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:
- What can we learn from observed star-planet interactions?
- How can the detailed knowledge acquired by the solar system community be applied in the case of hot exosystems?
- How to better disentangle star-planet interactions signals from stellar activity in the stellar spectra?
- Moira Jardine
- Melodie Kao
- Evgenya Shkolnik
Programme: Tuesday afternoon (5 July 2022)
- 14:00 Moira Jardine (invited) - "Present theoretical understanding of star-planet interactions"
- 14:30 Stephane Mathis - "How do tidally excited internal gravity waves contribute to the rotational evolution and chemical mixing of low-mass stars hosting planets?"
- 14:45 Susana Barros - "Cheops reveals the tidal deformation of WASP-103b"
- 15:00 Evgenya Shkonlik (invited) - "Observational signatures of star-planet interactions"
- 15:30 Colin Folsom - "Stellar magnetic fields for star-planet interactions: HD 219134 and 55 Cnc"
- 15:45 Antonio Maggio - "XUV Irradiation of Young Exoplanetary Atmospheres - Two study cases"
- 16:00 Coffee Break + posters
- 16:30 Melodie Kao (invited) - "Perspectives on the radio observations of star-planet interactions"
- 17:00 Jake Turner - "Multi-site follow-up observations of the first possible exoplanet radio detection"
- 17:15 J. Sebastian Pineda - "Coherent Radio Burst from M-dwarf Hosting Short-period Planet"
- 17:30 Camilla Pezzotti - "Dynamical tides and stellar high-energy irradiation: how the rotational history of the host star shapes the evolution of TOI-849b"
- 17:45 Colombo Salvatore - "Effects of Coronal Mass Ejections on Hot Jupiter Atmosphere"
- 18:00 Posters
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- Antoine Strugarek (DAp-AIM, CEA Paris-Saclay, France)
- Rim Fares (United Arab Emirates University, UAE)
- Aline Vidotto (Leiden Observatory, Netherlands)