werk:	In: The Astrophysical Journal Letters - IOP Publishing, 2022, 942(2023), 2, p L29
Übergeordnetes Werk:	volume:942 ; year:2023 ; number:2, p L29

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3847/2041-8213/ac8e5f

Katalog-ID:	DOAJ089149084

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allfields	10.3847/2041-8213/ac8e5f doi (DE-627)DOAJ089149084 (DE-599)DOAJe7631b0763a54014b8367a5061516473 DE-627 ger DE-627 rakwb eng QB460-466 Mario Nonino verfasserin aut Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4 μ m wavelengths and the panchromatic 0.9–4.5 μ m coverage of the spectral energy distribution. The unresolved point source has magnitudes F115W = 27.95 ± 0.15 and F444W = 25.84 ± 0.01 (AB), and its F115W−F444W and F356W−F444W colors match those expected for other known T dwarfs. We can exclude it as a reddened background star, high redshift quasar, or a very high redshift galaxy. Comparison with stellar atmospheric models indicates a temperature of T _eff ≈ 650 K and surface gravity $\mathrm{log}g\approx 5.25$ , implying a mass of 0.03 M _⊙ and age of 5 Gyr. We estimate the distance of this candidate to be 570–720 pc in a direction perpendicular to the Galactic plane, making it a likely thick disk or halo brown dwarf. These observations underscore the power of JWST to probe the very low-mass end of the substellar mass function in the Galactic thick disk and halo. T dwarfs Astrophysics Karl Glazebrook verfasserin aut Adam J. Burgasser verfasserin aut Gianluca Polenta verfasserin aut Takahiro Morishita verfasserin aut Marius Lepinzan verfasserin aut Marco Castellano verfasserin aut Adriano Fontana verfasserin aut Emiliano Merlin verfasserin aut Andrea Bonchi verfasserin aut Diego Paris verfasserin aut Tommaso Treu verfasserin aut Benedetta Vulcani verfasserin aut Xin Wang verfasserin aut Paola Santini verfasserin aut Eros Vanzella verfasserin aut Themiya Nanayakkara verfasserin aut Amata Mercurio verfasserin aut Piero Rosati verfasserin aut Claudio Grillo verfasserin aut Marusa Bradac verfasserin aut In The Astrophysical Journal Letters IOP Publishing, 2022 942(2023), 2, p L29 (DE-627)312189028 (DE-600)2006858-X 20418213 nnns volume:942 year:2023 number:2, p L29 https://doi.org/10.3847/2041-8213/ac8e5f kostenfrei https://doaj.org/article/e7631b0763a54014b8367a5061516473 kostenfrei https://doi.org/10.3847/2041-8213/ac8e5f kostenfrei https://doaj.org/toc/2041-8205 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_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2088 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 942 2023 2, p L29
spelling	10.3847/2041-8213/ac8e5f doi (DE-627)DOAJ089149084 (DE-599)DOAJe7631b0763a54014b8367a5061516473 DE-627 ger DE-627 rakwb eng QB460-466 Mario Nonino verfasserin aut Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4 μ m wavelengths and the panchromatic 0.9–4.5 μ m coverage of the spectral energy distribution. The unresolved point source has magnitudes F115W = 27.95 ± 0.15 and F444W = 25.84 ± 0.01 (AB), and its F115W−F444W and F356W−F444W colors match those expected for other known T dwarfs. We can exclude it as a reddened background star, high redshift quasar, or a very high redshift galaxy. Comparison with stellar atmospheric models indicates a temperature of T _eff ≈ 650 K and surface gravity $\mathrm{log}g\approx 5.25$ , implying a mass of 0.03 M _⊙ and age of 5 Gyr. We estimate the distance of this candidate to be 570–720 pc in a direction perpendicular to the Galactic plane, making it a likely thick disk or halo brown dwarf. These observations underscore the power of JWST to probe the very low-mass end of the substellar mass function in the Galactic thick disk and halo. T dwarfs Astrophysics Karl Glazebrook verfasserin aut Adam J. Burgasser verfasserin aut Gianluca Polenta verfasserin aut Takahiro Morishita verfasserin aut Marius Lepinzan verfasserin aut Marco Castellano verfasserin aut Adriano Fontana verfasserin aut Emiliano Merlin verfasserin aut Andrea Bonchi verfasserin aut Diego Paris verfasserin aut Tommaso Treu verfasserin aut Benedetta Vulcani verfasserin aut Xin Wang verfasserin aut Paola Santini verfasserin aut Eros Vanzella verfasserin aut Themiya Nanayakkara verfasserin aut Amata Mercurio verfasserin aut Piero Rosati verfasserin aut Claudio Grillo verfasserin aut Marusa Bradac verfasserin aut In The Astrophysical Journal Letters IOP Publishing, 2022 942(2023), 2, p L29 (DE-627)312189028 (DE-600)2006858-X 20418213 nnns volume:942 year:2023 number:2, p L29 https://doi.org/10.3847/2041-8213/ac8e5f kostenfrei https://doaj.org/article/e7631b0763a54014b8367a5061516473 kostenfrei https://doi.org/10.3847/2041-8213/ac8e5f kostenfrei https://doaj.org/toc/2041-8205 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_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2088 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 942 2023 2, p L29
