J. Peloton
A5038783234- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Superconducting and THz Device Technology
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Dark Matter and Cosmic Phenomena
- Advanced Data Storage Technologies
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Scientific Computing and Data Management
- Pulsars and Gravitational Waves Research
- Time Series Analysis and Forecasting
- Cloud Computing and Resource Management
- Particle Accelerators and Free-Electron Lasers
- Adaptive optics and wavefront sensing
- Gaussian Processes and Bayesian Inference
- Advanced Database Systems and Queries
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Data Visualization and Analytics
- Parallel Computing and Optimization Techniques
Centre National de la Recherche Scientifique
2016-2025
Université Paris-Saclay
2018-2025
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2020-2025
Institut National de Physique Nucléaire et de Physique des Particules
2015-2025
University of Minnesota System
2022
Abastumani Astrophysical Observatory
2022
GANIL
2018-2021
University of Sussex
2016-2021
Japan Aerospace Exploration Agency
2020
Université Paris-Sud
2018-2020
This book lays out the scientific goals to be addressed by next-generation ground-based cosmic microwave background experiment, CMB-S4, envisioned consist of dedicated telescopes at South Pole, high Chilean Atacama plateau and possibly a northern hemisphere site, all equipped with new superconducting cameras. CMB-S4 will dramatically advance cosmological studies crossing critical thresholds in search for B-mode polarization signature primordial gravitational waves, determination number...
We report a measurement of the B-mode polarization power spectrum in cosmic microwave background (CMB) using Polarbear experiment Chile. The faint signature carries information about universe's entire history gravitational structure formation, and inflation that may have occurred very early universe. Our covers angular multipole range 500 < ℓ 2100 is based on observations an effective sky area 25 with 35 resolution at 150 GHz. On these scales, lensing CMB by intervening universe expected to...
Distortion of the cosmic microwave background by matter in universe, known as gravitational lensing, is observed POLARBEAR collaboration. The technique used here would allow for all gravitating to be mapped, and provide important corrections detection primordial waves background.
Abstract We report an improved measurement of the cosmic microwave background B -mode polarization power spectrum with Polarbear experiment at 150 GHz. By adding new data collected during second season observations (2013–2014) to re-analyzed from first (2012–2013), we have reduced twofold band-power uncertainties. The band powers are reported over angular multipoles , where dominant signal is expected be due gravitational lensing E -modes. reject null hypothesis no a confidence 3.1 σ...
We constrain anisotropic cosmic birefringence using four-point correlations of even-parity $E$-mode and odd-parity $B$-mode polarization in the microwave background measurements made by POLARization Background Radiation (POLARBEAR) experiment its first season observations. find that signal from any parity-violating processes is consistent with zero. The Faraday rotation can be compared equivalent quantity generated primordial magnetic fields if they existed. POLARBEAR nondetection translates...
A new technique, first performed using the South Pole Telescope, that allows gravitational deflections of cosmic microwave background to be measured from photon polarization, gets further support measurements by POLARBEAR collaboration.
Abstract We describe the simulated sky survey underlying second data challenge (DC2) carried out in preparation for analysis of Vera C. Rubin Observatory Legacy Survey Space and Time (LSST) by LSST Dark Energy Science Collaboration (LSST DESC). Significant connections across multiple science domains will be a hallmark LSST; DC2 program represents unique modeling effort that stresses this interconnectivity way has not been attempted before. This encompasses full end-to-end approach: starting...
SkyPortal is an open-source software package designed to efficiently discover interesting transients, manage follow-up, perform characterization, and visualize the results. By enabling fast access archival catalog data, cross-matching heterogeneous data streams, triggering monitoring of on-demand observations for further a SkyPortal-based platform has been operating at scale 2 yr Zwicky Transient Facility Phase II community, with hundreds users, containing tens millions time-domain sources,...
GRB 221009A is the brightest Gamma-Ray Burst (GRB) detected in more than 50 years of study. In this paper, we present observations X-ray and optical domains after obtained by GRANDMA Collaboration (which includes from 30 professional amateur telescopes) Insight-HXMT Collaboration. We study afterglow with empirical fitting GRANDMA+HXMT data, augmented data literature up to 60 days. then model numerically, using a Bayesian approach, HXMT-LE observations, that augment Swift-XRT additional...
CMB and lensing reconstruction power spectra are powerful probes of cosmology. However, they correlated, since the lensed, is constructed using multipoles. We perform a full analysis auto- cross-covariances, including polarization minimum-variance estimators, compare with simulations idealized future CMB-S4 observations. Covariances sourced by fluctuations in unlensed instrumental noise can largely be removed realization-dependent subtraction noise, leaving relatively simple covariance model...
Fink is a broker designed to enable science with large time-domain alert streams such as the one from upcoming Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). It exhibits traditional astronomy features automatised ingestion, annotation, selection redistribution promising alerts for transient science. also go beyond by providing real-time classification which continuously improved using state-of-the-art Deep Learning Adaptive techniques. These evolving added values will more...
