Scientific motivation

The interactions of cool stars with their surrounding exoplanets can have various origins: gravitation (tides), magnetism (stellar hot spots), wind-magnetosphere coupling (magnetic reconnection), and irradiation (atmospheric escape). They are expected to leave visible traces in a large part of the electromagnetic spectrum, in X-rays (e.g., stellar hot spots), infrared (evaporation of hot atmospheres), radio (planetary aurorae), among others. It was proposed that interactions influence the architecture of hot exosystems. Their manifestation generally adds up to the stellar spectrum with a non-trivial temporal modulation. When detected, star-planet interactions nevertheless provide a fantastic opportunity to understand stars, their environments (stellar wind particles and magnetic fields), and the plasma properties of exoplanets (magnetic fields and evaporating atmospheric particles).

The firm detection of star-planet interaction signatures is today scarce - the handful systems in which such interactions have been detected are also actively debated in the literature. This splinter session aims to gather experts to discuss different signatures of star-planet interactions and their reliability. Our aim is to identify, as a community, the most promising avenues to characterize them, in order to prepare the research community to leverage the wealth of ground-based and space-based observations that will become available in the coming decade.

In this splinter session, we aim to bring together observers/theoreticians whose diverse research interests are linked to star-planet interactions. We will address the following questions:

Invited Speakers

Programme: Tuesday afternoon (5 July 2022)


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