- DENIS J081730.0-615520
-
DENIS J081730.0-615520 Observation data
Epoch J2000 Equinox J2000Constellation Carina Right ascension 08h 17m 30.096s[1] Declination −61° 55′ 15.802″[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 Radial velocity (Rv) ? km/s Proper motion (μ) RA: 336 ± 54 mas/yr
Dec.: 1095 ± 410 mas/yrParallax (π) 204.08 ± 12.49[2] mas Distance 16 ± 1 ly
(4.9 ± 0.3 pc)Details Mass 0.015[2] M☉ Radius ~0.1 R☉ Temperature 950[2] K DENIS J081730.0-615520 (also known as 2MASS 08173001-6155158) is a T dwarf star about 5 pc (16 light years) 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 is the second nearest isolated T dwarf to the Sun (after UGPS J0722-05) 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
- ^ a b Chris Gelino, Davy Kirkpatrick, Adam Burgasser. "List of T dwarfs". DwarfArchives. http://ldwarf.ipac.caltech.edu/archive/version5/viewlist.php?table=tdwarf&format=html. Retrieved August 14, 2010.
- ^ a b c d e f g h 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.
External links
- Astronomers Announce First Clear Evidence of a Brown Dwarf – STScI news release STScI-1995-48 (November 29, 1995)
- Brown dwarfs (NASA)
Star systems (including brown dwarf systems) within 15–20 light-years from Earth. Altair (16.69 ± 0.04 ly; 1 star)Sigma Draconis «Alsafi» (18.77 ± 0.02 ly; 1 star) • Eta Cassiopeiae «Achird» (19.39 ± 0.05 ly; 2 stars) • e (82 G.) Eridani (19.71 ± 0.02 ly; 1 star, 3 planets: planet b • planet c • planet d) • Delta Pavonis (19.92 ± 0.02 ly; 1 star)Groombridge 1618 (15.87 ± 0.04 ly; 1 star) • Omicron² (40) Eridani «Keid» (16.25 ± 0.02 ly; 3 stars) • 70 Ophiuchi (16.64 ± 0.07 ly; 2 stars) • 33 G. Librae (19.12 ± 0.08 ly; 3 stars, 1 brown dwarf) • 36 Ophiuchi (19.40 ± 0.05 ly; 3 stars) • Gliese 783 (19.62 ± 0.04 ly; 2 stars)Gliese 876 (15.21 ± 0.04 ly; 1 star, 4 planets: planet d • planet c • planet b • planet e) • GJ 1002 (15.31 ± 0.26 ly; 1 star) • LHS 288 (15.55 ly; 1 star) • Gliese 412 (15.86 ± 0.07 ly; 2 stars) • AD Leonis (15.94 ± 0.22 ly; 1 star) • Gliese 832 (16.14 ± 0.08 ly; 1 star, 1 planet: planet b) • EV Lacertae (16.46 ± 0.07 ly; 1 star) • Gliese 682 (16.47 ± 0.17 ly; 1 star) • GJ 3379 (17.10 ± 0.17 ly; 1 star) • Gliese 445 (17.42 ± 0.15 ly; 1 star) • Stein 2051 (18.07 ± 0.08 ly; 2 stars) • Gliese 229 (18.77 ± 0.11 ly; 1 star, 1 brown dwarf) • Gliese 752 (19.08 ± 0.06 ly; 2 stars: Gliese 752 A • Gliese 752 B) • YZ Canis Minoris (19.51 ± 0.24 ly; 1 star) • QY Aurigae (19.96 ± 0.22 ly; 2 stars)‡DQGliese 440 (15.09 ± 0.08 ly; 1 star) • GJ 1221 (19.80 ± 0.30 ly; 1 star)‡LP 944-020 (16.19 ± 0.35 ly; 1 brown dwarf) • 2MASS 1835+3259 (18.48 ± 0.05 ly; 1 brown dwarf)DEN 0255-4700 (16.20 ± 0.32 ly; 1 brown dwarf)UGPS 0722-05 (13.3 ± 2.0 ly; 1 brown dwarf)‡ • WISE 1506+7027 (~16.0 ly; 1 brown dwarf)‡ • DEN 0817-6155 (16.1 + 1.1/- 1.0 ly; 1 brown dwarf) • 2MASS 0939-2448 (17.41 ± 0.44 ly; 2 brown dwarfs) • WISE 1741+2553 (17.9 + 3.3/- 3.1 ly; 1 brown dwarf)‡ • 2MASS 0415-0935 (18.71 ± 0.30 ly; 1 brown dwarf) • WISE 0254+0223 (19.8 + 7.6/- 4.3 ly; 1 brown dwarf)‡ • 2MASS 0937+2931 (19.97 ± 0.20 ly; 1 brown dwarf)‡ • SIMP J013656.5+093347 (20.9 ± 1.0 ly; 1 brown dwarf)‡WISE 2056+1459 (9.8 + 11.1/- 2.0 ly; 1 brown dwarf)‡ • WISE 1738+2732 (11.1 + 12.7/- 0 ly; 1 brown dwarf)‡ • WISE 0410+1502 (23.2 + 5.2/- 12.7 ly; 1 brown dwarf)‡In left column are stellar classes of primary members of star systems. ‡Distance error margin extends out of declared distance interval. Bold are systems containing at least one component with absolute magnitude of +8.5 or brighter. Italic are systems possibly located within declared distance interval, but probably not. Stars of Carina Bayer Nearby NN 3618List Categories:- Brown dwarfs
- Carina constellation
Wikimedia Foundation. 2010.
