Institute of Astronomy

Hydrodynamic Simulations of the interaction between giant stars and planets

SpeakerTalk DateTalk Series
Jan Staff28 July 2014Across HR 2014 Talks


We show the results of 3 dimensional hydrodynamic simulations of the interaction between AGB or RGB stars with one or two massive planets or a brown dwarf. We aim at understanding the degree of disruption of the star during and after the interaction. The planet is initially at a separation such that the giant fills its Roche lobe, causing mass transfer and soon thereafter, inspiral. Very little gas is unbound in the process, as expected. However, the planet can stir up the outer layers of the star increasing the photospheric radius, before the final plunge at which point the planet can be disrupted. Finally, we show the calculated light curves for these events and comment on the likelihood of observing them.