Kavli Affiliate: Shunsaku Horiuchi
| First 5 Authors: Cecilia Lunardini, Cecilia Lunardini, , ,
| Summary:
We present a new, state-of-the-art computation of the Diffuse Supernova
Neutrino Background (DSNB), where we use neutrino spectra from
multi-dimensional, multi-second core collapse supernova simulations – including
both neutron-star and black-hole forming collapses – and binary evolution
effects from modern population synthesis codes. Large sets of numerical results
are processed and connected in a consistent manner, using two key quantities:
the mass of the star’s Carbon-Oxygen (CO) core at an advanced pre-collapse
stage – which depends on binary evolution effects – and the compactness
parameter, which is the main descriptor of the post-collapse neutrino emission.
The method enables us to model the neutrino emission of a very diverse,
binary-affected population of stars, which cannot unambiguously be mapped in
detail by existing core collapse simulations. We find that including black
hole-forming collapses enhances the DSNB by up to 50% at energies greater than
30-40 MeV. Binary evolution effects can change the total rate of collapses and
generate a sub-population of high core mass stars that are stronger neutrino
emitters. However, the net effect on the DSNB is moderate – up to a 15%
increase in flux – due to the rarity of these super-massive cores and to the
relatively modest dependence of the neutrino emission on the CO core mass. The
methodology presented here is suitable for extensions and generalizations, and
therefore it lays the foundation for modern treatments of the DSNB.
| Search Query: ArXiv Query: search_query=au:”Shunsaku Horiuchi”&id_list=&start=0&max_results=3