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2MASS J09373487+2931409

2MASS 0937+2931 Credit: legacy surveys
Observation data Epoch J2000      Equinox J2000
Constellation	Leo
Right ascension	09 37 34.9
Declination	29° 31′ 41″
Characteristics
Spectral type	T6p
Astrometry
Proper motion (μ)	RA: 944.15 ± 1.24 mas/yr Dec.: −1319.78 ± 1.21 mas/yr
Parallax (π)	163.39 ± 1.76 mas
Distance	20.0 ± 0.2 ly (6.12 ± 0.07 pc)
Details
Mass	41.56±25.72 MJup
Radius	0.94±0.16 RJup
Luminosity	0.000005 L☉
Surface gravity (log g)	4.97±0.48 cgs
Temperature	881±74 K
Age	0.5-10 Gyr
Other designations
2MASS J09373487+2931409 2MASSI J0937347+293142 2MASS 0937+2931
Database references
SIMBAD	data
2MASS 0937+2931Location 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, located in the constellation Leo about 19.96 light-years from Earth.

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).

Distance

Currently the most precise distance estimate of 2MASS 0937+2931 is trigonometric parallax, published in 2009 by Schilbach et al.: 163.39 ± 1.76 mas, corresponding to a distance 6.12 ± 0.07 pc, or 19.96 ± 0.22 ly. A less precise parallax of this object, measured under U.S. Naval Observatory Infrared Astrometry Program, was published in 2004 by Vrba et al.

Properties

2MASS 0937+2931 has an unusual spectrum, indicating a metal-poor atmosphere and/or a high surface gravity (high pressure at the surface). 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. No optical variability was detected as in 2014.

See also

The other 10 brown dwarfs, presented in Burgasser et al. (2002):

• 2MASS 0243-2453 (T6)
• 2MASS 0415-0935 (T8)
• 2MASS 0727+1710 (T7)
• List of stars in Leo

References

1. ^ 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.
2. ^ 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
3. ^ 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.
4. "2MASS J09373487+2931409 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2012-11-26.
5. Vrba, F. J.; Henden, A. A.; Luginbuhl, C. B.; Guetter, H. H.; Munn, J. A.; Canzian, B.; Burgasser, Adam J.; Kirkpatrick, J. Davy; Fan, X.; Geballe, T. R.; Golimowski, D. A.; Knapp, G. R.; Leggett, S. K.; Schneider, D. P.; Brinkmann, J. (2004). "Preliminary Parallaxes of 40 L and T Dwarfs from the US Naval Observatory Infrared Astrometry Program". The Astronomical Journal. 127 (5): 2948–2968. arXiv:astro-ph/0402272. Bibcode:2004AJ....127.2948V. doi:10.1086/383554. S2CID 16344176.
6. "The 100 nearest star systems". Research Consortium on Nearby Stars. Georgia State University. January 1, 2012. Retrieved 2012-06-11.
7. 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)

v t e Constellation of Leo
List of stars in Leo Leo in Chinese astronomy
Stars	Bayer α (Regulus) β (Denebola) γ (Algieba) δ (Zosma) ε (Algenubi) ζ (Adhafera) η θ (Chertan) ι κ (Al Minliar al Asad) λ (Alterf) μ (Rasalas) ν ξ ο (Subra) π ρ σ τ υ φ χ ψ ω Flamsteed 3 6 (h) 7 8 9 10 11 12 13 15 (f) 18 19 20 21 22 (g) 23 26 31 (A) 33 34 35 37 39 40 42 43 44 45 46 48 49 50 51 (m) 52 (k) 53 (l) 54 55 56 57 58 (d) 59 (c) 60 (b) 61 (p) 62 (p) 64 65 (p) 66 67 69 (p) 71 72 73 (n) 75 76 79 80 81 82 83 85 86 87 (e) 88 89 90 92 93 95 (o) 6 LMi 18 LMi 49 LMi 52 LMi Variable R AD CN CW DP EE HR 4253 (p) 4459 (Formosa) HD 81040 88133 89307 96063 (Dingolay) 97658 99109 (Shama) 100777 (Sagarmatha) 102272 Other BD+20 2457 Gliese 408 Gliese 436 (Noquisi) GJ 3685 HVS 7 K2-3 K2-18 2MASSI J0937347+293142 2MASS J10475385+2124234 MACS J1149 Lensed Star 1 PSR B0943+10 PSR B0950+08 SDSS J102915+172927
Exoplanets γ Leonis b μ Leonis b υ Leonis b DP Leonis b Gliese 436 b (Awohali) HD 81040 b HD 88133 b HD 89307 b HD 89345 b HD 96063 b (Ramajay) HD 99109 b (Perwana) HD 100777 b (Laligurans) HD 102272 b c K2-18b c
Galaxies	Messier 65 66 95 96 105 NGC 2903 2906 2911 2964 3041 3048 3049 3177 3185 3187 3190 3193 3226 3227 3239 3274 3301 3357 3362 3367 3370 3377 3384 3412 3426 3447 3455 3489 3501 3506 3521 3524 3535 3593 3596 3598 3599 3602 3605 3607 3608 3628 3632 3640 3646 3647 3664 3666 3678 3686 3697 3705 3710 3758 3799 3800 3801 3805 3806 3810 3816 3821 3837 3840 3841 3842 3844 3845 3851 3857 3859 3860 3861 3862 3864 3867 3868 3873 3875 3883 3884 3886 3900 3902 3908 3925 3937 3947 3954 4005 Numbered I II III IV V Other Cosmic Horseshoe IC 2498 IC 2628 IRAS 10565+2448 J1000+1242 Leo P Leo T PSO J172.3556+18.7734 UGC 6614 UGC 6697
Category

• Leo (constellation)
• Brown dwarfs
• T-type brown dwarfs
• 2MASS objects
• Astronomical objects discovered in 2002