Astronomy & Astrophysics Seminar: Hidden Jets in Core Collapse Supernovae
Moshe Eisenberg, TAU (MSc Thesis Talk - half-seminar length)
Core Collapse Supernovae are extremely energetic quasi spherical explosions that are triggered by the core collapse of massive stars. Long Gamma Ray Bursts are also extremely energetic events caused by the collapse of a massive stellar core which leads to the formation of a narrowly collimated relativistic jet. Although evidence of the association between LGRBs and CCSNe has been known for at least two decades, the relation between the mechanisms of these two phenomena is still not well understood. An old theory, suggesting that relativistic jets have an important role in CCSNe explosions, has received significant support lately with claims that many CCSNe of progenitors that lost most of their hydrogen envelope, show the observational signature of high velocity outflow in their ejecta, possibly caused by relativistic jets. In this work, we examine the kinetic energy distribution of outflow from jet-driven stellar explosions, and the relevant parameters required for describing it. Our goal is to examine what type of explosion (jetted, spherical or both) can explain the observed kinetic energy distribution seen in the ejecta of many stripped envelope SNe. We find that jet driven explosions have a very unique distribution of kinetic energy that cannot mimic this of a spherical explosion, or vice versa and that this distribution is inconsistent with the observations. In addition, we show that a combined case of both spherical explosion and relativistic jet may indeed be the cause for those CCSNe with high velocity component, suggesting that jets are more common in CCSNe than we originally thought, but that they are not the main energy source in these explosions.
Seminar Organizer: Dr. Iair Arcavi