The CARMENES search for exoplanets around M dwarfs: The warm super-Earths in twin orbits around the mid-type M dwarfs Ross 1020 (GJ 3779) and LP 819-052 (GJ 1265)

We announce the discovery of two planetary companions orbiting around the low-mass stars Ross 1020 (GJ 3779, M4.0V) and LP 819-052 (GJ 1265, M4.5V). The discovery is based on the analysis of CARMENES radial velocity (RV) observations in the visual channel as part of its survey for exoplanets around...

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Detalles Bibliográficos
Autores: Luque, Rafael, Nowak, G., Pallé, Enric, Kossakowski, D., Trifonov, T., Zechmeister, Mathias, Béjar, Victor J. S., Guillén, C. C., Tal-Or, Lev, Hidalgo, D., Ribas, Ignasi, Reiners, Ansgar, Caballero, J. A., Amado, Pedro J., Quirrenbach, Andreas, Aceituno, Jesús, Cortés-Contreras, M., Díez-Alonso, E., Dreizler, Stefan, Guenther, E. W., Henning, Thomas, Jeffers, Sandra V., Kaminski, Adrian, Kürster, M., Lafarga, M., Montes, David, Morales, Juan Carlos, Passegger, V.M., Schmitt, Jürgen H. M. M., Schweitzer, Andreas
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/212040
Acceso en línea:http://hdl.handle.net/10261/212040
Access Level:acceso abierto
Palabra clave:Planetary systems
Stars: late-type
Stars: low-mass
Techniques: radial velocities
Descripción
Sumario:We announce the discovery of two planetary companions orbiting around the low-mass stars Ross 1020 (GJ 3779, M4.0V) and LP 819-052 (GJ 1265, M4.5V). The discovery is based on the analysis of CARMENES radial velocity (RV) observations in the visual channel as part of its survey for exoplanets around M dwarfs. In the case of GJ 1265, CARMENES observations were complemented with publicly available Doppler measurements from HARPS. The datasets reveal two planetary companions, one for each star, that share very similar properties: minimum masses of 8.0 ± 0.5 M and 7.4 ± 0.5 M in low-eccentricity orbits with periods of 3.023 ± 0.001 d and 3.651 ± 0.001 d for GJ 3779 b and GJ 1265 b, respectively. The periodic signals around 3 d found in the RV data have no counterpart in any spectral activity indicator. Furthermore, we collected available photometric data for the two host stars, which confirm that the additional Doppler variations found at periods of approximately 95 d can be attributed to the rotation of the stars. The addition of these planets to a mass-period diagram of known planets around M dwarfs suggests a bimodal distribution with a lack of short-period low-mass planets in the range of 2-5 M . It also indicates that super-Earths (>5 M ) currently detected by RV and transit techniques around M stars are usually found in systems dominated by a single planet.© ESO 2018.

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