HD 59686 Ab
Extrasolar planet in the constellation Gemini
HD 59686 Ab is an exoplanet that orbits the giant star HD 59686 A in a close binary star system. It has a nearly circular orbit with a period of 300 days and a semi-major axis of 1.09 AU, slightly greater than the distance between Earth and the Sun. It has a minimum mass 6.9 times that of Jupiter, with the true mass depending on the orbital inclination, which is not yet known.[2] HD 59686 Ab was discovered by radial velocity and first announced in November 2003,[1] but the discovery was not formally published until 2016.[2]
HD 59686, along with Nu Octantis, is one of the closest binary star systems known to host a planet orbiting a single star (i.e., not a circumbinary planet), posing a challenge to theories of planet formation.[2]
References
- ^ a b Mitchell, D.; Frink, S.; Quirrenbach, A.; Fischer, D.; Marcy, G.; Butler, P. (2003). "Four Substellar Companions Found Around Nearby K Giant Stars". Bulletin of the American Astronomical Society. 35: 1234. Bibcode:2003AAS...203.1703M.
- ^ a b c d e f Ortiz, Mauricio; et al. (October 2016), "Precise radial velocities of giant stars. IX. HD 59686 Ab: a massive circumstellar planet orbiting a giant star in a 13.6 au eccentric binary system", Astronomy & Astrophysics, 595: 14, arXiv:1608.00963, Bibcode:2016A&A...595A..55O, doi:10.1051/0004-6361/201628791, S2CID 26289447, A55.
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Constellation of Gemini
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