Información del autor
Autor Caballero, J. A. |
Documentos disponibles escritos por este autor (34)
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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
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
Ivanov, M. V. ; Megías, G. D. ; González Jiménez, R. ; Moreno, O. ; Bárbaro, M. B. ; Caballero, J. A. ; Donnelly, T. W. ; Antonov, A. N. ; Moya de Guerra, Elvira ; Udías Moinelo, José Manuel | Amer Inst Physics | 2016SuperScaling model (SuSA) predictions to neutrino-induced charged-current pi(+) production in the Delta-resonance region are explored under MiniBooNE experimental conditions. The SuSA charged-current pi(+) results are in good agreement with data[...]texto impreso
Ultra-hot Jupiters (UHJs) are highly irradiated giant exoplanets with extremely high day-side temperatures, which lead to thermal dissociation of most of the molecular species. It is expected that the neutral hydrogen atom is one of the main spe[...]texto impreso
Megías, G. D. ; Ivanov, M. V. ; González Jiménez, R. ; Caballero, J. A. ; Bárbaro, M. B. ; Donnelly, T. W. ; Udías Moinelo, José Manuel | Amer Physical Soc | 2015-02-11texto impreso
Caballero, J. A. ; Cornide Castro-Piñeiro, Manuel ; Castro Rubio, Elisa de | Wiley-VCH Verlag GmbH | 2010-03We look for high-amplitude variable young stars in the open clusters and associations of the Orion Belt. We use public data from the ASAS-3 Photometric V -band Catalogue of the All Sky Automated Survey, infrared photometry from the 2MASS and IRA[...]texto impreso
Sanz Forcada, J. ; Caballero, J. A. ; Labarga Ávalos, F. ; Montes Gutiérrez, David | EDP Sciencies | 2019-09Context. Recently, the He I triplet at 10 830 Å was rediscovered as an excellent probe of the extended and possibly evaporating atmospheres of close-in transiting planets. This has already resulted in detections of this triplet in the atmosphere[...]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
Caballero, J. A. ; Valdivielso, L. ; Martín, E. L. ; Montes Gutiérrez, David ; Pascual, S. ; Pérez González, Pablo Guillermo | EDP Sciencies | 2008-11Aims. We study in detail nine sources in the direction of the young ? Orionis cluster, which is considered to be a unique site for studying stellar and substellar formation. The nine sources were selected because of their peculiar properties, su[...]texto impreso
Context. HD 209458 b is an exoplanet with an upper atmosphere undergoing blow-off escape that has mainly been studied using measurements of the Ly? absorption. Recently, high-resolution measurements of absorption in the He I triplet line at 10 8[...]texto impreso
Ivanov, M. V. ; Antonov, A. N. ; Bárbaro, M. B. ; Giusti, C. ; Meucci, A. ; Caballero, J. A. ; González Jiménez, A. ; Moya de Guerra, Elvira ; Udías Moinelo, José Manuel | Amer Physical Soc | 2015-03-12Neutral current quasielastic ( anti) neutrino scattering cross sections on a C-12 target are analyzed using a realistic spectral function S( p, E) that gives a scaling function in accordance with the ( e, e') scattering data. The spectral functi[...]texto impreso
Ivanov, M. V. ; Antonov, A. N. ; Megías, G. D. ; González-Jiménez, R. ; Bárbaro, M. B. ; Caballero, J. A. ; Donnelly, T. W. ; Udías Moinelo, José Manuel | IOP publishing ltd | 2018We compare the characteristics of the charged-current quasielastic (anti)neutrino scattering obtained in two different nuclear models, the phenomenological SuperScaling Approximation and the model using a realistic spectral function S(p, epsilon[...]texto impreso
Simón Díaz, S. ; Caballero, J. A. ; Lorenzo, J. ; Maíz Apellániz, J. ; Schneider, F. R. N. ; Negueruela, I. ; Barbá, R. H. ; Dorda, R. ; Marco, A. ; Montes Gutiérrez, David ; Pellerin, A. ; Sánchez Bermúdez, J. ; Sódor, A. ; Sota, A. | IOP Publishing | 2015-02-01We provide a complete characterization of the astrophysical properties of the sigma Ori Aa, Ab, B hierarchical triple system and an improved set of orbital parameters for the highly eccentric sigma Ori Aa, Ab spectroscopic binary. We compiled a [...]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)[...]texto impreso
Alonso Floriano, F. J. ; Caballero, J. A. ; Cortés Contreras, Miriam ; Solano, E. ; Montes Gutiérrez, David | EDP Sciencies | 2015-11Aims. We look for common proper motion companions to stars of the nearby young ??Pictoris moving group. Methods. First, we compiled a list of 185 ??Pictoris members and candidate members from 35 representative works. Next, we used the Aladin and[...]texto impreso
Ivanov, M. V ; Antonov, A. N. ; Megías, G. D. ; Caballero, J. A. ; Bárbaro, M. B. ; Amaro, J. E. ; Ruiz Simo, I. ; Donnelly, T. W. ; Udías Moinelo, José Manuel | American Physical Society | 2019-01-10A detailed study of charged current quasielastic neutrino and antineutrino scattering cross sections on a C-12 target with no pions in the final state is presented. The initial nucleus is described by means of a realistic spectral function S(p, [...]texto impreso
