Ministerio de Ciencia, Innovación y Universidades Gobierno de Canarias Universidad de La Laguna CSIC Centro de Excelencia Severo Ochoa

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Two planetary systems with transiting Earth-size and super-Earth planets orbiting late-type dwarf stars

Author/s: E. Díez Alonso, J. I. González Hernández, S. L. Suárez Gómez et al.

Reference: 2018 MNRAS 480 L1 | Link

Phase-folded light curves corresponding to Earth-size planets b (top), c (middle), and d (bottom) in the K2-239 system. Solid curves represent best model fits obtained by MCMC.
Phase-folded light curves corresponding to Earth-size planets b (top), c (middle), and d (bottom) in the K2-239 system. Solid curves represent best model fits obtained by MCMC.

We present two new planetary systems found around cool dwarf stars with data from the K2 mission. The first system was found in K2-329 (EPIC 248545986), characterized in this work as M3.0V and observed in the 14th campaign of K2. It consists of three Earth-size transiting planets with radii of 1.1, 1.0 and 1.1 Earth radii, showing a compact configuration with orbital periods of 5.24, 7.78 and 10.1 days, close to 2:3:4 resonance. The second was found in K2-240 (EPIC 249801827), characterized in this work as M0.5V and observed in the 15th campaign. It consists of two transiting super-Earths with radii 2.0 and 1.8 Earth radii and orbital periods of 6.03 and 20.5 days. The equilibrium temperatures of the atmospheres of these planets are estimated to be in the range of 380-600 K and the amplitudes of signals in transmission spectroscopy are estimated at ~ 10 ppm.

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