HAT-P-13b,c: A TRANSITING HOT JUPITER WITH A MASSIVE OUTER COMPANION ON AN ECCENTRIC ORBIT

Journal Article · Thu Dec 10 00:00:00 EST 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/707/1/446· OSTI ID:21389265

Bakos, G A; Noyes, R W; Hartman, J; Torres, G; Latham, D W; Sasselov, D D; Stefanik, R P; Sipocz, B; Kovacs, Gabor; Esquerdo, G A; Pal, A ^[1]; Howard, A W; Marcy, G W ^[2]; Kovacs, Geza ^[3]; Fischer, D A ^[4]; Johnson, J A ^[5]; Lazar, J; Papp, I; Sari, P ^[6]

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1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
2. Department of Astronomy, University of California, Berkeley, CA (United States)
3. Konkoly Observatory, Budapest (Hungary)
4. Department of Physics and Astronomy, San Francisco State University, San Francisco, CA (United States)
5. Institute for Astronomy, University of Hawaii, Honolulu, HI 96822 (United States)
6. Hungarian Astronomical Association, Budapest (Hungary)

We report on the discovery of a planetary system with a close-in transiting hot Jupiter on a near circular orbit and a massive outer planet on a highly eccentric orbit. The inner planet, HAT-P-13b, transits the bright V = 10.622 G4 dwarf star GSC 3416 - 00543 every P = 2.916260 +- 0.000010 days, with transit epoch T{sub c} = 2454779.92979 +- 0.00038 (BJD) and duration 0.1345 +- 0.0017 days. The outer planet HAT-P-13c orbits the star every P {sub 2} = 428.5 +- 3.0 days with a nominal transit center (assuming zero impact parameter) of T {sub 2c} = 2454870.4 +- 1.8 (BJD) or time of periastron passage T {sub 2,peri} = 2454890.05 +- 0.48 (BJD). Transits of the outer planet have not been observed, and may not be present. The host star has a mass of 1.22{sup +0.05} {sub -0.10} M {sub sun}, radius of 1.56 +- 0.08 R {sub sun}, effective temperature of 5653 +- 90 K, and is rather metal-rich with [Fe/H] = +0.41 +- 0.08. The inner planetary companion has a mass of 0.853{sup +0.029} {sub -0.046} M {sub J}, and radius of 1.281 +- 0.079 R {sub J}, yielding a mean density of 0.498{sup +0.103} {sub -0.069} g cm{sup -3}. The outer companion has m {sub 2}sin i {sub 2} = 15.2 +- 1.0 M {sub J}, and orbits on a highly eccentric orbit of e {sub 2} = 0.691 +- 0.018. While we have not detected significant transit timing variations of HAT-P-13b, due to gravitational and light-travel time effects, future observations will constrain the orbital inclination of HAT-P-13c, along with its mutual inclination to HAT-P-13b. The HAT-P-13 (b, c) double-planet system may prove extremely valuable for theoretical studies of the formation and dynamics of planetary systems.

• OSTI ID: 21389265
• Journal Information: Astrophysical Journal, Vol. 707, Issue 1; Other Information: DOI: 10.1088/0004-637X/707/1/446; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
DWARF STARS
IMPACT PARAMETER
INCLINATION
JUPITER PLANET
MASS
ORBITS
VISIBLE RADIATION
ELECTROMAGNETIC RADIATION
PLANETS
RADIATIONS
STARS