2MASS J09373487+2931409
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Leo[1] |
| Right ascension | 09h 37m 34.8797s[2] |
| Declination | +29° 31′ 40.991″[2] |
| Characteristics | |
| Spectral type | T6p[3] |
| Apparent magnitude (J) | 14.648±0.036[2] |
| Apparent magnitude (H) | 14.703±0.068[2] |
| Apparent magnitude (K) | 15.267±0.130[2] |
| Astrometry | |
| Proper motion (μ) | RA: +941.6 mas/yr[4] Dec.: −1324 mas/yr[4] |
| Parallax (π) | 167.19±1.22 mas[4] |
| Distance | 19.5 ± 0.1 ly (5.98 ± 0.04 pc) |
| Details | |
| Mass | 42±26[5] MJup |
| Radius | 0.94±0.16[5] RJup |
| Luminosity | 0.000005[5] L☉ |
| Surface gravity (log g) | 4.97±0.48[5] cgs |
| Temperature | 881±74[5] K |
| Other designations | |
| 2MASS J09373487+2931409 2MASSI J0937347+293142 2MASS 0937+2931 | |
| Database references | |
| SIMBAD | data |
  2MASS 0937+2931 Location of 2MASS 0937+2931 in the constellation Leo | |
2MASS J09373487+2931409, or 2MASSI J0937347+293142 (abbreviated to 2MASS 0937+2931) is a brown dwarf of spectral class T6,[3][6] located in the constellation Leo about 19.96 light-years from Earth.[7]
Discovery
2MASS 0937+2931 was discovered in 2002 by Adam J. Burgasser et al. from Two Micron All-Sky Survey (2MASS), conducted from 1997 to 2001. Follow-up observations were made in 1998–2001 using the Near-Infrared Camera, mounted on the Palomar 60 inch (1.5 m) Telescope; CTIO Infrared Imager (CIRIM) and Ohio State Infrared Imager/Spectrometer (OSIRIS), mounted on the Cerro Tololo Inter-American Observatory (CTIO) 1.5 m Telescope; and some additional observations were made using the Near Infrared Camera (NIRC), mounted on the Keck I 10 m telescope, and nearinfrared camera D78, mounted on the Palomar 5 m Hale Telescope. In 2002 Burgasser et al. published a paper, where they defined new spectral subtypes T1—T8, and presented discovery of 11 new T-type brown dwarfs, among which also was 2MASS 0937+2931. This 11 objects were among the earliest T-type brown dwarfs ever discovered: before this, the total number of known T-type objects was 13, and this discoveries increased it up to 24 (apart from additional T-type dwarfs, identified by Geballe et al. 2001 in SDSS data).[3]
Properties
Currently the most precise distance estimate of 2MASS 0937+2931 is a trigonometric parallax, published in 2026 by Vrba et al.: 167.19±1.22 mas, corresponding to a distance of 19.50 ± 0.13 light-years (5.98 ± 0.04 parsecs).[4]
2MASS 0937+2931 has an unusual spectrum, indicating a metal-poor atmosphere and/or a high surface gravity (high pressure at the surface).[3] Its effective temperature is estimated at 800 Kelvin. The Research Consortium On Nearby Stars (RECONS) estimates the brown dwarf to be 0.03 solar masses.[8] No optical variability was detected as in 2014.[9]
See also
Other brown dwarfs presented in Burgasser et al. (2002):[3]
- 2MASS 0243-2453 (T6)
- 2MASS 0415-0935 (T8)
- 2MASS 0727+1710 (T7)
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- 1 2 3 4 5 Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". Vizier Online Data Catalog. Bibcode:2003yCat.2246....0C.
- 1 2 3 4 5 Burgasser, Adam J.; Kirkpatrick, J. Davy; Brown, Michael E.; Reid, I. Neill; Burrows, Adam; Liebert, James; Matthews, Keith; Gizis, John E.; Dahn, Conard C.; Monet, David G.; Cutri, Roc M.; Skrutskie, Michael F. (2002). "The Spectra of T Dwarfs. I. Near-Infrared Data and Spectral Classification". The Astrophysical Journal. 564 (1): 421–451. arXiv:astro-ph/0108452. Bibcode:2002ApJ...564..421B. doi:10.1086/324033. S2CID 9273465.
- 1 2 3 4 Vrba, Frederick J.; Schneider, Adam C.; Munn, Jeffrey A.; Henden, Arne A.; Luginbuhl, Christain B.; Dahn, Conard C.; Guetter, Harry H.; Canzian, Blaise J.; Tilleman, Trudy M.; Dahm, Scott E.; Williams, Stephen J.; Bruursema, Justice E.; Kirkpatrick, J. Davy; Burgasser, Adam J. (2026-02-20). "Parallaxes, Proper Motions, and Near-infrared Photometry for 173 L and T Dwarfs from the US Naval Observatory Infrared Astrometry Program". The Astrophysical Journal. 999 (1): 24. arXiv:2601.09671. Bibcode:2026ApJ...999...24V. doi:10.3847/1538-4357/ae3963. ISSN 0004-637X.
- 1 2 3 4 5 Filippazzo, Joseph C.; Rice, Emily L.; Faherty, Jacqueline; Cruz, Kelle L.; Van Gordon, Mollie M.; Looper, Dagny L. (2015), "Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime", The Astrophysical Journal, 810 (2): 158, arXiv:1508.01767, Bibcode:2015ApJ...810..158F, doi:10.1088/0004-637X/810/2/158, S2CID 89611607
- ↑ "2MASS J09373487+2931409". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-11-26.
- ↑ Schilbach, E.; Röser, S.; Scholz, R.-D. (2009). "Trigonometric parallaxes of ten ultracool subdwarfs". Astronomy and Astrophysics. 493 (2): L27–L30. arXiv:0811.4136. Bibcode:2009A&A...493L..27S. doi:10.1051/0004-6361:200811281. S2CID 17774863.
- ↑ "The 100 nearest star systems". Research Consortium on Nearby Stars. Georgia State University. January 1, 2012. Retrieved 2012-06-11.
- ↑ Heinze, Aren N.; Metchev, Stanimir; Kellogg, Kendra (2014), "Weather on Other Worlds. III. A Survey for T Dwarfs with High-Amplitude Optical Variability", The Astrophysical Journal, 801 (2): 104, arXiv:1412.6733, doi:10.1088/0004-637X/801/2/104, S2CID 119217978
External links
- Burgasser et al.: A Method for Determining the Physical Properties of the Coldest Known Brown Dwarfs"; in: The Astrophysical Journal, Vol. 639, Issue 2, S. 1095ff. (2006)
- Cushing et al.: A Spitzer Infrared Spectrograph Spectral Sequence of M, L, and T Dwarfs"; in: The Astrophysical Journal, Vol. 648, Issue 1, S. 614ff. (2006)
