Spallation-altered Accreted Compositions for X-Ray Bursts: Impact on Ignition Conditions and Burst Ashes

Randhawa, J. S.; Meisel, Z.; Giuliani, S. A.; Schatz, H.; Meyer, B. S.; Ebinger, K.; Hood, A. A.; Kanungo, R.

doi:10.3847/1538-4357/ab4f71

Title: Spallation-altered Accreted Compositions for X-Ray Bursts: Impact on Ignition Conditions and Burst Ashes

Journal Article · 12 December 2019 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/ab4f71 · OSTI ID:1593723

^[1];

^[2]; Giuliani, S. A. ^[3]; Schatz, H. ^[3]; Meyer, B. S. ^[4];

^[5]; Hood, A. A. ^[6]; Kanungo, R. ^[7]

Saint Mary's Univ., Halifax, NS (Canada); Michigan State Univ., East Lansing, MI (United States); Ohio University
Ohio Univ., Athens, OH (United States)
Michigan State Univ., East Lansing, MI (United States)
Clemson Univ., SC (United States)
GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
Louisiana State Univ., Baton Rouge, LA (United States)
Saint Mary's Univ., Halifax, NS (Canada)

Model predictions of X-ray burst ashes and light curves depend on the composition of the material accreted from the companion star, in particular the abundance of CNO elements. It has previously been pointed out that spallation in the atmosphere of the accreting neutron star can destroy heavy elements efficiently. In this work we study this spallation using a realistic reaction network that follows the complete spallation cascade and takes into account not only destruction, but also production of elements by the spallation of heavier species. We find an increased survival probability of heavier elements compared to previous studies, resulting in significantly higher CNO abundances.We provide resulting compositions as a function of accretion rate, and explore their impact on 1D multi-zone X-ray burst models. Finally, we find significant changes in the composition of the burst ashes, which will affect the thermal and compositional structure of accreted neutron star crusts.

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Research Organization:: Michigan State Univ., East Lansing, MI (United States); Ohio Univ., Athens, OH (United States)

Sponsoring Organization:: National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: FG02-88ER40387; NA0002847; NA0003885; SC0019042

OSTI ID:: 1593723

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 887; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Spallation-altered Accreted Compositions for X-Ray Bursts: Impact on Ignition Conditions and Burst Ashes

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