B. Sánchez
A5002117021- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Planetary Science and Exploration
- Geophysics and Gravity Measurements
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Distributed and Parallel Computing Systems
- Infectious Diseases and Mycology
- CCD and CMOS Imaging Sensors
- Space Satellite Systems and Control
- Antifungal resistance and susceptibility
- Isotope Analysis in Ecology
- Calibration and Measurement Techniques
- Infections and bacterial resistance
- Atomic and Subatomic Physics Research
Duke University
2019-2025
Centre National de la Recherche Scientifique
2024-2025
Aix-Marseille Université
2024-2025
Centre de physique des particules de Marseille
2024-2025
Institut National de Physique Nucléaire et de Physique des Particules
2024-2025
Université Grenoble Alpes
2024-2025
Laboratoire de Physique Subatomique et de Cosmologie
2024
Ludwig-Maximilians-Universität München
2024
Austin Peay State University
2024
University of Zurich
2024
We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift $z=0.001$ to 2.26. This work features an increased sample size, span, and improved treatment systematic uncertainties comparison original Pantheon results a factor two improvement constraining power. For Flat$\Lambda$CDM model, we find $\Omega_M=0.334\pm0.018$ SNe alone. Flat$w_0$CDM measure $w_0=-0.90\pm0.14$ alone, H$_0=73.5\pm1.1$...
ABSTRACT We measure the current expansion rate of Universe, Hubble’s constant $H_0$, by calibrating absolute magnitudes supernovae to distances measured baryon acoustic oscillations (BAO). This ‘inverse distance ladder’ technique provides an alternative using nearby measurements, replacing calibration with a high-redshift anchor. use recent release 1829 from Dark Energy Survey spanning $0.01\lt z\lt 1.13$ anchored oscillation measurements Spectroscopic Instrument (DESI) $0.30 \lt...
Abstract We present the results of prompt optical follow-up electromagnetic counterpart gravitational-wave event GW170817 by Transient Optical Robotic Observatory South Collaboration. detected highly significant dimming in light curves ( mag, mag) over course only 80 minutes observations obtained ∼35 hr after trigger with T80-South telescope. A second epoch observations, ∼59 EABA 1.5 m telescope, confirms fast fading nature transient. The observed colors suggest that this was a “blue...
We present the full Hubble diagram of photometrically-classified Type Ia supernovae (SNe Ia) from Dark Energy Survey supernova program (DES-SN). DES-SN discovered more than 20,000 SN candidates and obtained spectroscopic redshifts 7,000 host galaxies. Based on light-curve quality, we select 1635 photometrically-identified SNe with redshift 0.10$< z <$1.13, which is largest sample any single survey increases number known $z>0.5$ by a factor five. In companion paper, cosmological results...
ABSTRACT We report constraints on a variety of non-standard cosmological models using the full 5-yr photometrically classified type Ia supernova sample from Dark Energy Survey (DES-SN5YR). Both Akaike Information Criterion (AIC) and Suspiciousness calculations find no strong evidence for or against any we explore. When combined with external probes, AIC agree that 11 15 are moderately preferred over Flat-$\Lambda$CDM suggesting additional flexibility in our may be required beyond constant....
Abstract We present the full Hubble diagram of photometrically classified Type Ia supernovae (SNe Ia) from Dark Energy Survey supernova program (DES-SN). DES-SN discovered more than 20,000 SN candidates and obtained spectroscopic redshifts 7000 host galaxies. Based on light-curve quality, we select 1635 identified SNe with redshift 0.10 < z 1.13, which is largest sample any single survey increases number known > 0.5 by a factor 5. In companion paper, cosmological results combined 194...
Abstract The Vera Rubin Observatory Legacy Survey of Space and Time (LSST) is expected to process ∼10 6 transient detections per night. For precision measurements cosmological parameters rates, it critical understand the detection efficiency, magnitude limits, artifact contamination levels, biases in selection photometry. Here we rigorously test LSST Difference Image Analysis (DIA) pipeline using simulated images from Dark Energy Science Collaboration Data Challenge (DC2) simulation for...
Abstract We present griz photometric light curves for the full 5 yr of Dark Energy Survey Supernova (DES-SN) program, obtained with both forced point-spread function photometry on difference images ( DiffImg ) performed during survey operations, and scene modelling (SMP) search processed after survey. This release contains 31,636 19,706 high-quality SMP curves, latter which contain 1635 photometrically classified SNe that pass cosmology quality cuts. sample spans largest redshift z range...
ABSTRACT Future constraints of cosmological parameters from Type Ia supernovae (SNe Ia) will depend on the use photometric samples, those samples without spectroscopic measurements SNe Ia. There is a growing number analyses that show can be utilized for precision studies with minimal systematic uncertainties. To investigate this claim, we perform first analysis combines two separate SDSS and Pan-STARRS, including low-redshift anchor. We evaluate consistency these find they are consistent...
