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
Pages (from-to)866-877
Number of pages12
JournalAstrophysical Journal
Issue number2
Publication statusPublished - Dec 1 2010



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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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