Augmenter la limite de détection des exoplanètes par combinaison optimale d'observations multi-époques en imagerie directe

In Gretsi

Illustration des orbites des exoplanètes HR 8799b, c, d et e estimées par la méthode proposée.


Exoplanets detection by direct imaging remains one of the most challenging field of modern astronomy. The signal of the star can prevent the detection of orbiting companions in single datasets, but combining information from several observations can boost the detection limits. We propose a new algorithm named PACOME, based on PACO’s approach, which optimally combines, in a maximum likelihood sense, multi-epoch datasets and improves the detection sensitivity of potential exoplanets by taking into account their orbital motions. The efficiency of the algorithm is tested on the well-known exoplanetary system HR 8799.