The Braking Index of Millisecond Magnetars

Paul D. Lasky, Cristiano Leris, Antonia Rowlinson, Kostas Glampedakis

Research output: Contribution to journalArticleResearchpeer-review

24 Citations (Scopus)

Abstract

We make the first measurement of the braking index n of two putative millisecond magnetars born in short gamma-ray bursts. We measure n = 2.9 ± 0.1 and n 2.6 ± 0.1 for millisecond magnetars born in GRB 130603B and GRB 140903A, respectively. The neutron star born in GRB 130603B has the only known a braking index consistent with the fiducial n = 3 value. This value is ruled out with 99.95% confidence for GRB 140903A. We discuss possible causes of n < 3braking indices in millisecond magnetars, showing that several models can account for the measurement of the braking index in GRB 140903A, while it is more difficult to account for a braking index consistent with n = 3.

Original languageEnglish
Article numberL1
Number of pages6
JournalThe Astrophysical Journal Letters
Volume843
Issue number1
DOIs
Publication statusPublished - 1 Jul 2017

Keywords

  • gamma-ray burst: individual (GRB 130603B, GRB 140903A)
  • stars: magnetars
  • stars: neutron

Cite this

Lasky, Paul D. ; Leris, Cristiano ; Rowlinson, Antonia ; Glampedakis, Kostas. / The Braking Index of Millisecond Magnetars. In: The Astrophysical Journal Letters. 2017 ; Vol. 843, No. 1.
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The Braking Index of Millisecond Magnetars. / Lasky, Paul D.; Leris, Cristiano; Rowlinson, Antonia; Glampedakis, Kostas.

In: The Astrophysical Journal Letters, Vol. 843, No. 1, L1, 01.07.2017.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Glampedakis, Kostas

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