A5089412998- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Big Data Technologies and Applications
- Adaptive optics and wavefront sensing
- Superconducting Materials and Applications
- Italy: Economic History and Contemporary Issues
- Geophysics and Gravity Measurements
- Advanced Image Processing Techniques
- Space Science and Extraterrestrial Life
- Solar and Space Plasma Dynamics
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Medical Imaging Techniques and Applications
- History and Developments in Astronomy
- Atomic and Subatomic Physics Research
Institut de Physique des 2 Infinis de Lyon
2024-2025
Duke University
2020-2025
Institute of Nuclear Physics of Lyon
2024-2025
Université Claude Bernard Lyon 1
2024
Centre National de la Recherche Scientifique
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$_0=73.5\pm1.1$...
Here we present 1701 light curves of 1550 spectroscopically confirmed Type Ia supernovae (SNe Ia) that will be used to infer cosmological parameters as part the Pantheon+ SN analysis and SH0ES (Supernovae H0 for Equation State dark energy) distance-ladder analysis. This effort is one a series works perform an extensive review redshifts, peculiar velocities, photometric calibration, intrinsic-scatter models SNe Ia. The total number curves, which are compiled across 18 different surveys,...
Context. As type Ia supernova cosmology transitions from a statistics-dominated to systematics-dominated era, it is crucial understand the remaining unexplained uncertainties that affect their luminosity, such as those stemming astrophysical biases. Type supernovae are standardisable candles whose absolute magnitude reaches scatter of typically 0.15 mag when empirical correlations with light-curve stretch and colour environmental properties accounted for. Aims. We investigate dependence...
Context. Type Ia supernova (SN Ia) cosmology studies will soon be dominated by systematic, uncertainties, rather than statistical ones. Thus, it is crucial to understand the unknown phenomena potentially affecting their luminosity that may remain, such as astrophysical biases. For accurate application in studies, SN magnitudes need standardised; namely, they must corrected for correlation with light-curve width and colour. Aims. Here, we investigate how standardisation procedure used reduce...
Context. The unprecedented statistics of detected Type Ia supernovae (SNe Ia) brought by the Zwicky Transient Facility (ZTF) enable us to probe impact large-scale structure (LSS) on properties these objects. Aims. goal this paper is explore possible under-dense part LSS intrinsic SALT2 light-curve SNe and uncover biases in SN analyses. Methods. With a volume-limited selection ZTF-Cosmo-DR2 overlapping with SDSS-DR7 survey footprint, we investigated distribution their regard voids galaxy...
Abstract Separating the components of redshift due to expansion and peculiar motion in nearby universe ( z < 0.1) is critical for using Type Ia Supernovae (SNe Ia) measure Hubble constant H 0 ) equation-of-state parameter dark energy w ). Here, we study two dominant “motions” contributing velocities: large-scale, coherent-flow (CF) motions small-scale gravitationally associated galaxies deemed be a galaxy group. We use set 584 low- SNe from Pantheon+ sample, evaluate efficacy corrections...
Abstract Recent studies have shown that the observed color distributions of Type Ia supernovae (SNe Ia) can be well described by a combination dust distribution and an intrinsic distribution. Using Pantheon+ sample 1701 SN Ia, we apply new forward-modeling fitting method (Dust2Dust) to measure parent distributions, including their dependence on host-galaxy mass. At each fit step, selection efficiency is determined from large simulated reweighted reflect proposed distributions. We use five...
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 For the past decade, SALT2 has been most common model used to fit Type Ia supernova (SN Ia) light curves for dark energy analyses. Recently, SALT3 was released, which upgraded a number of features but not yet measurements energy. Here, we evaluate impact switching from SN cosmology analysis. We train and on an identical training sample 1083 well-calibrated supernovae, ensuring that any differences found come underlying framework. publicly release results this (the SALT ‘surfaces’)....
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...
We use a sample of 809 photometrically classified type Ia supernovae (SNe Ia) discovered by the Dark Energy Survey (DES) along with 40415 field galaxies to calculate rate SNe per galaxy in redshift range $0.2 < z <0.6$. recover known correlation between SN and stellar mass across broad scales $8.5 \leq \log(M_*/\mathrm{M}_{\odot}) 11.25$. find that increases as power-law index $0.63 \pm 0.02$, which is consistent previous work. an empirical model assembly estimate average star-formation...
Recent analyses have found intriguing correlations between the colour ($c$) of type Ia supernovae (SNe Ia) and size their 'mass-step', relationship SN host galaxy stellar mass ($M_\mathrm{stellar}$) Hubble residual, suggest that cause this is dust. Using 675 photometrically-classified SNe from Dark Energy Survey 5-year sample, we study differences in residual for a variety global local environmental properties subsamples split by colour. We find $3\sigma$ difference mass-step when comparing...
Type Ia supernovae (SNe Ia) are used as standardisable candles to measure cosmological distances, but differences remain in their corrected luminosities which display a magnitude step function of host galaxy properties such stellar mass and rest-frame $U-R$ colour. Identifying the cause these steps is key analyses provides insight into SN physics. Here we investigate effects progenitor ages on light curve using galaxy-based forward model that compare Dark Energy Survey 5-year sample. We...
Current and future cosmological analyses with Type Ia Supernovae (SNe Ia) face three critical challenges: i) measuring redshifts from the supernova or its host galaxy; ii) classifying SNe without spectra; iii) accounting for correlations between properties of their galaxies. We present here a novel approach that addresses each challenge. In context Dark Energy Survey (DES), we analyze SNIa sample galaxies in redMaGiC galaxy catalog, selection Luminous Red Galaxies. Photo-$z$ estimates these...
ABSTRACT Type Ia supernovae (SNe Ia) are explosions of white dwarf stars that facilitate exquisite measurements cosmological expansion history, but improvements in accuracy and precision hindered by observational biases. Of particular concern is the apparent difference corrected brightnesses SNe different host galaxy environments. more massive, passive, older environments appear brighter after having been standardized their light-curve properties. The luminosity commonly takes form a step...
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...
Type Ia supernovae (SNe Ia) are a key probe in modern cosmology, as they can be used to measure luminosity distances at gigaparsec scales. Models of their light-curves project heterogeneous observed data onto common basis for analysis. The SALT model currently SN cosmology describes SNe having two sources variability, accounted by color parameter c, and "stretch parameter" x1. We extend the include an additional we label x2, investigate cosmological impact unaddressed light-curve...
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....
Cosmological analyses of samples photometrically-identified Type Ia supernovae (SNe Ia) depend on understanding the effects 'contamination' from core-collapse and peculiar SN events. We employ a rigorous analysis state-of-the-art simulations photometrically identified determine cosmological biases due to such 'non-Ia' contamination in Dark Energy Survey (DES) 5-year sample. As part analysis, we test our DES performance SuperNNova, photometric classifier based recurrent neural networks....
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,...
Abstract While many studies have shown a correlation between properties of the light curves SNe Ia and their host galaxies, it remains unclear what is driving these correlations. We introduce new direct method to study correlations by analyzing “parent” galaxies that multiple “siblings.” Here, we search Dark Energy Survey SN sample, one largest samples discovered SNe, find eight hosted two likely Ia. Comparing light-curve recovered distances from curves, no better agreement in same galaxy as...