The transit light curve project. I. Four consecutive transits of the exoplanet XO-1b

Matthew J. Holman, Joshua N. Winn, David W. Latham, Francis T. O'Donovan, David Charbonneau, Gáspár A. Bakos, Gilbert A. Esquerdo, Carl Hergenrother, Mark E. Everett, P. Á L. András

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152 Citations (Scopus)

Abstract

We present RIz photometry of four consecutive transits of the newly discovered exoplanet XO-1b. We improve on the estimates of the transit parameters, finding the planetary radius to be RP = 1.184 -0.018+0.028 RJ, and the stellar radius to be R* = 0.928-0.013+0.018 R, assuming a stellar mass of M* = (1.00 ± 0.03) M⊙. The uncertainties in the planetary and stellar radii are dominated by the uncertainty in the stellar mass. These uncertainties increase by a factor of 2-3 if a more conservative uncertainty of 0.10 M is assumed for the stellar mass. Our estimate of the planetary radius is smaller than that reported by McCullough and coworkers, and the resulting estimate for the mean density of XO-1b is intermediate between that of the low-density planet HD 209458b and the higher density planets TrES-1 and HD 189733b. The timings of the transits have an accuracy ranging from 0.2 to 2.5 minutes and are marginally consistent with a uniform period.

Original languageEnglish
Pages (from-to)1715-1723
Number of pages9
JournalAstrophysical Journal
Volume652
Issue number2 I
DOIs
Publication statusPublished - Dec 1 2006

Keywords

  • Planetary systems
  • Stars: individual (GSC 02041-01657)
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Holman, M. J., Winn, J. N., Latham, D. W., O'Donovan, F. T., Charbonneau, D., Bakos, G. A., Esquerdo, G. A., Hergenrother, C., Everett, M. E., & András, P. Á. L. (2006). The transit light curve project. I. Four consecutive transits of the exoplanet XO-1b. Astrophysical Journal, 652(2 I), 1715-1723. https://doi.org/10.1086/508155