HAT-P-30b: A transiting hot jupiter on a highly oblique orbit

John Asher Johnson, J. N. Winn, G. A. Bakos, J. D. Hartman, T. D. Morton, G. Torres, Géza Kovács, D. W. Latham, R. W. Noyes, B. Sato, G. A. Esquerdo, D. A. Fischer, G. W. Marcy, A. W. Howard, L. A. Buchhave, G. Frész, S. N. Quinn, B. Béky, D. D. Sasselov, R. P. StefanikJ. Lázár, I. Papp, P. Sári

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59 Scopus citations


We report the discovery of HAT-P-30b, a transiting exoplanet orbiting the V = 10.419 dwarf star GSC 0208-00722. The planet has a period P = 2.810595 ± 0.000005 days, transit epoch Tc = 2455456.46561 ± 0.00037 (BJD), and transit duration 0.0887 ± 0.0015days. The host star has a mass of 1.24 ± 0.04M , radius of 1.21 ± 0.05R , effective temperature of 6304 ± 88K, and metallicity [Fe/H] = +0.13 ± 0.08. The planetary companion has a mass of 0.711 ± 0.028M J and radius of 1.340 ± 0.065R J yielding a mean density of 0.37 ± 0.05g cm-3. We also present radial velocity measurements that were obtained throughout a transit that exhibit the Rossiter-McLaughlin effect. By modeling this effect, we measure an angle of λ = 735 ± 90 between the sky projections of the planet's orbit normal and the star's spin axis. HAT-P-30b represents another example of a close-in planet on a highly tilted orbit, and conforms to the previously noted pattern that tilted orbits are more common around stars with T eff ≳ 6250K.

Original languageEnglish (US)
Article number24
JournalAstrophysical Journal
Issue number1
StatePublished - Jul 1 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • planetary systems
  • stars: individual (HAT-P-30, GSC 0208-00722)


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