In:
Publications of the Astronomical Society of Japan, Oxford University Press (OUP), Vol. 61, No. 1 ( 2009-02-25), p. 19-28
Abstract:
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) 188 cm reflector, we achieved a radial-velocity precision of about 10 ms$^{-1}$. 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 $-$30 ms$^{-1}$yr$^{-1}$, while 31 Dra A shows an increasing trend with a best-fit slope of $+$220 ms$^{-1}$yr$^{-1}$. These long-term trends in radial velocity may be attributable to unseen companions. BDS 10966 A shows a periodic variation in radial velocity with a period of 840 d and a semiamplitude of about 120 ms$^{-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.
Type of Medium:
Online Resource
ISSN:
2053-051X
,
0004-6264
DOI:
10.1093/pasj/61.1.19
Language:
English
Publisher:
Oxford University Press (OUP)
Publication Date:
2009
detail.hit.zdb_id:
2083084-1
detail.hit.zdb_id:
282483-8
SSG:
16,12
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