A5011435988- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Toxoplasma gondii Research Studies
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Spectroscopy Techniques in Biomedical and Chemical Research
- Herpesvirus Infections and Treatments
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Metabolism and Genetic Disorders
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
Institut de Physique des 2 Infinis de Lyon
2024-2025
Institute of Nuclear Physics of Lyon
2024-2025
Centre National de la Recherche Scientifique
2023
Université Claude Bernard Lyon 1
2023
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...
ı tre diagram is a key tool for addressing observational systematics, such as the Malmquist bias. As distance modulus of SNe Ia derived from fit their light curves, robust simulation framework required. In this paper, we present performances skysurvey with aim to reproduce Zwicky Transient Facility (ZTF) SN DR2, which covers first phase ZTF and ran March 2018 December 2020. The DR2 sample corresponds almost 3000 classified cosmological quality. We simulated individual curves confirm validity...
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...
In this study, we explore the characteristics of `low-mass' (log( ≤ 8) and `intermediate-mass' (8 $<$ log( 10) host galaxies Type Ia supernovae (SNe Ia) from second data release (DR2) Zwicky Transient Facility survey. We investigated their correlations with different sub-types SNe Ia. used photospheric velocities measured feature, SALT2 light-curve stretch (x_1), host-galaxy properties to re-investigate existing relationship between galaxy mass velocities. also sub-type preferences for...
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...
The Zwicky Transient Facility SN Ia Data Release 2 provides a perfect opportunity to perform thorough search for and subsequent analysis of high-velocity features (HVFs) in the pre-peak regime. source such remains unclear, but potential origins include circumstellar material, as well enhancements abundances or densities intrinsic supernova (SN) ejecta. Therefore, they may provide clues elusive progenitor explosion scenarios Type SNe (SNe Ia). We employed Markov chain Monte Carlo fitting...
Understanding the impact of astrophysical environment on Type Ia supernova (SN Ia) properties is crucial to minimize systematic uncertainties in cosmological analyses based this probe. We investigate dependence SN SALT2.4 light-curve stretch distance from their nearest galaxy cluster study potential effect intracluster medium (ICM) intrinsic Ia. used largest sample date and cross-matched it with existing X-ray, Sunyaev-Zel'dovich, optical catalogs order relation between detected each modeled...
The Zwicky Transient Facility SN Ia Data Release 2 (ZTF DR2) contains more than 3,000 Type supernovae (SNe Ia), providing the largest homogeneous low-redshift sample of SNe Ia. Having at least one spectrum per event, this data collection is ideal for large-scale statistical studies photometric, spectroscopic and host-galaxy properties Ia, particularly rarer `peculiar' sub-classes. In paper we first present method developed to spectroscopically classify in sample, techniques used model their...
Measurements of the growth rate structures at $z < 0.1$ with peculiar velocity surveys have potential testing validity general relativity on cosmic scales. In this work, we present growth-rate measurements from realistic simulated sets type-Ia supernovae (SNe Ia) Zwicky Transient Facility (ZTF). We describe our simulation methodology, light-curve fitting and estimation. Using maximum likelihood method, derive constraints $f\sigma_8$ using only ZTF SN Ia velocities. carefully tested method...
As Type Ia supernova cosmology transitions from a statistics dominated to systematics era, it is crucial understand leftover unexplained uncertainties affecting their luminosity, such as the ones stemming astrophysical biases. Indeed, SNe are standardisable candles, whose absolute magnitude reach 0.15~mag scatter once empirical correlations with lightcurve stretch and colour environment accounted for. In this paper, we investigate how standardisation process of depends on environment,...
Context. Type Ia supernova (SNIa) are excellent probes of local distance and the growing sample sizes SNIa have driven an increased propensity to study associated systematic uncertainties improve standardisation methods in preparation for next generation cosmological surveys into dark energy equation state, w . Aims. We aim probe potential change parameter, c , with redshift host-galaxy supernova. Improving brightness measurements will require relationship between host be accounted for. In...
