Institute of Astronomy

Moving beyond stellar activity limitations to detect other Earths

SpeakerTalk DateTalk Series
Nadege Meunier, Grenoble13 February 2020Institute of Astronomy Colloquia

Abstract

Stellar variability strongly affects radial measurements and as a consequence limits the detectability and mass characterisation of low mass planets with radial velocity techniques. After introducing this challenge, I will present the stellar processes affecting radial velocity measurements at various temporal scales and the approach we have developed: we have used our very good knowledge of solar activity to build a large amount of realistic synthetic time series for other solar-type stars. I will show how this approach allowed us to understand better the limitations, leading us to propose a new mitigating method and to estimate the performance of Earth-like planet in the habitable zone detections.

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