Context. Large sky surveys provide numerous non-targeted observations of small bodies the Solar System. The upcoming LSST Vera C. Rubin Observatory will be largest source body photometry in next decade. With non-coordinated epochs observation, colors – and therefore taxonomy composition can only computed by comparing absolute magnitudes obtained each filter solving phase function (evolution brightness against solar angle). Current models use community ( HG , 12 * 1 G 2 ), however, fail to...
Abstract Current and future surveys rely on machine learning classification to obtain large complete samples of transients. Many these algorithms are restricted by training that contain a limited number spectroscopically confirmed events. Here, we present the first real-time application Active Learning optimise spectroscopic follow-up with goal improving sets early type Ia supernovae (SNe Ia) classifiers. Using photometric classifier for SN Ia, apply an strategy optimisation using FINK...
POLARBEAR-2 (PB-2) is a cosmic microwave background (CMB) polarization experiment that will be located in the Atacama highland Chile at an altitude of 5200 m. Its science goals are to measure CMB signals originating from both primordial gravitational waves and weak lensing. PB-2 designed tensor scalar ratio, r, with precision {\sigma}(r) < 0.01, sum neutrino masses, {\Sigma}m{\nu}, {\sigma}({\Sigma}m{\nu}) 90 meV. To achieve these goals, employ 7588 transition-edge sensor bolometers 95 GHz...
ABSTRACT GRB 230812B is a bright and relatively nearby (z = 0.36) long gamma-ray burst (GRB) that has generated significant interest in the community thus been observed over entire electromagnetic spectrum. We report 80 observations X-ray, ultraviolet, optical, infrared, submillimetre bands from GRANDMA (Global Rapid Advanced Network for Multimessenger Addicts) network of observatories observational partners. Adding complementary data literature, we then derive essential physical parameters...
Using only cosmic microwave background polarization data from the POLARBEAR experiment, we measure $B$-mode delensing on subdegree scales at more than $5\sigma$ significance. We achieve a 14% power variance reduction, highest to date for internal delensing, and improve this result 2% by applying first time an iterative maximum posteriori method. Our analysis demonstrates capability of as means improving constraints inflationary models, paving way optimal next-generation primordial experiments.
The Simons Array is an expansion of the POLARBEAR cosmic microwave background (CMB) polarization experiment currently observing from Atacama Desert in Northern Chile. This will create array three 3.5m telescopes each coupled to a multichroic bolometric receiver. have sensitivity produce ≥ 5σ detection inationary gravitational waves with tensor-to-scalar ratio r 0:01, detect known minimum 58 meV sum neutrino masses 3σ confidence when combined next-generation baryon acoustic oscillation...
We describe how the Fink broker early supernova Ia classifier optimizes its ML classifications by employing an active learning (AL) strategy. demonstrate feasibility of implementation such strategies in current Zwicky Transient Facility (ZTF) public alert data stream. compare performance two AL strategies: uncertainty sampling and random sampling. Our pipeline consists 3 stages: feature extraction, classification Starting from initial sample 10 alerts (5 SN 5 non-Ia), we let algorithm...
Atmosphere is one of the most important noise sources for ground-based cosmic microwave background (CMB) experiments. By increasing optical loading on detectors, it amplifies their effective noise, while its fluctuations introduce spatial and temporal correlations between detected signals. We present a physically motivated 3d-model atmosphere total intensity emission in millimeter sub-millimeter wavelengths. derive new analytical estimate correlation detectors time-ordered data as function...
The Simons Array is a next generation cosmic microwave background (CMB) polarization experiment whose science target precision measurement of the B-mode pattern produced both by inflation and gravitational lensing. As continuation extension successful POLARBEAR experimental program, will consist three cryogenic receivers each featuring multichroic bolometer arrays mounted onto separate 3.5m telescopes. first these, also called POLARBEAR-2A, be to deploy in late 2016 has large diameter focal...
A continuously rotating half-wave plate (CRHWP) is a promising tool to improve the sensitivity large angular scales in cosmic microwave background (CMB) polarization measurements. With CRHWP, single detectors can measure three of Stokes parameters, I, Q and U, thereby avoiding set systematic errors that be introduced by mismatches properties orthogonal detector pairs. We focus on implementation CRHWPs aperture telescopes (i.e. primary mirror larger than current maximum diameter ∼0.5 m),...
Large surveys provide numerous non-targeted observations of small bodies (SSOs). The upcoming LSST the Rubin observatory will be largest source SSO photometry in next decade. With non-coordinated epochs observation, colors, and therefore taxonomy composition, can only computed by comparing absolute magnitudes obtained each filter solving phase function (evolution brightness body against solar angle). Current models use community (HG, HG12* , HG1G2) however fail to reproduce long-term many...