14 juin - 17 juin 2016


S05 R��union des utilisateurs des t��lescopes fran��ais (TBL/OHP193)

SOPHIE at the era of low mass planets

Bastien Courcol

Thanks to the continuous improvements of detection techniques, the list of known exoplanets has significantly increased the past twenty years. More specifically new types of planets in the low mass domain, from rocky Super-Earths to gaseous Neptunes, have emerged from both high precision radial velocity surveys and space based surveys. The exploration of this population, its properties, diversity and formation processes has become the objective of many upcoming space missions such as TESS and PLATO. It will significantly increase the demande for high precision radial velocity (RV) measurements in the next years.

To contribute to this effort of characterization of low mass planets, the SOPHIE spectrograph, located on the 1.93-m telescope at the OHP, has been improved in June 2011 with the implementation of octagonal-section fibers. With new corrections of instrumental systematics, the RV precision is now of 2 m/s on all timescales.

I will present the first results of a program carried out for several years on SOPHIE that aims at detecting low mass planets and measuring their parameters. I will also discuss these results in the context of the Neptune to Super-Earth transition, especially regarding host star metallicity. Finally, I will present the synergy of our SOPHIE programs with the incoming CHEOPS mission as well as some ongoing improvements of SOPHIE to ultimately reach the 1m/s precision.