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 min and do not depart significantly from a constant period.
@article{arxiv.0707.1908,
title = {The Transit Light Curve Project. VII. The Not-So-Bloated Exoplanet HAT-P-1b},
author = {Joshua N. Winn and Matthew J. Holman and Gaspar A. Bakos and Andras Pal and John Asher Johnson and Peter K. G. Williams and Avi Shporer and Tsevi Mazeh and Jose Fernandez and David W. Latham and Michael Gillon},
journal= {arXiv preprint arXiv:0707.1908},
year = {2009}
}
Comments
To appear in AJ [19pg, 3 figures]. New co-author added. Minor revisions to match published version