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The CARMENES search for exoplanets around M dwarfs: High-resolution optical and near-infrared spectroscopy of 324 survey stars

AuthorsReiners, A.; Zechmeister, M.; Caballero, J. A.; Ribas, I.; Morales, J. C.; Jeffers, S. V.; Schöfer, P.; Tal-Or, L.; Quirrenbach, A.; Amado, Pedro J. ; Kaminski, A.; Laun, W.; Hermelo, I.; Hernández Arabí, R.; Baroch, D.; Reinhart, S.; Hernández Castaño, L.; Hernández Hernando, F.; Herrero, E.; Montes, D.; Trifonov, T.; Tala, M.; Kim, M.; Klein, R.; Klüter, J.; Lemke, U.; Panduro, J.; Redondo, P.; Klutsch, A.; Kürster, M.; Pedraz, S.; Aceituno, J.; Rhode, P.; Moreno-Raya, M. E.; Lafarga, M.; Winkler, J.; Marfil, E.; Lenzen, R.; Sanz-Forcada, J.; Pérez-Calpena, A.; Launhardt, R.; Sánchez-Blanco, E.; López Del Fresno, M.; Rix, H.-W.; Rebolo, R.; López-González, M. J.; Moya, A.; López-Puertas, Manuel ; López Salas, J. F.; Marvin, C. J.; Pascual Granado, J.; López-Santiago, J.; Luque, R.; Mathar, R. J.; Hauschildt, P. H.; Pérez Medialdea, D.; Sánchez Carrasco, M. A.; Xu, W.; Strachan, J. B. P.; Seifert, W.; Mundt, R.; Nagel, E.; Ferro, I. M.; Azzaro, M.; Sánchez-López, A.; Rodler, F.; Perger, M.; Naranjo, V.; Reffert, S.; Nortmann, L.; Nowak, G.; Ofir, A.; Oreiro, R.; Pallé, E.; Abril, Miguel ; Zapatero Osorio, M. R.; Rodríguez Martínez, Eloy ; Passegger, V. M.; Pavlov, A.; Vico Linares, J. I.; Martín-Ruiz, Susana ; Perryman, M. A. C.; Pluto, M.; Huber, A.; Rabaza, O.; Ramón, A.; Antona, R.; Rodríguez-López, Cristina ; Claret dos Santos, Antonio ; Barrado, D.; Suárez, J. C.; Feiz, C.; Johnson, E. N.; Rodríguez Trinidad, A.; Sarkis, P.; Alonso-Floriano, F. J.; Colomé, J.; Díez-Alonso, E.; Rohloff, R.-R.;; Rosich, A.; Sadegi, S.; Wagner, K.; Bauer, F. F.; Grözinger, U.; Fernández, Matilde ; Cortés-Contreras, M.; Sarmiento, L. F.; Schäfer, S.; Hatzes, A. P.; Galadí-Enríquez, D.; Ammler-Von Eiff, M.; Schmitt, J. H. M. M.; Schiller, J.; Schweitzer, A.; Ulbrich, R. G.; Solano, E.; Becerril, S.; Stahl, O.; Anglada-Escudé, G.; Tulloch, S. M.; Czesla, S.; Cifuentes, C.; Anwand-Heerwart, H.; Maroto Fernández, D.; Arroyo-Torres, B.; Grohnert, S.; Wolthoff, V.; Fuhrmeister, B.; Béjar, V. J. S.; Huke, P.; Juan, E. D.; Lamert, A.; Benítez, D.; Veredas, G.; Berdinas, Z. M.; Bergond, G.; Guàrdia, J.; Blümcke, M.; Brinkmöller, M.; Martín, E. L.; Del Burgo, C.; Cano, J.; Cárdenas Vázquez, María Concepción ; Casal, E.; Yan, F.; Dreizler, S.; Tabernero, H. M.; Lara, Luisa María ; Garcia-Piquer, A.; García Vargas, M. L.; Magán Madinabeitia, H.; Mall, U.; Lampón, M.;; Gesa, L.; Hedrosa, R. P.; Galera, V. G.; González Hernández, J. I.; Marín Molina, J. A.; Guenther, E. W.; González-Peinado, R.; Mancini, L.; Helmling, J.; Guijarro, A.; Stürmer, J.; Guindos, E. D.; Gutiérrez-Soto, J. ; Hagen, H.-J.; Mirabet, E.; Vilardell, F.; Mandel, H.; Henning, T.
Infrared: stars
Stars: late-type
Stars: low-mass
Stars: rotation
Issue Date2018
PublisherEDP Sciences
CitationAstronomy and Astrophysics 612: A49 (2018)
AbstractThe CARMENES radial velocity (RV) survey is observing 324 M dwarfs to search for any orbiting planets. In this paper, we present the survey sample by publishing one CARMENES spectrum for each M dwarf. These spectra cover the wavelength range 520¿1710 nm at a resolution of at least R >80 000, and we measure its RV, H¿ emission, and projected rotation velocity. We present an atlas of high-resolution M-dwarf spectra and compare the spectra to atmospheric models. To quantify the RV precision that can be achieved in low-mass stars over the CARMENES wavelength range, we analyze our empirical information on the RV precision from more than 6500 observations. We compare our high-resolution M-dwarf spectra to atmospheric models where we determine the spectroscopic RV information content, Q, and signal-to-noise ratio. We find that for all M-type dwarfs, the highest RV precision can be reached in the wavelength range 700¿900 nm. Observations at longer wavelengths are equally precise only at the very latest spectral types (M8 and M9). We demonstrate that in this spectroscopic range, the large amount of absorption features compensates for the intrinsic faintness of an M7 star. To reach an RV precision of 1 m s¿1 in very low mass M dwarfs at longer wavelengths likely requires the use of a 10 m class telescope. For spectral types M6 and earlier, the combination of a red visual and a near-infrared spectrograph is ideal to search for low-mass planets and to distinguish between planets and stellar variability. At a 4 m class telescope, an instrument like CARMENES has the potential to push the RV precision well below the typical jitter level of 3-4 m s-1. © ESO 2018.
Publisher version (URL)http://dx.doi.org/10.1051/0004-6361/201732054
Identifiersdoi: 10.1051/0004-6361/201732054
issn: 0004-6361
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