J. López‐Santiago
A5062796801- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Atmospheric Ozone and Climate
- Adaptive optics and wavefront sensing
- Gaussian Processes and Bayesian Inference
- Spectroscopy and Laser Applications
- Target Tracking and Data Fusion in Sensor Networks
- Bayesian Methods and Mixture Models
- High-pressure geophysics and materials
- Galaxies: Formation, Evolution, Phenomena
- Statistical Methods and Inference
- Calibration and Measurement Techniques
- Blind Source Separation Techniques
- Mathematics, Computing, and Information Processing
- Fault Detection and Control Systems
- Statistical Methods and Bayesian Inference
- Crustacean biology and ecology
- Infrared Target Detection Methodologies
Universidad Carlos III de Madrid
2017-2024
Tecnológico Nacional de México
2024
Universidad Rey Juan Carlos
2023
Hospital General Universitario Gregorio Marañón
2019-2020
Universidad Complutense de Madrid
2009-2019
Instituto de Astrofísica de Andalucía
2018
University of Göttingen
2018
Institute of Space Sciences
2018
Osservatorio Astronomico di Palermo
2006-2009
Osservatorio Astrofisico di Catania
2009
This is the first paper of a series aimed at studying properties late-type members young stellar kinematic groups. We concentrate our study on classical moving groups such as Local Association (Pleiades group, , IC 2391 supercluster (35 Myr), Ursa Major group (Sirius supercluster, 300 and Hyades (600 well recently identified Castor (200 Myr). In this we compile preliminary list single possible some these Stars are selected from previously established based photometric candidates other...
This paper gives an overview of the CARMENES instrument and survey that will be carried out with it during first years operation. (Calar Alto high-Resolution search for M dwarfs Exoearths Near-infrared optical Echelle Spectrographs) is a next-generation radial-velocity under construction 3.5m telescope at Calar Observatory by consortium eleven Spanish German institutions. The scientific goal project conducting 600-night exoplanet targeting ~ 300 completed instrument. consists two separate...
The CARMENES radial velocity (RV) survey is observing 324 M dwarfs to search for any orbiting planets. In this paper, we present the sample by publishing one spectrum each dwarf. These spectra cover wavelength range 520--1710nm at a resolution of least $R > 80,000$, and measure its RV, H$\alpha$ emission, projected rotation velocity. We an atlas high-resolution M-dwarf compare atmospheric models. To quantify RV precision that can be achieved in low-mass stars over range, analyze our...
This is an up-to-date introduction to, and overview of, marginal likelihood computation for model selection hypothesis testing. Computing normalizing constants of probability models (or ratios constants) a fundamental issue in many applications statistics, applied mathematics, signal processing, machine learning. article provides comprehensive study the state art topic. We highlight limitations, benefits, connections, differences among different techniques. Problems possible solutions with...
The latest results in the research of forming planetary systems have led several authors to compile a sample candidates for searching planets vicinity Sun. Young stellar associations are indeed excellent laboratories this study, but some them not close enough allow detection through adaptive optics techniques. However, existence very young moving groups can solve problem. Here we compiled members nearest groups, as well list new from our catalog late-type stars that possible kinematic...
We systematically study the X-ray and ultraviolet emission of a subsample M dwarfs from recent proper-motion survey, selecting all within 10pc to obtain nearly volume-limited sample (~90% completeness). Archival ROSAT, XMM-Newton GALEX data are combined with published spectroscopic studies Halpha rotation broad picture stellar activity on dwarfs. make use synthetic model spectra determine relative contributions photospheric chromospheric flux. also analyse same diagnostics for comparison...
Context: The main goal of the CARMENES survey is to find Earth-mass planets around nearby M-dwarf stars. Seven M-dwarfs included in sample had been observed before with HIRES and HARPS either were reported have one short period planetary companion (GJ15A, GJ176, GJ436, GJ536 GJ1148) or are multiple systems (GJ581 GJ876). Aims: We aim report new precise optical radial velocity measurements for these planet hosts test overall capabilities CARMENES. Methods: combined our Doppler those available...
The CARMENES instrument is a pair of high-resolution (R⪆80,000) spectrographs covering the wavelength range from 0.52 to 1.71 μm, optimized for precise radial velocity measurements. It was installed and commissioned at 3.5m telescope Calar Alto observatory in Southern Spain 2015. first large science program survey ~ 300 M dwarfs, which started on Jan 1, 2016. We present an overview all subsystems (front end, fiber system, visible-light spectrograph, near-infrared calibration units, etalons,...
