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Montes Gutiérrez, David ; González Peinado, R. ; Tabernero, H. M. ; Caballero, J. A. ; Gómez Marfil, Emilio ; Alonso Floriano, F. J. ; Cortés Contreras, Miriam ; González Hernández, J. I. ; Klutsch, A. ; Moreno Jodar, C. | Oxford Univ Press | 2018-09We investigated almost 500 stars distributed among 193 binary or multiple systems made of late-E, G-, or earl y-K-primaries and late-K- or M-dwarf companion candidates, For all of them, we compiled or measured coordinates, J-band magnitudes, spe[...]texto impreso
Cortés Contreras, Miriam ; Montes Gutiérrez, David ; otros, ... | Nature Publishing Group | 2018-11-15Barnard's star is a red dwarf, and has the largest proper motion (apparent motion across the sky) of all known stars. At a distance of 1.8 parsecs(1), it is the closest single star to the Sun; only the three stars in the alpha Centauri system ar[...]texto impreso
Alonso Floriano, F.J. ; Cortés Contreras, Miriam ; López Santiago, Javier ; Montes Gutiérrez, David | Spie-Int Soc Optical Engineering | 2016CARMENES, the new Calar Alto spectrograph especially built for radial-velocity surveys of exoearths around M dwarfs, is a very complicated system. For reaching the goal of 1 m/s radial-velocity accuracy, it is appropriate not only to monitor sta[...]texto impreso
Alonso Floriano, F. J. ; Morales, J. C. ; Caballero, J. A. ; Montes Gutiérrez, David ; Klutsch, A. ; Mundt, R. ; Cortés Contreras, Miriam ; Ribas, I. ; Reiners, A. ; Amado, P. J. ; Quirrenbach, A. ; Jeffers, S. V. | EDP Sciencies | 2015-05Context. CARMENES is a stabilised, high-resolution, double-channel spectrograph at the 3.5m Calar Alto telescope. It is optimally designed for radial-velocity surveys of M dwarfs with potentially habitable Earth-mass planets. Aims. We prepare a [...]texto impreso
Cortés Contreras, Miriam ; Montes Gutiérrez, David ; Alonso Floriano, F. J. ; otros, ... | EDP Sciencies | 2017-01Aims. We search for low-mass companions of M dwarfs and characterize their multiplicity fraction with the purpose of helping in the selection of the most appropriate targets for the CARMENES exoplanet survey. Methods. We obtained high-resolution[...]texto impreso
CARMENES is a spectrograph for radial velocity surveys of M dwarfs with the aim of detecting Earth-mass planets orbiting in the habitable zones of their host stars. To ensure an optimal use of the CARMENES guaranteed time observations, in this p[...]texto impreso
Cifuentes, C. ; Caballero, J.A. ; Cortés Contreras, Miriam ; Montes Gutiérrez, David ; Abellán, F.J. ; Dorda, R. ; Holgado, G. ; Zapatero Osorio, M.R. ; Morales, J.C. ; Amado, P.J. ; Passegger, V.M. ; Quirrenbach, A. ; Reiners, A. ; Ribas, I. ; Schweitzer, A. ; Sanz Forcada, J. ; Seifert, W. ; Solano, E. | EDP Sciencies | 2020-10-12Context. The relevance of M dwarfs in the search for potentially habitable Earth-sized planets has grown significantly in the last years. Aims. In our on-going effort to comprehensively and accurately characterise confirmed and potential planet-[...]texto impreso
Alonso Floriano, F. J. ; Cortés Contreras, Miriam ; González Álvarez, E. ; Hidalgo, D. ; Holgado, G. ; López Santiago, J. ; Martínez Rodríguez, H. ; Montes Gutiérrez, David ; Abellán de Paco, F. J. | SPIE, the international society for optics and photonics | 2014This paper gives an overview of the CARMENES instrument and of the survey that will be carried out with it during the first years of operation. CARMENES (Calar Alto high-Resolution search for M dwarfs with Exoearths with Near-infrared and optica[...]texto impreso
Las estrellas enanas de tipo M representan cerca de dos tercios de las estrellas en la Galaxia, lo que las convierte en objetivos perfectos para el estudio de formación y evolución estelar al final del diagrama Hertzsprung-Russell. El máximo de [...]texto impreso
Caballero, J.A. ; Sanz Forcada, J. ; Cortés Contreras, Miriam ; Montes Gutiérrez, David | EDP Science | 2018-12-07We present three transit observations of HD 189733 b obtained with the high-resolution spectrograph CARMENES at Calar Alto. A strong absorption signal is detected in the near-infrared He I triplet at 10830 Å in all three transits. During mid-tra[...]texto impreso
Context. Small planets around low-mass stars often show orbital periods in a range that corresponds to the temperate zones of their host stars which are therefore of prime interest for planet searches. Surface phenomena such as spots and faculae[...]texto impreso
High resolution transit spectroscopy has proven to be a reliable technique for the characterization of the chemical composition of exoplanet atmospheres. Taking advantage of the broad spectral coverage of the CARMENES spectrograph, we initiated [...]texto impreso
Ultra-hot Jupiters are emerging as a new class of exoplanets. Studying their chemical compositions and temperature structures will improve our understanding of their mass loss rate as well as their formation and evolution. We present the detecti[...]texto impreso
Context. M dwarfs are known to generate the strongest magnetic fields among main-sequence stars with convective envelopes, but we are still lacking a consistent picture of the link between the magnetic fields and underlying dynamo mechanisms, ro[...]texto impreso
Caballero, J. A. ; Cortés Contreras, Miriam ; Montes Gutiérrez, David | EDP SCIENCES S A | 2019-08-06We report the detection of a transiting Earth-size planet around GJ 357, a nearby M2.5 V star, using data from the Transiting Exoplanet Survey Satellite (TESS). GJ 357 b (TOI-562.01) is a transiting, hot, Earth-sized planet (T_(eq) = 525 ± 11 K)[...]