Caballero, J. A. ; Cabrera Lavers, A. ; García Álvarez, D ; Pascual Ramírez, Sergio | EDP Sciencies | 2012-10Context. Although many studies have been performed so far, there are still dozens of low-mass stars and brown dwarfs in the young ? Orionis open cluster without detailed spectroscopic characterisation. Aims. We look for unknown strong accretors [...]texto impreso
Caballero, J. A. ; Burgos, A. de ; Alonso Floriano, F.J. ; Cabrera Lavers, A. ; García Álvarez, D. ; Montes Gutiérrez, David | EDP Sciencies | 2019-09Context. Only a few open clusters are as important for the study of stellar and substellar objects, and their formation and evolution, as the young ? Orionis cluster. However, a complete spectroscopic characterisation of its whole stellar popula[...]texto impreso
The search for Earth-like planets around late-type stars using ultrastable spectrographs requires a very precise characterization of the stellar activity and the magnetic cycle of the star, since these phenomena induce radial velocity (RV) signa[...]texto impreso
Gómez Marfil, Emilio ; Tabernero, H.M. ; Montes Gutiérrez, David ; Caballero, J. A. ; Soto, M.G. ; González Hernández, J. I. ; Kaminski, A. ; Nagel, E. ; Jeffers, S.V. ; Reiners, A. ; Ribas, I. ; Quirrenbach, A. ; Amado, P.J. | Oxford University Press. | 2020-03With the purpose of assessing classic spectroscopic methods on high-resolution and high signal-to-noise ratio spectra in the near-infrared wavelength region, we selected a sample of 65 F-, G-, and K-type stars observed with CARMENES, the new, ul[...]texto impreso
Superscaling in electron-nucleus scattering and its link to CC and NC QE neutrino-nucleus scattering
Bárbaro, M. B. ; Amaro, J. E. ; Caballero, J. A. ; Donnelly, T. W. ; González Jiménez, R. ; Ivanov, M. ; Udías Moinelo, José Manuel | Amer Inst Physics | 2015The superscaling approach (SuSA) to neutrino-nucleus scattering, based on the assumed universality of the scaling function for electromagnetic and weak interactions, is reviewed. The predictions of the SuSA model for bot CC and NC differential a[...]texto impreso
Caballero, J. A. ; Cortés Contreras, Miriam ; Díez Alonso, Enrique ; Domínguez Fernández, A.J. ; Montes Gutiérrez, David | EDP Sciencies | 2020-04-07Context. The nearby ultra-compact multiplanetary system YZ Ceti consists of at least three planets, and a fourth tentative signal. The orbital period of each planet is the subject of discussion in the literature due to strong aliasing in the rad[...]texto impreso
Although M dwarfs are known for high levels of stellar activity, they are ideal targets for the search of low-mass exoplanets with the radial velocity (RV) method. We report the discovery of a planetary-mass companion around LSPM J2116+0234 (M3.[...]texto impreso
Schweitzer, A. ; Passegger, V.M: ; Cifuentes, C. ; Béjar, V.J.S. ; Cortés Contreras, Miriam ; Caballero, J. A. ; Burgo, C. del ; Czesla, S. ; Kürster, M. ; Montes, D. ; Zapatero Osorio, M.R. ; Ribas, I. ; Reiners, A. ; Quirrenbach, A. ; Amado, P.J. ; Aceituno, J. ; Anglada Escudé, G. ; Bauer, F.F. ; Dreizler, S. ; Jeffers, S.V. ; Guenther, E.W. ; Henning, T. ; Kaminski, A. ; Lafarga, M. ; Marfil, E. ; Morales, J.C. ; Schmitt, J.H.M.M. ; Seifert, W. ; Solano, E. ; Tabernero, H.M. ; Zechmeister, M. | EDP SCIENCES S A | 2019-05Aims. We determine the radii and masses of 293 nearby, bright M dwarfs of the CARMENES survey. This is the first time that such a large and homogeneous high-resolution (R > 80, 000) spectroscopic survey has been used to derive these fundamental[...]texto impreso
Caballero, J. A. ; Cortés Contreras, Miriam ; Domínguez Fernández, A.J. ; Montes Gutiérrez, David | EDP Sciencies | 2020-02-04We have corrected an error in Passegger et al. (2019) in the calculation of the stellar surface gravity log g from literature masses and radii provided by Gaidos & Mann (2014) and Mann et al. (2015).texto impreso
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 [...]texto impreso
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[...]texto impreso
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[...]texto impreso
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[...]texto impreso
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[...]texto impreso
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 [...]texto impreso
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[...]texto impreso
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[...]texto impreso
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 [...]