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DENIS J081730.0−615520

Star in the constellation Carina

Star in the constellation Carina

| j-h=0.087 ± 0.039 | j-k=0.093 ± 0.049

DENIS J081730.0−615520 (also known as 2MASS 08173001−6155158) is a T-type brown dwarf 17 ly away in the constellation Carina. It was discovered by Etienne Artigau and his colleagues in April 2010. The brown dwarf belongs to the T6 spectral class, with a photosphere temperature of about 1000 K. It has a mass of about 15 MJ (Jupiter masses) or about 1.5% the mass of the Sun.

DENIS J081730.0-615520 is the fourth-nearest isolated T dwarf to the Sun (after UGPS J0722−0540, WISE 1741+2553, and WISE 1506+7027) and the eighth-nearest (also after Luhman 16B, ε Indi Bab and SCR 1845-6357B) if one takes into account T dwarfs in multiple star systems. It is also the brightest T dwarf in the sky (in the J-band); it had been missed before due to its proximity to the galactic plane.

DENIS J081730.0−615520 was observed with Gemini South. This spectrum did result to the first detection of molecular hydrogen (H2) and the first detection of hydrogen sulfide (H2S) in an extrasolar atmosphere. Other molecules detected in the atmosphere of this brown dwarf are methane (CH4), water vapor (H2O), carbon monoxide (CO) and ammonia (NH3). The detection of H2 indicates that the atmosphere of DENIS J081730.0−615520 is almost dust-free.

References

References

  1. {{cite constellation. DENIS J081730.0-615520
  2. (2022-08-01). "A 1.46-2.48 μm spectroscopic atlas of a T6 dwarf (1060 K) atmosphere with IGRINS: first detections of H2S and H2, and verification of H2O, CH4, and NH3 line lists". Monthly Notices of the Royal Astronomical Society.
  3. {{Cite Gaia DR3. 5278042880077383040
  4. Artigau, Etienne. (2010). "DENIS J081730.0-615520: An overlooked mid-T dwarf in the solar neighborhood". The Astrophysical Journal Letters.
  5. (2011). "The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)". [[The Astrophysical Journal Supplement]].
  6. (October 2014). "Strong Brightness Variations Signal Cloudy-to-clear Transition of Brown Dwarfs". [[The Astrophysical Journal]].
  7. (2020). "Spitzer Variability Properties of Low-gravity L Dwarfs". The Astronomical Journal.
  8. (March 2021). "The Field Substellar Mass Function Based on the Full-sky 20 pc Census of 525 L, T, and Y Dwarfs". [[The Astrophysical Journal Supplement Series]].
  9. (30 April 2021). "The 10 parsec sample in the Gaia era". [[Astronomy & Astrophysics]].
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