NN Serpentis has everything: a white dwarf + main sequence binary system that is believed to contain two planets and, now, a disc of debris.
Accretion instabilities driving violent outcome of a merging binary, and its observable signatures.
Type Ia supernovae might be arise from single- or double-degenerate progenitor binaries. Today’s papers suggests that single-degenerate progenitors might account for the extremely bright type Ia supernovae.
Sometimes, stellar evolution happens on more human timescales—tens to hundreds of years rather than millions or billions.
Over the past decade the study of planetary debris at white dwarfs has become an increasingly exciting area. Observations of this debris have allowed us to make unique discoveries about the chemical composition of extrasolar rocky planets, as well as revealing the endpoints of the evolution of planetary systems very similar to our own…
This white dwarf is surrounded by a debris disk. What formed the disk, and what’s destroying it now?