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A Stellar Companion in the HD 189733 System with a Known Transiting Extrasolar Planet
2006
Astrophysical Journal
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
doi:10.1086/503671
fatcat:opmcw34hpfhinky5wg2flupshe