The Transit Light Curve Project. VII. The Not-So-Bloated Exoplanet HAT-P-1b

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

Abstract

We present photometry of the G0 star HAT-P-1 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.

Additional Information

© 2007 American Astronomical Society. Received 2007 June 13; accepted 2007 July 12. We thank Debra Fischer and Geoff Marcy for helpful discussions and John Southworth for his publicly available code for finding limb-darkening parameters. A. P. is grateful for the hospitality of the Harvard-Smithsonian Center for Astrophysics, where some of this work was carried out. M. J. H. acknowledges support for this work from NASA Origins grant NG06GH69G. G. Á. B. was supported by NASA through Hubble Fellowship Grant HST-HF-01170.01. P. K. G.W. was supported by an NSF Graduate Student Research Fellowship. KeplerCam was developed with partial support from the Kepler Mission under NASA Cooperative Agreement NCC2-1390 (PI:D. Latham), and the KeplerCam observations described in this paper were partly supported by grants from the Kepler Mission to SAO and PSI.

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