2018MNRAS.480L...1D

Query : 2018MNRAS.480L...1D

2018MNRAS.480L...1D - Mon. Not. R. Astron. Soc., 480, L1-L5 (2018/October-2)

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

DIEZ ALONSO E., GONZALEZ HERNANDEZ J.I., SUAREZ GOMEZ S.L., AGUADO D.S., GONZALEZ GUTIERREZ C., SUAREZ MASCARENO A., CABRERA-LAVERS A., GONZALEZ-NUEVO J., TOLEDO-PADRON B., GRACIA J., DE COS JUEZ F.J. and REBOLO R.

Abstract (from CDS):

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⊕, 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⊕ 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 ∼10 ppm.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: photometric - techniques: spectroscopic - planets and satellites: detection - stars: low mass - stars: individual: (K2-239, K2-240)

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 K2-239 * 10 42 22.6342566960 +04 26 28.885936560   16.21 14.55 14.14   M3V 24 0
2 K2-239b Pl 10 42 22.6342566960 +04 26 28.885936560           ~ 13 0
3 K2-239c Pl 10 42 22.6342566960 +04 26 28.885936560           ~ 14 0
4 K2-239d Pl 10 42 22.6342566960 +04 26 28.885936560           ~ 14 0
5 K2-240 PM* 15 11 23.9071822656 -17 52 30.795194136   14.849 13.392 12.969   M0-5V 26 0
6 K2-240b Pl 15 11 23.9071822656 -17 52 30.795194136           ~ 7 0
7 K2-240c Pl 15 11 23.9071822656 -17 52 30.795194136           ~ 9 0

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