A5032160161- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Laser Design and Applications
- Cosmology and Gravitation Theories
- Particle physics theoretical and experimental studies
- Optics and Image Analysis
- Astronomical and nuclear sciences
- Historical Astronomy and Related Studies
- Geophysics and Gravity Measurements
- Molecular Spectroscopy and Structure
University of Alicante
2013-2023
Universidad Europea de Canarias
2023
Instituto de Astrofísica de Canarias
2019-2022
Universidad de La Laguna
2019-2022
Johns Hopkins University
2022
Universidad Complutense de Madrid
2012-2019
Centro de Astrobiología
2018
Instituto de Astrofísica de Andalucía
2018
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...
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...
In this study, we conduct a pilot program aimed at the red supergiant population of Magellanic Clouds. We intend to extend current known sample unexplored low end brightness distribution these stars, building more representative dataset with which extrapolate their behaviour other Galactic and extra-galactic environments. select candidates using only near infrared photometry, medium resolution multi-object spectroscopy, perform spectral classification derive line-of-sight velocities,...
We provide a complete characterization of the astrophysical properties σ Ori Aa, Ab, B hierarchical triple system and an improved set orbital parameters for highly eccentric Ab spectroscopic binary. compiled data comprising 90 high-resolution spectra covering total time span 1963 days. applied Lehman–Filhés method detailed analysis radial velocity curves performed combined quantitative by means stellar atmosphere code fastwind. used our own plus other available information on photometry...
We present a self-consistent study of cool supergiants (CSGs) belonging to the Magellanic clouds. calculated stellar atmospheric parameters using LTE KURUCZ and MARCS models for more than 400 individual targets by fitting careful selection weak metallic lines. explore existence T eff scale its implications in two different metallicity environments (each cloud). Critical in-depth tests have been performed assess reliability our (i.e. internal error budget, NLTE systematics). In addition,...
Statistical analyses from exoplanet surveys around low-mass stars indicate that super-Earth and Neptune-mass planets are more frequent than gas giants such stars, in agreement with core accretion theory of planet formation. Using precise radial velocities derived visual near-infrared spectra, we report the discovery a giant minimum mass 0.46 Jupiter masses an eccentric 204-day orbit very star GJ 3512. Dynamical models show high eccentricity is most likely explained planet-planet...
In recent years, temperature scales in cool supergiants (CSGs) have been disputed, and the possibility that spectral types (SpTs) do not depend primarily on has raised. We explore relations between different observed parameters capability of deriving accurate intrinsic stellar from them through analysis largest spectroscopic sample CSGs to date SMC LMC. possible correlations observational parameters, also making use near- mid-infrared colours literature photometric variability. Direct...
The mechanism by which supergiant (sg)B[e] stars support cool, dense dusty discs/tori and their physical relationship with other evolved, massive such as luminous blue variables is uncertain. In order to investigate both issues we have analysed the long term behaviour of canonical sgB[e] star LHA 115-S 18. We employed OGLE II-IV lightcurve search for (a-)periodic variability supplemented these data new historic spectroscopy. contrast historical expectations stars, S18 photometrically...
The multiplicity properties of massive stars are one the important outstanding issues in stellar evolution. Quantifying binary statistics all evolutionary phases is essential to paint a complete picture how and when interact with their companions, determine consequences these interactions. We investigate an almost census red supergiant (RSGs) NGC 330, young cluster SMC. Using combination multi-epoch HARPS MUSE spectroscopy, we estimate radial velocities assess kinematic 15 RSGs 330. Radial...
The relevance of M dwarfs in the search for potentially habitable Earth-sized planets has grown significantly last years. In our on-going effort to comprehensively and accurately characterise confirmed potential planet-hosting dwarfs, particular CARMENES survey, we have carried out a comprehensive multi-band photometric analysis involving spectral energy distributions, luminosities, absolute magnitudes, colours, types, from which derived basic astrophysical parameters. We carefully compiled...
Aims. We present a spectroscopic analysis of the extremely luminous red star VX Sgr based on high-resolution observations combined with AAVSO light curve data. Given puzzling characteristics Sgr, we explore three scenarios for its nature: massive supergiant (RSG) or hypergiant (RHG), Thorne Zytkow object (TZO), and an extreme Asymptotic Giant Branch (AGB) star. Methods. Sampling more than one whole cycle photometric variability, derive stellar atmospheric parameters by using state-of-the-art...
