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

Gáspár Á Bakos, András Pál, David W. Latham, Robert W. Noyes, Robert P. Stefanik

Research output: Contribution to journalArticle

44 Scopus citations

Abstract

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's orbiting the primary in a clockwise orbit, lying nearly in the plane of the sky (i.e., nearly perpendicular to the orbital plane of the transiting planet), and with period of about 3200 years.

Original languageEnglish (US)
Pages (from-to)L57-L60
JournalAstrophysical Journal
Volume641
Issue number1 II
DOIs
StatePublished - Apr 10 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Binaries: close
  • Planetary systems
  • Stars: individual (HD 189733, HD 189733B)
  • Stars: low-mass, brown dwarfs

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