Discovery of the Remarkably Red L/T Transition Object VHS J183135.58-551355.9
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2024
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| author | Bickle, Thomas P. Schneider, Adam C. Gagné, Jonathan Faherty, Jacqueline K. Rothermich, Austin Vos, Johanna M. Suárez, Genaro Kirkpatrick, J. Davy Meisner, Aaron M. Kuchner, Marc J. Burgasser, Adam J. Marocco, Federico Casewell, Sarah L. Caselden, Dan Gagliuffi, Daniella Bardalez Worlds, The Backyard : Collaboration, Planet 9 |
| author_facet | Bickle, Thomas P. Schneider, Adam C. Gagné, Jonathan Faherty, Jacqueline K. Rothermich, Austin Vos, Johanna M. Suárez, Genaro Kirkpatrick, J. Davy Meisner, Aaron M. Kuchner, Marc J. Burgasser, Adam J. Marocco, Federico Casewell, Sarah L. Caselden, Dan Gagliuffi, Daniella Bardalez Worlds, The Backyard : Collaboration, Planet 9 |
| contents | We present the discovery of VHS J183135.58$-$551355.9 (hereafter VHS J1831$-$5513), an L/T transition dwarf identified as a result of its unusually red near-infrared colors ($J-K_{\rm S}=3.633\pm0.277$ mag; $J-W2=6.249\pm0.245$ mag) from the VISTA Hemisphere Survey and CatWISE2020 surveys. We obtain low resolution near-infrared spectroscopy of VHS J1831$-$5513 using Magellan/FIRE to confirm its extremely red nature and assess features sensitive to surface gravity (i.e., youth). Its near-infrared spectrum shows multiple CH$_{\rm 4}$ absorption features, indicating an exceptionally low effective temperature for its spectral type. Based on proper motion measurements from CatWISE2020 and a photometric distance derived from its $K_{\rm S}$-band magnitude, we find that VHS J1831$-$5513 is a likely ($\sim$85$\%$ probability) kinematic member of the $β$ Pictoris moving group. Future radial velocity and trigonometric parallax measurements will clarify such membership. Follow-up mid-infrared or higher resolution near-infrared spectroscopy of this object will allow for further investigation as to the cause(s) of its redness, such as youth, clouds, and viewing geometry. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_03849 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Discovery of the Remarkably Red L/T Transition Object VHS J183135.58-551355.9 Bickle, Thomas P. Schneider, Adam C. Gagné, Jonathan Faherty, Jacqueline K. Rothermich, Austin Vos, Johanna M. Suárez, Genaro Kirkpatrick, J. Davy Meisner, Aaron M. Kuchner, Marc J. Burgasser, Adam J. Marocco, Federico Casewell, Sarah L. Caselden, Dan Gagliuffi, Daniella Bardalez Worlds, The Backyard : Collaboration, Planet 9 Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies We present the discovery of VHS J183135.58$-$551355.9 (hereafter VHS J1831$-$5513), an L/T transition dwarf identified as a result of its unusually red near-infrared colors ($J-K_{\rm S}=3.633\pm0.277$ mag; $J-W2=6.249\pm0.245$ mag) from the VISTA Hemisphere Survey and CatWISE2020 surveys. We obtain low resolution near-infrared spectroscopy of VHS J1831$-$5513 using Magellan/FIRE to confirm its extremely red nature and assess features sensitive to surface gravity (i.e., youth). Its near-infrared spectrum shows multiple CH$_{\rm 4}$ absorption features, indicating an exceptionally low effective temperature for its spectral type. Based on proper motion measurements from CatWISE2020 and a photometric distance derived from its $K_{\rm S}$-band magnitude, we find that VHS J1831$-$5513 is a likely ($\sim$85$\%$ probability) kinematic member of the $β$ Pictoris moving group. Future radial velocity and trigonometric parallax measurements will clarify such membership. Follow-up mid-infrared or higher resolution near-infrared spectroscopy of this object will allow for further investigation as to the cause(s) of its redness, such as youth, clouds, and viewing geometry. |
| title | Discovery of the Remarkably Red L/T Transition Object VHS J183135.58-551355.9 |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2405.03849 |