G. Torres et al 2007 ApJ 666 L121 doi:10.1086/521792
HAT-P-3b: A Heavy-Element-rich Planet Transiting a K Dwarf Star
FREE ISSUEG. Torres1, G. Á. Bakos1,2, G. Kovács3, D. W. Latham1, J. M. Fernández1, R. W. Noyes1, G. A. Esquerdo1, A. Sozzetti1,4, D. A. Fischer5, R. P. Butler6, G. W. Marcy7, R. P. Stefanik1, D. D. Sasselov1, J. Lázár8, I. Papp8 and P. Sári8
Show affiliationsWe report the discovery of a Jupiter-size planet transiting a relatively bright (V = 11.56) and metal-rich early K dwarf star with a period of ~2.9 days. On the basis of follow-up photometry and spectroscopy we determine the mass and radius of the planet, HAT-P-3b, to be Mp = 0.599 ± 0.026 MJup and Rp = 0.890 ± 0.046 RJup. The relatively small size of the object for its mass implies the presence of about 75 M⊕ worth of heavy elements (~
of the total mass) based on current theories of irradiated extrasolar giant planets, similar to the mass of the core inferred for the transiting planet HD 149026b. The bulk density of HAT-P-3b is found to be ρp = 1.06 ± 0.17 g cm-3, and the planet orbits the star at a distance of 0.03894 AU. Ephemerides for the transit centers are Tc = 2,454,218.7594 ± 0.0029 + N × (2.899703 ± 0.000054) (HJD).
- Subject headings
binaries: spectroscopic; planetary systems; stars: fundamental parameters; stars: individual (HAT-P-3); techniques: spectroscopic
- Dates
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Issue 2 (2007 September 10)
Received 2007 June 14, accepted for publication 2007 July 23
Published 2007 August 17
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HAT-P-3b: A Heavy-Element-rich Planet Transiting a K Dwarf Star
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