Oral comunication
T. L. Campante
Abstract
The Transiting Exoplanet Survey Satellite (TESS) is currently performing a near all-sky survey for planets that transit bright stars. In addition, its excellent photometric precision will enable asteroseismology of solar-type and red-giant stars. In particular, simulations predict that TESS will detect solar-like oscillations in over 100 solar-type and red-giant stars previously known to host planets, the vast majority of which have been discovered using the radial-velocity (RV) method. In this talk, we present the asteroseismic analysis of the evolved known hosts HD 212771 and HD 203949 (an RGB and a red-clump star, respectively), both systems having a long-period planet detected through RVs. This is the first detection of oscillations in any known exoplanet-host star by TESS, further showcasing the mission's potential to conduct asteroseismology of red-giant stars. We estimate the fundamental properties of each star through a grid-based modeling approach that uses global asteroseismic parameters, complementary spectroscopic data and a parallax-based luminosity as input. With a precise asteroseismic mass in hand, we revise the minimum planetary masses quoted in the literature. Finally, we note that HD 212771 was observed by K2 in short-cadence mode during its Campaign 3, which enabled its asteroseismic investigation. Therefore, this provides a unique opportunity to compare, for the first time, the asteroseismic performances of K2 and TESS.
TASC5/KASC12
Cambridge, Estados Unidos da América
2019 July
