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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.

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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 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.

Item Type: Journal Item
Copyright Holders: 2019 The Authors
ISSN: 1365-2966
Keywords: planets and satellites: detection; techniques: photometric; techniques: spectroscopic; eclipses; individual: EPIC 212737443
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 62119
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 24 Jun 2019 08:45
Last Modified: 28 Sep 2019 21:01
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