The Antesonic Condition for the Explosion of Core-Collapse Supernovae by Raives et al.

Matthias Raives et al. studied transition from accretion to explosion in highly idealized setting of the neutrino mechanism of core-collapse supernovae and in relation to the critical neutrino luminosity of Burrows & Goshy (1993) and extending the previous work of Pejcha & Thompson (2012). Interestingly, in order to properly resolve the vicinity of the critical transition, high simulation resolution is needed.

The full paper is available at astro-ph.

 

Expansion of computational cluster

We have been able to expand the Institute computing cluster with one node (2×10 cores), bringing the total core count on new nodes to 80. The node is working fine. Stay tuned for possible further expansions next year!

New node in a shipping box
Unpacked
Institute rack in the computing center in the basement
New node is the top one

 

Pre-explosion spiral mass loss of a binary star merger

Paper with Brian Metzger, Jacob Tyles and Kengo Tomida on the best-studied example of stellar mergers V1309 Sco. We explain the pre-maximum behavior as due to runaway increase of mass loss from the outer Lagrange L2 of a contact binary. The resulting spiral stream initially obscures the binary and modifies the light curve. Then, mass-loss rate is so high that the binary variability disappears and we see only shocks from collision of the spiral arms. We can track mass-loss rate by looking at the luminosity (with some caveats).  When the merger becomes dynamical, the faster more-spherical explosion collides with the previous equatorially-focused mass loss. The resulting shock interaction can power bright second peaks in many similar transients. Continue reading “Pre-explosion spiral mass loss of a binary star merger”