HAT-P-30b: A TRANSITING HOT JUPITER ON A HIGHLY OBLIQUE ORBIT

• Main Authors: Johnson, John Asher (Author), Winn, Joshua Nathan (Contributor), Bakos, Gaspar A. (Author), Hartman, Joel D. (Author), Morton, Timothy D. (Author), Torres, G. (Author), Kovacs, Geza (Author), Latham, David W. (Author), Noyes, Robert W. (Author), Sato, B. (Author), Esquerdo, G. A. (Author), Fisher, D. A. (Author), Marcy, Geoffrey W. (Author), Howard, Andrew W. (Author), Buchhave, Lars A. (Author), Furesz, Gabor (Author), Quinn, S. N. (Author), Beky, B. (Author), Sasselov, D. D. (Author), Stefanik, R. P. (Author), Lazar, J. (Author), Papp, I. (Author), Sari, P. (Author)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), MIT Kavli Institute for Astrophysics and Space Research (Contributor)
• Format: Article
• Language: English
• Published: Institute of Physics Publishing, 2012-08-29T15:17:51Z.
• Subjects: Article
• Online Access: Get fulltext

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 [plus-minus] 0.000005 days, transit epoch T[subscript c] = 2455456.46561 [plus-minus] 0.00037 (BJD), and transit duration 0.0887 [plus-minus] 0.0015 days. The host star has a mass of 1.24 ± 0.04 M ⊙, radius of 1.21 [plus-minus] 0.05 R ⊙, effective temperature of 6304 [plus-minus] 88 K, and metallicity [Fe/H] = +0.13 [plus-minus] 0.08. The planetary companion has a mass of 0.711 [plus-minus] 0.028 M[subscript J] and radius of 1.340 [plus-minus] 0.065 R[subscript J] yielding a mean density of 0.37 [plus-minus] 0.05 g cm[superscript -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 = 73fdg5 [plus-minus] 9fdg0 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[subscript eff*] gsim 6250 K.
United States. National Aeronautics and Space Administration (NASA grant NNX09AF59G)
United States. National Aeronautics and Space Administration (Kepler Mission under NASA Cooperative Agreement NCC2-1390)
Hungarian Scientific Research Foundation (grant K-81373)