Exoplanet atmospheres

Modelling of atmospheric heating, evolution and loss due to the high energy radiation of the host star. Characterization of atmospheres using transmission and emission spectroscopy. Machine learning and exoplanet atmospheric retrieval. 2021 FGGA Emerging field grant.

credit: ESA/Hubble, M. Kornmesser

Solar and stellar winds

A close-in view of a solar wind simulation (Boro Saikia et al. 2020)

Solar and stellar wind simulations using 3D magnetohydrodynamic models. Ultraviolet spectroscopy as a tool to study coronal heating and wind propagation in cool stars including the Sun.   FWF Lise Meitner project on “Young stellar winds impacting planetary habitability” (2020-2022).

Stellar magnetism and activity

Spectroscopic and spectropolarimetric observations as a tool to study stellar surface magnetic field, and chromospheric and coronal activity in cool main sequence stars. Zeeman Doppler imaging to reconstruct the surface magnetic geometry of cool stars. Machine learning to simulate the high energy XUV radiation of exoplanet host stars.

Reconstruction of the young Sun HN Peg’s surface magnetic geometry (Boro Saikia et al. 2015)