Kepler-730 - A new WASP-47-like analogue? Super-Earth interior to hot Jupiter

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Kepler-730 - A new WASP-47-like analogue? Super-Earth interior to hot Jupiter

Post by Sirius_Alpha on 4th September 2018, 10:17 pm

Kepler-730b is probably a hot Jupiter with a small companion

Here we draw attention to a candidate system with one hot Jupiter and one small, nearby companion, revealed by the recent Kepler data release (DR25). The hot Jupiter, Kepler-730b, has radius Rp=11.36+1.14−0.98 R⊕ and orbital period P=6.492 d, and the newly discovered companion, KOI-929.02, has Rp=1.45+0.15−0.20 R⊕ and P=2.852 d. No transit timing variation (TTV) was detected because of the marginal detection of the small companion transit, but this small companion passed all the validation tests. This system is probably another planetary system with hot Jupiter and small, nearby companion, after the outstanding WASP-47 system, and so far the only such system (out of 46) in the prime Kepler mission. The nature of this system, if confirmed, would suggest that hot Jupiters with small, nearby companions are probably more common than we used to believe. There remains a possibility that the small companion actually transits a star that is different from the hot Jupiter host, and follow-up observations with 10-m telescopes can potentially resolve this issue.

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