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.[2] The brown dwarf belongs to the T6 spectral class, with a photosphere temperature of about 1000 K.[5] It has a mass of about 15 MJ (Jupiter masses) or about 1.5% the mass of the Sun.[failed verification]
  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) | 13.613±0.024[2] |
| J−H color index | 0.087 ± 0.039[2] |
| J−K color index | 0.093 ± 0.049[2] |
| Astrometry | |
| Radial velocity (Rv) | 6.1 ± 0.5[3] km/s |
| Proper motion (μ) | RA: −156.451(507) mas/yr[1] Dec.: 1,099.366(503) mas/yr[1] |
| Parallax (π) | 191.8362 ± 0.4186 mas[1] |
| Distance | 17.00 ± 0.04 ly (5.21 ± 0.01 pc) |
| Details | |
| Radius | 0.94±0.16[4] RJup |
| Surface gravity (log g) | 5.0 ± 0.1[3] cgs |
| Temperature | 1004±91[5] K |
| Rotation | 2.8±0.2 hours[6] |
| Rotational velocity (v sin i) | 22.5 ± 0.9[3] km/s |
| Age | 1[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.[8] 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]
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.[3]
References
edit- ^ a b c d 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.
- ^ a b c d e f 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.
- ^ a b c d 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. arXiv:2206.03519. Bibcode:2022MNRAS.514.3160T. doi:10.1093/mnras/stac1412. ISSN 0035-8711.
- ^ a b 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 (1): 38, arXiv:2005.12854, Bibcode:2020AJ....160...38V, doi:10.3847/1538-3881/ab9642, S2CID 218889787
- ^ a b Kirkpatrick, J. Davy; Gelino, Christopher R.; 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. arXiv:2011.11616. Bibcode:2021ApJS..253....7K. doi:10.3847/1538-4365/abd107. S2CID 227126954.
- ^ 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. arXiv:1404.3247. Bibcode:2014ApJ...793...75R. doi:10.1088/0004-637X/793/2/75. S2CID 118357522.
- ^ 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.
- ^ 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. arXiv:2104.14972. Bibcode:2021A&A...650A.201R. doi:10.1051/0004-6361/202140985. S2CID 233476431. Data available at https://gruze.org/10pc/
External links
edit- Astronomers Announce First Clear Evidence of a Brown Dwarf – STScI news release STScI-1995-48 (November 29, 1995)