Astronomy:DENIS J081730.0−615520

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Short description: Star in the constellation Carina

Coordinates: Sky map 08h 17m 30.096s, −61° 55′ 15.802″

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
Equinox J2000.0]] (ICRS)
Constellation Carina[1]
Right ascension  08h 17m 29.99888s[2]
Declination −61° 55′ 15.6586″[2]
Characteristics
Spectral type T6[3]
Apparent magnitude (J) 13.613±0.024[3]
J−H color index 0.087 ± 0.039[3]
J−K color index 0.093 ± 0.049[3]
Astrometry
Radial velocity (Rv)6.1 ± 0.5[4] km/s
Proper motion (μ) RA: −156.451(507)[2] mas/yr
Dec.: 1,099.366(503)[2] mas/yr
Parallax (π)191.8362 ± 0.4186[2] mas
Distance17.00 ± 0.04 ly
(5.21 ± 0.01 pc)
Details
Radius0.94±0.16[5] RJup
Surface gravity (log g)5.0±0.1[4] cgs
Temperature1004±91[6] K
Rotation2.8±0.2 hours[7]
Rotational velocity (v sin i)22.5±0.9[4] km/s
Age1[5] Gyr
Other designations
DENIS J081730.0−615520, 2MASS J08173001-6155158, WISEPA J081729.74−615504.1[8]
Database references
SIMBADdata

DENIS J081730.0−615520 (also known as 2MASS 08173001−6155158) is a T-type brown dwarf 17 light-years (5.2 parsecs) away in the constellation Carina. It was discovered by Etienne Artigau and his colleagues in April 2010.[3] The brown dwarf belongs to the T6 spectral class, with a photosphere temperature of about 1000 K.[6] 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.[9] 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.[3]

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.[4]

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Artigau, Etienne et al. (2010). "DENIS J081730.0-615520: An overlooked mid-T dwarf in the solar neighborhood". The Astrophysical Journal Letters 718 (1): L38–L42. doi:10.1088/2041-8205/718/1/L38. Bibcode: 2010ApJ...718L..38A. 
  4. ↑ 4.0 4.1 4.2 4.3 Tannock, Megan E.; Metchev, Stanimir; Hood, Callie E.; Mace, Gregory N.; Fortney, Jonathan J.; Morley, Caroline V.; Jaffe, Daniel T.; Lupu, Roxana (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 514 (3): 3160–3178. doi:10.1093/mnras/stac1412. ISSN 0035-8711. Bibcode: 2022MNRAS.514.3160T. 
  5. ↑ 5.0 5.1 Vos, Johanna M.; Biller, Beth A.; Allers, Katelyn N.; Faherty, Jacqueline K.; Liu, Michael C.; Metchev, Stanimir; Eriksson, Simon; Manjavacas, Elena et al. (2020). "Spitzer Variability Properties of Low-gravity L Dwarfs". The Astronomical Journal 160 (1): 38. doi:10.3847/1538-3881/ab9642. Bibcode: 2020AJ....160...38V. 
  6. ↑ 6.0 6.1 Kirkpatrick, J. Davy et al. (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 253 (1): 7. doi:10.3847/1538-4365/abd107. Bibcode: 2021ApJS..253....7K. 
  7. ↑ Radigan, Jacqueline; Lafrenière, David; Jayawardhana, Ray (October 2014). "Strong Brightness Variations Signal Cloudy-to-clear Transition of Brown Dwarfs". The Astrophysical Journal 793 (2): 75. doi:10.1088/0004-637X/793/2/75. Bibcode: 2014ApJ...793...75R. 
  8. ↑ Kirkpatrick, J. Davy; Cushing, Michael C.; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Mainzer, Amy K. et al. (2011). "The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)". The Astrophysical Journal Supplement 197 (2): 19. doi:10.1088/0067-0049/197/2/19. Bibcode: 2011ApJS..197...19K. 
  9. ↑ Reylé, Céline; Jardine, Kevin; Fouqué, Pascal; Caballero, Jose A.; Smart, Richard L.; Sozzetti, Alessandro (30 April 2021). "The 10 parsec sample in the Gaia era". Astronomy & Astrophysics 650: A201. doi:10.1051/0004-6361/202140985. Bibcode: 2021A&A...650A.201R.  Data available at https://gruze.org/10pc/



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