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Accueil > Thèses, Stages, Formation et Enseignement > Propositions de thèses 2023 > First LSST dataset : toward the next generation of cosmological constrains.

First LSST dataset : toward the next generation of cosmological constrains.

par Tristan Beau - 9 novembre 2022

Titre : First LSST dataset : toward the next generation of cosmological constrains.

Directrice/directeur de thèse : Pierre Antilogus

Groupe d’accueil :Groupe de Cosmologie du LPNHE

Webpage du projet :

Collaboration : LSST

Description :

The telescope of the V.Rubin Observatory is a wide field 8m class telescope that will see its 1rst light mid-2023 in Chile. It will play an unique role in observational cosmology through its Legacy Space and Time Survey (LSST), which corresponds to a continuous deep full sky survey running for 10 years, starting late 2024.

The LPNHE cosmology group is involved in key projects to study the Dark Energy . The group plays a central role in the usage of the Supernova Ia (SNIa) in cosmology. For LSST it is also involved on the weak lensing cosmological probe and for DESI in the BAO probe. The evolution toward a multi-probes approach is the rule with the current new generation of cosmological projects (LSST, Euclid, DESI) to provide the best cosmological constrains.

The group is working since 2007 on the preparation of LSST trough key contributions to its camera, namely its focal plane and lter exchange.

The thesis will benefit of the V.Rubin Observatory first light and camera commissioning combined with the first LSST data. The proposed thesis work will cover two aspects :

  • It will have a strong focus on the camera and survey commissioning. The LSST focal plane is the largest existing focal plane (201 CCD for a total number of pixels of 3,2·10^9 and a eld of view of 9.6 deg² 40 times the apparent surface of the moon). The requested precision for the LSST science implies a precise understanding of the instrumental signature removal of its sensors. This will be a key for the LSST success, in particular for CCD effects impacting the shape and ux measurements, both quantities being at the core of the cosmological probes measurements . Using commissioning data the PhD student will work on these effects with the support of the LPNHE group which has a strong expertise on sensor. A direct contribution in Chile to the commissioning may imply 2-3 months stay on site during the PhD.
  • Using his/her knowledge obtained during the commissioning phase, the PhD student will contribute to the rst cosmological analyses within the LPNHE group. The focus will be on the systematics to the cosmological probes (SNIa vs ux biases , weak lensing vs shape biases), induced by the CCD instrumental signature removal applied.

Lieu(x) de travail : LPNHE

Déplacements éventuels : Chili et USA

Stage proposé avant la thèse : Oui


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