A5006011475- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
- Galaxies: Formation, Evolution, Phenomena
- Geophysics and Gravity Measurements
- History and Developments in Astronomy
- Distributed and Parallel Computing Systems
- Scientific Computing and Data Management
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Planetary Science and Exploration
- Advanced Data Storage Technologies
- CCD and CMOS Imaging Sensors
- Astrophysical Phenomena and Observations
- Media, Journalism, and Communication History
- Research Data Management Practices
- Geomagnetism and Paleomagnetism Studies
- Advanced Computational Techniques and Applications
Centro de Astrobiología
2016-2025
Rutgers, The State University of New Jersey
2025
Universidad de Costa Rica
2023
Virtualware Group (Spain)
2012-2022
Consejo Superior de Investigaciones Científicas
2010-2019
European Space Astronomy Centre
2009-2019
Instituto Nacional de Técnica Aeroespacial
2005-2019
European Southern Observatory
2010-2019
Observatoire astronomique de Strasbourg
2019
Université de Strasbourg
2019
Context. The physical properties of almost any kind astronomical object can be derived by fitting synthetic spectra or photometry extracted from theoretical models to observational data.
Context: The current distribution of planet mass vs. incident stellar X-ray flux supports the idea that photoevaporation atmosphere may take place in close-in planets. Integrated effects have to be accounted for. A proper calculation loss rate due requires estimate total irradiation from whole XUV range. Aims: purpose this paper is extend analysis planetary atmospheres accessible X-rays mostly unobserved EUV range by using coronal models stars calculate contribution spectra. evolution...
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...
In this paper we present the first comprehensive results extracted from spectroscopic campaigns carried out by EXPORT (EXoPlanetary Observational Research Team) consortium. During 1998-1999, an intensive observational effort in framework of origin and evolution protoplanetary systems order to obtain clues on evolutionary path early stages pre-main sequence stars with planets already formed. The spectral types 70 stars, projected rotational velocities, , 45 mainly Vega-type sequence, have...
Context.The fast classification of new variable stars is an important step in making them available for further research. Selection science targets from large databases much more efficient if they have been classified first. Defining the classes terms physical parameters also to get unbiased statistical view on variability mechanisms and borders instability strips.
Debris discs are a consequence of the planet formation process and constitute fingerprints planetesimal systems. Their solar system's counterparts asteroid Edgeworth-Kuiper belts. The DUNES survey aims at detecting extra-solar analogues to belt around solar-type stars, putting in this way system into context. allows us address some questions related prevalence properties We used {\it Herschel}/PACS observe sample nearby FGK stars. Data 100 160 $\mu$m were obtained, complemented cases with...
We describe a large-scale far-infrared line and continuum survey of protoplanetary disk through to young debris systems carried out using the ACS instrument on Herschel Space Observatory. This Open Time Key program, known as GASPS (Gas Survey Protoplanetary Systems), targeted ∼250 stars in narrow wavelength regions covering [OI] fine structure at 63 μm brightest such objects. A subset targets were also surveyed [OI]145 μm, [CII] 157 well several transitions H2O high-excitation CO lines...
We present a catalogue of 73 221 white dwarf candidates extracted from the astrometric and photometric data recently published Gaia-DR2 catalogue. White dwarfs were selected Gaia Hertzsprung–Russell diagram with aid most updated population synthesis simulator. Our analysis shows that has virtually identified all within 100 pc Sun. Hence, our sub-population 8555 this distance limit colour range considered, |$-\, 0.52\lt (G_{\rm BP}-G_{\rm RP})\lt 0.80$|, is largest complete volume-limited...
The CARMENES instrument was conceived to deliver high-accuracy radial velocity (RV) measurements with long-term stability search for temperate rocky planets around a sample of nearby cool stars. broad wavelength coverage designed provide range stellar activity indicators assess the nature potential RV signals and valuable spectral information help characterise targets. Data Release 1 (DR1) makes public all observations obtained during guaranteed time observations, which ran from 2016 2020...
