A5051939013- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Galaxies: Formation, Evolution, Phenomena
- Dark Matter and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Quantum Chromodynamics and Particle Interactions
- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Radiation Detection and Scintillator Technologies
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Computational Physics and Python Applications
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Scientific Research and Discoveries
- History and Developments in Astronomy
- Particle Accelerators and Free-Electron Lasers
Centre de physique des particules de Marseille
2016-2025
Aix-Marseille Université
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Tsinghua University
2015-2024
Hebei University
2024
Institut National de Physique Nucléaire et de Physique des Particules
2009-2024
Southwest University
2024
Institut de Recherche sur les Lois Fondamentales de l'Univers
2023
National Institute of Information and Communications Technology
2018
Yale University
2015
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...
(ABRIDGED) We show that Type Ia supernovae (SNe Ia) are formed within both very young and old stellar populations, with observed rates depend on the mass mean star-formation (SFRs) of their host galaxies. Models where SN rate depends solely galaxy ruled out 99% confidence. Our analysis is based 100 spectroscopically-confirmed SNe Ia, plus 24 photometrically-classified events, all from Supernova Legacy Survey (SNLS) distributed over 0.2
We present photometric and spectroscopic observations of SN 2007if, an overluminous (MV = −20.4), red (B − V 0.16 at B-band maximum), slow-rising (trise 24 days) type Ia supernova (SN Ia) in a very faint (Mg −14.10) host galaxy. A spectrum 5 days past maximum light is direct match to the super-Chandrasekhar-mass candidate 2003fg, showing Si ii C ∼9000 km s−1. high signal-to-noise co-addition spectral time series reveals no Na i D absorption, suggesting negligible reddening galaxy, late-time...
Previously we used the Nearby Supernova Factory sample to show that Type Ia supernovae (SNe Ia) having locally star-forming environments are dimmer than SNe passive environments. Here use Constitution together with host galaxy data from GALEX independently confirm result. The effect is seen using both SALT2 and MLCS2k2 lightcurve fitting standardization methods, brightness differences of 0.094 ± 0.037 mag for 0.155 0.041 RV = 2.5. When combined our previous measurement 0.025 SALT2. If ratio...
As part of an on-going effort to identify, understand and correct for astrophysics biases in the standardization Type Ia supernovae (SNIa) cosmology, we have statistically classified a large sample nearby SNeIa into those located predominantly younger or older environments. This classification is based on specific star formation rate measured within projected distance 1kpc from each SN location (LsSFR). important refinement compared using local directly as it provides normalization relative...
Abstract We present the final data from Sloan Digital Sky Survey (SDSS) Reverberation Mapping (RM) project, a precursor to SDSS-V Black Hole Mapper RM program. This set includes 11 yr photometric and 7 spectroscopic light curves for 849 broad-line quasars over redshift range of 0.1 < z 4.5 luminosity L bol = 10 44−47.5 erg s −1 , along with spectral variability measurements. report 23, 81, 125, 110 lags (relative optical continuum variability) broad H α β Mg ii C iv using SDSS-RM sample,...
The nearby supernova SN 2011fe can be observed in unprecedented detail. Therefore, it is an important test case for Type Ia (SN Ia) models, which may bring us closer to understanding the physical nature of these objects. Here, we explore how available and expected future observations used constrain explosion scenarios. We base our discussion on three-dimensional simulations a delayed detonation Chandrasekhar-mass white dwarf violent merger two dwarfs-realizations models appropriate most...
We present 32 epochs of optical (3300-9700 \AA) spectrophotometric observations the nearby quintessential "normal" type Ia supernova (SN Ia) SN 2011fe in galaxy M101, extending from -15 to +97 d with respect B-band maximum, obtained by Nearby Supernova Factory collaboration. is closest (\mu = 29.04) and brightest (Bmax 9.94 mag) observed since advent modern large scale programs for intensive periodic followup supernovae. Both synthetic light curve measurements spectral feature analysis...
We present extensive photometry at ultraviolet (UV), optical, and near-infrared (NIR) wavelengths, as well dense sampling of optical spectra, for the normal type Ia supernova (SN Ia) 2005cf. From well-sampled light curves, we find that SN 2005cf reached a B-band maximum 13.63+/-0.02 mag, with an observed luminosity decline rate dm_15(B) = 1.05+/-0.03 mag. The correlations between various color indexes, recalibrated on basis expanded sample, yielded E(B-V)_host=0.09+/-0.03 mag SN2005cf. UV...
We examine the relationship between Type Ia supernova (SN Ia) Hubble residuals and properties of their host galaxies using a sample 115 SNe from Nearby Supernova Factory. use galaxy stellar masses specific star formation rates fitted photometry for all hosts, as well gas-phase metallicities subset 69 star-forming (non-active galactic nucleus) to show that SN correlate with each these properties. With data we find new evidence correlation intrinsic color metallicity. When combine our those...
