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

Journal Article · Fri Jul 01 00:00:00 EDT 2011 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/735/1/24· OSTI ID:21576564

Johnson, John Asher; Morton, T D ^[1]; Winn, J N ^[2]; Bakos, G A; Hartman, J D; Torres, G; Latham, D W; Noyes, R W; Esquerdo, G A; Furesz, G; Quinn, S N; Beky, B; Sasselov, D D; Stefanik, R P ^[3]; Kovacs, Geza ^[4]; Sato, B ^[5]; Fischer, D A ^[6]; Marcy, G W; Howard, A W ^[7]

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1. California Institute of Technology, Department of Astrophysics, MC 249-17, Pasadena, CA 91125 (United States)
2. Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139 (United States)
3. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
4. Konkoly Observatory, Budapest (Hungary)
5. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551 (Japan)
6. Department of Astronomy, Yale University, New Haven, CT (United States)
7. Department of Astronomy, University of California, Berkeley, CA (United States)

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 T{sub c} = 2455456.46561 {+-} 0.00037 (BJD), and transit duration 0.0887 {+-} 0.0015 days. The host star has a mass of 1.24 {+-} 0.04 M{sub sun}, radius of 1.21 {+-} 0.05 R{sub sun}, effective temperature of 6304 {+-} 88 K, and metallicity [Fe/H] = +0.13 {+-} 0.08. The planetary companion has a mass of 0.711 {+-} 0.028 M{sub J} and radius of 1.340 {+-} 0.065 R{sub J} yielding a mean density of 0.37 {+-} 0.05 g cm{sup -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 {lambda} = 73.{sup 0}5 {+-} 9.{sup 0}0 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{sub eff*} {approx}> 6250 K.

• OSTI ID: 21576564
• Journal Information: Astrophysical Journal, Vol. 735, Issue 1; Other Information: DOI: 10.1088/0004-637X/735/1/24; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
DWARF STARS
ORBITS
PLANETS
RADIAL VELOCITY
STARS
VELOCITY