2020A&A...641A..56R


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.05CET00:53:14

2020A&A...641A..56R - Astronomy and Astrophysics, volume 641A, 56-56 (2020/9-1)

Protomagnetar research through an analysis of the X-ray plateau in the multi-messengar era.

REN X., WEI D., ZHU Z., YAN Y. and LI C.

Abstract (from CDS):

The joint detection of the gravitational wave signal and the electromagnetic emission from a binary neutron star merger can place unprecedented constraint on the equation of state of supranuclear matter. Although a variety of electromagnetic counterparts have been observed for GW170817, including a short gamma-ray burst, kilonova, and the afterglow emission, the nature of the merger remnant is still unclear, however. The X-ray plateau is another important characteristics of short gamma-ray bursts. This plateau is probably due to the energy injection from a rapidly rotating magnetar. We investigate what we can learn from the detection of a gravitational wave along with the X-ray plateau. In principle, we can estimate the mass of the merger remnant if the X-ray plateau is caused by the central magnetar. We selected eight equations of state that all satisfy the constraint given by the gravitational wave observation, and then calculated the mass of the merger remnants of four short gamma-ray bursts with a well-measured X-ray plateau. If, on the other hand, the mass of the merger remnant can be obtained by gravitational wave information, then by comparing the masses derived by these two different methods can further constrain the equation of state. We discuss the possibility that the merger product is a quark star. In addition, we estimate the possible mass range for the recently discovered X-ray transient CDF-S XT2 that probably originated from a binary neutron star merger. Finally, under the assumption that the post-merger remnant of GW170817 was a supramassive neutron star, we estimated the allowed parameter space of the supramassive neutron star and find that in this case, the magnetic dipole radiation energy is so high that it may have some effects on the short gamma-ray burst and kilonova emission. The lack of detection of these effects suggests that the merger product of GW170817 may not be a supermassive neutron star.

Abstract Copyright: © ESO 2020

Journal keyword(s): gravitational waves - gamma-ray burst: individual: GRB170817 - stars: neutron - equation of state

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 GRB 070724A gB 01 51 14.08 -18 35 38.8           ~ 150 0
2 [BTS2017] CDF-S XT2 G 03 32 18.38 -27 52 24.2           ~ 12 0
3 GRB 101219A gB 04 58 20.45 -02 32 23.1           ~ 102 0
4 NGC 4993 GiG 13 09 47.706 -23 23 01.79   13.34   11.92   ~ 236 0
5 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 938 0
6 GRB 060801 gB 14 12 01.290 +16 58 54.00           ~ 138 0
7 GRB 100702A gB 16 22 47.26 -56 31 53.8           ~ 35 0
8 GRB 080905A gB 19 10 39.10 -18 51 55.4           ~ 139 0

    Equat.    Gal    SGal    Ecl

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2020.12.05-00:53:14

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