HAT-P-15b: A 10.9 DAY EXTRASOLAR PLANET TRANSITING A SOLAR-TYPE STAR

Journal Article · Wed Dec 01 00:00:00 EST 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/724/2/866· OSTI ID:21474510

Kovacs, G ^[1]; Bakos, G A; Hartman, J D; Torres, G; Noyes, R W; Latham, D W; Sasselov, D D; Stefanik, R P; Esquerdo, G A; Fernandez, J M ^[2]; Howard, A W; Marcy, G W; Isaacson, H ^[3]; Fischer, D A ^[4]; Johnson, J A ^[5]; Lazar, B Beky J.; Papp, I; Sari, P ^[6]

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1. Konkoly Observatory, Budapest (Hungary)
2. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
3. Department of Astronomy, University of California, Berkeley, CA (United States)
4. Department of Astronomy, Yale University, New Haven, CT 06511 (United States)
5. California Institute of Technology, Department of Astrophysics, MC 249-17, Pasadena, CA (United States)
6. Hungarian Astronomical Association, Budapest (Hungary)

We report the discovery of HAT-P-15b, a transiting extrasolar planet in the 'period valley', a relatively sparsely populated period regime of the known extrasolar planets. The host star, GSC 2883-01687, is a G5 dwarf with V= 12.16. It has a mass of 1.01 {+-} 0.04 M{sub sun}, radius of 1.08 {+-} 0.04 R{sub sun}, effective temperature 5568 {+-} 90 K, and metallicity [Fe/H] = +0.22 {+-} 0.08. The planetary companion orbits the star with a period P = 10.863502 {+-} 0.000027 days, transit epoch T{sub c} = 2454638.56019 {+-} 0.00048 (BJD), and transit duration 0.2285 {+-} 0.0015 days. It has a mass of 1.946 {+-} 0.066 M{sub J} and radius of 1.072 {+-} 0.043 R{sub J} yielding a mean density of 1.96 {+-} 0.22 g cm{sup -3}. At an age of 6.8{sup +2.5}{sub -1.6} Gyr, the planet is H/He-dominated and theoretical models require about 2% (10 M{sub +}) worth of heavy elements to reproduce its measured radius. With an estimated equilibrium temperature of {approx}820 K during transit, and {approx}1000 K at occultation, HAT-P-15b is a potential candidate to study moderately cool planetary atmospheres by transmission and occultation spectroscopy.

• OSTI ID: 21474510
• Journal Information: Astrophysical Journal, Vol. 724, Issue 2; Other Information: DOI: 10.1088/0004-637X/724/2/866; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ECLIPSE
MASS
ORBITS
PLANETARY ATMOSPHERES
PLANETS
SPECTROSCOPY
STARS
ATMOSPHERES