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Inferring the role of binary neutron star mergers in r-process nucleosynthesis with multi-messenger observations using Cosmic Explorer and Einstein Telescope
Aman Agarwal, Suvodip Mukherjee, Daniel M. Siegel
Identifying the cosmic origin of rapid neutron-capture (r-process) elements remains an open problem. Binary neutron-star (BNS) mergers and rare classes of core-collapse supernovae…
Relativistic jets from millisecond proto-magnetars
Dhruv K. Desai, Luciano Combi, Daniel M. Siegel +1
Rapidly rotating, strongly magnetized neutron stars (``millisecond proto-magnetars'') formed in stellar core-collapse, neutron star mergers, and white dwarf accretion-induced colla…
Jet-driven explosion of an accretion-induced white-dwarf collapse via a magnetorotational dynamo
Luciano Combi, Daniel M. Siegel, Brian D. Metzger
The accretion-induced collapse (AIC) of a rotating white dwarf (WD) offers a potential site of millisecond pulsars/magnetars, gamma-ray bursts, and r-process nucleosynthesis. We pr…
Mergers Fall Short: Non-merger Channels Required for Galactic Heavy Element Production
Muhammed Saleem, Hsin-Yu Chen, Daniel M. Siegel +3
Since the discovery of the binary neutron star merger GW170817 and its associated kilonova, neutron star mergers have been established as a key production channel for r-process ele…
Accretion Regimes of Neutrino-Cooled Flows onto Black Holes
Javiera Hernández-Morales, Daniel M. Siegel
Neutrino-cooled accretion disks can form in the aftermath of neutron-star mergers as well as during the collapse of rapidly rotating massive stars (collapsars) and the accretion-in…
Magnetized Accretion onto Neutron Stars: from Photon-trapped to Neutrino-cooled Flows
Luciano Combi, Christopher Thompson, Daniel M. Siegel +2
When a neutron star (NS) intercepts gas from a non-degenerate star, e.g., in a tidal disruption event, a common-envelope phase, or the collapsing core of a massive star, photons be…
Ignition of weak interactions and r-process outflows in super-collapsar accretion disks
Aman Agarwal, Daniel M. Siegel, Brian D. Metzger +1
The collapse of rotating massive (~) stars resulting in hyperaccreting black holes (BHs; "collapsars") is a leading model for the central engines of long-duration gamma…
Inference of multi-channel r-process element enrichment in the Milky Way using binary neutron star merger observations
Hsin-Yu Chen, Philippe Landry, Jocelyn S. Read +1
Observations of GW170817 strongly suggest that binary neutron star (BNS) mergers produce rapid neutron-capture nucleosynthesis (r-process) elements. However, it remains an open que…