HD 202206 c is an extrasolar planet discovered on November 16, 2004, using long-term observation of a formerly unconfirmed second planet after the discovery of a brown dwarf (first companion) around the star HD 202206.[2]
| Discovery | |
|---|---|
| Discovered by | Correia et al. |
| Discovery date | November 16, 2004 |
| Radial velocity | |
| Orbital characteristics[1] | |
| 2.41 AU (361,000,000 km) | |
| Eccentricity | 0.22±0.03 |
| 1260±11 d | |
| Inclination | 7.7±1.1 |
| 91±11 | |
| 2453103±452 | |
| 280±4 | |
| Semi-amplitude | 0.041±0.001 km/s |
| Star | HD 202206 |
| Physical characteristics[1] | |
| Mass | 17.9+2.9 −1.8 MJ |
The planet orbits 3.07 times further out and is 85% less massive than the first companion, having a semi-amplitude of only 42 m/s. Its minimum mass is 2.44 times that of Jupiter and its diameter is likely roughly the same size as Jupiter's. The orbital resonance of the planet orbiting the brown dwarf is 5:1.[2]
Further observation of this system via astrometry revised this picture in 2017, showing that HD 202206 c is a brown dwarf or super-Jupiter, with a true mass 17.9 times that of Jupiter, in a circumbinary orbit around a pair of co-orbiting stars being viewed nearly face-on.[1]
References
edit- ^ a b c Benedict, G. Fritz; Harrison, Thomas E. (June 2017). "HD 202206: A Circumbinary Brown Dwarf System". The Astronomical Journal. 153 (6): 12. arXiv:1705.00659. Bibcode:2017AJ....153..258B. doi:10.3847/1538-3881/aa6d59. S2CID 119105717. 258.
- ^ a b Correia; et al. (2005). "A pair of planets around HD 202206 or a circumbinary planet?". Astronomy & Astrophysics. 440 (2): 751–758. arXiv:astro-ph/0411512. Bibcode:2005A&A...440..751C. doi:10.1051/0004-6361:20042376. S2CID 16175663.
External links
edit- EPE: HD 202206 c Archived 2010-04-07 at the Wayback Machine on The Extrasolar Planets Encyclopaedia
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