Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...597l.157s&link_type=abstract
The Astrophysical Journal, Volume 597, Issue 2, pp. L157-L160.
Astronomy and Astrophysics
Astronomy
82
Stars: Planetary Systems, Stars: Individual: Henry Draper Number: Hd 104985, Techniques: Radial Velocities
Scientific paper
We report the detection of a planetary-mass companion to the G9 III giant star HD 104985 from precise Doppler velocity measurements made using the High Dispersion Echelle Spectrograph (HIDES) at Okayama Astrophysical Observatory. The radial velocity variability of this star is best explained by an orbital motion with a period of 198.2+/-0.3 days, a velocity semiamplitude of 161+/-2 m s-1, and an eccentricity of 0.03+/-0.02. Assuming a stellar mass of 1.6 Msolar, we obtained a minimum mass and a semimajor axis of 6.3MJ and 0.78 AU, respectively, for the companion. A probable upper limit to the stellar mass of 3 Msolar yielded m2sini=9.6MJ, which falls in the planetary-mass regime. This is the first discovery of a planetary companion orbiting a G-type giant star.
Ando Hiroyasu
Izumiura Hideyuki
Kambe Eiji
Koyano Hisashi
Maehara Hideo
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