Evolution of Main-Sequence-like Surviving Companions in Type Ia Supernova Remnants
Shiau-Jie Rau (NTHU)
Recent theoretical and numerical studies of Type Ia supernova explosion within the single-degenerate scenario suggest that the non-degenerate companions could survive in the supernova impact and could be detectable in nearby supernova remnants. However, observational efforts show less promising evidence on the existence of surviving companions from the standard single-degenerate channels. By further considering the spin-up/down model, we searched for a vast parameter space of main-sequence-like surviving companions. We found several tight relationships for the surviving companions, and our results suggest that the not-yet detected surviving companions from observations of nearby Type Ia supernova remnants might favor lower mass companions, shorter binary separation, or stronger supernova explosion energies.
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Planetesimal formation in accreting and magnetized laminar protoplanetary disk
Chun-Yen Hsu (ASIAA)
The formation of planetesimals is a critical point in the core accretion theory of planet formation, but it is still not well understood. The streaming instability (SI) is one of the most popular candidates for raising the dust-to-gas ratio in protoplanetary disks (PPDs) to gravitational collapse. The SI is a linear instability in rotating flows of dust and gas when the two components interact through mutual drag and are powered by their relative radial drift, which is usually driven by a global radial pressure gradient that offsets the gas from Keplerian rotation. I will present some possible extended theories from the classical streaming instability.
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