Sun, Space Weather, and Solar-Stellar Connection

Session

Stellar Activity as a Limiting Factor for Characterising Exoplanets

Jan 23, 2025, 3:30 PM

18. Stellar Activity as a Limiting Factor for the Discovery and Characterisation of Exoplanets

Ignasi Ribas (Institut d'Estudis Espacials de Catalunya (IEEC) & Institut de Ciències de l'Espai (ICE, CSIC))

1/23/25, 3:30 PM

Invited review talk

Extreme-precision radial velocity (RV) instruments (e.g., ESPRESSO), offering 10 cm s${}^{–1}$ stability, and space telescopes (e.g., JWST), attaining relative flux uncertainties of 10 ppm, are becoming a reality. Such precision is, in principle, sufficient to enable the discovery and characterisation of small rocky planets, including true Earth analogues. However, the intrinsic variability of...

94. Magnetospheric Dynamics and Atmospheric Mass Loss Driven by Solar-Stellar Winds and Storms

Sakshi Gupta (Indian Institute of Science Education and Research Kolkata)

1/23/25, 3:55 PM

Contributed talk

Coronal Mass Ejections (CMEs) are massive eruptions of supersonic magnetized plasma from stellar atmospheres. They create adverse space weather conditions around (exo)planets and can significantly perturb their environment. We investigate how varying ICME characteristics — such as speed, orientation, and magnetic field strength — affect the global dynamics, atmospheric mass loss rates and...

178. Magnetic Interaction of Stellar Coronal Mass Ejections with Close-In Exoplanets

Gopal Hazra (IIT Kanpur)

1/23/25, 4:10 PM

Invited talk

Coronal Mass Ejections (CMEs) erupting from the host star are expected to have enormous effects on the atmospheric erosion processes of the orbiting planets. For planets with a magnetosphere, the embedded magnetic field in the CMEs is thought to be the most important parameter to affect planetary mass loss. In this work, we investigate the effect of different magnetic field structures of...

97. Star Planet Interaction from Solar System to Exoplanets

Arghyadeep Paul (CEA Paris Saclay)

The interaction between stellar winds and planetary magnetospheres has been a focus of research for decades. Within the heliospheric context, star-planet interactions similar to that between the Sun and the Earth reshapes the planet’s local magnetic environment leading to the formation of magnetospheres. In the context of exoplanetary systems, star-planet interactions vary depending on the...