Radiatively driven evaporation from magnetar's surface

Ivan Demidov, Yuri Lyubarsky

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The luminosity of the Soft Gamma Repeater flares significantly exceeds the Eddington luminosity. This is because they emit mainly in the E mode, for which the radiative cross-sections are strongly suppressed. The energy is released in the magnetosphere forming a magnetically trapped pair fireball, and the surface of the star is illuminated by the powerful radiation from the fireball. We study the ablation of the matter from the surface by this radiation. The E-mode photons are scattered within the surface layer, partly being converted into O-photons, whose scattering cross-section is of the order of the Thomson cross-section. The high radiation pressure of the O-mode radiation expels the plasma upwards. The uplifted matter forms a thick baryon sheath around the fireball. If an illuminated fraction of the star's surface includes the polar cap, a heavy, mildly relativistic baryonic wind is formed.

Original languageEnglish
Pages (from-to)810-820
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume518
Issue number1
DOIs
StatePublished - 1 Jan 2023

Keywords

  • magnetic fields
  • radiative transfer
  • stars: magnetars
  • stars: winds, outflows

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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