HAT-P-17b,c: A TRANSITING, ECCENTRIC, HOT SATURN AND A LONG-PERIOD, COLD JUPITER

Journal Article · Fri Apr 20 00:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/749/2/134· OSTI ID:22020395

Howard, A W; Marcy, G W ^[1]; Bakos, G A; Hartman, J; Torres, G; Latham, D W; Noyes, R W; Esquerdo, G A; Beky, B; Sasselov, D D; Stefanik, R P; Perumpilly, G ^[2]; Shporer, A ^[3]; Mazeh, T ^[4]; Kovacs, Geza ^[5]; Fischer, D A ^[6]; Johnson, J A ^[7]; Butler, R P ^[8]; Lazar, J; Papp, I ^[9] ; others, and

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1. Department of Astronomy, University of California, Berkeley, CA (United States)
2. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
3. LCOGT, 6740 Cortona Drive, Santa Barbara, CA (United States)
4. School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978 (Israel)
5. Konkoly Observatory, Budapest (Hungary)
6. Astronomy Department, Yale University, New Haven, CT (United States)
7. California Institute of Technology, Department of Astrophysics, MC 249-17, Pasadena, CA (United States)
8. Department of Terrestrial Magnetism, Carnegie Institute of Washington, DC (United States)
9. Hungarian Astronomical Association, Budapest (Hungary)

We report the discovery of HAT-P-17b,c, a multi-planet system with an inner transiting planet in a short-period, eccentric orbit and an outer planet in a 4.4 yr, nearly circular orbit. The inner planet, HAT-P-17b, transits the bright V = 10.54 early K dwarf star GSC 2717-00417, with an orbital period P = 10.338523 {+-} 0.000009 days, orbital eccentricity e = 0.342 {+-} 0.006, transit epoch T{sub c} = 2454801.16943 {+-} 0.00020 (BJD: barycentric Julian dates throughout the paper are calculated from Coordinated Universal Time (UTC)), and transit duration 0.1690 {+-} 0.0009 days. HAT-P-17b has a mass of 0.534 {+-} 0.018 M{sub J} and radius of 1.010 {+-} 0.029 R{sub J} yielding a mean density of 0.64 {+-} 0.05 g cm{sup -3}. This planet has a relatively low equilibrium temperature in the range 780-927 K, making it an attractive target for follow-up spectroscopic studies. The outer planet, HAT-P-17c, has a significantly longer orbital period P{sub 2} = 1610 {+-} 20 days and a minimum mass m{sub 2}sin i{sub 2} = 1.31{sup +0.18}{sub -0.15} M{sub J}. The orbital inclination of HAT-P-17c is unknown as transits have not been observed and may not be present. The host star has a mass of 0.86 {+-} 0.04 M{sub Sun }, radius of 0.84 {+-} 0.02 R{sub Sun }, effective temperature 5246 {+-} 80 K, and metallicity [Fe/H] = 0.00 {+-} 0.08. HAT-P-17 is the second multi-planet system detected from ground-based transit surveys.

• OSTI ID: 22020395
• Journal Information: Astrophysical Journal, Vol. 749, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
DWARF STARS
INCLINATION
JUPITER PLANET
MASS
ORBITS
SATURN PLANET