Evolution of fallback discs around millisecond magnetars: effect of supercritical accretion on GRB afterglows

Sercan Çlklntoǧlu*, Sinem Åaşmaz, M. Hakan Erkut, K. Yavuz Ekşi

*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: ???type-name???Makalebilirkişi

Özet

Some models of gamma-ray bursts (GRBs) invoke nascent millisecond magnetars as the central engine and address the X-ray afterglows with the interaction of magnetar magnetospheres with fallback discs. We study the evolution of fallback discs interacting with the millisecond magnetars. Initially, the accretion rate in the fallback disc is very high, well above the rate required for the Eddington limit. The inner parts of such a disc, even if it is cooling by the neutrino emission, get spherical due to the radiation pressure, which regulates the mass-accretion rate within the spherization radius. Such a disc can not penetrate the light cylinder radius for the typical magnetic fields, and the initial spin frequencies invoked for the magnetars. As a result of the autoregulation of the accretion flow, the fallback disc can not interact directly with the magnetar's magnetosphere within the first few days. This has implications for the fallback disc models of GRB afterglows since the accretion and propeller luminosities, in the presence of radiation pressure, are too low to address the typical luminosities of X-ray afterglows.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)5009-5014
Sayfa sayısı6
DergiMonthly Notices of the Royal Astronomical Society
Hacim525
Basın numarası4
DOI'lar
Yayın durumuYayınlandı - 1 Kas 2023

Bibliyografik not

Publisher Copyright:
© 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Finansman

SS and KYE acknowledge support from the Scientific and Technological Research Council of Turkey (TÜBİTAK) with project number 118F028.

FinansörlerFinansör numarası
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu118F028

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