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Type of talk
Mr. Priyankush Ghosh
Date and Time of Talk

Over the last three decades, we have been able to discover all kinds of strange planets we never knew existed, having no analog in our solar system. Super-Earths can be up to 10 times more massive than Earth with a wide variety of planetary compositions. However, we don’t yet know enough about these planets. This presentation aims to explore the atmospheric physics and chemistry of 55 Cancri e, an ultra-short period super-Earth. Evidence suggests that it has a high mean molecular weight atmosphere, and the talk will focus on (i) Nitrogen and Sulfur chemistry and (ii) Outgassing chemistry. I will introduce our state-of-the-art forward model of exoplanet atmospheres, which combines the radiative-convective equilibrium model with melt-vapor equilibrium and photo-chemical kinetics. This model is used to constrain atmospheric physics, such as temperature-pressure profiles, and atmospheric chemistry, such as chemical abundances. I will also present the simulated transmission and emission spectra of 55 Cancri e's atmosphere, varying in different initial elemental abundances, along with the observability of the spectra using JWST. Finally, I will conclude by discussing about our ongoing observations at 3.6 m DOT using TANSPEC for transit spectroscopic study of exoplanet XO-2N b, and at 1.3 m DFOT for transit photometric study of the exoplanets WASP-77 A b and K2-28 b.

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About Speaker

The speaker is a PhD student in NISER working on exo-planet.

Email Host
Host Name
Yogesh Joshi
Host Phone (ext/mob)