The MICROSCOPE space mission, launched on April 25, 2016, aims to test the weak equivalence principle (WEP) with a 1015 precision. To reach this performance requires an accurate and robust data analysis method, especially since the possible WEP violation signal will be dominated by a strongly colored noise. An important complication is brought by the fact that some values will be missing –therefore, the measured time series will not be strictly regularly sampled. Those missing values induce a spectral leakage that significantly increases the noise in Fourier space, where the WEP violation signal is looked for, thereby complicating scientific returns.
Recently, we developed an inpainting algorithm to correct the MICROSCOPE data for missing values (in red, fig 4). This code has been integrated in the official MICROSCOPE data processing and analysis pipeline because it enables us to significantly measure an equivalence principle violation (EPV) signal in a model-independent way, in the inertial satellite configuration. In this work, we present several improvements to the method that may allow us now to reach the MICROSCOPE requirements for both inertial and spin satellite configurations (green curve, fig. 4).
The code ICON
The code corresponding to the paper is available for download here.
Although, the inpainting method presented in this paper has been optimized to the MICROSCOPE data, it remains sufficiently general to be used in the general context of missing data in time series dominated by an unknown colored-noise.
Dealing with missing data in the MICROSCOPE space mission: An adaptation of inpainting to handle colored-noise data, S. Pires, J. Bergé, Q. Baghi, P. Touboul, G. Métris, accepted in Physical Review D, December 2016
Dealing with missing data: An inpainting application to the MICROSCOPE space mission, J. Bergé, S. Pires, Q. Baghi, P. Touboul, G. Metris, Physical Review D, 92, 11, December 2015
Our beautiful radio-interferometry reconstructed image, using a method based on Compressed Sensing Theory, has been highlighted by the Square Kilometre Array (SKA) project:.
Soutenance de thèse du Service d’Astrophysique, Mardi 18 Octobre – 14h00
FRED NGOLE MBOULA
METHODES ET ALGORITHMES AVANCES POUR L'IMAGERIE ASTRONOMIQUE DE HAUTE PRECISION
Soutenance de thèse du Service d’Astrophysique, Mercredi 28 Septembre – 14h00
COSMOLOGY WITH WEAK-LENSING PEAK COUNTS
On the day of the Brexit outcome, so disastrous for Europe and the UK, there is at least good news for the cosmological community: CFIS, the Canada-France Imaging Survey, has been accepted! This survey consists of two parts. The WIQD(Wide Image Quality Deep) part will cover 5,000 deg2 of the Northern sky, observed in the r-band with the CFHT (Canada-France Hawai'i telescope). The u-band will cover 10,000 deg2 to a lower depth, and is part of LUAU (Legacy for the U-band All-sky Universe). 271 nights are granted, observations will start in 8 months from now.
CFIS will allow us to study properties of dark-matter structures, including filaments between galaxy clusters and groups, stripping of dark-matter halos of satellite galaxies in clusters, and the shapes of dark-matter halos. In addition, the laws of gravity on large scales will be tested, and modifications to Einstein's theory of general relativity will be looked for. CFIS will observe a very large number of distant, high-redshift galaxies, and will use techniques of galaxy clustering and weak gravitational lensing to achieve its goals.
In addition, CFIS will create synergie with other ongoing and planned surveys: CFIS will provide ground-based optical data for Euclid photometric-redshifts. It will produce a very useful imaging data set for target selection for spectroscopic surveys such as DESI, WEAVE, and MSE. It will further provide optical data of galaxy clusters that will enhance the science outcome of the X-ray mission eRosita.
PIs: Jean-Charles Cuillandre (CEA Saclay/France) & Alan McConnachie (Victoria/Canada).
CosmoStat participants: Martin Kilbinger, Jean-Luc Starck. Sandrine Pires.
Irfu participants: Monique Arnaud, Hervé Aussel, Olivier Boulade, Pierre-Alain Duc, David Elbaz, Christophe Magneville, Yannick Mellier, Marguerite Pierre, Anand Raichoor, Jim Rich, Vanina Ruhlmann-Kleider, Marc Sauvage, Christophe Yèche.
Titre: LA SCIENCE DES FUTURS GRANDS RELEVÉS COSMOLOGIQUES
Dates: 22 au 27 août 2016
Lieu: Narbonne, France
Site web: https://euclid-school16.
aux problématiques des grands relevés cosmologiques appropriés aux scientifiques qui
s'impliquent fortement dans le projet Euclid comme dans les autres grands projets dédiés
à l'étude de l'énergie noire.
* Clustering des galaxies (Francis Bernardeau, Olivier LeFèvre, Stéphanie Escoffier)
* Lentillage gravitationnel (Martin Kilbinger)
* Amas de galaxies (Alain Blanchard)
Les cours sont complémentés par des TD.
We are glad to announce the release of the outreach video "Dessine ta thèse" (means "Draw your thesis" in French) on youtube. This episodes focuses on gravitational lensing and involves the participation of the CosmoStat member Chieh-An Lin.
Both French and English subtitles are available!
Cécile Chenot, who is pursuing a PhD at the LCS in signal processing, has been selected to participate to the prestigious 66th Lindau Nobel laureate meeting this summer.