For the last talk of today, we’ve got Tim Cunningham on accreted planetary material determined from #xray observations.
Tim starts with the #exoplanet#HR diagram and points out polluted white dwarfs. Roughly 25-50% of the WD we know show metal pollution. This is expected to be happening when the star dies and kills its planetary system + then accretes the planetary material.
The accretion rates depend on the atmospheric models of WDs. #ExSSV