Details

Autor(en) / Beteiligte

• Mandushev, Georgi
• O’Donovan, Francis T
• Charbonneau, David
• Torres, Guillermo
• Latham, David W
• Bakos, Gáspár Á
• Dunham, Edward W
• Sozzetti, Alessandro
• Fernández, José M
• Esquerdo, Gilbert A
• Everett, Mark E
• Brown, Timothy M
• Rabus, Markus
• Belmonte, Juan A
• Hillenbrand, Lynne A

Titel

TrES-4: A Transiting Hot Jupiter of Very Low Density

Ist Teil von

• The Astrophysical journal, 2007-10, Vol.667 (2), p.L195-L198

Ort / Verlag

Chicago, IL: IOP Publishing

Erscheinungsjahr

2007

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We report the discovery of TrES-4, a hot Jupiter that transits the star GSC 02620-00648 every 3.55 days. From high-resolution spectroscopy of the star, we estimate a stellar effective temperature of [unk] = 6100 plus or minus 150 K, and from high-precision z and B photometry of the transit we constrain the ratio of the semimajor axis a and the stellar radius [unk] to be [unk] = 6.03 plus or minus 0.13. We compare these values to model stellar isochrones to constrain the stellar mass to be [unk] = 1.22 plus or minus 0.17M sub( )[unk]. Based on this estimate and the photometric time series, we constrain the stellar radius to be [unk] = 1.738 plus or minus 0.092R sub( )[unk] and the planet radius to be R sub(p) = 1.674 plus or minus 0.094R sub(Jup). We model our radial velocity data assuming a circular orbit and find a planetary mass of 0.84 plus or minus 0.10M sub(Jup). Our radial velocity observations rule out line-bisector variations that would indicate a specious detection resulting from a blend of an eclipsing binary system. TrES-4 has the largest radius and lowest density of any of the known transiting planets. It presents a challenge to current models of the physical structure of hot Jupiters and indicates that the diversity of physical properties among the members of this class of exoplanets has yet to be fully explored.