ABSTRACT We present and validate 20 deg2 of overlapping synthetic imaging surveys representing the full depth Nancy Grace Roman Space Telescope High-Latitude Imaging Survey (HLIS) 5 yr observations Vera C. Rubin Observatory Legacy Time (LSST). The two are summarized, with reference to existing 300 LSST simulated produced as part Dark Energy Science Collaboration (DESC) Data Challenge 2 (DC2). Both observe same DESC DC2 universe. For survey, we simulate for first time fully chromatic images...
Current and future Type Ia Supernova (SN Ia) surveys will need to adopt new approaches classifying SNe obtaining their redshifts without spectra if they wish reach full potential. We present here a novel approach that uses only photometry identify in the 5-year Dark Energy Survey (DES) dataset using SuperNNova classifier. Our approach, which does not rely on any information from SN host-galaxy, recovers might otherwise be lost due lack of an identifiable host. select 2,298 high-quality DES...
We present $griz$ photometric light curves for the full 5 years of Dark Energy Survey Supernova program (DES-SN), obtained with both forced Point Spread Function (PSF) photometry on Difference Images (DIFFIMG) performed during survey operations, and Scene Modelling Photometry (SMP) search images processed after survey. This release contains $31,636$ DIFFIMG $19,706$ high-quality SMP curves, latter which $1635$ photometrically-classified supernovae that pass cosmology quality cuts. sample...
Abstract Using 1533 type Ia supernovae (SNe Ia) from the five-year sample of Dark Energy Survey (DES), we investigate relationship between projected galactocentric separation SNe and their host galaxies light curves standardization. We show, for first time, that difference in SN post-standardization brightnesses high low-mass hosts reduces 0.078 ± 0.011 mag full to 0.036 0.018 located outer regions galaxies, while increasing 0.100 0.014 inner regions. The size mass step is 0.064 0.023 mag....
While the sample of optical Type Ia Supernova (SN Ia) light curves (LCs) usable for cosmological parameter measurements surpasses 2000, published, cosmologically viable near-infrared (NIR) SN LCs, which have been shown to be good "standard candles," is still $\lesssim$ 200. Here, we present high-quality NIR LCs 83 SNe ranging from $0.002 < z 0.09$ as a part Dark Energy, H$_0$, and peculiar Velocities using Infrared Light Supernovae (DEHVILS) survey. Observations are taken UKIRT's WFCAM,...
The residuals of the distance moduli Type Ia supernovae (SN Ia) relative to a Hubble diagram fit contain information about inhomogeneity universe, due weak lensing magnification by foreground matter. By correlating Dark Energy Survey Year 5 SN sample (DES-SN5YR) with extra-galactic foregrounds from DES Y3 Gold catalog, we detect presence at $6.0 \sigma$ significance. This is first detection significance level above $5\sigma$. Constraints on effective mass-to-light ratios and radial profiles...
Abstract We evaluate the performance of Legacy Survey Space and Time Science Pipelines Difference Image Analysis (DIA) on simulated images. By adding synthetic sources to galaxies images, we trace recovery injected pipeline images from Dark Energy Collaboration Data Challenge 2. The performs well, with efficiency flux accuracy consistent signal-to-noise ratio input explore different spatial degrees freedom for Alard–Lupton polynomial-Gaussian image subtraction kernel analyze trade-offs in...
Wavelength-dependent atmospheric effects impact photometric supernova flux measurements for ground-based observations. We present corrections on from the Dark Energy Survey Supernova Program's 5YR sample (DES-SN5YR) differential chromatic refraction (DCR) and wavelength-dependent seeing, we show their cosmological parameters $w$ $\Omega_m$. use $g-i$ colors of Type Ia supernovae (SNe Ia) to quantify astrometric offsets caused by DCR simulate point spread functions (PSFs) using GalSIM package...
ABSTRACT We present a precise measurement of cosmological time dilation using the light curves 1504 Type Ia supernovae from Dark Energy Survey spanning redshift range $0.1\lesssim z\lesssim 1.2$. find that width supernova is proportional to $(1+z)$, as expected for due expansion Universe. Assuming are emitted with consistent duration $\Delta t_{\rm em}$, and parametrizing observed obs}=\Delta em}(1+z)^b$, we fit form two methods. First, power $b \approx 1$ minimizes flux scatter in stacked...
The Vera C. Rubin Observatory's Legacy Survey of Space and Time is forecast to collect a large sample Type Ia supernovae (SNe Ia) that could be instrumental in unveiling the nature Dark Energy. feat, however, requires measuring two components Hubble diagram - distance modulus redshift with high degree accuracy. Distance estimated from SNe parameters extracted light curve fits, where average quality curves primarily driven by survey such as cadence number visits per band. An optimal observing...
We present the results of optical follow-up conducted by TOROS collaboration first gravitational-wave event GW150914. unfiltered CCD observations (0.35-1 micron) with 1.5-m telescope at Bosque Alegre starting ~2.5 days after alarm. Given our limited field view (~100 square arcmin), we targeted 14 nearby galaxies that were observable from site and located within area higher localization probability. analyzed using two independent implementations difference-imaging algorithms, followed a...