A stellar companion in the HD 189733 system with a known transiting extrasolar planet

Details A stellar companion in the HD 189733 system with a known transiting extrasolar planet A stellar companion in the HD 189733 system with a known transiting extrasolar planet

2006-02-06

arxiv.org/abs/astro-ph/0602136v1

Astrophys.J.641:L57-L60,2006

Astronomy and Astrophysics

Astrophysics

4 pages, submitted to APJ Letters

Scientific paper

10.1086/503671

We show that the very close-by (19 pc) K0 star HD 189733, already found to be orbited by a transiting giant planet, is the primary of a double-star system, with the secondary being a mid-M dwarf with projected separation of about 216 AU from the primary. This conclusion is based on astrometry, proper motion and radial velocity measurements, spectral type determination and photometry. We also detect differential proper motion of the secondary. The data appear consistent with the secondary orbiting the primary in a clockwise orbit, lying nearly in the plane of the sky (that is, nearly perpendicular to the orbital plane of the transiting planet), and with period about 3200 years.

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