Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 480, Issue 1, Pages L1-L5Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/sly102
Keywords
techniques: photometric; techniques: spectroscopic; planets and satellites: detection; stars: low mass; stars: individual: K2-239, K2-240
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Funding
- Spanish ministry project [AYA2017-89121-P, MINECO AYA2014-56359-P]
- SpanishMinistry of Economy and Competitiveness (MINECO) [MINECO RYC-2013-14875]
- Swiss National Science Foundation (SNSF)
- MINECO/FEDER [AYA2015-65887-P]
- Spanish MINECO [RYC-2013-13256]
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We present two new planetary systems found around cool dwarf stars with data from the K2 mission. The first system was found in K2-239 (EPIC 248545986), characterized in this work as M3.0V and observed in the 14th campaign of K2. It consists of three Earth-sized transiting planets with radii of 1.1, 1.0, and 1.1 R-circle plus, showing a compact configuration with orbital periods of 5.24, 7.78, and 10.1 d, close to 2:3:4 resonances. 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 R-circle plus and orbital periods of 6.03 and 20.5 d. 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 similar to 10 ppm.
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