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Title: Nuclear Ignition of White Dwarf Stars by Relativistic Encounters with Rotating Intermediate Mass Black Holes

Abstract

We present results from general relativistic calculations of nuclear ignition in white dwarf stars triggered by near encounters with rotating intermediate mass black holes with different spin and alignment parameters. These encounters create thermonuclear environments characteristic of Type Ia supernovae capable of producing both calcium and iron-group elements in arbitrary ratios, depending primarily on the proximity of the interaction which acts as a strong moderator of nucleosynthesis. Here, we explore the effects of black hole spin and spin-orbital alignment on burn-product synthesis to determine whether they might also be capable of moderating reactive flows. When normalized to equivalent impact penetration, accounting for frame-dragging corrections, the influence of spin is weak, no more than 25% as measured by nuclear energy release and mass of burn products, even for near maximally rotating black holes. Stars on prograde trajectories approach closer to the black hole and produce significantly more unbound debris and iron-group elements than is possible by encounters with nonrotating black holes or by retrograde orbits, at more than 50% mass conversion efficiency. The debris contains several radioisotopes, most notably 56Ni, made in amounts that produce subluminous (but still observable) light curves compared to branch-normal SNe Ia.

Authors:
 [1];  [1];  [2];  [1]; ORCiD logo [3]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Columbia Univ., New York, NY (United States)
  3. College of Charleston, Charleston, SC (United States); Univ. of California, Santa Barbara, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1577239
Report Number(s):
LLNL-JRNL-777261
Journal ID: ISSN 1538-4357; 970929; TRN: US2102137
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 885; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Black holes; White dwarfs; Black hole physics; Hydrodynamics; Explosive nucleosynthesis

Citation Formats

Anninos, Peter, Hoffman, Robert D., Grewal, Manvir, Lavell, Michael J., and Fragile, P. Chris. Nuclear Ignition of White Dwarf Stars by Relativistic Encounters with Rotating Intermediate Mass Black Holes. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab4ae0.
Anninos, Peter, Hoffman, Robert D., Grewal, Manvir, Lavell, Michael J., & Fragile, P. Chris. Nuclear Ignition of White Dwarf Stars by Relativistic Encounters with Rotating Intermediate Mass Black Holes. United States. https://doi.org/10.3847/1538-4357/ab4ae0
Anninos, Peter, Hoffman, Robert D., Grewal, Manvir, Lavell, Michael J., and Fragile, P. Chris. Fri . "Nuclear Ignition of White Dwarf Stars by Relativistic Encounters with Rotating Intermediate Mass Black Holes". United States. https://doi.org/10.3847/1538-4357/ab4ae0. https://www.osti.gov/servlets/purl/1577239.
@article{osti_1577239,
title = {Nuclear Ignition of White Dwarf Stars by Relativistic Encounters with Rotating Intermediate Mass Black Holes},
author = {Anninos, Peter and Hoffman, Robert D. and Grewal, Manvir and Lavell, Michael J. and Fragile, P. Chris},
abstractNote = {We present results from general relativistic calculations of nuclear ignition in white dwarf stars triggered by near encounters with rotating intermediate mass black holes with different spin and alignment parameters. These encounters create thermonuclear environments characteristic of Type Ia supernovae capable of producing both calcium and iron-group elements in arbitrary ratios, depending primarily on the proximity of the interaction which acts as a strong moderator of nucleosynthesis. Here, we explore the effects of black hole spin and spin-orbital alignment on burn-product synthesis to determine whether they might also be capable of moderating reactive flows. When normalized to equivalent impact penetration, accounting for frame-dragging corrections, the influence of spin is weak, no more than 25% as measured by nuclear energy release and mass of burn products, even for near maximally rotating black holes. Stars on prograde trajectories approach closer to the black hole and produce significantly more unbound debris and iron-group elements than is possible by encounters with nonrotating black holes or by retrograde orbits, at more than 50% mass conversion efficiency. The debris contains several radioisotopes, most notably 56Ni, made in amounts that produce subluminous (but still observable) light curves compared to branch-normal SNe Ia.},
doi = {10.3847/1538-4357/ab4ae0},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 885,
place = {United States},
year = {2019},
month = {11}
}

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