allfields_unstemmed	10.3847/2041-8213/ac8e5f doi (DE-627)DOAJ089149084 (DE-599)DOAJe7631b0763a54014b8367a5061516473 DE-627 ger DE-627 rakwb eng QB460-466 Mario Nonino verfasserin aut Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4 μ m wavelengths and the panchromatic 0.9–4.5 μ m coverage of the spectral energy distribution. The unresolved point source has magnitudes F115W = 27.95 ± 0.15 and F444W = 25.84 ± 0.01 (AB), and its F115W−F444W and F356W−F444W colors match those expected for other known T dwarfs. We can exclude it as a reddened background star, high redshift quasar, or a very high redshift galaxy. Comparison with stellar atmospheric models indicates a temperature of T _eff ≈ 650 K and surface gravity $\mathrm{log}g\approx 5.25$ , implying a mass of 0.03 M _⊙ and age of 5 Gyr. We estimate the distance of this candidate to be 570–720 pc in a direction perpendicular to the Galactic plane, making it a likely thick disk or halo brown dwarf. These observations underscore the power of JWST to probe the very low-mass end of the substellar mass function in the Galactic thick disk and halo. T dwarfs Astrophysics Karl Glazebrook verfasserin aut Adam J. Burgasser verfasserin aut Gianluca Polenta verfasserin aut Takahiro Morishita verfasserin aut Marius Lepinzan verfasserin aut Marco Castellano verfasserin aut Adriano Fontana verfasserin aut Emiliano Merlin verfasserin aut Andrea Bonchi verfasserin aut Diego Paris verfasserin aut Tommaso Treu verfasserin aut Benedetta Vulcani verfasserin aut Xin Wang verfasserin aut Paola Santini verfasserin aut Eros Vanzella verfasserin aut Themiya Nanayakkara verfasserin aut Amata Mercurio verfasserin aut Piero Rosati verfasserin aut Claudio Grillo verfasserin aut Marusa Bradac verfasserin aut In The Astrophysical Journal Letters IOP Publishing, 2022 942(2023), 2, p L29 (DE-627)312189028 (DE-600)2006858-X 20418213 nnns volume:942 year:2023 number:2, p L29 https://doi.org/10.3847/2041-8213/ac8e5f kostenfrei https://doaj.org/article/e7631b0763a54014b8367a5061516473 kostenfrei https://doi.org/10.3847/2041-8213/ac8e5f kostenfrei https://doaj.org/toc/2041-8205 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_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2088 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 942 2023 2, p L29
allfieldsGer	10.3847/2041-8213/ac8e5f doi (DE-627)DOAJ089149084 (DE-599)DOAJe7631b0763a54014b8367a5061516473 DE-627 ger DE-627 rakwb eng QB460-466 Mario Nonino verfasserin aut Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4 μ m wavelengths and the panchromatic 0.9–4.5 μ m coverage of the spectral energy distribution. The unresolved point source has magnitudes F115W = 27.95 ± 0.15 and F444W = 25.84 ± 0.01 (AB), and its F115W−F444W and F356W−F444W colors match those expected for other known T dwarfs. We can exclude it as a reddened background star, high redshift quasar, or a very high redshift galaxy. Comparison with stellar atmospheric models indicates a temperature of T _eff ≈ 650 K and surface gravity $\mathrm{log}g\approx 5.25$ , implying a mass of 0.03 M _⊙ and age of 5 Gyr. We estimate the distance of this candidate to be 570–720 pc in a direction perpendicular to the Galactic plane, making it a likely thick disk or halo brown dwarf. These observations underscore the power of JWST to probe the very low-mass end of the substellar mass function in the Galactic thick disk and halo. T dwarfs Astrophysics Karl Glazebrook verfasserin aut Adam J. Burgasser verfasserin aut Gianluca Polenta verfasserin aut Takahiro Morishita verfasserin aut Marius Lepinzan verfasserin aut Marco Castellano verfasserin aut Adriano Fontana verfasserin aut Emiliano Merlin verfasserin aut Andrea Bonchi verfasserin aut