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) A pair of temperate sub-Neptunes transiting the star EPIC 212737443. Monthly Notices of the Royal Astronomical Society.

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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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2019 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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: 21 Jun 2019 08:19
URI: http://eprints.keele.ac.uk/id/eprint/6516

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