The transit light curve project. v. system parameters and stellar rotation period of HD 189733

Joshua N. Winn, Matthew J. Holman, Gregory W. Henry, Anna Roussanova, Keigo Enya, Yuzuru Yoshi, Avi Shporer, Tsevi Mazeh, John Asher Johnson, Norio Narita, Yasushi Suto

Research output: Contribution to journalArticle

119 Scopus citations

Abstract

We present photometry of HD 189733 during eight transits of its close-in giant planet, and out-of-transit photometry spanning 2 yr. Using the transit photometry, we determine the stellar and planetary radii and the photometric ephemeris. Outside of transits, there are quasi-periodic flux variations with a 13.4 day period that we attribute to stellar rotation. In combination with previous results, we derive upper limits on the orbital eccentricity and on the true angle between the stellar rotation axis and planetary orbit (as opposed to the angle between the projections of those axes on the sky).

Original languageEnglish (US)
Pages (from-to)1828-1835
Number of pages8
JournalAstronomical Journal
Volume133
Issue number4
DOIs
StatePublished - Apr 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Planetary systems
  • Planetary systems: Formation
  • Stars: individual (HD 189733)
  • Stars: rotation

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    Winn, J. N., Holman, M. J., Henry, G. W., Roussanova, A., Enya, K., Yoshi, Y., Shporer, A., Mazeh, T., Johnson, J. A., Narita, N., & Suto, Y. (2007). The transit light curve project. v. system parameters and stellar rotation period of HD 189733. Astronomical Journal, 133(4), 1828-1835. https://doi.org/10.1086/512159