Radial Velocity Search for Extrasolar Planets in Visual Binary Systems

Details Radial Velocity Search for Extrasolar Planets in Visual Binary Systems Radial Velocity Search for Extrasolar Planets in Visual Binary Systems

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61...19t&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.61, No.1, pp.19--28

Astronomy and Astrophysics

Astronomy

5

Stars: Binaries: Visual, Stars: Planetary Systems, Techniques: Radial Velocities

Scientific paper

We searched for extrasolar planets in visual binary systems using precise Doppler-shift measurements taken over a period of 4 yr. Using the HIgh Dispersion Echelle Spectrograph (HIDES) equipped on the Okayama Astrophysical Observatory (OAO) 188cm reflector, we achieved a radial-velocity precision of about 10ms-1. We monitored both primary and secondary stars of six visual binary systems, and primary stars of three visual binaries. Among them, three objects show large radial-velocity variations. ADS 7311 A exhibits a decreasing trend in radial velocity with a best-fit slope of -30ms-1yr-1, while 31 Dra A shows an increasing trend with a best-fit slope of +220ms-1yr-1. These long-term trends in radial velocity may be attributable to unseen companions. BDS 10966 A shows a periodic variation in radial velocity with a period of 840 d and a semiamplitude of about 120ms-1, implying an association of a planetary-mass companion, rotational modulation, or nonradial oscillation of the photosphere. In any case, we should mention the nonassociation between BDS 10966 A and B, suggested by the different proper motions, radial velocities, and Hipparcos parallaxes.

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