The transit light curve project. VII. The not-so-bloated exoplanet hAT-P-1b

Joshua N. Winn, Matthew J. Holman, Gaspar Á Bakos, András Pál, John Asher Johnson, Peter K.G. Williams, Shporer Avi, Tsevi Mazeh, José Fernandez, David W. Latham, Michael Gillon

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


We present photometry of the GO star HAT-P-I during six transits of its close-in giant planet, and we refine the estimates of the system parameters. Relative to Jupiter's properties, HAT-P-1b is 1.20 ±0.05 times larger, and its surface gravity is 2.7 ±0.2 times weaker. Although it remains the case that HAT-P-1b is among the least dense of the known sample of transiting exoplanets, its properties are in accord with previously published models of strongly irradiated, coreless, solar-composition giant planets. The times of the transits have a typical accuracy of 1 minute and do not depart significantly from a constant period.

Original languageEnglish (US)
Pages (from-to)1707-1712
Number of pages6
JournalAstronomical Journal
Issue number4
StatePublished - 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Planetary systems
  • Stars: individual (HAT-P-1, ADS 16402B)


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