Context. The young massive cluster Westerlund 1 offers the promise of a grand laboratory for study high-mass star evolution, but its basic parameters are still poorly known. Aims. In this paper, we aim at better characterisation by determining some kinematic properties and analysing area surrounding population in foreground. Methods. We have used Gaia early data release 3 (EDR3) data, together with spectra large sample luminous stars field 1, to explore extent cluster. carried out...
Context. It has been suggested that the compact open cluster VdBH 222 is a young massive distant object.
The infrared Calcium Triplet and its nearby spectral region have been used for luminosity classification of late-type stars, but the samples cool supergiants (CSGs) very limited (in size, metallicity range, types covered). range Gaia Radial Velocity Spectrograph (RVS) covers most this does not reach main TiO bands in region, whose depths define M sequence. We study behaviour features around develop effective criteria to identify classify CSGs, comparing their efficiency with other methods...
Context. The Carina Nebula is one of the major massive star-forming regions in Galaxy. Its relatively nearby distance (2.35 kpc) makes it an ideal laboratory for study star formation, structure, and evolution, both individual stars stellar systems. Thanks to high-quality spectra provided by Gaia -ESO survey LiLiMaRlin library, as well EDR3 astrometry, a detailed homogeneous spectroscopic characterization its content can be carried out. Aims. Our main objective spectroscopically characterize...
We present observations from the Gaia-ESO Survey in lines of H$α$, [N II], [S II] and He I nebular emission central part Carina Nebula. investigate properties two already known kinematic components (approaching receding, respectively), which account for bulk emission. Moreover, we features much less low-intensity high-velocity (absolute RV $>$50 km/s) gas show that giving rise to H$α$ is dynamically well correlated, but not identical, seen through forbidden-line Gas temperatures are...
The characterisation of the multiplicity high-mass stars is fundamental importance to understand their evolution, diversity observed core-collapse supernovae and formation gravitational wave progenitor systems. Despite that, until recently, one final phases massive star evolution -- cool supergiant phase has received comparatively little attention. In this study we aim explore among supergiants (CSGs) in Large Small Magellanic Clouds (LMC SMC, respectively). To do compile extensive archival...
The Perseus OB1 association hosts one of the most populous groupings blue and red supergiants (Sgs) in Galaxy. We discuss whether massive O-type blue/red Sg stars located Per region are members same population examine their binary runaway status. gathered a total 405 high-resolution spectra for 88 suitable candidates around 4.5 deg from center association, compiled Gaia DR2 astrometry all them. This was used to investigate membership identify stars. By obtaining high-precision radial...
The heavily obscured open cluster Berkeley 51 shows characteristics typical of young massive clusters, even though the few previous studies have suggested older ages. We combine optical (UBV) and 2MASS photometry field with multi-object long-slit spectroscopy for a large sample stars. apply classical photometric analysis techniques to determine reddening cluster, then derive parameters via isochrone fitting. find population B-type stars, main-sequence turn-off at B3 V, as well number...
We present an atlas composed of more than 1500 spectra late-type stars (spectral types from G to M) observed simultaneously in the optical and calcium triplet spectral ranges. These were obtained as part a survey search for cool supergiants Magellanic Clouds taken over four epochs. provide luminosity classification each spectrum (71% are supergiants, 13% giants or luminous giants, 4% carbon S stars, remaining 12% foreground lesser luminosities). also detailed guide result extensive work done...
Galactic starburst clusters play a twin role in astrophysics, serving as laboratories for the study of stellar physics and also delineating structure recent star formation history Milky Way. In order to exploit these opportunities we have undertaken multi-epoch spectroscopic survey red supergiant dominated young massive thought be present at both near far ends Bar. Significant variability suggestive radial pulsations was found yellow VdBH 222 #505. Follow-up photometric investigations...
The IACOB project is an ambitious long-term which contributing to step forward in our knowledge about the physical properties and evolution of Galactic massive stars. aims at building a large database high-resolution, multi-epoch, spectra OB stars, scientific exploitation using state-of-the-art models techniques. In this proceeding, we summarize latest updates spectroscopic highlight some first results from project; also announce data release public version iacob-broad tool for...
We present a new catalogue of cool supergiants in section the Perseus arm, most which had not been previously identified. To generate it, we have used set well-defined photometric criteria to select large number candidates (637) that were later observed at intermediate resolution infrared calcium triplet spectral range, using long-slit spectrograph. separate red from luminous giants, statistical method, developed previous works and improved paper. method assign probabilities being supergiant...