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 language | English |
|---|---|
| Article number | L1 |
| Number of pages | 6 |
| Journal | The Astrophysical Journal Letters |
| Volume | 843 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Jul 2017 |
Keywords
- gamma-ray burst: individual (GRB 130603B, GRB 140903A)
- stars: magnetars
- stars: neutron
Cite this
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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 journal › Article › Research › peer-review
TY - JOUR
T1 - The Braking Index of Millisecond Magnetars
AU - Lasky, Paul D.
AU - Leris, Cristiano
AU - Rowlinson, Antonia
AU - Glampedakis, Kostas
PY - 2017/7/1
Y1 - 2017/7/1
N2 - 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.
AB - 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.
KW - gamma-ray burst: individual (GRB 130603B, GRB 140903A)
KW - stars: magnetars
KW - stars: neutron
UR - http://www.scopus.com/inward/record.url?scp=85021711564&partnerID=8YFLogxK
U2 - 10.3847/2041-8213/aa79a7
DO - 10.3847/2041-8213/aa79a7
M3 - Article
AN - SCOPUS:85021711564
VL - 843
JO - The Astrophysical Journal Letters
JF - The Astrophysical Journal Letters
SN - 2041-8205
IS - 1
M1 - L1
ER -