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Warm Giant Planet in an Eccentric Orbit

3 Jul 2014, 22:00 UTC
Warm Giant Planet in an Eccentric Orbit
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Nearly all giant planets discovered to date have orbital periods either less than ~10 days (i.e. the hot-Jupiters) or more than ~100 days (i.e. like Jupiter). Only a few giant planets are known to have orbital periods between 10 to 100 days. A. Santerne et al. (2014) report on the discovery of KOI-1257b, a warm giant planet in a highly eccentric 86.6 day orbit around one of two stars in a binary system. KOI-1257b’s orbit is such that it periodically transits its host star. Its discovery serves as an important addition to a list comprising of just a handful transiting giant planets with orbital periods greater than one month - HD80606 b (111 day period); CoRoT-9 b (95 day period); Kepler-30 c (60 day period) and Kepler-87 b (115 day period).KOI-1257b was first detected by NASA's Kepler space telescope as the planet periodically passes in front of its host star and causes the apparent brightness of its host star to dip by a small amount. The amount of dimming allows the size of KOI-1257b to be estimated at 0.94 ± 0.12 times Jupiter's radius. Subsequently, radial velocity observations were made using the SOPHIE and HARPS-N spectrographs to measure the amount ...

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