Herath, M, Hinse, TC, Livingston, JH, Hernández, J, Evans, DF, Wells, R, Gunesekera, S, Tregloan-Reed, J, Rabus, M, Skottfelt, J, Dominik, M, Jørgensen, UG, Jayaratne, C and Lý, CTK (2019) Two temperate sub-Neptunes transiting the star EPIC 212737443. Monthly Notices of the Royal Astronomical Society, 488 (4). pp. 536-546. ISSN 1365-2966

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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: Article
Additional Information: This is the final published version of the article (version of record). It first appeared online via Oxford University Press at https://doi.org/10.1093/mnras/stz1641 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: techniques, photometric, techniques, spectroscopic, eclipses; planets, satellites, detection
Subjects: Q Science > QB Astronomy > QB600 Planets. Planetology
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 21 Jun 2019 08:18
Last Modified: 04 Oct 2019 10:58
URI: https://eprints.keele.ac.uk/id/eprint/6516

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