A5073896204- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Cosmology and Gravitation Theories
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- Superconducting and THz Device Technology
- History and Developments in Astronomy
- Particle Accelerators and Free-Electron Lasers
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- GNSS positioning and interference
- Optical Systems and Laser Technology
- Atmospheric Ozone and Climate
Universidad de La Laguna
2016-2025
Instituto de Astrofísica de Canarias
2016-2025
Marconi University
2024
Consejo Superior de Investigaciones Científicas
2014-2023
Unidades Centrales Científico-Técnicas
2014-2023
Centre de Recerca Matemàtica
2023
IAC (United States)
2000-2022
University of Oxford
2020-2022
University of Leicester
2021
Pontificia Universidad Católica de Chile
2021
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,...
Following the reported discovery of gravitational-wave pulse GW170817/ G298048 by three LIGO/Virgo antennae (Abbott et al., 2017a), MASTER Global Robotic Net telescopes obtained first image NGC 4993 galaxy after NS+NS merging. The optical transient OTJ130948.10-232253.3/SSS17a was later found, which appears to be a kilonova resulting from merger two neutron stars. In this paper we report independent detection and photometry made in white light B, V, R filters. We note that luminosity...
We present high-angular-resolution optical I-band imaging of 451 late K to mid-M nearby stars. These observations have been performed with Astralux and FastCam using the lucky technique. found 70 companions separations between 0.1 3.5 arcsec, out which 28 are new discoveries. derive a total binary fraction 20.3 +6.9 −5.2 per cent. Follow-up carried for 16 these binaries all them were confirmed as physically associated systems. Parallaxes available cent sample, providing reliable estimates...
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...
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...
We determine rotation periods of a sample 48 late F-type to mid-M dwarf stars using time series high-resolution spectroscopy the Ca ii H&K and H α chromospheric activity indicators. find good agreement between obtained from each these two An empirical relationship level emission measured by |$\log _{10}(R^{\prime }_{\rm HK}$|) spectroscopic is reported. This relation largely independent spectral type metallicity can be used make reliable prediction for K dwarfs with low levels activity. For...
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...
In this article we present a detailed spectroscopic analysis of more than 50 extra-solar planet host stars. Stellar atmospheric parameters and metallicities are derived using high resolution S/N spectra. The spectroscopy results, added to the previous studies, imply that have access large uniform sample for about 80 hosts We make use confirm metal-rich nature stars with planets, show planetary frequency is rising as function [Fe/H]. Furthermore, source metallicity shown most probably...
We have performed a detailed oxygen abundance analysis of 23 metal-poor (-3.0 < [Fe/H] -0.3) unevolved halo stars and one giant through the OH bands in near UV, using high-resolution echelle spectra. Oxygen is found to be overabundant with respect iron these stars, [O/Fe] ratio increasing from 0.6 1 between = -1.5 -3.0. The behavior overabundance similar that seen previous works based on O I IR triplet data. Contrary previously accepted picture, our abundances, derived low-excitation lines,...
view Abstract Citations (223) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectroscopy of a Brown Dwarf Candidate in the alpha Persei Open Cluster Rebolo, Rafael ; Martin, Eduardo L. Magazzu, Antonio Intermediate-resolution spectroscopy range 625-775 nm is reported for faint very-late-type object discovered two CCD images taken near center Alpha Per cluster. The spectrum shows strong absorption molecular bands, H-alpha emission, and KI...
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...
In this paper we present the Low Frequency Instrument (LFI), designed and developed as part of Planck space mission, ESA program dedicated to precision imaging cosmic microwave background (CMB). Planck-LFI will observe full sky in intensity polarisation three frequency bands centred at 30, 44 70 GHz, while higher frequencies (100-850 GHz) be covered by HFI instrument. The LFI is an array radiometers based on state-of-the-art Indium Phosphide cryogenic HEMT amplifiers implemented a...
We want to study the effects of formation planets and planetary systems on atmospheric Li abundance planet host stars. In this work we present new determinations lithium abundances for 326 Main Sequence stars with without in T$_\mathrm{eff}$ range 5600-5900 K. 277 come from HARPS sample, remaining targets have been observed a variety high resolution spectrographs. confirm significant differences distribution solar twins (T$_\mathrm{eff}$ = T$_{\odot} \pm$ 80 K, log g g$_{\odot}$ $\pm$ 0.2...
A long-term multi-purpose observational programme has started with HARPS-N@TNG aimed to characterise the global architectural properties of exoplanetary systems. In this first paper we fully transiting system Qatar-1. We exploit HARPS-N high-precision radial velocity measurements obtained during a transit measure Rossiter-McLaughlin effect in Qatar-1 system, and out-of-transit redetermine spectroscopic orbit. New photometric light-curves are analysed characterisation host star atmospheric...
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...