A5039295920- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Advancements in Semiconductor Devices and Circuit Design
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Electrical Fault Detection and Protection
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Advanced Optical Sensing Technologies
- Non-Destructive Testing Techniques
- Astro and Planetary Science
- Particle physics theoretical and experimental studies
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Particle Accelerators and Free-Electron Lasers
- Radio Astronomy Observations and Technology
- Superconducting Materials and Applications
- Adaptive optics and wavefront sensing
- Nuclear Physics and Applications
University of Lisbon
2005-2024
Centre for Research in Anthropology
2024
Institute of Astrophysics and Space Sciences
2006-2023
Instituto Superior Técnico
2005-2022
Campbell Collaboration
2022
European Southern Observatory
2020
Universidade Federal de Minas Gerais
2019
Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento
1998-2018
Universidad Nacional Autónoma de México
2014
Hospital de Egas Moniz
2011
We present distance measurements to 71 high redshift type Ia supernovae discovered during the first year of 5-year Supernova Legacy Survey (SNLS). These events were detected and their multi-color light-curves measured using MegaPrime/MegaCam instrument at Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degree fields in bands, as part CFHT (CFHTLS). Follow-up spectroscopy was performed VLT, Gemini Keck telescopes confirm nature measure redshift. With this data...
Aims. We present cosmological constraints from a joint analysis of type Ia supernova (SN Ia) observations obtained by the SDSS-II and SNLS collaborations. The dataset includes several low-redshift samples (z< 0.1), all three seasons (0.05 <z< 0.4), years (0.2 1), it totals 740 spectroscopically confirmed supernovae with high-quality light curves.
We present a new compilation of Type Ia supernovae (SNe Ia), dataset low-redshift nearby-Hubble-flow SNe and analysis procedures to work with these heterogeneous compilations. This ``Union'' 414 SN Ia, which reduces 307 after selection cuts, includes the recent large samples from Supernova Legacy Survey ESSENCE Survey, older datasets, as well recently extended distant observed HST. A single, consistent blind procedure is used for all various subsamples, implemented that consistently weights...
We present here the Calar Alto Legacy Integral Field Area (CALIFA) survey, which has been designed to provide a first step in this direction.We summarize survey goals and design, including sample selection observational strategy.We also showcase data taken during observing runs (June/July 2010) outline reduction pipeline, quality control schemes general characteristics of reduced data. This is obtaining spatially resolved spectroscopic information diameter selected $\sim600$ galaxies Local...
We combine high redshift Type Ia supernovae from the first 3 years of Supernova Legacy Survey (SNLS) with other supernova (SN) samples, primarily at lower redshifts, to form a high-quality joint sample 472 SNe (123 low-$z$, 93 SDSS, 242 SNLS, and 14 {\it Hubble Space Telescope}). SN data alone require cosmic acceleration >99.9% confidence, including systematic effects. For dark energy equation state parameter (assumed constant out least $z=1.4$) in flat universe, we find $w =...
The use of integral field spectroscopy is since recently allowing to measure the emission line fluxes an increasingly large number star-forming galaxies, both locally and at high redshift. Many studies have used these derive gas-phase metallicity galaxies by applying so-called strong-line methods. However, indicators that datasets were empirically calibrated using few direct abundance data points (Te-based measurements). Furthermore, a precise determination prediction intervals commonly...
We present photometric properties and distance measurements of 252 high redshift Type Ia supernovae (0.15 < z 1.1) discovered during the first three years Supernova Legacy Survey (SNLS). These events were detected their multi-colour light curves measured using MegaPrime/MegaCam instrument at Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degree fields in bands. Follow-up spectroscopy was performed VLT, Gemini Keck telescopes to confirm nature measure redshifts....
We present observational constraints on the nature of dark energy using Supernova Legacy Survey three-year sample (SNLS3) Guy et al. and Conley use 472 Type Ia supernovae (SNe Ia) in this sample, accounting for recently discovered correlations between SN luminosity host galaxy properties, include effects all identified systematic uncertainties directly cosmological fits. Combining SNLS3 data with full WMAP7 power spectrum, Sloan Digital Sky luminous red a prior Hubble constant H0 from SHOES,...
