HD 202206 c

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]

HD 202206 c
Discovery
Discovered byCorreia et al.
Discovery dateNovember 16, 2004
Radial velocity
Orbital characteristics[1]
2.41 AU (361,000,000 km)
Eccentricity0.22±0.03
1260±11 d
Inclination7.7±1.1
91±11
2453103±452
280±4
Semi-amplitude0.041±0.001 km/s
StarHD 202206
Physical characteristics[1]
Mass17.9+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
    1. 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.
    2. 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.
    This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.