Diego Paris verfasserin aut Tommaso Treu verfasserin aut Benedetta Vulcani verfasserin aut Xin Wang verfasserin aut Paola Santini verfasserin aut Eros Vanzella verfasserin aut Themiya Nanayakkara verfasserin aut Amata Mercurio verfasserin aut Piero Rosati verfasserin aut Claudio Grillo verfasserin aut Marusa Bradac verfasserin aut In The Astrophysical Journal Letters IOP Publishing, 2022 942(2023), 2, p L29 (DE-627)312189028 (DE-600)2006858-X 20418213 nnns volume:942 year:2023 number:2, p L29 https://doi.org/10.3847/2041-8213/ac8e5f kostenfrei https://doaj.org/article/e7631b0763a54014b8367a5061516473 kostenfrei https://doi.org/10.3847/2041-8213/ac8e5f kostenfrei https://doaj.org/toc/2041-8205 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_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2088 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 942 2023 2, p L29
allfieldsSound	10.3847/2041-8213/ac8e5f doi (DE-627)DOAJ089149084 (DE-599)DOAJe7631b0763a54014b8367a5061516473 DE-627 ger DE-627 rakwb eng QB460-466 Mario Nonino verfasserin aut Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4 μ m wavelengths and the panchromatic 0.9–4.5 μ m coverage of the spectral energy distribution. The unresolved point source has magnitudes F115W = 27.95 ± 0.15 and F444W = 25.84 ± 0.01 (AB), and its F115W−F444W and F356W−F444W colors match those expected for other known T dwarfs. We can exclude it as a reddened background star, high redshift quasar, or a very high redshift galaxy. Comparison with stellar atmospheric models indicates a temperature of T _eff ≈ 650 K and surface gravity $\mathrm{log}g\approx 5.25$ , implying a mass of 0.03 M _⊙ and age of 5 Gyr. We estimate the distance of this candidate to be 570–720 pc in a direction perpendicular to the Galactic plane, making it a likely thick disk or halo brown dwarf. These observations underscore the power of JWST to probe the very low-mass end of the substellar mass function in the Galactic thick disk and halo. T dwarfs Astrophysics Karl Glazebrook verfasserin aut Adam J. Burgasser verfasserin aut Gianluca Polenta verfasserin aut Takahiro Morishita verfasserin aut Marius Lepinzan verfasserin aut Marco Castellano verfasserin aut Adriano Fontana verfasserin aut Emiliano Merlin verfasserin aut Andrea Bonchi verfasserin aut Diego Paris verfasserin aut Tommaso Treu verfasserin aut Benedetta Vulcani verfasserin aut Xin Wang verfasserin aut Paola Santini verfasserin aut Eros Vanzella verfasserin aut Themiya Nanayakkara verfasserin aut Amata Mercurio verfasserin aut Piero Rosati verfasserin aut Claudio Grillo verfasserin aut Marusa Bradac verfasserin aut In The Astrophysical Journal Letters IOP Publishing, 2022 942(2023), 2, p L29 (DE-627)312189028 (DE-600)2006858-X 20418213 nnns volume:942 year:2023 number:2, p L29 https://doi.org/10.3847/2041-8213/ac8e5f kostenfrei https://doaj.org/article/e7631b0763a54014b8367a5061516473 kostenfrei https://doi.org/10.3847/2041-8213/ac8e5f kostenfrei https://doaj.org/toc/2041-8205 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_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2014 GBV_ILN_2088 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 942 2023 2, p L29
language	English
source	In The Astrophysical Journal Letters 942(2023), 2, p L29 volume:942 year:2023 number:2, p L29
sourceStr	In The Astrophysical Journal Letters 942(2023), 2, p L29 volume:942 year:2023 number:2, p L29
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	T dwarfs Astrophysics
isfreeaccess_bool	true
container_title	The Astrophysical Journal Letters
authorswithroles_txt_mv	Mario Nonino @@aut@@ Karl Glazebrook @@aut@@ Adam J. Burgasser @@aut@@ Gianluca Polenta @@aut@@ Takahiro Morishita @@aut@@ Marius Lepinzan @@aut@@ Marco Castellano @@aut@@ Adriano Fontana @@aut@@ Emiliano Merlin @@aut@@ Andrea Bonchi @@aut@@ Diego Paris @@aut@@ Tommaso Treu @@aut@@ Benedetta Vulcani @@aut@@ Xin Wang @@aut@@ Paola Santini @@aut@@ Eros Vanzella @@aut@@ Themiya Nanayakkara @@aut@@ Amata Mercurio @@aut@@ Piero Rosati @@aut@@ Claudio Grillo @@aut@@ Marusa Bradac @@aut@@
publishDateDaySort_date	2023-01-01T00:00:00Z
hierarchy_top_id	312189028
id	DOAJ089149084
language_de	englisch
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callnumber-first	Q - Science
author	Mario Nonino
