HAT-P-14b: A 2.2M J exoplanet transiting a bright F star

G. Torres, G. Á Bakos, J. Hartman, Géza Kovcs, R. W. Noyes, D. W. Latham, D. A. Fischer, J. A. Johnson, G. W. Marcy, A. W. Howard, D. D. Sasselov, D. Kipping, B. Sipcz, R. P. Stefanik, G. A. Esquerdo, M. E. Everett, J. Lázár, I. Papp, P. Sári

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Abstract

We report the discovery of HAT-P-14b, a fairly massive transiting extrasolar planet orbiting the moderately bright star GSC 3086-00152 (V = 9.98), with a period of P = 4.627669 0.000005days. The transit is close to grazing (impact parameter 0.891+0.007 -0.008) and has a duration of 0.0912 0.0017days, with a reference epoch of mid-transit of Tc = 2, 454, 875.28938 ± 0.00047 (BJD). The orbit is slightly eccentric (e = 0.107 ± 0.013), and the orientation is such that occultations are unlikely to occur. The host star is a slightly evolved mid-F dwarf with a mass of 1.386 ± 0.045M , a radius of 1.468 ± 0.054R , effective temperature 6600 ± 90K, and a slightly metal-rich composition corresponding to [Fe/H] = +0.11 0.08. The planet has a mass of 2.232 ± 0.059M J and a radius of 1.150 ± 0.052R J, implying a mean density of 1.82 ± 0.24g cm-3. Its radius is well reproduced by theoretical models for the 1.3Gyr age of the system if the planet has a heavy-element fraction of about 50M (7% of its total mass). The brightness, near-grazing orientation, and other properties of HAT-P-14 make it a favorable transiting system to look for changes in the orbital elements or transit timing variations induced by a possible second planet, and also to place meaningful constraints on the presence of sub-Earth mass or Earth-mass exomoons, by monitoring it for transit duration variations.

Original languageEnglish
Pages (from-to)458-467
Number of pages10
JournalAstrophysical Journal
Volume715
Issue number1
DOIs
Publication statusPublished - Jan 1 2010

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ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Torres, G., Bakos, G. Á., Hartman, J., Kovcs, G., Noyes, R. W., Latham, D. W., Fischer, D. A., Johnson, J. A., Marcy, G. W., Howard, A. W., Sasselov, D. D., Kipping, D., Sipcz, B., Stefanik, R. P., Esquerdo, G. A., Everett, M. E., Lázár, J., Papp, I., & Sári, P. (2010). HAT-P-14b: A 2.2M J exoplanet transiting a bright F star. Astrophysical Journal, 715(1), 458-467. https://doi.org/10.1088/0004-637X/715/1/458