The transit light curve project. XII. Six transits of the exoplanet XO-2b

Jose M. Fernandez, Matthew J. Holman, Joshua N. Winn, Guillermo Torres, Avi Shporer, Tsevi Mazeh, Gilbert A. Esquerdo, Mark E. Everett

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


We present photometry of six transits of the exoplanet XO-2b. By combining the light-curve analysis with theoretical isochrones to determine the stellar properties, we find the planetary radius to be 0.996-0.018 +0.031 RJup and the planetary mass to be 0.565 ± 0.054 MJup. These results are consistent with those reported previously, and are also consistent with theoretical models for gas giant planets. The midtransit times are accurate to within 1 minute and are consistent with a constant period. However, the period we derive differs by 2.5σ from the previously published period. More data are needed to tell whether the period is actually variable (as it would be in the presence of an additional body) or if the timing errors have been underestimated.

Original languageEnglish (US)
Pages (from-to)4911-4916
Number of pages6
JournalAstronomical Journal
Issue number6
StatePublished - Jun 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • planetary systems
  • stars: individual (XO-2, GSC 03413-00005)


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