spellingShingle	Mario Nonino misc QB460-466 misc T dwarfs misc Astrophysics Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf
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topic_title	QB460-466 Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf T dwarfs
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title	Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf
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title_full	Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf
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author_browse	Mario Nonino Karl Glazebrook Adam J. Burgasser Gianluca Polenta Takahiro Morishita Marius Lepinzan Marco Castellano Adriano Fontana Emiliano Merlin Andrea Bonchi Diego Paris Tommaso Treu Benedetta Vulcani Xin Wang Paola Santini Eros Vanzella Themiya Nanayakkara Amata Mercurio Piero Rosati Claudio Grillo Marusa Bradac
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title_sort	early results from glass-jwst. xiii. a faint, distant, and cold brown dwarf
callnumber	QB460-466
title_auth	Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf
abstract	We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4 μ m wavelengths and the panchromatic 0.9–4.5 μ m coverage of the spectral energy distribution. The unresolved point source has magnitudes F115W = 27.95 ± 0.15 and F444W = 25.84 ± 0.01 (AB), and its F115W−F444W and F356W−F444W colors match those expected for other known T dwarfs. We can exclude it as a reddened background star, high redshift quasar, or a very high redshift galaxy. Comparison with stellar atmospheric models indicates a temperature of T _eff ≈ 650 K and surface gravity $\mathrm{log}g\approx 5.25$ , implying a mass of 0.03 M _⊙ and age of 5 Gyr. We estimate the distance of this candidate to be 570–720 pc in a direction perpendicular to the Galactic plane, making it a likely thick disk or halo brown dwarf. These observations underscore the power of JWST to probe the very low-mass end of the substellar mass function in the Galactic thick disk and halo.
abstractGer	We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4 μ m wavelengths and the panchromatic 0.9–4.5 μ m coverage of the spectral energy distribution. The unresolved point source has magnitudes F115W = 27.95 ± 0.15 and F444W = 25.84 ± 0.01 (AB), and its F115W−F444W and F356W−F444W colors match those expected for other known T dwarfs. We can exclude it as a reddened background star, high redshift quasar, or a very high redshift galaxy. Comparison with stellar atmospheric models indicates a temperature of T _eff ≈ 650 K and surface gravity $\mathrm{log}g\approx 5.25$ , implying a mass of 0.03 M _⊙ and age of 5 Gyr. We estimate the distance of this candidate to be 570–720 pc in a direction perpendicular to the Galactic plane, making it a likely thick disk or halo brown dwarf. These observations underscore the power of JWST to probe the very low-mass end of the substellar mass function in the Galactic thick disk and halo.
abstract_unstemmed	We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4 μ m wavelengths and the panchromatic 0.9–4.5 μ m coverage of the spectral energy distribution. The unresolved point source has magnitudes F115W = 27.95 ± 0.15 and F444W = 25.84 ± 0.01 (AB), and its F115W−F444W and F356W−F444W colors match those expected for other known T dwarfs. We can exclude it as a reddened background star, high redshift quasar, or a very high redshift galaxy. Comparison with stellar atmospheric models indicates a temperature of T _eff ≈ 650 K and surface gravity $\mathrm{log}g\approx 5.25$ , implying a mass of 0.03 M _⊙ and age of 5 Gyr. We estimate the distance of this candidate to be 570–720 pc in a direction perpendicular to the Galactic plane, making it a likely thick disk or halo brown dwarf. These observations underscore the power of JWST to probe the very low-mass end of the substellar mass function in the Galactic thick disk and halo.
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title_short	Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf
url	https://doi.org/10.3847/2041-8213/ac8e5f https://doaj.org/article/e7631b0763a54014b8367a5061516473 https://doaj.org/toc/2041-8205
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up_date	2024-07-03T21:32:00.580Z
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