Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...576..478f&link_type=abstract
The Astrophysical Journal, Volume 576, Issue 1, pp. 478-484.
Astronomy and Astrophysics
Astronomy
88
Astrometry, Stars: Planetary Systems, Stars: Individual: Constellation Name: Ι Draconis
Scientific paper
We report precise radial velocity measurements of the K giant ι Dra (HD 137759, HR 5744, HIP 75458), carried out at Lick Observatory, which reveal the presence of a substellar companion orbiting the primary star. A Keplerian fit to the data yields an orbital period of about 536 days and an eccentricity of 0.70. Assuming a mass of 1.05 Msolar for ι Dra, the mass function implies a minimum companion mass m2sini of 8.9 MJ, making it a planet candidate. The corresponding semimajor axis is 1.3 AU. The nondetection of the orbital motion by Hipparcos allows us to place an upper limit of 45 MJ on the companion mass, establishing the substellar nature of the object. We estimate that transits in this system could occur already for inclinations as low as 81.5d, as a result of the large diameter of the giant star. The companion to ι Dra is the first brown dwarf or planet found to orbit a giant rather than a main-sequence star. Based on observations obtained at Lick Observatory, which is operated by the University of California.
Butler Paul R.
Fischer Debra Ann
Frink Sabine
Marcy Geoffrey W.
Mitchell David S.
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