Account
| First Name | Dimitrios |
| Last Name | Kantzas |
| Institution | University of Athens |
| Country | Greece |
1st Abstract
| Title (1st Abstract) | Early time signatures of gamma-ray emission from Supernovae in dense Circumstellar Media |
| First Author | Dimitrios Kantzas |
| Affiliation | University of Athens |
| Additional Authors | Maria Petropoulou / Purdue University |
| Presentation options | |
| Session | 10. SNe and SNRs with circumstellar interactions |
| 1st Abstract | We will present our results on the gamma emission from interaction-powered supernovae (SNe), a recently discovered type of SN suggested to be surrounded by a very dense Circumstellar Medium ($10^5-10^{11}~cm^{-3}$). These high densities favor the production of gamma ray photons through neutral pion decay as well as the photon production due to relativistic bremsstrahlung. Using a numerical code that includes synchrotron radiation, adiabatic losses due to the expansion of the source, relativistic bremsstrahlung, proton-proton collisions and proton-photon interactions, i.e. photopair ($pgamma rightarrow pe^{pm}$) and photopion ($pgamma rightarrow ppi^0, ~pgamma rightarrow ppi^{pm}$) production, we calculate the gamma ray emission ($>100 ~MeV$) soon after shock breakout and follow its temporal evolution until 100-1000 days. We show that both pp collisions and relativistic bremsstrahlung contribute significantly to the gamma ray emission and discuss the potential of detecting such SNe with the Fermi telescope. |
| Abstract File (optional) |
2nd Abstract
| Title (2nd abstract) | The Effect of Circumstellar Medium on Cosmic Ray Acceleration in Type Ia Supernovae |
| First Author (2nd abstract) | D. Kantzas |
| Affiliation (2nd abstract) | University of Athens |
| Additional Authors (2nd abstract) | A. Chiotellis / National Observatory of Athens |
| Presentation options (2nd abstract) | |
| Session (2nd abstract) | 10. SNe and SNRs with circumstellar interactions |
| 2nd Abstract | We present our results on the range and time evolution of the maximum energy that charged particles can obtain while they are accelerated in the forward shock of Supernova Remnants resulting by Type Ia Supernovae (SNe Ia). In particular, based on semi-analytical and numerical descriptions, we investigate the dynamics of a Supernova Remnant evolving in a modified ambient medium formed by the mass outflows of the progenitor system. We associate the ambient medium properties to the suggested diversity of SNe Ia progenitors and we study the effects of such an evolution on the acceleration of cosmic rays. We find that the range and the time evolution of the cosmic rays’ maximum energy are strongly dependent on the ambient medium properties. Thus, combining this result with the predictions of SNe Ia population synthesis, we conclude that the modification of the ambient medium by the SN Ia progenitors cannot be neglected in the study on the origin of galactic cosmic rays. |
| File (optional) (2nd abstract) |