Bibcode
Lalitha, S.; Baroch, D.; Morales, J. C.; Passegger, V. M.; Bauer, F. F.; Cardona Guillén, C.; Dreizler, S.; Oshagh, M.; Reiners, A.; Ribas, I.; Caballero, J. A.; Quirrenbach, A.; Amado, P. J.; Béjar, V. J. S.; Colomé, J.; Cortés-Contreras, M.; Galadí-Enríquez, D.; González-Cuesta, L.; Guenther, E. W.; Hagen, H.-J.; Henning, T.; Herrero, E.; Husser, T.-O.; Jeffers, S. V.; Kaminski, A.; Kürster, M.; Lafarga, M.; Lodieu, N.; López-González, M. J.; Montes, D.; Perger, M.; Rosich, A.; Rodríguez, E.; Rodríguez-López, C.; Schmitt, J. H. M. M.; Tal-Or, L.; Zechmeister, M.
Bibliographical reference
Astronomy and Astrophysics, Volume 627, id.A116, 21 pp.
Advertised on:
7
2019
Journal
Citations
16
Refereed citations
14
Description
Although M dwarfs are known for high levels of stellar activity, they
are ideal targets for the search of low-mass exoplanets with the radial
velocity (RV) method. We report the discovery of a planetary-mass
companion around LSPM J2116+0234 (M3.0 V) and confirm the existence of a
planet orbiting GJ 686 (BD+18 3421; M1.0 V). The discovery of the planet
around LSPM J2116+0234 is based on CARMENES RV observations in the
visual and near-infrared channels. We confirm the planet orbiting around
GJ 686 by analyzing the RV data spanning over two decades of
observationsfrom CARMENES VIS, HARPS-N, HARPS, and HIRES. We find
planetary signals at 14.44 and 15.53 d in the RV data for LSPM
J2116+0234 and GJ 686, respectively. Additionally, the RV, photometric
time series, and various spectroscopic indicators show hints of
variations of 42 d for LSPM J2116+0234 and 37 d for GJ 686, which we
attribute to the stellar rotation periods. The orbital parameters of the
planets are modeled with Keplerian fits together with correlated noise
from the stellar activity. A mini-Neptune with a minimum mass of 11.8
M⊕ orbits LSPM J2116+0234 producing a RV semi-amplitude
of 6.19 m s-1, while a super-Earth of mass 6.6
M⊕ orbits GJ 686 and produces a RV semi-amplitude of
3.0 m s-1. Both LSPM J2116+0234 and GJ 686 have planetary
companions populating the regime of exoplanets with masses lower than 15
M⊕ and orbital periods <20 d.
Table A.1 and A.2 are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/627/A116
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