Gliese 176 b is a super-Earth exoplanet approximately 31 light years away in the constellation of Taurus. This planet orbits very close to its parent red dwarf star Gliese 176 (also called "HD 285968").
| Discovery | |
|---|---|
| Discovered by | Endl,[1] Forveille et al.[2] |
| Discovery date | September 7, 2007 |
| radial velocity | |
| Orbital characteristics | |
| 0.066±0.001 AU | |
| Eccentricity | 0.148+0.249 −0.036 |
| 8.776+0.001 −0.002 d | |
| 2450839.760 | |
| 150.6+42.2 −104.5 | |
| Semi-amplitude | 4.49+1.00 −0.23 |
| Star | Gliese 176 |
| Physical characteristics | |
| Temperature | ~450[2] |
The initial announcement confused the planetary periodicity with the stellar periodicity of 40 days, thus giving a 10.24 day period for a 25 Earth-mass planet.[1] Subsequent readings filtered out the star's rotation, giving a more accurate reading of the planet's orbit and minimum mass.
The planet orbits inside the inner magnetosphere of its star. The quoted temperature of 450 K is a "thermal equilibrium" temperature.[2]
It is projected to be dominated by a rocky core, but the true mass is unknown. If the orbit is oriented such that we are viewing it at a nearly face-on angle, the planet may be significantly more massive than the lower limit. If so, it may have attracted a gas envelope like Uranus or Gliese 436 b.[2]
References
edit- ^ a b Endl, Michael; et al. (2008). "An m sin i = 24 M⊕ Planetary Companion to the Nearby M Dwarf GJ 176". The Astrophysical Journal. 673 (2): 1165–1168. arXiv:0709.0944. Bibcode:2008ApJ...673.1165E. doi:10.1086/524703.
- ^ a b c d Forveille, Thierry; Bonfils, Xavier; Delfosse, Xavier; Gillon, Michaël; Udry, Stéphane; Bouchy, François; Lovis, Christophe; Mayor, Michel; Pepe, Francesco; Perrier, Christian; Queloz, Didier; Santos, Nuno C.; Bertaux, Jean-Loup (2009). "The HARPS search for southern extra-solar planets. XIV. Gl 176b, a super-Earth rather than a Neptune, and at a different period". Astronomy and Astrophysics. 493 (2): 645–650. arXiv:0809.0750. Bibcode:2009A&A...493..645F. doi:10.1051/0004-6361:200810557. Archived from the original on 2021-02-27. Retrieved 2018-03-16.
External links
edit- "Notes for planet HD 285968 b". Extrasolar Planets Encyclopaedia. Archived from the original on 2010-04-07.
- "HD 285968". Exoplanets. Archived from the original on 2012-02-12. Retrieved 2008-08-02.