Two temperate sub-Neptunes transiting the star EPIC 212737443
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We report the validation of a new planetary system around the K3 star EPIC 212737443 using a combination of K2 photometry, follow-up high-resolution imaging and spectroscopy. The system consists of two sub-Neptune sized transiting planets with radii of 2.6R⊕ and 2.7R⊕, with orbital periods of 13.6 and 65.5 d, equilibrium temperatures of 536 and 316 K, respectively. In the context of validated K2 systems, the outer planet has the longest precisely measured orbital period, as well as the lowest equilibrium temperature for a planet orbiting a star of spectral type earlier than M. The two planets in this system have a mutual Hill radius of ΔRH = 36, larger than most other known transiting multiplanet systems, suggesting the existence of another (possibly non-transiting) planet, or that the system is not maximally packed.
Herath , M , Hinse , T C , Livingston , J H , Hernández , J , Evans , D F , Wells , R , Gunesekera , S , Tregloan-Reed , J , Rabus , M , Skottfelt , J , Dominik , M , Jørgensen , U G , Jayaratne , C & Lý , C T K 2019 , ' Two temperate sub-Neptunes transiting the star EPIC 212737443 ' , Monthly Notices of the Royal Astronomical Society , vol. 488 , no. 1 , pp. 536–546 . https://doi.org/10.1093/mnras/stz1641
Monthly Notices of the Royal Astronomical Society
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with the publisher's policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stz1641
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