Characterization of the TESS young transiting planets with GAPS release_g3xgyxgw7vb5jfrrsk6p443z3a

Abstract

The GAPS project gathers a large part of the Italian community working on exoplanets. One of our aims is the search for young exoplanets with HARPS-N at TNG, since they are the key targets to study the early evolution of planetary systems and to understand the origin of their observed diversity. The TESS space mission is deeply changing our view of young planets at close separations and provides robust candidates that we are following-up within GAPS and other dedicated programs. We analyzed the HARPS-N RV data of TOI-942 (age 30-80 Myr) as well as the TESS light curve, which allowed us to validate the candidate and detect an additional transiting planet. TOI-942 b and c are both hot-Neptunes, with a period of 4 and 10 days, respectively. This is the youngest multi-planet system identified by TESS so far. We also measured a mass upper limit for the 40 Myr old planet DS Tuc A b (TOI-200) indicating a very low density for this Neptune-size planet. We also modelled the Rossiter-McLaughlin effect with ESPRESSO data showing that the orbit is not completely aligned and simulated the effects of photoevaporation on the planet's atmosphere. Other works are in preparation for the validation and characterization of additional young TOIs.
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