GB5 - GRBs and the Afterglow |
|
Speaker |
Pisani, Giovanni Battista |
|
Coauthors |
Ruffini, Remo; Bianco, Carlo Luciano; Enderli, Maxime; Izzo, Luca; Kovacevic, Milos; Muccino, Marco; Penacchioni, Ana Virginia; Rueda Hernandez, Jorge Armando; Wang, Yu; Zaninoni, Elena |
| Talk Title |
Properties Of The X-Ray Afterglow Of Binary-Driven Hypernovae |
|
Abstract |
One of our major recent results is the discovery of a striking common behavior in the late X-ray luminosity light curve within a “golden sample” of nearby, energetic (isotropic energy larger than 10^52 ergs), multi-episodic long Gamma-ray Bursts (GRBs) associated with supernovae (SNe): GRB 060729, 061007, 080319B, 090618, 091127, and 111228. This result contributed to the development of the new concept of binary-driven hypernova (BdHN), which progenitor has been proposed to be an evolved and tight binary system composed of a FeCO core and a neutron star (NS). The above-mentioned scaling law showed by the X-ray afterglows has rapidly become a necessary criterium for the BdHN identification, allowing us to predict the SN emergence in the optical band ~ 13 days after the GRB 130427A explosion. We have recently identified the farthest (z = 8.2) GRB 090423 as a BdHN thanks to the overlapping of its X-ray luminosity with the BdHNe ones at late times. This result opens the way for this scaling law to be extended at high redshifts. If confirmed, this would lead to the use of BdHNe as standard candles to test the standard cosmological CDM model. |
|
Talk view |
|
|
|
|