ABSTRACT The third data release of Gaia has provided low-resolution spectra for ∼100 000 white dwarfs (WDs) that, together with the excellent photometry and astrometry, represent an unrivalled benchmark study this population. In work, we first built a highly complete volume-limited sample consisting in 12 718 WDs within 100 pc from Sun. use Virtual Observatory Spectral energy distribution Analyzer tool allowed us to perform automated fitting their spectral distributions different atmospheric...
The detection of the He i λ10830,Å triplet in exoplanet atmospheres has opened a new window for probing planetary properties, including atmospheric escape. Unlike Lyman α, is significantly less affected by interstellar medium (ISM) absorption. Sufficient X-ray and extreme ultraviolet (XUV) stellar irradiation may trigger formation via photoionization posterior recombination processes planet atmospheres. Only weak trend between XUV emission strength been observed so far. We aim to confirm...
<i>Context. <i/> <i>Aims. <i/>In this work, we describe the pipeline for fast supervised classification of light curves observed by CoRoT exoplanet CCDs. We present results obtained first four measured fields, which represent a one-year in-orbit operation.<i>Methods. <i/>The basis adopted methodology has been described in detail previous paper, as is its application to OGLE database. Here, modifications algorithms and training set optimize performance when applied data.<i>Results....
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...
We report the discovery of WTS-2 b, an unusually close-in 1.02-day hot Jupiter (Mp=1.12MJ, Rp=1.363RJ) orbiting a K2V star, which has possible gravitationally-bound M-dwarf companion at 0.6 arcsec separation contributing ~20 percent total flux in observed J-band light curve. The planet is only 1.5 times from its host star it would be destroyed by Roche lobe overflow, and predicted remaining lifetime just ~40 Myr, assuming tidal dissipation quality factor Q'*=10^6. Q'* key determining how...
The kinematic properties of the different classes objects in a given association hold important clues about its member's history, and offer unique opportunity to test predictions various models stellar formation evolution. DANCe (standing for Dynamical Analysis Nearby ClustErs) is survey program aimed at deriving comprehensive homogeneous census substellar content number nearby (<1kpc) young (<500Myr) associations. Whenever possible, members will be identified based on their kinematics...
J-PLUS is an ongoing 12-band photometric optical survey, observing thousands of square degrees the Northern hemisphere from dedicated JAST/T80 telescope at Observatorio Astrof\'isico de Javalambre. T80Cam a 2 sq.deg field-of-view camera mounted on this 83cm-diameter telescope, and equipped with unique system filters spanning entire range. This filter combination broad, medium narrow-band filters, optimally designed to extract rest-frame spectral features (the 3700-4000\AA\ Balmer break...
Context. Herbig Ae/Be stars (HAeBes) have so far been studied based on relatively small samples that are scattered throughout the sky. Their fundamental stellar and circumstellar parameters statistical properties were derived with heterogeneous approaches before Gaia . Aims. Our main goal is to contribute study of HAeBes from largest sample such sources date, for which determined homogeneously analysis spectral energy distributions (SEDs) EDR3 parallaxes photometry. Methods. Multiwavelength...
The Gl 486 system consists of a very nearby, relatively bright, weakly active M3.5 V star at just 8 pc with warm transiting rocky planet about 1.3 R_Terra and 3.0 M_Terra that is ideal for both transmission emission spectroscopy testing interior models telluric planets. To prepare future studies, we collected light curves seven new transits observed the CHEOPS space mission radial velocities obtained MAROON-X/Gemini North CARMENES/Calar Alto telescopes, together previously published...
For a complete understanding of the physical processes causing photometric variability pre-main sequence systems, simultaneous optical and near-IR observations are required to disentangle emission from stars that their associated circumstellar disks. Data this sort extremely rare little systematic work has been reported date. The presented in paper is attempt direction. It presents an analysis 18 Herbig Ae/Be T Tauri which were observed October 98 by EXPORT collaboration. time difference...
This paper presents optical UBVRI broadband photo-polarimetry of the EXPORT sample obtained at 2.5 m Nordic Optical Telescope. The database consists multi-epoch 68 pre-main-sequence and main-sequence stars. An investigation polarization variability indicates that 22 objects are variable 3σ level in our data. All these pre-main sequence stars, consisting both T Tauri Herbig Ae/Be while main sequence, Vega type post-T not variable. properties sources mostly indicative UXOR-type behaviour; show...