Dr. Siyi Xu, Gemini Observatory
When
3:30 – 4:30 p.m., April 11, 2019
Where
Steward Observatory N210
Abstract: Planetary systems are prevalent around main sequence stars but little is known about their fate beyond the main sequence. In this talk, I will show different evidence that planetary systems can be present and active around white dwarfs. The best example is WD 1145+017, a white dwarf with an actively disintegrating asteroid. I will discuss some recent developments for this system and how it challenges our view about white dwarf planetary systems. I will also discuss new opportunities enabled by current all-sky surveys, including Gaia, Pan-Starrs, WISE, and TESS.