We present the first homogeneous release of several thousand Type Ia supernovae (SNe Ia), all having spectroscopic classification, and redshifts for half sample. This release, named "DR2", contains 3628 nearby (z < 0.3) SNe discovered, followed classified by Zwicky Transient Facility survey between March 2018 December 2020. Of these, 3000 have good-to-excellent sampling 2667 pass standard cosmology light-curve quality cuts. is thus largest SN to date, increasing an order magnitude number...
Type Ia supernova (SN Ia) cosmology relies on the estimation of light-curve parameters to derive precision distances, which are used infer cosmological such as H 0 , Ω M Λ and w . The empirical SALT2 modeling that only two parameters, a stretch x 1 color c has been by community for almost decades. We study ability model fit nearly 3000 cosmology-grade SN light curves from second release Zwicky Transient Facility (ZTF) science working group. While ZTF data were not train SALT2, algorithm...
The second data release of Type Ia supernovae (SNe Ia) observed by the Zwicky Transient Facility has provided a homogeneous sample 3628 SNe with photometric and spectral information. This unprecedented size enables us to better explore our currently tentative understanding dependence host environment on SN properties. In this paper, we make use two-dimensional image decomposition model galaxies Ia. We elliptical as well disc spiral or without central bulges bars. allows for categorisation...
Type Ia supernova (SN Ia) cosmology relies on the estimation of lightcurve parameters to derive precision distances that leads cosmological parameters. The empirical SALT2 modeling only two parameters, a stretch x1, and color c, has been used by community for almost decades. In this paper we study ability model fit nearly 3000 cosmology-grade SN lightcurves from second release Zwicky Transient Facility (ZTF) science working group. While ZTF data was not train SALT2, algorithm is optical...
The unprecedented statistics of detected Type Ia supernovae (SNe Ia) brought by the Zwicky Transient Facility enables us to probe impact Large-Scale Structure on properties these objects. goal this paper is explore possible under-dense part large-scale structure intrinsic SALT2 light curve SNe and uncover biases in SN analyses. With a volume-limited selection ZTF-Cosmo-DR2 overlapping with SDSS-DR7 survey footprint, we investigate distribution their regard voids galaxy sample. We further use...
Type Ia supernova (SN Ia) light curves have a secondary maximum that exists in the $r$, $i$, and near-infrared filters. The is relatively weak $r$ band, but holds advantage it accessible, even at high redshift. We used Gaussian Process fitting to parameterise of 893 SNe from Zwicky Transient Facility's (ZTF) second data release (DR2), we were able extract information about timing strength maximum. found $>5\sigma$ correlations between curve decline rate ($\Delta m_{15}(g)$) band. Whilst $i$...
More than 3000 spectroscopically confirmed Type Ia supernovae (SNe Ia) are presented in the Zwicky Transient Facility SN Data Release 2 (ZTF DR2). In this paper, we detail spectral properties of 482 SNe near maximum light, up to a redshift limit $z$ $\leq$ 0.06. We measure velocities and pseudo-equivalent widths (pEW) key features (Si II $\lambda$5972 Si $\lambda$6355) investigate relation between photometric from SALT2 light-curve parameters as function spectroscopic sub-class. discuss...
Type Ia supernovae ( are used to determine the distance-redshift relation and build Hubble diagram. Neglecting their host-galaxy peculiar velocities (PVs) may bias measurement of cosmological parameters. The smaller redshift, larger effect is. We realistic simulations observed by Zwicky Transient Facility (ZTF) investigate different methods taking PVs into account. studied impact neglecting galaxy correlations in an analysis find that it is necessary use PV full covariance matrix computed...
Type Ia supernova (SN Ia) light curves have a secondary maximum that exists in the $r$, $i$, and near-infrared filters. The is relatively weak $r$ band, but holds advantage it accessible, even at high redshift. We used Gaussian process fitting to parameterise of 893 SNe from Zwicky Transient Facility's (ZTF) second data release (DR2), we were able extract information about timing strength maximum. found $>5 correlations between curve dec rate ($ (g)$) band. Whilst $i$ band also correlated...