EAS meeting

The recent EAS meeting in Padova, Italy, was a good opportunity to discuss new scientific collaborations with people who would be otherwise difficult to meet at one place.

Visit at University of Illinois

Camille Landri spent two weeks visiting Dr. Paul Ricker at University of Illinois Urbana-Champaign working on hydrodynamical simulations of common envelope evolution. The trip received support from a student grant of which Camille is a PI.

Driving asymmetric red supergiants winds with binary interactions

New paper by PhD student Camille Landri looks at how we can get asymmetric outflows from red supergiants such as VY CMa and other similar objects. The idea is that a companion coming in on a grazing excentric orbit will unbind a small amount of gas from the red supergiant. This gas is subject to rapid radiative cooling and forms dust, which gets pushed away from the supergiant by its radiative pressure. Radiative cooling and dust driving are necessary to form outflows that are anisotropic in the sense that the ejection happens only in a fraction of a solid angle near the pericenter. After many grazing orbits, the ejections form an asymmetric structure with imprinted spiral-like pattern. The paper (accepted to MNRAS) discusses origin, final fate, and observational implications of this scenario.

Two student grants for our group

Our PhD students were successful in obtaining student grants from the Grant Agency of the Charles University. Camille Landri (with Anthony Kirilov as a co-I) won with a project title The impact of binary evolution on common envelope evolution, and Jakub Cehula will work on Baryon ejection in magnetar giant flares: implications for r-process nucleosynthesis and fast radio bursts. Congratulations!