| Name: | Saugata Barat |
| Affiliation: | University of Amsterdam |
| Conference ID: | ASI2025_345 |
| Title: | First observations of young transiting planet atmospheres: Uncovering signatures of early evolution |
| Authors: | Saugata Barat, Jean-Michel Desert |
| Authors Affiliation: | University of Amsterdam |
| Mode of Presentation: | Oral |
| Abstract Category: | Sun, Solar System, Exoplanets, and Astrobiology |
| Abstract: | Transiting planets younger than 100 million years offer a unique opportunity to catch freshly baked products of planet formation which are undergoing early evolution. We present first ever atmospheric characterization results for two young (20-30 Myr old) transiting planets (V1298 Tau b and c) using HST (published). We will also unveil the JWST transmission spectrum of V1298 Tau b (submitted ApJ). We will present novel methods to estimate the planet mass directly from the transmission spectrum, which has proven to be critical for young transiting planets where radial velocities are challenging due to stellar activity induced jitter. We will compare the mass and atmospheric composition of the two young transiting planets with their mature counterparts as well as with each other to interpret our findings in the context of early atmospheric evolution. We will also present the first constraints on internal entropy of a transiting exoplanet from our observations and compare with planet formation and evolution models. Ultimately, we will discuss theoretical evolutionary models currently being developed which can reconcile the observed mass, composition and internal entropy of these young transiting planets with the mature exoplanet population |