Reverberation mapping (RM) measurements of broad-line region (BLR) lags in z>0.3 quasars are important for directly measuring black hole masses these distant objects, but so far there have been limited attempts and success given the practical difficulties RM this regime. Here we report preliminary results 15 BLR lag from Sloan Digital Sky Survey Mapping (SDSS-RM) project, a dedicated program with multi-object spectroscopy designed over wide redshift range. The based on 2014 spectroscopic...
We present a sample of normal Type Ia supernovae (SNe Ia) from the Nearby Supernova Factory data set with spectrophotometry at sufficiently late phases to estimate ejected mass using bolometric light curve. measure 56Ni masses peak luminosity, then compare luminosity in 56Co-decay tail expected rate radioactive energy release ejecta given mass. infer Bayesian context semi-analytic model ejecta, incorporating constraints contemporary numerical models as priors on density structure and...
The Sloan Digital Sky Survey Reverberation Mapping project (SDSS-RM) is a dedicated multi-object RM experiment that has spectroscopically monitored sample of 849 broad-line quasars in single 7 deg$^2$ field with the SDSS-III BOSS spectrograph. quasar flux-limited to i_psf=21.7 mag, and covers redshift range 0.1<z<4.5. Optical spectroscopy was performed during 2014 Jan-Jul dark/grey time, an average cadence ~4 days, totaling more than 30 epochs. Supporting photometric monitoring g i bands...
(Abridged) We study the host galaxy regions in close proximity to Type Ia supernovae (SNe Ia) analyze relations between properties of SN events and environments most similar where their progenitors formed. focus on local H\alpha\ emission as an indicator young environments. The Nearby Supernova Factory has obtained flux-calibrated spectral timeseries for SNe using integral field spectroscopy, allowing simultaneous measurement its immediate vicinity. For 89 we measure tracing ongoing star...
We produce 1000 realizations of synthetic clustering catalogues for each type the tracers used baryon acoustic oscillation and redshift space distortion analysis Sloan Digital Sky Surveys-IV extended Baryon Oscillation Spectroscopic Survey final data release (eBOSS DR16), covering range from 0.6 to 2.2, provide reliable estimates covariance matrices test robustness pipeline with respect observational systematics. By extending Zel'dovich approximation density field an effective tracer bias...
Quasar emission lines are often shifted from the systemic velocity due to various dynamical and radiative processes in line-emitting region. The level of these shifts depends both on line species quasar properties. We study for peaks narrow broad relative using a sample 849 quasars Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project. coadded (from 32 epochs) spectra individual have sufficient signal-to-noise ratio (SNR) measure stellar absorption provide reliable estimates, as...
We present a science forecast for the extended Baryon Oscillation Spectroscopic Survey (eBOSS) survey. Focusing on discrete tracers, we expected accuracy of baryonic acoustic oscillation (BAO), redshift-space distortion (RSD) measurements, fNL parameter quantifying primordial non-Gaussianity, dark energy and modified gravity parameters. also use line-of-sight clustering in Lyman α forest to constrain total neutrino mass. find that eBOSS luminous red galaxies, emission line galaxies quasars...
We construct cosmic void catalogues with the DIVE finder upon SDSS BOSS DR12 and eBOSS DR16 galaxy samples BAO reconstruction applied, perform a joint analysis using different types of galaxies corresponding voids. The peak is evident for galaxy-galaxy, galaxy-void, void-void correlation functions all datasets, including ones cross correlating luminous red emission line samples. Two multi-tracer fitting schemes are then tested, one combining weight applied to voids, other single dilation...
We use the newly released 182 Type Ia supernova data combined with third-year Wilkinson Microwave Anisotropic Probe (WMAP3) and large scale structure (LSS) information including SDSS 2dFGRS to constrain dark energy equation of state (EoS) as well curvature universe $Ω_K$. Using full dataset Cosmic Background (CMB) LSS rather than shift parameter linear growth factor, we make a Markov Chain Monte Carlo (MCMC) global fit, while paying particular attention perturbation. Parameterizing EoS...
We employ 76 type Ia supernovae with optical spectrophotometry within 2.5 days of B-band maximum light obtained by the Nearby Supernova Factory to derive impact Si and Ca features on intrinsic luminosity determine a dust reddening law. use equivalent width II {\lambda}4131 in place curve stretch account for first-order variability. The resultant empirical spectral law exhibits strong associated {\lambda}6355. After applying correction based H&K we find consistent Cardelli extinction Using...
We present a new atmospheric extinction curve for Mauna Kea spanning 3200--9700 \AA. It is the most comprehensive to date, being based on some 4285 standard star spectra obtained 478 nights spread over period of 7 years by Nearby SuperNova Factory using Integral Field Spectrograph. This mean and its dispersion can be used as an aid in calibrating spectroscopic or imaging data from Kea, estimating calibration uncertainty associated with use curve. Our method decomposing into physical...
We present a new method to standardize type Ia supernova (SN Ia) luminosities 0.13 mag using flux ratios from single flux-calibrated spectrum per SN. Using Nearby Supernova Factory spectrophotomery of 58 SNe Ia, we performed an unbiased search for that correlate with SN luminosity. After developing the and selecting best training sample, verified results on separate validation sample data literature. identified multiple whose correlations luminosity are stronger than those light curve shape...