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Autor Caballero, J. A. |
Documentos disponibles escritos por este autor (34)
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Caballero, J. A. ; Cortés Contreras, Miriam ; Domínguez Fernández, A.J. ; Montes Gutiérrez, David | EDP Sciencies | 2019-07-17We present precise photospheric parameters of 282 M dwarfs determined from fitting the most recent version of PHOENIX models to high-resolution CARMENES spectra in the visible (0.52–0.96 µm) and NIR wavelength range (0.96–1.71 µm). With its aim [...]![]()
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Context. For years, the standard procedure to measure radial velocities (RVs) of spectral observations consisted in cross-correlating the spectra with a binary mask, that is, a simple stellar template that contains information on the position an[...]![]()
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The CARMENES search for exoplanets around M dwarfs A super-Earth planet orbiting HD 79211 (GJ 338 B)
Aims. We report on radial velocity time series for two M0.0 V stars, GJ 338 B and GJ 338 A, using the CARMENES spectrograph, complemented by ground-telescope photometry from Las Cumbres and Sierra Nevada observatories. We aim to explore the pres[...]![]()
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Sanz Forcada, J. ; Caballero, J. A. ; Cortés Contreras, Miriam ; Montes Gutiérrez, David | EDP Sciencies | 2019-11-25The He I infrared (IR) triplet at 10 830 Å is an important activity indicator for the Sun and in solar-type stars, however, it has rarely been studied in relation to M dwarfs to date. In this study, we use the time-averaged spectra of 319 single[...]![]()
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We announce the discovery of two planets orbiting the M dwarfs GJ 251 (0.360 ± 0.015 M?) and HD 238090 (0.578 ± 0.021 M?) based on CARMENES radial velocity (RV) data. In addition, we independently confirm with CARMENES data the existence of Lala[...]![]()
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We present the discovery and characterisation of two transiting planets observed by the Transiting Exoplanet Survey Satellite (TESS) orbiting the nearby (d* ? 22 pc), bright (J ? 9 mag) M3.5 dwarf LTT 3780 (TOI–732). We confirm both planets and [...]![]()
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Caballero, J. A. ; Montes Gutiérrez, David ; Klutsch, A. ; Genebriera, J. ; Miret, F. X. ; Tobal, T. ; Cairol, J. ; Pedraz, S. | EDP Sciencies | 2010-09Aims. We investigated in detail the system WDS 19312+3607, whose primary is an active M4.5Ve star previously inferred to be young (? ~ 300–500?Ma) based on its high X-ray luminosity. Methods. We collected intermediate- and low-resolution optical[...]![]()
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Caballero, J. A. ; López Santiago, Javier ; Castro Rubio, Elisa de ; Cornide Castro-Piñeiro, Manuel | IOP publishing ltd | 2009-01We used the Aladin Virtual Observatory tool and High Resolution Imager ROSAT archival data to search for X-ray variability in scale of days in 23 young stars in the ? Orionis cluster and a background galaxy. Five stars displayed unambiguous flar[...]![]()
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Caballero, J. A. ; López Santiago, J. ; Castro Rubio, Elisa de ; Cornide Castro-Piñeiro, Manuel | IOP publishing ltd | 2009-06We used the Aladin Virtual Observatory tool and High Resolution Imager ROSAT archival data to search for X-ray variability in scale of days in 23 young stars in the sigma Orionis cluster and a background galaxy. Five stars displayed unambiguous [...]