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Two temperate sub-Neptunes transiting the star EPIC 212737443

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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 ?RH = 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.

Acceptance Date Jun 14, 2019
Publication Date Jun 14, 2019
Publicly Available Date Mar 28, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Pages 536-546
DOI https://doi.org/10.1093/mnras/stz1641
Keywords techniques, photometric, techniques, spectroscopic, eclipses; planets, satellites, detection
Publisher URL https://doi.org/10.1093/mnras/stz1641

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