2022A&A...666A.138L


Query : 2022A&A...666A.138L

2022A&A...666A.138L - Astronomy and Astrophysics, volume 666A, 138 (2022/10-1)

Investigating magnetically induced distortions of neutron stars through gamma-ray burst X-ray plateaus.

LIN T., DU S., WANG W., HOU S. and XU R.

Abstract (from CDS):

The magnetic field may distort neutron stars (NSs), but its effect has not yet been robustly tested through gravitational-wave observations due to the absence of a fast-rotating Galactic magnetar. The investigation of parts of gamma-ray bursts (GRBs) can potentially shed light on the magnetically induced distortion since their central objects may be millisecond magnetars. In this paper we propose a method for estimating the distortions of these possible magnetars under the GRB magnetar scenario. According to the case study of GRB 070521, we find a relation between the effective magnetically induced ellipticity, ϵ_B, eff_, and the effective dipole magnetic field strength on NS surfaces, Beff, namely ϵ_B, eff_ ∼ 10–3(Beff/1015 G)2. Furthermore, we constrain the internal magnetic field structure of the magnetar to be Beff ∼ 0.02⟨Bt⟩ and Beff ∼ 0.1 Bt, where ⟨Bt⟩ is the volume-averaged internal toroidal field. This constraint can be used as the initial condition in modeling the structure of NS magnetospheres. Finally, the possibility of testing the method shown in this paper through gravitational-wave observations is discussed.

Abstract Copyright: © T. Lin et al. 2022

Journal keyword(s): gravitational waves - gamma-ray burst: individual: GRB 060807 - gamma-ray burst: individual: GRB 070420 - gamma-ray burst: individual: GRB 070521 - stars: magnetars

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 GRB 070110 gB 00 03 39.270 -52 58 27.00 21.8 21.9 21.2     ~ 202 0
2 GRB 070420 gB 08 04 55.170 -45 33 19.99 20.39 20.01 17.16     ~ 80 0
3 GRB 070521 gB 16 10 38.600 +30 15 22.70           ~ 149 0
4 GRB 060807 gB 16 50 02.600 +31 35 30.70           ~ 59 0

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