2M 1237+6526
| Observation data Epoch {{{epoch}}} Equinox | |
|---|---|
| Constellation | Draco |
| Right ascension | 12h 37m 39.20s |
| Declination | +65° 26′ 14.8″ |
| Characteristics | |
| Spectral type | T6.5V |
| Apparent magnitude (K) | 16.15[1] |
| Astrometry | |
| Parallax (π) | 96.07 ± 4.78[1] mas |
| Distance | 34 ± 2 ly (10.4 ± 0.5 pc) |
| Details | |
| Mass | 0.035 M☉ |
| Radius | 0.11 R☉ |
| Luminosity | 6.25×10−6 L☉ |
| Temperature | 850[2] K |
| Age | ≥2-10[2] billion years |
| Other designations | |
2MASS J12373919+6526148, 2MASSI J1237392+652615, 2MASSW J1237392+652615 | |
| Database references | |
| SIMBAD | data |
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 the 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?
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.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (unconfirmed) | ≥3-12 MJ | ≤0.003 | ≥0.19 | ?0 | — | — |
References
- 1 2 3 Vrba, F. J.; Henden, A. A.; Luginbuhl, C. B.; Guetter, H. H.; Munn, J. A.; Canzian, B.; Burgasser, A. J.; Kirkpatrick, J. Davy; Fan, X.; Geballe, T. R.; Golimowski, D. A.; Knapp, G. R.; Leggett, S. K.; Schneider, D. P.; Brinkman, J. (2004). "Preliminary Parallaxes of 40 L and T Dwarfs from the U.S. Naval Observatory Infrared Astrometry Program". arXiv:astro-ph/0402272
. - 1 2 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.
- 1 2 3 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.