M. R. Zapatero Osorio
A5024232124- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- Astrophysical Phenomena and Observations
- Atmospheric Ozone and Climate
- Molecular Spectroscopy and Structure
- Solar and Space Plasma Dynamics
- SAS software applications and methods
- History and Developments in Astronomy
- Logic, Reasoning, and Knowledge
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
- Cosmology and Gravitation Theories
- Space Exploration and Technology
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Semantic Web and Ontologies
- Multi-Agent Systems and Negotiation
- Advanced Frequency and Time Standards
Centro de Astrobiología
2016-2025
The University of Sydney
2023
National Postdoctoral Association
2023
Centre de Recerca Matemàtica
2023
Instituto de Astrofísica de Canarias
2000-2022
Universitat de València
2019-2022
Brera Astronomical Observatory
2022
Instituto Nacional de Técnica Aeroespacial
2010-2021
Consejo Superior de Investigaciones Científicas
1999-2021
University of Florence
2020
We present spectra for 12 new ultracool dwarfs found in the DENIS infrared survey. Seven of them have spectral types at bottom M-class (M8–M9.5), and other five belong to cooler "L" class. also two L by EROS 2 proper-motion introduce a scheme dwarf classification that is based on an extension pseudocontinuum ratio previously defined M dwarfs. For calibrating subclasses, we use temperature scale late-M recently obtained Basri et al. from synthetic spectrum fitting high-resolution profiles Cs...
ESPRESSO is the new high-resolution spectrograph of ESO's Very-Large Telescope (VLT). It was designed for ultra-high radial-velocity precision and extreme spectral fidelity with aim performing exoplanet research fundamental astrophysical experiments unprecedented accuracy. able to observe any four Unit Telescopes (UT) VLT at a resolving power 140,000 or 190,000 over 378.2 788.7 nm wavelength range, all UTs together, turning into 16-m diameter equivalent telescope in terms collecting area,...
Abstract The acronym ESPRESSO stems for Echelle SPectrograph Rocky Exoplanets and Stable Spectroscopic Observations; this instrument will be the next VLT high resolution spectrograph. spectrograph installed at Combined‐Coudé Laboratory of linked to four 8.2 m Unit Telescopes (UT) through optical Coudé trains. combine efficiency extreme spectroscopic precision. is foreseen achieve a gain two magnitudes with respect its predecessor HARPS, improve instrumental radial‐velocity precision reach 10...
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...
Proxima Centauri is the closest star to Sun. This small, low-mass, mid M dwarf known host an Earth-mass exoplanet with orbital period of 11.2 days within habitable zone, as well a long-period planet candidate close 5 years. We report on analysis large set observations taken ESPRESSO spectrograph at VLT aimed thorough evaluation presence third low-mass planetary companion, which started emerging during previous campaign. Radial velocities (RVs) were calculated using both cross-correlation...
We present the discovery by optical and near-infrared imaging of an extremely red, low-luminosity population isolated objects in young, nearby stellar cluster around multiple, massive star σ Orionis. The proximity (352 parsecs), youth (1 million to 5 years), low internal extinction make this ideal site explore substellar domain from hydrogen mass limit down a few Jupiter masses. Optical low-resolution spectroscopy three these confirms very cool spectral energy distribution (atmospheric...
We present a CCD-based photometric survey covering 870 arcmin2 in young stellar cluster around the multiple star σ Orionis. Our survey-limiting R, I, and Z magnitudes are 23.2, 21.8, 21.0, respectively, completeness being about 2.2 mag brighter. From our color-magnitude diagrams, we have selected 49 faint objects (I = 15-21 mag), which smoothly extrapolate sequence defined by more massive known members. Adopting currently accepted age interval of 2-10 Myr for Orion 1b association, Orionis is...
ESPRESSO, the Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations, will combine efficiency of modern echelle spectrograph design with extreme radial-velocity precision. It be installed on ESO's VLT in order to achieve a gain two magnitudes respect its predecessor HARPS, instrumental radialvelocity precision improved reach cm/s level. Thanks characteristics ability combining incoherently light 4 large telescopes, ESPRESSO offer new possibilities various fields...
We present intermediate- and low-resolution optical spectra around Hα Li i λ6708 Å for a sample of 25 low mass stars 2 brown dwarfs with confirmed membership in the pre-main sequence stellar σ Orionis cluster. Our observations are intended to investigate age The spectral types derived our target found be range K6–M8.5, which corresponds interval roughly 1.2–0.02 on basis state-of-the-art evolutionary models. Radial velocities (except one object) consistent Orion complex. All cluster members...
