Young planets are ideal targets to test planet formation/evolution scenarios since they likely preserve the primordial information before being affected by post processes (e.g., photoevaporation). Planets younger than 100 Myr are known to have larger radii than their older counterparts, which could be ascribed to the evolution of planetary envelopes. Mass measurements for those youngest planets are the key to uncovering the physical processes and timescale of exoplanet evolution, but there are only a handful of young planets (<100 Myr), whose radii and masses were both available. As part of our new Doppler Observation Campaign for Transiting Objects around Rookie stars (“DOCTORs"), we request to observe two infant transiting planets (K2-33b and HIP67522b) with IRD. In the near IR, RV jitter are suppressed by a factor of 2−3 compared to that in the visible, and IRD’s broadband spectroscopy (covering Y, J, H bands simultaneously) also provides a unique opportunity to disentangle RV jitters from true planetary signals and establish a “diagnosis" for stellar activity. Making additional (∼ 20) RV measurements for each target, we will obtain tight constraints on the mass and bulk composition for the two youngest planets.
This document was translated from LATEX by HEVEA.