Search for the signatures of a new-born black hole from the collapse of a supra-massive millisecond magnetar in short GRB light curves

Zhang, Q.; Lei, Wei‐Hua; Zhang, B. B.; Chen, W.; Xiong, S. L.; Song, Liming

doi:10.1093/mnras/stx3229

Cited by 8 publications

(7 citation statements)

References 129 publications

(220 reference statements)

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“…First, the accretion flow will be halted by a magnetic barrier at some radius R halt . This occurs when the radial magnetic force can support against the gravitational force (Proga & Zhang 2006;Liu et al 2012;Zhang et al 2018),…”

Section: Magnetic Barrier Modelmentioning

confidence: 99%

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GRB 211211A: a Prolonged Central Engine under a Strong Magnetic Field Environment

Lei¹,

Zhu²

2022

ApJL

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Recently, a kilonova-associated gamma-ray burst (GRB 211211A), whose light curve consists of a precursor (∼0.2 s), a hard spiky emission (∼10 s), and a soft long extended emission (∼40 s), has attracted great attention. Kilonova association could prove its merger origin, while the detection of the precursor can be used to infer at least one highly magnetized neutron star (NS) being involved in the merger. In this case, a strong magnetic flux Φ is expected to surround the central engine of GRB 211211A. Here we suggest that when Φ is large enough, the accretion flow could be halted far from the innermost stable radius, which will significantly prolong the lifetime of the accretion process, and so the GRB duration. For example, we show that as long as the central black hole (BH) is surrounded by a strong magnetic flux Φ ∼ 1029cm2 G, an accretion flow with M ̇ ini ≃ 0.1 M ⊙ s − 1 could be halted at 40 times the gravitational radius and be slowly transferred into the black hole on the order of ∼10 s, which naturally explains the duration of hard spiky emission. After most of the disk mass has been accreted onto the BH, the inflow rate will be reduced, so a long and soft extended emission is expected when a new balance between the magnetic field and the accretion current is reconstructed at a larger radius. Our results further support that the special behavior of GRB 211211A is mainly due to the strong magnetic field of its progenitor stars.

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Section: Magnetic Barrier Modelmentioning

confidence: 99%

“…. It is reasonable to adopt ò i = 10 −3 -10 −2 (Proga & Zhang 2006;Liu et al 2012;Zhang et al 2018).…”

mentioning

confidence: 99%

GRB 211211A: a Prolonged Central Engine under a Strong Magnetic Field Environment

Lei¹,

Zhu²

2022

ApJL

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“…After the first part, since most of the disk mass has been accreted onto the BH, the inflow rate of the remaining mass should be quite low. A majority of the magnetic flux would quickly diffuse out (Liu et al 2012;Zhang et al 2018). The balance between the magnetic field and the accretion current will be reconstructed at a new and further radius.…”

Section: Magnetic Barrier Modelmentioning

confidence: 99%

“…Here the flow radial velocity, when the magnetic field is just in contact with the accretion flow, is assumed to be a fraction i of the free-fall velocity v ff = GM • /r. It is reasonable to adopt i = 10 −3 − 10 −2 (Proga & Zhang 2006;Liu et al 2012;Zhang et al 2018).…”

Section: Magnetic Barrier Modelmentioning

confidence: 99%

GRB 211211A: a Prolonged Central Engine under a Strong Magnetic Field Environment

