Claude Mack (AIP)

Do some host stars ingest their rocky planets?
Wann Am 01.10.2015 von 14:30 bis 15:30
  • Kolloquium
Wo SH Lecture Hall
Termin übernehmen vCal / iCal

Stars with close-in giant planets may be more likely to ingest their inner rocky planets. Numerical simulations of giant planet migration suggest that migrating giant planets may disrupt the orbits of interior rocky planets by either ejecting them from the system, scattering them to the outer regions of the system, or by scattering them in towards the host star.

My talk will present the current progress of an ongoing project that seeks to detect a potential chemical signature of rocky planet ingestion by studying the detailed chemical abundances of host stars with wide binary companions. A wide binary companion allows us to compare the chemical abundances of the host star with those of a star that most likely formed at the same time and from the same material. Furthermore, we have performed a simple back-of-the-envelope calculation for how the ingestion of Earth-like rocky planets would affect the photospheric abundances of a Sun-like star. Therefore, we can compare any difference we detect between the chemical abundances of the host star and its companion with the differences predicted by our model, and thereby determine how likely it is that the host star has ingested a significant amount of rocky planetary material.