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Title

The CARMENES search for exoplanets around M dwarfs: First visual-channel radial-velocity measurements and orbital parameter updates of seven M-dwarf planetary systems

AuthorsTrifonov, T.; Kürster, M.; Zechmeister, M.; Tal-Or, L.; Caballero, J.A.; Quirrenbach, A.; Amado, Pedro J. ; Ribas, I.; Reiners, A.; Reffert, S.; Dreizler, S.; Kaminski, A.; Launhardt, R.; Henning, T.; Nowak, G.; Montes, D.; Béjar, V.J.S.; Mundt, R.; Pavlov, A.; Schmitt, J.H.M.M.; Seifert, W.; Barrado, D.; Morales, J.C.; Jeffers, S.V.; Del Burgo, C.; Anglada-Escudé, G.; López-Santiago, J.; Mathar, R.J.; Ammler-Von Eiff, M.; Guenther, E.W.; Abril, Miguel ; González Hernández, J.I.; Arroyo-Torres, B.; Mancini, L.; Bauer, F.F.; Stürmer, J.; Aceituno, J.; Alonso-Floriano, F.J.; Antona, R.; Anwand-Heerwart, H.; Cano, J.; Azzaro, M.; Baroch, D.; Becerril, S.; Benítez, D.; Berdiñas, Z. M.; Bergond, G.; Blümcke, M.; Martín-Ruiz, Susana ; Cárdenas Vázquez, María Concepción ; Ferro, I.M.; Casal, E.; Cifuentes, C.; Gómez Galera, V.; Claret dos Santos, Antonio ; Colomé, J.; Cortés-Contreras, M.; Díez-Alonso, E.; Guàrdia, J.; Fernández, Matilde ; Lara, Luisa María ; Galadí-Enríquez, D.; Garcia-Piquer, A.; Gesa, L.; González-Peinado, R.; López-Puertas, Manuel ; Guijarro, A.; De Guindos, E.; Gutiérrez-Soto, J. ; Hedrosa, R.P.; Klutsch, A.; Helmling, J.; Hermelo, I.; Hernández Arabí, R.; Hernández Castaño, L.; Lampón, M.; Hernández Hernando, F.; Herrero, E.; De Juan, E.; Pascual Granado, J.; Lafarga, M.; López-González, M. J.; López Del Fresno, M.; López Salas, J.F.; Magán Madinabeitia, H.; Marfil, E.; Marín Molina, J.A.; Oreiro, R.; Maroto Fernández, D.; Martín, E.L.; Mirabet, E.; Pallé, E.; Rabaza, O.; Moya, A.; Moreno-Raya, M.E.; Nortmann, L.; Rodríguez-López, Cristina ; Pedraz, S.; Pérez Medialdea, D.; Perger, M.; Ramón, A.; Rebolo, R.; Redondo, P.; Reinhardt, S.; Solano, E.; Rodríguez Martínez, Eloy ; Sanz-Forcada, J.; Rodríguez Trinidad, A.; Rosich, A.; Sánchez-Blanco, E.; Sánchez Carrasco, M.A.; Hatzes, A.P.; Sánchez-López, A.; Suárez, J. C.; Tabernero, H.M.; Tulloch, S.M.; Vico Linares, J.I.; Vilardell, F.; Zapatero Osorio, M.R.
KeywordsPlanetary systems
Planets and satellites: dynamical evolution and stability
Stars: late-type
Stars: low-mass
Issue Date2018
PublisherEDP Sciences
CitationAstronomy and Astrophysics 609: A117 (2018)
AbstractContext. The main goal of the CARMENES survey is to find Earth-mass planets around nearby M-dwarf stars. Seven M dwarfs included in the CARMENES sample had been observed before with HIRES and HARPS and either were reported to have one short period planetary companion (GJ 15 A, GJ 176, GJ 436, GJ 536 and GJ 1148) or are multiple planetary systems (GJ 581 and GJ 876). Aims. We aim to report new precise optical radial velocity measurements for these planet hosts and test the overall capabilities of CARMENES. Methods. We combined our CARMENES precise Doppler measurements with those available from HIRES and HARPS and derived new orbital parameters for the systems. Bona-fide single planet systems were fitted with a Keplerian model. The multiple planet systems were analyzed using a self-consistent dynamical model and their best fit orbits were tested for long-term stability. Results. We confirm or provide supportive arguments for planets around all the investigated stars except for GJ 15 A, for which we find that the post-discovery HIRES data and our CARMENES data do not show a signal at 11.4 days. Although we cannot confirm the super-Earth planet GJ 15 Ab, we show evidence for a possible long-period (P = 7030 d) Saturn-mass (msini = 51.8M) planet around GJ 15 A. In addition, based on our CARMENES and HIRES data we discover a second planet around GJ 1148, for which we estimate a period P = 532.6 days, eccentricity e = 0.342 and minimum mass msini = 68.1M. Conclusions. The CARMENES optical radial velocities have similar precision and overall scatter when compared to the Doppler measurements conducted with HARPS and HIRES. We conclude that CARMENES is an instrument that is up to the challenge of discovering rocky planets around low-mass stars.© ESO, 2018.
DescriptionThe appendix tables are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/609/A117
Publisher version (URL)http://dx.doi.org/10.1051/0004-6361/201731442
URIhttp://hdl.handle.net/10261/209322
Identifiersdoi: 10.1051/0004-6361/201731442
issn: 1432-0746
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