SMuK 2023 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 14: Astrophysics: Stellar Astrophysics
EP 14.3: Vortrag
Freitag, 24. März 2023, 11:45–12:00, HSZ/0004
Super-kilonovae from Massive Collapsars as Signatures of Black Hole Birth in the Pair-instability Mass Gap — Daniel Siegel1,2, •Aman Agarwal1,2, Jennifer Barnes3, Brian Metzger3, Mathieu Renzo3, and Ashley Villar3 — 1Perimeter Institute for Theoretical Physics, Waterloo, Ontario, N2L 2Y5, Canada — 2Institute of Physics, University of Greifswald, D-17489 Greifswald, Germany — 3Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA
The core collapse of rapidly rotating massive ~ 10 solar masses stars (collapsars), and the resulting formation of hyperaccreting black holes, comprise a leading model for the central engines of long-duration gamma-ray bursts (GRBs) and promising sources of r-process nucleosynthesis. Here, I will discuss the signatures of collapsars from progenitors with helium cores >~ 130Me above the pair-instability mass gap. The disk outflows can potentially generate a large quantity (up to >~ 50 solar masses) of ejecta, comprised of >~ 5-10 solar masses in r-process elements. Radioactive heating of the disk wind ejecta powers an optical/IR transient, with a characteristic luminosity ~ 10^42 erg/s and a spectral peak similar to kilonovae from neutron star mergers, but with longer durations >~1 month. These super-kilonovae herald the birth of massive black holes >~ 60Me and can populate the pair-instability mass gap from above. SuperKNe could be discovered through planned telescopes like Roman Space Telescope. Multiband gravitational waves of ~ 0.1-50 Hz from these systems are potentially detectable by proposed observatories out to hundreds of Mpc.