J. C. Morales
A5078031505- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Neutrino Physics Research
- Adaptive optics and wavefront sensing
- Scientific Research and Discoveries
- Atomic and Subatomic Physics Research
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- High-Energy Particle Collisions Research
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Quantum Chromodynamics and Particle Interactions
- Atmospheric Ozone and Climate
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Quantum Mechanics and Applications
- Nuclear physics research studies
- Metaheuristic Optimization Algorithms Research
Institute of Space Sciences
2016-2025
Institut d'Estudis Espacials de Catalunya
2014-2025
Universitat Politècnica de Catalunya
2025
Universidad del Valle
2024
West Texas A&M University
2023-2024
Universidad Nacional Autónoma de México
2007-2022
Icesi University
2022
Consejo Superior de Investigaciones Científicas
2016-2021
Wind Energy Institute of Canada
2021
University of Kansas
2021
Context: The CARMENES survey is a high-precision radial velocity (RV) programme that aims to detect Earth-like planets orbiting low-mass stars. Aims: We develop least-squares fitting algorithms derive the RVs and additional spectral diagnostics implemented in SpEctrum Radial Velocity Analyser (SERVAL), publicly available python code. Methods: measured using high signal-to-noise templates created by coadding all spectra of each star.We define chromatic index as RV gradient function wavelength...
Thousands of exoplanets have now been discovered with a huge range masses, sizes and orbits: from rocky Earth-like planets to large gas giants grazing the surface their host star. However, essential nature these remains largely mysterious: there is no known, discernible pattern linking presence, size, or orbital parameters planet its parent We little idea whether chemistry linked formation environment, type star drives physics planet's birth, evolution. ARIEL was conceived observe number...
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...
We determine the radii and masses of 293 nearby, bright M dwarfs CARMENES survey. This is first time that such a large homogeneous high-resolution (R>80 000) spectroscopic survey has been used to derive these fundamental stellar parameters. derived using Stefan-Boltzmann's law. obtained required effective temperatures $T_{\rm eff}$ from spectral analysis we luminosities L integrated broadband photometry together with Gaia DR2 parallaxes. The mass was then determined mass-radius relation...
The CARMENES exoplanet survey of M dwarfs has obtained more than 18 000 spectra 329 nearby over the past five years as part its guaranteed time observations (GTO) program. We determine planet occurrence rates with 71 stars from GTO program for which we have 50 observations. use injection-and-retrieval experiments on radial-velocity (RV) series to measure detection probabilities. include 27 planets in 21 planetary systems our analysis. find 0.06+0.04-0.03 giant (100 M_Earth < M_pl sin i 1000...
The International Germanium Experiment (IGEX) has analyzed 117 mol yr of 76Ge data from its isotopically enriched (86% 76Ge) germanium detectors. Applying pulse-shape discrimination to the more recent data, lower bound on half-life for neutrinoless double-beta decay is T1/2(0ν)>1.57×1025yr (90% C.L.). This corresponds an upper in Majorana neutrino mass parameter, ⟨mν⟩, between 0.33 and 1.35 eV, depending choice theoretical nuclear matrix elements used analysis.Received 29 October...
We have searched for solar axions or other pseudoscalar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup. Whereas we previously reported results from CAST with evacuated magnet bores (Phase I), setting limits on lower mass axions, here report where were filled 4He gas II) of variable pressure. The introduction generates a refractive photon mγ, thereby achieving maximum possible conversion rate those axion masses ma match mγ. With 160 different...
Spectroscopic and eclipsing binary systems offer the best means for determining accurate physical properties of stars, including their masses radii. The data available low-mass stars have yielded firm evidence that stellar structure models predict smaller radii higher effective temperatures than observed, but number with detailed analyses is still small. In this paper, we present a complete reanalysis one such systems, CM Dra, composed two dM4.5 stars. New existing light curves as well...
Context. CARMENES is a stabilised, high-resolution, double-channel spectrograph at the 3.5 m Calar Alto telescope. It optimally designed for radial-velocity surveys of M dwarfs with potentially habitable Earth-mass planets. Aims. We prepare list brightest, single in each spectral subtype observable from northern hemisphere, which we will select best planet-hunting targets CARMENES. Methods. In this first paper on preparation our input catalogue, compiled large amount public data and...
The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using 3He as a buffer gas. At T=1.8 K this allows larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with 4He. With about 1 h of data taking at each 252 different we have scanned the mass range 0.39 eV < m_a 0.64 eV. From absence excess X-rays when magnet was pointing Sun set typical upper limit on axion-photon coupling g_ag 2.3 x 10^{-10} GeV^{-1} 95% CL, exact...
We 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 near-infrared He I triplet 10830 Å all transits. During mid-transit, mean level $0.88\pm0.04$ % measured a $\pm$10 km s$^{-1}$ range net blueshift $-3.5\pm0.4$ (10829.84--10830.57 Å). The exhibits radial velocities $+6.5\pm3.1$ and $-12.6\pm1.0$ during ingress egress, respectively; planetary rest frame. show that stellar...
In recent years, analyses of eclipsing binary systems have unveiled differences between the observed fundamental properties low-mass stars and those predicted by stellar structure models. Particularly, radius effective temperatures computed from models are ~ 5-10% lower 3-5% higher than observed, respectively. These discrepancies been attributed to different factors, notably high levels magnetic activity present on these stars. this paper, we test effect both observational analysis binaries...
We develop a robust optimization framework for dynamic empty repositioning problems modeled using time-space networks. In such problems, uncertainty arises primarily from forecasts of future supplies and demands assets at different time epochs. The proposed approach models intervals about nominal forecast values limit on the systemwide scaled deviation values. A plan is defined as one in which typical flow balance constraints bounds are satisfied values, recoverable under limited set...
Context. Teegarden's Star is the brightest and one of nearest ultra-cool dwarfs in solar neighbourhood. For its late spectral type (M7.0V), star shows relatively little activity a prime target for near-infrared radial velocity surveys such as CARMENES. Aims. As part CARMENES search exoplanets around M dwarfs, we obtained more than 200 radial-velocity measurements analysed them planetary signals. Methods. We find periodic variability velocities Star. also studied photometric to rule out...
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...
We report the detection of a transiting Earth-size planet around GJ 357, nearby M2.5 V star, using data from Transiting Exoplanet Survey Satellite (TESS). 357 b (TOI-562.01) is transiting, hot, Earth-sized ( T eq = 525 ± 11 K) with radius R 1.217 0.084 ⊕ and an orbital period P 3.93 d. Precise stellar radial velocities CARMENES PFS, as well archival HIRES, UVES, HARPS also display 3.93-day periodicity, confirming planetary nature leading to mass M 1.84 0.31 . In addition velocity signal for...
CARMENES is a spectrograph for radial velocity surveys of M dwarfs with the aim detecting Earth-mass planets orbiting in habitable zones their host stars. To ensure an optimal use Guaranteed Time Observations, this paper we investigate correlation activity and rotation approximately 2200 dwarfs, ranging spectral type from M0.0 V to M9.0 V. We present new high-resolution spectroscopic observations FEROS, CAFE, HRS 500 dwarfs. For each observation, determined its measured Halpha index...
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,...
Aims: We search for low-mass companions of M dwarfs and characterize their multiplicity fraction with the purpose helping in selection most appropriate targets CARMENES exoplanet survey. Methods: obtained high-resolution images I band lucky imaging instrument FastCam at 1.5 m Telescopio Carlos Sanchez 490 mid- to late-M dwarfs. For all detected binaries, we measured angular separations, position angles, magnitude differences band. also calculated masses each individual component estimated...