A. de Ugarte Postigo
A5023277552- Gamma-ray bursts and supernovae
- SAS software applications and methods
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Adaptive optics and wavefront sensing
- Isotope Analysis in Ecology
- Galaxies: Formation, Evolution, Phenomena
- Methane Hydrates and Related Phenomena
- Particle Detector Development and Performance
- Astrophysics and Star Formation Studies
- Spectroscopy and Chemometric Analyses
- Atmospheric Ozone and Climate
- Microbial Metabolites in Food Biotechnology
- Geophysics and Gravity Measurements
- Planetary Science and Exploration
- Bone and Dental Protein Studies
- Calibration and Measurement Techniques
- Dark Matter and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Advanced X-ray and CT Imaging
Laboratoire d’Astrophysique de Marseille
2024-2025
Château Gombert
2024-2025
Observatoire de la Côte d’Azur
2021-2025
Artemis (United States)
2023-2025
Aix-Marseille Université
2024-2025
Université Côte d'Azur
2022-2024
Centre National de la Recherche Scientifique
2022-2024
Instituto de Astrofísica de Andalucía
2014-2023
Consorci Institut D'Investigacions Biomediques August Pi I Sunyer
2023
Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas
2023
X-shooter is the first 2nd generation instrument of ESO Very Large Telescope(VLT). It a very efficient, single-target, intermediate-resolution spectrograph that was installed at Cassegrain focus UT2 in 2009. The covers, single exposure, spectral range from 300 to 2500 nm. designed maximize sensitivity this through dichroic splitting three arms with optimized optics, coatings, dispersive elements and detectors. operates intermediate resolution (R~4,000 - 17,000, depending on wavelength slit...
Abstract We report the discovery and monitoring of near-infrared counterpart (AT2017gfo) a binary neutron-star merger event detected as gravitational wave source by Advanced Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo (GW170817) short gamma-ray burst Fermi Gamma-ray Burst Monitor (GBM) Integral SPI-ACS (GRB 170817A). The evolution transient light is consistent with predictions for behavior “kilonova/macronova” powered radioactive decay massive neutron-rich nuclides...
Variable X-ray and gamma-ray emission is characteristic of the most extreme physical processes in Universe, studying sources these energetic photons has been a major driver astronomy for past 50 years. Here we present multiwavelength observations unique selected transient, discovered by Swift, which was accompanied bright across electromagnetic spectrum, whose properties are unlike any previously observed source. We pinpoint event to center small, star-forming galaxy at redshift z=0.3534....
We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for total 76 GRBs, and present an additional three pre-Swift not included in earlier sample. Furthermore, we publish 840 new points 42 GRB afterglows, sets 050319, 050408, 050802, 050820A, 050922C, 060418, 080413A 080810. analyzed light curves all derived spectral energy distributions with best quality, allowing us estimate host...
(Abridged). We present a sample of 77 optical afterglows (OAs) Swift detected GRBs for which spectroscopic follow-up observations have been secured. provide linelists and equivalent widths all lines redward Ly-alpha. discuss to what extent the current bursts with OA spectroscopy is biased subsample GRBs. For that purpose we define an X-ray selected optimal conditions ground-based follow up from period March 2005 September 2008; 146 fulfill our criteria. derive redshift distribution this...
We present comprehensive multiwavelength observations of three gamma-ray bursts (GRBs) with durations several thousand seconds. demonstrate that these events are extragalactic transients; in particular we resolve the long-standing conundrum distance GRB 101225A (the "Christmas-day burst"), finding it to have a redshift z=0.847, and showing two apparently similar (GRB 111209A 121027A) lie at z=0.677 z=1.773 respectively. The systems show extremely unusual X-ray optical lightcurves, very...
Superluminous supernovae (SLSNe) are very bright explosions that were only discovered recently and show a preference for occurring in faint dwarf galaxies. Understanding why stellar evolution yields different types of these environments is fundamental order to both uncover the elusive progenitors SLSNe study star formation In this paper, we present first results our project SUperluminous Supernova Host galaxIES, focusing on sample which have obtained spectroscopy. We SLSNe-I SLSNe-R...
The mergers of binary compact objects such as neutron stars and black holes are central interest to several areas astrophysics, including the progenitors gamma-ray bursts (GRBs), sources high-frequency gravitational waves likely production sites for heavy element nucleosynthesis via rapid capture (the r-process). These elements include some great geophysical, biological cultural importance, thorium, iodine gold. Here we present observations exceptionally bright burst GRB 230307A. We show...
We present data and initial results from VLT/X-Shooter emission-line spectroscopy of 96 galaxies selected by long γ-ray bursts (GRBs) at 0.1 <z< 3.6, the largest sample GRB host spectra available to date. Most our GRBs were detected Swift 76% are 0.5 2.5 with a median zmed ~ 1.6. Based on Balmer and/or forbidden lines oxygen, nitrogen, neon, we measure systemic redshifts, star formation rates (SFR), visual attenuations (AV), oxygen abundances (12 + log (O/H)), widths (σ). study hosts up z...
The SUperluminous Supernova Host galaxIES (SUSHIES) survey aims to provide strong new constraints on the progenitors of superluminous supernovae (SLSNe) by understanding relationship their host galaxies. We present photometric properties 53 H-poor and 16 H-rich SLSN galaxies out $z\sim4$. model spectral energy distributions derive physical properties, which we compare with other galaxy populations. At low redshift, SLSNe are preferentially found in very blue, low-mass high average specific...
Abstract We present Hubble Space Telescope ( HST ) and Chandra imaging, combined with Very Large MUSE integral field spectroscopy of the counterpart host galaxy first binary neutron star merger detected via gravitational-wave emission by LIGO Virgo, GW170817. The galaxy, NGC 4993, is an S0 at z = 0.009783. There evidence for large, face-on spiral shells in continuum edge-on features visible nebular lines. This suggests that 4993 has undergone a relatively recent <mml:math...
Abstract We report our identification of the optical afterglow and host galaxy short-duration gamma-ray burst sGRB 160821B. The spectroscopic redshift is z = 0.162, making it one lowest bursts (sGRBs) identified by Swift . Our intensive follow-up campaign using a range ground-based facilities as well Hubble Space Telescope , XMM-Newton shows evidence for late-time excess near-infrared emission in addition to complex afterglow. light curve at X-ray frequencies reveals narrow jet, <?CDATA...
ABSTRACT We introduce the Swift Gamma-Ray Burst Host Galaxy Legacy Survey (“SHOALS”), a multi-observatory high-redshift galaxy survey targeting largest unbiased sample of long-duration gamma-ray burst (GRB) hosts yet assembled (119 in total). describe motivations and development our selection criteria, including an assessment impact various observability metrics on success rate afterglow-based redshift measurement. briefly outline host observational program, consisting deep Spitzer /IRAC...
ABSTRACT We present rest-frame near-IR (NIR) luminosities and stellar masses for a large uniformly selected population of gamma-ray burst (GRB) host galaxies using deep Spitzer Space Telescope imaging 119 targets from the Swift GRB Host Galaxy Legacy Survey spanning 0.03 < z 6.3, we determine effects galaxy evolution chemical enrichment on mass distribution across cosmic history. find rapid increase in characteristic NIR luminosity between ∼ 0.5 1.5, but little variation 1.5 5....