Angular momentum role in the hypercritical accretion of binary-driven hypernovae

Journal Article · Mon Oct 12 00:00:00 EDT 2015 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.1088/0004-637X/812/2/100· OSTI ID:1329681

Becerra, L. ^[1]; Cipolletta, F. ^[1]; Fryer, Chris L. ^[2]; Rueda, Jorge A. ^[3]; Ruffini, Remo ^[3]

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1. Sapienza Univ. di Roma, Rome (Italy); ICRANet, Pescara (Italy)
2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
3. Sapienza Univ. di Roma, Rome (Italy); ICRANet, Pescara (Italy); ICRANet-Rio, Rio de Janeiro (Brazil)

Here, the induced gravitational collapse paradigm explains a class of energetic, $${E}_{{\rm{iso}}}\gtrsim {10}^{52}$$ erg, long-duration gamma-ray bursts (GRBs) associated with Ic supernovae, recently named binary-driven hypernovae. The progenitor is a tight binary system formed of a carbon–oxygen (CO) core and a neutron star (NS) companion. The supernova ejecta of the exploding CO core trigger a hypercritical accretion process onto the NS, which reaches the critical mass in a few seconds, and gravitationally collapses to a black hole, emitting a GRB. In our previous simulations of this process, we adopted a spherically symmetric approximation to compute the features of the hypercritical accretion process. We here present the first estimates of the angular momentum transported by the supernova ejecta, $${L}_{{\rm{acc}}},$$ and perform numerical simulations of the angular momentum transfer to the NS during the hyperaccretion process in full general relativity. We show that the NS (1) reaches either the mass-shedding limit or the secular axisymmetric instability in a few seconds depending on its initial mass, (2) reaches a maximum dimensionless angular momentum value, $${[{cJ}/({{GM}}^{2})]}_{{\rm{max}}}\approx 0.7$$, and (3) can support less angular momentum than the one transported by supernova ejecta, $${L}_{{\rm{acc}}}\gt {J}_{{\rm{NS,max}}},$$ hence there is an angular momentum excess that necessarily leads to jetted emission.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-06NA25396
• OSTI ID: 1329681
• Report Number(s): LA-UR-15-23118
• Journal Information: The Astrophysical Journal (Online), Vol. 812, Issue 2; ISSN 1538-4357
• Publisher: Institute of Physics (IOP)
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
astronomy and astrophysics
gamma-ray burst: general