<i>Aims. <i/>We present a compilation of spectroscopic data from survey 144 chromospherically active young stars in the solar neighborhood, which may be used to investigate different aspects its formation and evolution terms kinematics stellar history. The have already been by us several studies. With this paper, we make all these accessible scientific community for future studies on topics.<i>Methods. performed observations with <i>echelle<i/> spectrographs cover entirety optical spectral...
We present a homogeneous study of chromospheric and coronal flux-flux relationships using sample 298 late-type dwarf active stars with spectral types F to M. The lines were observed simultaneously in each star avoid spread due long term variability. Unlike other works, we subtract the basal contribution all studied. For first time, quantify departure dMe from general relations. show that dK dKe also deviate trend. Studying flux-colour diagrams demonstrate deviating relations are those...
Testing whether close-in massive exoplanets (hot Jupiters) can enhance the stellar activity in their host primary is crucial for models of and planetary evolution. Among systems with hot Jupiters, HD 189733 one best studied because its proximity, strong activity, presence a transiting planet, which allows transmission spectroscopy measure radius density. Here we report on X-ray star, A, using new XMM-Newton observation comparison previous observations. The spectrum quiescent intervals...
CARMENES (Calar Alto high-Resolution search for M dwarfs with Exo-earths Near-infrared and optical Echelle Spectrographs) is a next-generation instrument the 3.5m telescope at Calar Observatory, built by consortium of eleven Spanish German institutions. The consists two separate échelle spectrographs covering wavelength range from 0.55 μm to 1.7 spectral resolution R = 82, 000, fed fibers Cassegrain focus telescope. Both are housed in temperature-stabilized vacuum tanks, enable long-term 1...
HD 209458b was the first transiting planet discovered, and for which an atmosphere, in particular NaI, detected. With time, it has become one of most frequently studied planets, with a large diversity atmospheric studies using low- high-resolution spectroscopy. Here, we present transit spectroscopy observations HARPS-N CARMENES spectrographs. We fit Rossiter-McLaughlin effect by combining radial velocity data from both instruments (nine transits total), measuring projected spin-orbit angle...
We present here high resolution echelle spectra taken during three observing runs of 14 single late-type stars identified in our previous studies (Montes et al. [CITE], hereafter Paper I) as possible members different young stellar kinematic groups (Local Association (20-150 Myr), Ursa Major group (300 Hyades supercluster (600 and IC 2391 (35 Myr)). Radial velocities have been determined by cross correlation with radial velocity standard used together precise measurements proper motions...
The design and construction of CARMENES has been presented at previous SPIE conferences. It is a next-generation radial-velocity instrument the 3.5m telescope Calar Alto Observatory, which was built by consortium eleven Spanish German institutions. consists two separate échelle spectrographs covering wavelength range from 0.52 to 1.71μm spec-tral resolution R < 80,000, fed fibers Cassegrain focus telescope. saw "First Light" on Nov 9, 2015. During commissioning initial operation phases, we...
We use the fundamental parameters delivered by GES consortium in first internal data release to select members of $\gamma$ Vel and Cha I among UVES GIRAFFE spectroscopic observations. A total 140 74 were studied. calculated stellar luminosities through spectral energy distributions, while masses derived comparison with evolutionary tracks. The subtraction low-activity slowly rotating templates, which are rotationally broadened match $v\sin i$ targets, enabled us measure equivalent widths...
We report on the first star discovered to host a planet detected by radial velocity (RV) observations obtained within CARMENES survey for exoplanets around M dwarfs. HD 147379 ($V = 8.9$ mag, $M 0.58 \pm 0.08$ M$_{\odot}$), bright M0.0V at distance of 10.7 pc, is found undergo periodic RV variations with semi-amplitude $K 5.1\pm0.4$ m s$^{-1}$ and period $P 86.54\pm0.06$ d. The signal in our data, which were taken between 2016 2017, supported HIRES/Keck that since 2000. are interpreted as...
We have obtained an XMM-Newton observation and a broad-band spectrum from the ultraviolet to near infrared with X-Shooter for one of nearest M9 dwarfs, DENIS-P J1048-3956 (4pc). integrate these data by compilation activity parameters ultracool dwarfs literature aim advance our understanding objects comparing them early-M type dwarf stars Sun. Our deep has led first X-ray detection (log Lx = 25.1) as well measurement its V band brightness (V 17.35mag). Flux-flux relations between...