2M 1237+6526

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2M 1237+6526
Brown dwarf 2M 1237+6526 and companion.png
T-type brown dwarf 2M 1237+6526 and hypothetical companion.
Observation data
Epoch {{{epoch}}}      Equinox
Constellation Draco
Right ascension 12h 37m 39.20s
Declination +65° 26′ 14.8″
Spectral type T6.5V
Apparent magnitude (K) 16.15[1]
Parallax (π) 96.07 ± 4.78[1] mas
Distance 34 ± 2 ly
(10.4 ± 0.5 pc)
Mass 0.035 M
Radius 0.11 R
Luminosity 6.25x10-6 L
Temperature 850[2] K
Age ≥2-10[2] billion years
Other designations
2MASS J12373919+6526148, 2MASSI J1237392+652615, 2MASSW J1237392+652615
Database references

2MASS J12373919+6526148 (hereafter 2M 1237+6526) is a brown dwarf object with late spectral type T in the constellation of Draco, nearly 46 light-years away from Sun, although trigonometric parallax of 96.07 ± 4.78 mas yields distance of 33.9 ± 1.8 light-years (or 10.4 ± 0.5 parsecs).[1] The substellar object could likely host a very low-mass companion (yet undetected but inferred), possibly in planetary regime.[3]

A planetary companion?[edit]

Burgasser et al. (2003)[3] have inferred the presence of a low-mass companion orbiting the brown dwarf 2M 1237+6526. Such object would yield a mass between 3 and 12 times that of Jupiter and take nearly 4.56 hours (0.19 days) to revolve around its dim primary. If confirmed it would be the shortest period exoplanet and orbiting the faintest object so far. Accounting very faint luminosity of the primary (6.25/1,000,000th of Sun's luminosity), the water zone is located within 0.0025 Astronomical Units, so putative planet could likely retain great amounts of water] and ammonia. Moreover both the objects would appear the same size.

The 2M 1237+6526 system[3]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b (unconfirmed) ≥3-12 MJ ≤0.003 ≥0.19  ?0


  1. ^ a b c Vrba, F. J.; Henden; Luginbuhl; Guetter; Munn; Canzian; Burgasser; Kirkpatrick; Fan; Geballe; Golimowski; Knapp; Leggett; Schneider; Brinkmann (2004). "Preliminary Parallaxes of 40 L and T Dwarfs from the U.S. Naval Observatory Infrared Astrometry Program". arXiv:astro-ph/0402272.
  2. ^ a b Liebert & Burgasser (2007). "On the Nature of the Unique Hα-emitting T Dwarf 2MASS J12373919+6526148". Astronomy & Astrophysics 655 (1): 522–527. arXiv:astro-ph/0609793. Bibcode:2007ApJ...655..522L. doi:10.1086/509882. 
  3. ^ a b c Burgasser et al. (2003). "Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope WPFC2". The Astrophysical Journal 586 (1): 512–526. arXiv:astro-ph/0211470. Bibcode:2003ApJ...586..512B. doi:10.1086/346263.