P. Astier
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View article: Special Section Guest Editorial: Image Sensors for Precision Astronomy
Special Section Guest Editorial: Image Sensors for Precision Astronomy Open
International audience
View article: Development of an unbiased cosmic shear estimator measured on galaxy images
Development of an unbiased cosmic shear estimator measured on galaxy images Open
Since cosmic shear was first observed in 2000, it has become a key cosmological probe and promises to deliver exquisite dark energy constraints. However, shear is inferred from coherent distortions of galaxy shapes, and the relation betwee…
View article: LSST Camera focal plane optimization
LSST Camera focal plane optimization Open
Proceedings of the SPIE SPIE Astronomical Telescopes + Instrumentation conference 16-22 JUNE 2024
View article: LSST camera verification testing and characterization
LSST camera verification testing and characterization Open
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan
View article: PlatoSim: an end-to-end PLATO camera simulator for modelling high-precision space-based photometry
PlatoSim: an end-to-end PLATO camera simulator for modelling high-precision space-based photometry Open
Context. PLAnetary Transits and Oscillations of stars (PLATO) is the ESA M3 space mission dedicated to detect and characterise transiting exoplanets including information from the asteroseismic properties of their stellar hosts. The uninte…
View article: PlatoSim: An end-to-end PLATO camera simulator for modelling high-precision space-based photometry
PlatoSim: An end-to-end PLATO camera simulator for modelling high-precision space-based photometry Open
PLAnetary Transits and Oscillations of stars (PLATO) is the ESA M3 space mission dedicated to detect and characterise transiting exoplanets including information from the asteroseismic properties of their stellar hosts. The uninterrupted a…
View article: Correction of the brighter-fatter effect on the CCDs of Hyper Suprime-Cam
Correction of the brighter-fatter effect on the CCDs of Hyper Suprime-Cam Open
The brighter-fatter effect affects all CCD sensors to various degrees. Deep-depleted thick sensors are seriously affected and the measurement of galaxy shapes for cosmic shear measurements requires an accurate correction of the effect in s…
View article: Solar Orbiter/RPW antenna calibration in the radio domain and its application to type III burst observations
Solar Orbiter/RPW antenna calibration in the radio domain and its application to type III burst observations Open
Context. In order to allow for a comparison with the measurements from other antenna systems, the voltage power spectral density measured by the Radio and Plasma waves receiver (RPW) on board Solar Orbiter needs to be converted into physic…
View article: Impact of Point Spread Function Higher Moments Error on Weak\n Gravitational Lensing
Impact of Point Spread Function Higher Moments Error on Weak\n Gravitational Lensing Open
Weak gravitational lensing is one of the most powerful tools for cosmology,\nwhile subject to challenges in quantifying subtle systematic biases. The Point\nSpread Function (PSF) can cause biases in weak lensing shear inference when the\nP…
View article: Improving the astrometric solution of the Hyper Suprime-Cam with anisotropic Gaussian processes
Improving the astrometric solution of the Hyper Suprime-Cam with anisotropic Gaussian processes Open
Context. We study astrometric residuals from a simultaneous fit of Hyper Suprime-Cam images. Aims. We aim to characterize these residuals and study the extent to which they are dominated by atmospheric contributions for bright sources. Met…
View article: Peculiar velocity cosmology with type Ia supernovae
Peculiar velocity cosmology with type Ia supernovae Open
Type Ia Supernovae have yet again the opportunity to revolutionize the field of cosmology as the new generation of surveys are acquiring thousands of nearby SNeIa opening a new era in cosmology: the direct measurement of the growth of stru…
View article: The shape of the photon transfer curve of CCD sensors
The shape of the photon transfer curve of CCD sensors Open
The photon transfer curve (PTC) of a CCD depicts the variance of uniform images as a function of their average. It is now well established that the variance is not proportional to the average, as Poisson statistics would indicate, but rath…
View article: The ESO’s VLT type Ia supernova spectral set of the final two years of SNLS
The ESO’s VLT type Ia supernova spectral set of the final two years of SNLS Open
Aims. We aim to present 70 spectra of 68 new high-redshift type Ia supernovae (SNe Ia) measured at ESO’s VLT during the final two years of operation (2006–2008) of the Supernova Legacy Survey (SNLS). This new sample complements the VLT thr…
View article: Distances to supernovae: an efficient probe of dark energy
Distances to supernovae: an efficient probe of dark energy Open
Measuring distances to supernovae (or more precisely to the "type Ia" subclass) has allowed us to measure the distance-redshift relation beyond linear order for the first time in 1998.These first results already showed strong evidence for …
View article: High fidelity point-spread function retrieval in the presence of electrostatic, hysteretic pixel response
High fidelity point-spread function retrieval in the presence of electrostatic, hysteretic pixel response Open
We employ electrostatic conversion drift calculations to match CCD pixel\nsignal covariances observed in flat field exposures acquired using candidate\nsensor devices for the LSST Camera. We thus constrain pixel geometry\ndistortions prese…
View article: RAPIDLY RISING TRANSIENTS IN THE SUPERNOVA—SUPERLUMINOUS SUPERNOVA GAP
RAPIDLY RISING TRANSIENTS IN THE SUPERNOVA—SUPERLUMINOUS SUPERNOVA GAP Open
We present observations of four rapidly rising ( t rise ≈ 10 days) transients with peak luminosities between those of supernovae (SNe) and superluminous SNe ( M peak ≈ −20)—one discovered and followed by the Palomar Transient Factory (PTF)…
View article: The Effect Of Progenitor Age And Metallicity On Luminosity And Ni-56 Yield In Type Ia Supernovae
The Effect Of Progenitor Age And Metallicity On Luminosity And Ni-56 Yield In Type Ia Supernovae Open
Timmes et al. found that metallicity variations could theoretically account for a 25% variation in the mass of Ni-56 synthesized in Type Ia supernovae (SNe Ia), and thus account for a large fraction of the scatter in observed SN Ia luminos…
View article: The DICE calibration project Design, characterization, and first results
The DICE calibration project Design, characterization, and first results Open
Aims. We describe the design, operation, and first results of a photometric calibration project, called DICE (Direct Illumination Calibration Experiment), aiming at achieving precise instrumental calibration of optical telescopes. The hear…
View article: An introduction to some imperfections of CCD sensors
An introduction to some imperfections of CCD sensors Open
CCD sensors do not deliver a perfect image of the light they receive. Beyond the well known linear image smearing due to diffusion of charges during their drift towards the pixel wells, non-linear effects are at play in these sensors. We n…