HAT-P-15b: A 10.9 day extrasolar planet transiting a solar-type star

G. Kovács, G. Á Bakos, J. D. Hartman, G. Torres, R. W. Noyes, D. W. Latham, A. W. Howard, D. A. Fischer, J. A. Johnson, G. W. Marcy, H. Isaacson, D. D. Sasselov, R. P. Stefanik, G. A. Esquerdo, J. M. Fernandez, B. Béky J. Lázár, I. Papp, P. Sári

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We report the discovery of HAT-P-15b, a transiting extrasolar planet in the "period valley," a relatively sparsely populated period regime of the known extrasolar planets. The host star, GSC 2883-01687, is a G5 dwarf with V = 12.16. It has amass of 1.01 ±0.04 Mȯ, radius of 1.08 ±0.04 Rȯ, effective temperature 5568 ± 90 K, and metallicity [Fe/H] = +0.22 ± 0.08. The planetary companion orbits the star with a period P = 10.863502 ± 0.000027 days, transit epoch T c = 2454638.56019 ± 0.00048 (BJD), and transit duration 0.2285 ± 0.0015 days. It has a mass of 1.946 ± 0.066 MJ and radius of 1.072 ± 0.043 RJ yielding a mean density of 1.96 ± 0.22 gcm-3. At an age of 6.8+2.5-1.6 Gyr, the planet is H/He-dominated and theoretical models require about 2% (10 M ) worth of heavy elements to reproduce its measured radius. With an estimated equilibrium temperature of ∼820 K during transit, and ∼1000 K at occultation, HAT-P-15b is a potential candidate to study moderately cool planetary atmospheres by transmission and occultation spectroscopy.

Original languageEnglish (US)
Pages (from-to)866-877
Number of pages12
JournalAstrophysical Journal
Issue number2
StatePublished - Dec 1 2010

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Planetary systems
  • Stars: individual (HAT-P-15)
  • Techniques: photometric
  • Techniques: spectroscopic

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    Kovács, G., Bakos, G. Á., Hartman, J. D., Torres, G., Noyes, R. W., Latham, D. W., Howard, A. W., Fischer, D. A., Johnson, J. A., Marcy, G. W., Isaacson, H., Sasselov, D. D., Stefanik, R. P., Esquerdo, G. A., Fernandez, J. M., Lázár, B. B. J., Papp, I., & Sári, P. (2010). HAT-P-15b: A 10.9 day extrasolar planet transiting a solar-type star. Astrophysical Journal, 724(2), 866-877. https://doi.org/10.1088/0004-637X/724/2/866