A pair of temperate sub-Neptunes transiting the star EPIC 212737443

Herath, Mahesh; Hinse, Tobias C; Livingston, John H; Hernández, Jesús; Evans, Daniel F; Wells, Robert; Gunesekera, Saraj; Tregloan-Reed, Jeremy; Rabus, Markus; Skottfelt, Jesper; Dominik, Martin; Jørgensen, Uffe G; Jayaratne, Chandana and Lý, Cuc T K (2019). A pair of temperate sub-Neptunes transiting the star EPIC 212737443. Monthly Notices of the Royal Astronomical Society, 488(1) pp. 536–546.

DOI: https://doi.org/10.1093/mnras/stz1641

Abstract

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 days and 65.5 days, equilibrium temperatures of 536 K 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 multi-planet systems, suggesting the existence of another (possibly non-transiting) planet, or that the system is not maximally packed.

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