Gao,

Lei,

Zhu

2022

Preprint

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Recently, a Kilonova-associated gamma-ray burst (GRB 211211A) has attracted great attentions, whose lightcurve consists a precursor (∼ 0.2 s), a hard spiky emission (∼ 10 s), and a soft long extended emission (∼ 40 s). Kilonova association could prove its merger origin, while the detection of the precursor infers at least one highly magnetized NS being involved in the merger. In this case, a strong magnetic flux Φ is expected to surround the central engine of GRB 211211A. Here we suggest that when Φ is large enough, the accretion flow could be halted far from the innermost stable radius, which will significantly prolong the lifetime of the accretion process, so as the GRB duration. For example, we show that as long as the central BH is surrounded by a strong magnetic flux Φ ∼ 10 29 cm 2 G, an accretion flow with Ṁini 0.1M s −1 could be halted at 40 times gravitational radius and slowly transfer into the black hole in order of ∼10 s, which naturally explains the duration of hard spiky emission. After most of the disk mass has been accreted onto the BH, the inflow rate will be reduced, so a long and soft extended emission is expected when a new balance between the magnetic field and the accretion current is reconstructed at a further radius. Our results further support that the special behavior of GRB 211211A is mainly due to the strong magnetic field of its progenitor stars. Multi-messenger detections of GRB 211211A-like events (sometimes may disguise as a typical LGRBs without extended emission) could help to diagnose their progenitor system and to better study the events of compact binary mergers involving high magnetic field NSs.

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“…Thus, we only consider the X-ray data at t > 10 3 s, excluding the extended emission that can be clearly seen at earlier times in Fig. 1 (see also Zhang et al 2018). The kilonova emission has been inferred to dominate the optical/nIR band from 1 day to 4 days after T 0 (Kasliwal et al 2017;Jin et al 2018;Troja et al 2019;Lamb et al 2019).…”

Section: Modeling Of Observations From Radio To X-raysmentioning

confidence: 99%

MAGIC Observations of the Nearby Short Gamma-Ray Burst GRB 160821B ^*

Acciari

Ansoldi

Antonelli

et al. 2021

ApJ

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The coincident detection of GW170817 in gravitational waves and electromagnetic radiation spanning the radio to MeV gamma-ray bands provided the first direct evidence that short gamma-ray bursts (GRBs) can originate from binary neutron star (BNS) mergers. On the other hand, the properties of short GRBs in high-energy gamma rays are still poorly constrained, with only ∼20 events detected in the GeV band, and none in the TeV band. GRB 160821B is one of the nearest short GRBs known at z = 0.162. Recent analyses of the multiwavelength observational data of its afterglow emission revealed an optical-infrared kilonova component, characteristic of heavy-element nucleosynthesis in a BNS merger. Aiming to better clarify the nature of short GRBs, this burst was automatically followed up with the MAGIC telescopes, starting from 24 seconds after the burst trigger. Evidence of a gammaray signal is found above ∼0.5 TeV at a significance of ∼ 3 σ during observations that lasted until 4 hours after the burst. Assuming that the observed excess events correspond to gamma-ray emission from GRB 160821B, in conjunction with data at other wavelengths, we investigate its origin in the framework of GRB afterglow models. The simplest interpretation with one-zone models of synchrotronself-Compton emission from the external forward shock has difficulty accounting for the putative TeV flux. Alternative scenarios are discussed where the TeV emission can be relatively enhanced. The role of future GeV-TeV observations of short GRBs in advancing our understanding of BNS mergers and related topics is briefly addressed.

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Search for the signatures of a new-born black hole from the collapse of a supra-massive millisecond magnetar in short GRB light curves

Cited by 8 publications

References 129 publications

GRB 211211A: a Prolonged Central Engine under a Strong Magnetic Field Environment

GRB 211211A: a Prolonged Central Engine under a Strong Magnetic Field Environment

GRB 211211A: a Prolonged Central Engine under a Strong Magnetic Field Environment

MAGIC Observations of the Nearby Short Gamma-Ray Burst GRB 160821B ^*

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Search for the signatures of a new-born black hole from the collapse of a supra-massive millisecond magnetar in short GRB light curves

Cited by 8 publications

References 129 publications

GRB 211211A: a Prolonged Central Engine under a Strong Magnetic Field Environment

GRB 211211A: a Prolonged Central Engine under a Strong Magnetic Field Environment

GRB 211211A: a Prolonged Central Engine under a Strong Magnetic Field Environment

MAGIC Observations of the Nearby Short Gamma-Ray Burst GRB 160821B *

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Product

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MAGIC Observations of the Nearby Short Gamma-Ray Burst GRB 160821B ^*