Institute of Astrophysics and Space Sciences, Portugal | 2019 Oct 29
Using asteroseismic data from NASA’s Transiting Exoplanet Survey Satellite (TESS), an international team ... studied the red-giant stars HD 212771 and HD 203949. These are the first detections of oscillations in previously known exoplanet-host stars by TESS. ...TESS in Space ~ Credit: NASA/GSFC
Having determined the physical properties of both stars, such as their mass, size and age, through asteroseismology, the authors then focused their attention on the evolutionary state of HD 203949. Their aim was to understand how its planet could have avoided engulfment, since the envelope of the star would have expanded well beyond the current planetary orbit during the red-giant phase of evolution. ...
By performing extensive numerical simulations, the team thinks that star-planet tides might have brought the planet inward from its original, wider orbit, placing it where we see it today. ...
Revealed: Exoplanet's 'Improbable' Survival
University of Warwick | 2019 Oct 30
TESS Asteroseismology of the Known Red-Giant Host Stars HD 212771 and HD 203949 ~ Tiago L. Campante et al