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Heating from Electron Captures by Nuclei in Magnetar Crusts

Published online by Cambridge University Press:  27 February 2023

Nicolas Chamel Open the ORCID record for Nicolas Chamel [Opens in a new window] ,
Anthea Francesca Fantina ,
Lami Suleiman ,
Julian-Leszek Zdunik  and
Pawel Haensel
Nicolas Chamel
Affiliation:
Institute of Astronomy and Astrophysics, Université Libre de Bruxelles, CP 226, Boulevard du Triomphe, B-1050 Brussels, Belgium email: [email protected]
Anthea Francesca Fantina
Affiliation:
Institute of Astronomy and Astrophysics, Université Libre de Bruxelles, CP 226, Boulevard du Triomphe, B-1050 Brussels, Belgium email: [email protected] Grand Accélérateur National d’Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Boulevard Henri Becquerel, 14076 Caen, France email: [email protected]
Lami Suleiman
Affiliation:
N. Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, PL-00-716 Warszawa, Poland emails [email protected] (L.S.); [email protected] (J.-L. Z.); [email protected] (P.H.) Laboratoire Univers et Théories, Observatoire de Paris, Université PSL, Université de Paris, CNRS, F-92195 Meudon, France
Julian-Leszek Zdunik
Affiliation:
N. Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, PL-00-716 Warszawa, Poland emails [email protected] (L.S.); [email protected] (J.-L. Z.); [email protected] (P.H.)
Pawel Haensel
Affiliation:
N. Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, PL-00-716 Warszawa, Poland emails [email protected] (L.S.); [email protected] (J.-L. Z.); [email protected] (P.H.)
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Abstract

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The decay of the magnetic field in the interior of a magnetar may trigger electron captures by nuclei in the stellar crust, thus providing an internal source of heating. In turn, the onset of electron captures and the heat released are altered by the magnetic field due to the Landau–Rabi quantization of electron motion. The loss of magnetic pressure might also lead to pycnonuclear fusions of the lightest elements. The maximum amount of heat that can be possibly released by each reaction and their location are calculated using nuclear data from both experiments and theoretical predictions of the Brussels-Montreal models based on self-consistent Hartree-Fock-Bogoliubov calculations. Results are found to be consistent with those inferred empirically by comparing neutron-star cooling simulations with observed thermal luminosity of soft gamma-ray repeaters and anomalous X-ray pulsars.

Keywords

stars: neutronstars: magnetic fieldsnuclear reactions
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S363: Neutron Star Astrophysics at the Crossroads: Magnetars and the Multimessenger Revolution , June 2020 , pp. 305 - 308
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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