Speaker
Description
The progenitor mass and central engine of a core-collapse supernova (CC-SNe) continue to be a mystery despite the modern surveys of the transient universe. A multi-messenger approach including both EM and gravitational-waves, however, provides a unique window to break the degeneracy between a newly born neutron star and black hole central engines of CC-SNe. Considering the 160Mpc horizon distance to BH central engines, here we apply such approach to the nearby event SN 2023ixf. Over the observation window proceeding the first discovery of SN 2023ixf, our results show no joint H1-L1 signal associated with the birth of rotating BH central engine. Together with photometric-spectroscopic data, we interpret this null result to indicate the absence of BH formation. This outcome, instead, supports the birth of a NS central engine, therefore progenitor mass less than $20M_\odot$.