Discovery of a Substellar Companion to the K Giant Star iota Dra

Details Discovery of a Substellar Companion to the K Giant Star iota Dra Discovery of a Substellar Companion to the K Giant Star iota Dra

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.6104f&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #61.04; Bulletin of the American Astronomical Society, Vol. 33, p.1398

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We report precise radial velocity measurements of the K giant iota Dra, which suggest that a substellar companion is orbiting the primary star in a rather eccentric orbit. High resolution spectra have been collected at Lick Observatory using the Iodine Cell technique over the past 18 months, achieving a radial velocity precision of about 5 m/s in a single measurement. The semi-amplitude of the observed radial velocity variations is about 300 m/s, and the shape of the curve is consistent with Keplerian variations caused by a substellar companion that could either be a giant planet or a Brown Dwarf. We consider it very unlikely for the particular case of iota Dra that the observed radial velocity variations are caused by non-radial pulsations or rotational modulation of surface features, though this might be the case for the radial velocity variations observed for most other K giants in our sample. Located at a distance of only 31 pc, we use the non-detection of the substellar companion by Hipparcos to derive an upper limit for the companion mass. The substellar companion to iota Dra seems to be first one found to orbit a giant rather than a solar-type star.

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