Two temperate sub-Neptunes transiting the star EPIC 212737443

Mahesh Herath, Tobias C. Hinse, John H. Livingston, Jesús Hernández, Daniel F. Evans, Robert Wells, Saraj Gunesekera, Jeremy Tregloan-Reed, Markus Rabus, Jesper Skottfelt, Martin Dominik, Uffe G. Jørgensen, Chandana Jayaratne, Cuc T. K. Lý

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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 and 65.5 d, equilibrium temperatures of 536 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 multiplanet systems, suggesting the existence of another (possibly non-transiting) planet, or that the system is not maximally packed.
Original languageEnglish
Pages (from-to)536–546
JournalMonthly Notices of the Royal Astronomical Society
Volume488
Issue number1
Early online date14 Jun 2019
DOIs
Publication statusPublished - Sept 2019

Keywords

  • Techniques: photometric
  • Techniques: spectroscopic
  • eclipses
  • Planets and satellites: detection

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