We report the results of a synoptic study photometric and spectroscopic variability classical T Tauri star AA Tau on timescales ranging from few hours to several weeks. The light curve had been previously shown vary with 8.2 d period, exhibiting roughly constant brightness level, interrupted by quasi-cyclic fading episodes, which we interpreted as recurrent eclipses central warped inner edge its accretion disk (Bouvier et al. [CITE]). Our observations show system is dynamic presents...
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...
We report on our analysis of the VISTA Orion ZYJHKs photometric data (completeness magnitudes Z=22.6 and J=21.0mag) focusing a circular area 2798.4 arcmin^2 around young sigma Orionis star cluster (~3Myr, ~352pc, solar metallicity). The combination photometry with optical, WISE Spitzer allows us to identify total 210 member candidates masses in interval 0.25-0.004Msun, 23 which are new planetary-mass object findings. These discoveries double number known so far. One has colors compatible T...
Ultra hot Jupiters orbit very close to their host star and consequently receive strong irradiation that makes atmospheric chemistry different from the common gas giants. Here, we study atmosphere of one these particular planets, MASCARA-2b/KELT-20b, using four transit observations with high resolution spectroscopy facilities. Three were performed HARPS-N CARMENES. We simultaneously observed transits MuSCAT2 monitor possible spots in stellar surface. At resolution, transmission residuals show...
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...
It has been posited that lunar eclipse observations may help predict the in-transit signature of Earth-like extrasolar planets. However, a comparative analysis two phenomena addressing in detail transport stellar light through planet's atmosphere not yet presented. Here, we proceed with investigation both by making use common formulation. Our starting point is set previously unpublished near-infrared spectra collected at various phases during August 2008 eclipse. We then take formulation to...
Euclid is the second M-class mission of ESA Cosmic Vision programme, with principal science goal studying dark energy. also expected to undertake additional Legacy Science programmes. One proposal Exoplanet Survey (ExELS) which will be first survey able measure abundance exoplanets down Earth mass for host separations from ~1AU out free-floating (unbound) regime. The cold and exoplanet regimes represent a crucial discovery space testing planet formation theories. ExELS use gravitational...
WASP-121b is one of the most studied Ultra-hot Jupiters: many recent analyses its atmosphere report interesting features at different wavelength ranges. In this paper we analyze transit acquired with high-resolution spectrograph ESPRESSO VLT in 1-telescope mode, and partial taken during commissioning instrument 4-telescope mode. We investigate anomalous in-transit radial velocity curve study transmission spectrum planet. By analysing velocities were able to infer presence atmospheric...
Hot gas giant exoplanets can lose part of their atmosphere due to strong stellar irradiation, and these losses affect physical chemical evolution. Studies atmospheric escape from have mostly relied on space-based observations the hydrogen Lyman-α line in far ultraviolet region, which is strongly affected by interstellar absorption. Using ground-based high-resolution spectroscopy, we detected excess absorption helium triplet at 1083 nanometers during transit Saturn-mass exoplanet WASP-69b, a...
Context: Recently, the He I triplet at 10830 \r{A} has been rediscovered as an excellent probe of extended and possibly evaporating atmospheres close-in transiting planets. This already resulted in detections this a handful planets, both from space ground. However, while strong signal is expected for hot Jupiter HD 209458 b, only upper limits have obtained so far. Aims: Our goal to measure helium excess absorption b assess atmosphere planet possible evaporation. Methods: We new...
We aim to confirm the presence of Proxima b using independent measurements obtained with new ESPRESSO spectrograph, and refine planetary parameters taking advantage its improved precision. analysed 63 spectroscopic observations taken during 2019. radial velocity a typical photon noise 26 cm/s. ran joint MCMC analysis on time series full-width half maximum cross-correlation function model stellar signals present in data, applying Gaussian process regression deal activity. independently data....
In a search for common proper motion companions using the VISTA Hemisphere Survey (VHS) and 2MASS catalogs we have identified very red ( mag) late-L dwarf companion of previously unrecognized M VHS J125601.92-125723.9 (hereafter 1256-1257), located at projected angular separation 8 06 ± 0 03. this work present suite astrometric, photometric, spectroscopic observations new pair in an effort to confirm companionship characterize components. From low-resolution (R ∼ 130–600) optical...