Discovery of the Remarkably Red L/T Transition Object VHS J183135.58-551355.9
arxiv(2024)
摘要
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_ S=3.633±0.277 mag; J-W2=6.249±0.245
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_ 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_ S-band magnitude, we find that
VHS J1831-5513 is a likely (∼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.
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