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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [3];  [4]; ORCiD logo [5];  [6];  [7]
  1. Saint Mary's Univ., Halifax, NS (Canada); Michigan State Univ., East Lansing, MI (United States)
  2. Ohio Univ., Athens, OH (United States)
  3. Michigan State Univ., East Lansing, MI (United States)
  4. Clemson Univ., SC (United States)
  5. GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  6. Louisiana State Univ., Baton Rouge, LA (United States)
  7. Saint Mary's Univ., Halifax, NS (Canada)
Publication Date:
Research Org.:
Ohio Univ., Athens, OH (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); National Aeronautic and Space Administration (NASA)
OSTI Identifier:
1593723
Grant/Contract Number:  
SC0019042; FG02-88ER40387; NA0002847; PHY-1430152; PHY-1102511; NNX17AE32G
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 887; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; X-ray bursts; spallation

Citation Formats

Randhawa, J. S., Meisel, Z., Giuliani, S. A., Schatz, H., Meyer, B. S., Ebinger, K., Hood, A. A., and Kanungo, R. Spallation-altered Accreted Compositions for X-Ray Bursts: Impact on Ignition Conditions and Burst Ashes. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab4f71.
Randhawa, J. S., Meisel, Z., Giuliani, S. A., Schatz, H., Meyer, B. S., Ebinger, K., Hood, A. A., & Kanungo, R. Spallation-altered Accreted Compositions for X-Ray Bursts: Impact on Ignition Conditions and Burst Ashes. United States. doi:10.3847/1538-4357/ab4f71.
Randhawa, J. S., Meisel, Z., Giuliani, S. A., Schatz, H., Meyer, B. S., Ebinger, K., Hood, A. A., and Kanungo, R. Fri . "Spallation-altered Accreted Compositions for X-Ray Bursts: Impact on Ignition Conditions and Burst Ashes". United States. doi:10.3847/1538-4357/ab4f71.
@article{osti_1593723,
title = {Spallation-altered Accreted Compositions for X-Ray Bursts: Impact on Ignition Conditions and Burst Ashes},
author = {Randhawa, J. S. and Meisel, Z. and Giuliani, S. A. and Schatz, H. and Meyer, B. S. and Ebinger, K. and Hood, A. A. and Kanungo, R.},
abstractNote = {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.},
doi = {10.3847/1538-4357/ab4f71},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 887,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
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