HAT-P-10b: A light and moderately hot Jupiter transiting A K dwarf

G. Á Bakos, A. Pál, G. Torres, B. Sipcz, D. W. Latham, R. W. Noyes, Géza Kovács, J. Hartman, G. A. Esquerdo, D. A. Fischer, J. A. Johnson, G. W. Marcy, R. P. Butler, A. W. Howard, D. D. Sasselov, Gábor Kovács, R. P. Stefanik, J. Lázár, I. Papp, P. Sári

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45 Scopus citations


We report on the discovery of HAT-P-10b, one of the lowest mass (0.487 ± 0.018M J) transiting extrasolar planets (TEPs) discovered to date by transit searches. HAT-P-10b orbits the moderately bright V = 11.89 K dwarf GSC 02340-01714, with a period P = 3.7224747 ± 0.0000065 days, transit epoch Tc = 2454759.68683 ± 0.00016 (BJD), and duration 0.1090 ± 0.0008days. HAT-P-10b has a radius of 1.005+0.032 -0.027R J yielding a mean density of 0.594 ± 0.052g cm-3. Comparing these observations with recent theoretical models we find that HAT-P-10b is consistent with a 4.5 Gyr, almost pure hydrogen and helium gas giant planet with a 10M core. With an equilibrium temperature of T eq = 1020 ± 17 K, HAT-P-10b is one of the coldest TEPs. Curiously, its Safronov number θ = 0.053 ± 0.002 falls close to the dividing line between the two suggested TEP populations.

Original languageEnglish (US)
Pages (from-to)1950-1955
Number of pages6
JournalAstrophysical Journal
Issue number2
StatePublished - May 10 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • planetary systems
  • stars: individual (HAT-P-10, GSC 02340-01714)
  • techniques: photometric
  • techniques: spectroscopic


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