We use three years of data from the Supernova Legacy Survey (SNLS) to study general properties core-collapse and type Ia supernovae. This is first such using "rolling search" technique which guarantees well-sampled SNLS light curves good efficiency for supernovae brighter than $i^\prime\sim24$. Using host photometric redshifts, we measure supernova absolute magnitude distribution down luminosities $4.5 {\rm mag}$ fainter normal SNIa. spectroscopy light-curve fitting discriminate against...
[Abridged] We use optical IFS of nearby SN host galaxies provided by the CALIFA Survey with goal finding correlations in environmental parameters at location different types. recover sequence association types to star-forming regions using several indicators ongoing and recent SF related both ionized gas stellar populations. While total is on average same for three types, SNe Ibc/IIb tend happen closer occur higher density locations compared II SNe~Ia, latter showing weakest correlation....
The metallicity of a supernova (SN) progenitor, together with its mass, is one the main parameters that rules their outcome. We present study 115 nearby SN host galaxies (0.005<z<0.03) which hosted 142 SNe using Integral Field Spectroscopy (IFS) from CALIFA survey. Using O3N2 we found no statistically significant differences between gas-phase metallicities at locations three types (Ia, Ib/c and II) all having ~8.50$\pm$0.02 dex. total galaxy are also very similar argue this because our...
We present the Pmas/ppak Integral-field Supernova hosts COmpilation (PISCO) which comprises Integral Field Spectroscopy (IFS) of 232 supernova (SN) host galaxies, that hosted 272 SNe, observed over several semesters with 3.5m telescope at Calar Alto Observatory (CAHA). PISCO is largest collection SN galaxies wide-field IFS, totaling 466,347 individual spectra covering a typical spatial resolution $\sim$380 pc. While focused studies regarding specific Ia- related topics will be published...
We present a measurement of the distant Type Ia supernova rate derived from first two years Canada -- France Hawaii Telescope Supernova Legacy Survey. observed four one-square degree fields with typical temporal frequency ~ 4 observer-frame days over time spans 158 to 211 per season for each field, breaks during full moon. used 8-10 meter-class telescopes spectroscopic followup confirm our candidates and determine their redshifts. Our starting sample consists 73 spectroscopically verified...
We present an extensive new time-series of spectroscopic data the peculiar SN 1999aa in NGC 2595. Our set includes 25 optical spectra between -11 and +58 days with respect to B-band maximum light, providing unusually complete time history. The early resemble those a 1991T-like object but relatively strong Ca H&K absorption feature. first clear sign Si II 6355, characteristic Type Ia supernovae, is found at day -7 its velocity remains constant up least month after light. transition...
In the context of ESA M5 (medium mission) call we proposed a new satellite mission, Theia, based on relative astrometry and extreme precision to study motion very faint objects in Universe. Theia is primarily designed local dark matter properties, existence Earth-like exoplanets our nearest star systems physics compact objects. Furthermore, about 15 $\%$ mission time was dedicated an open observatory for wider community propose complementary science cases. With its unique metrology system...
We present a fully consistent catalog of local and global properties host galaxies 882 Type Ia supernov\ae\ (SNIa) that were selected based on their light-curve properties, spanning the redshift range $0.01 < z 1.\text{}$ This corresponds to preliminary version compilation sample includes Supernova Legacy Survey (SNLS) 5-year data, Sloan Digital Sky (SDSS), low-redshift surveys. measured low- moderate-redshift galaxy photometry in SNLS SDSS images used spectral energy distribution (SED)...
Peculiar dust extinction laws have been reported for some type Ia supernovae (SNe) with the parameter $R_V$ much lower than average value Milky Way (MW) of 3.1. Using optical photopolarimetry supernova (SN) host galaxies, a few years after explosion, we estimate in vicinity each SN and compare it law calculated directly from observations. Multiband photopolarimetric data nine hosts eleven SNe, acquired VLT-FORS2 IPOL mode, are used to map polarization angle degree galaxy. Data processed...
<i>Aims. <i/>We present 139 spectra of 124 Type Ia supernovae (SNe Ia) that were observed at the ESO/VLT during first three years Canada-France-Hawaï Telescope (CFHT) supernova legacy survey (SNLS). This homogeneous data set is used to test for redshift evolution SN spectra, and will be in SNLS 3rd year cosmological analyses.<i>Methods. <i/>Spectra have been reduced extracted with a dedicated pipeline uses photometric information from deep CFHT (CFHT-LS) reference images trace, sub-pixel...