HD 59686 Ab
Discovery[1][2]
Discovered byMitchell et al., Ortiz et al.
Discovery siteLick Observatory
Discovery dateNovember 16, 2003 (announced)
October 2016 (published)
Doppler spectroscopy
Orbital characteristics[2]
Epoch 2451482.024
1.0860+0.0006
−0.0007 AU
Eccentricity0.05+0.03
−0.02
299.36+0.26
−0.31 d
301°+26°
−85°
121°+28°
−24°
StarHD 59686 A
Physical characteristics[2]
Mass≥6.92+0.18
−0.24 MJ

    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

    1. 1 2 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.
    2. 1 2 3 4 5 6 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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