DENIS J081730.0−615520

DENIS J081730.0−615520 (also known as 2MASS 08173001−6155158) is a T brown dwarf approximately 16 ly (4.9 pc) away in the constellation Carina. It was discovered by Etienne Artigau and his colleagues in April 2010. The star belongs to the T6 spectral class implying a photosphere temperature of about 950 K. It has a mass of about 15 MJ (Jupiter masses) or about 1.5% the mass of the Sun.[2]

DENIS J081730.0−615520
DENIS J081730.0−615520 is located in the constellation Carina
DENIS J081730.0−615520 is located in the constellation Carina
DENIS J081730.0−615520
Location of DENIS J081730.0−615520 in the constellation Carina

Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 08h 17m 29.99888s[1]
Declination −61° 55′ 15.6586″[1]
Characteristics
Spectral type T6[2]
Apparent magnitude (J) 13.6
J−H color index 0.087 ± 0.039[2]
J−K color index 0.093 ± 0.049[2]
Astrometry
Proper motion (μ) RA: −156.451±0.507 mas/yr[1]
Dec.: 1099.366±0.503 mas/yr[1]
Parallax (π)191.8362 ± 0.4186 mas[1]
Distance17.00 ± 0.04 ly
(5.21 ± 0.01 pc)
Details
Mass0.015[2] M☉
Radius0.94±0.16[3] RJup
Temperature950[2] K
Rotation2.8±0.2 hours
Age1[3] Gyr
Other designations
DENIS J081730.0−615520
2MASS J08173001-6155158
WISEPA J081729.74−615504.1[4]
Database references
SIMBADdata

DENIS J081730.0-615520 is the second-nearest isolated T dwarf to the Sun (after UGPS J0722−0540) and the fifth-nearest (also after 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.[2]

References
  1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. Artigau, Etienne; Radigan, Jacqueline; Folkes, Stuart; et al. (2010). "DENIS J081730.0-615520: An overlooked mid-T dwarf in the solar neighborhood". The Astrophysical Journal Letters. 718 (1): L38–L42. arXiv:1006.3577. Bibcode:2010ApJ...718L..38A. doi:10.1088/2041-8205/718/1/L38. S2CID 118687449.
  3. Vos, Johanna M.; Biller, Beth A.; Allers, Katelyn N.; Faherty, Jacqueline K.; Liu, Michael C.; Metchev, Stanimir; Eriksson, Simon; Manjavacas, Elena; Dupuy, Trent J.; Janson, Markus; Radigan-Hoffman, Jacqueline; Crossfield, Ian; Bonnefoy, Mickaël; Best, William M. J.; Homeier, Derek; Schlieder, Joshua E.; Brandner, Wolfgang; Henning, Thomas; Bonavita, Mariangela; Buenzli, Esther (2020), "Spitzer Variability Properties of Low-gravity L Dwarfs", The Astronomical Journal, 160: 38, arXiv:2005.12854, doi:10.3847/1538-3881/ab9642, S2CID 218889787
  4. Kirkpatrick, J. Davy; Cushing, Michael C.; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Mainzer, Amy K.; Eisenhardt, Peter R.; McLean, Ian S.; Thompson, Maggie A.; Bauer, James M.; Benford, Dominic J.; Bridge, Carrie R.; Lake, Sean E.; Petty, Sara M.; Stanford, Spencer Adam; Tsai, Chao-Wei; Bailey, Vanessa; Beichman, Charles A.; Bloom, Joshua S.; Bochanski, John J.; Burgasser, Adam J.; Capak, Peter L.; Cruz, Kelle L.; Hinz, Philip M.; Kartaltepe, Jeyhan S.; Knox, Russell P.; Manohar, Swarnima; Masters, Daniel; Morales-Calderon, Maria; Prato, Lisa A.; Rodigas, Timothy J.; Salvato, Mara; Schurr, Steven D.; Scoville, Nicholas Z.; Simcoe, Robert A.; Stapelfeldt, Karl R.; Stern, Daniel; Stock, Nathan D.; Vacca, William D. (2011). "The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)". The Astrophysical Journal Supplement. 197 (2): 19. arXiv:1108.4677v1. Bibcode:2011ApJS..197...19K. doi:10.1088/0067-0049/197/2/19. S2CID 16850733.


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