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A wind environment and Lorentz factors of tens explain gamma-ray bursts X-ray plateau

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A wind environment and Lorentz factors of tens explain gamma-ray bursts X-ray plateau. / Dereli-Bégué, Hüsne; Pe’er, Asaf; Ryde, Felix et al.
In: Nature Communications, Vol. 13, 5611, 24.09.2022.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Dereli-Bégué, H, Pe’er, A, Ryde, F, Oates, SR, Zhang, B & Dainotti, MG 2022, 'A wind environment and Lorentz factors of tens explain gamma-ray bursts X-ray plateau', Nature Communications, vol. 13, 5611. https://doi.org/10.1038/s41467-022-32881-1

APA

Dereli-Bégué, H., Pe’er, A., Ryde, F., Oates, S. R., Zhang, B., & Dainotti, M. G. (2022). A wind environment and Lorentz factors of tens explain gamma-ray bursts X-ray plateau. Nature Communications, 13, Article 5611. https://doi.org/10.1038/s41467-022-32881-1

Vancouver

Dereli-Bégué H, Pe’er A, Ryde F, Oates SR, Zhang B, Dainotti MG. A wind environment and Lorentz factors of tens explain gamma-ray bursts X-ray plateau. Nature Communications. 2022 Sept 24;13:5611. doi: 10.1038/s41467-022-32881-1

Author

Dereli-Bégué, Hüsne ; Pe’er, Asaf ; Ryde, Felix et al. / A wind environment and Lorentz factors of tens explain gamma-ray bursts X-ray plateau. In: Nature Communications. 2022 ; Vol. 13.

Bibtex

@article{c8853bbc8853478c8a788e3a52f13f98,
title = "A wind environment and Lorentz factors of tens explain gamma-ray bursts X-ray plateau",
abstract = "Gamma-ray bursts (GRBs) are known to have the most relativistic jets, with initial Lorentz factors in the order of a few hundreds. Many GRBs display an early X-ray light-curve plateau, which was not theoretically expected and therefore puzzled the community for many years. Here, we show that this observed signal is naturally obtained within the classical GRB fireball model, provided that the initial Lorentz factor is rather a few tens, and the expansion occurs into a medium-low density wind. The range of Lorentz factors in GRB jets is thus much wider than previously thought and bridges an observational gap between mildly relativistic jets inferred in active galactic nuclei, to highly relativistic jets deduced in few extreme GRBs. Furthermore, long GRB progenitors are either not Wolf-Rayet stars, or the wind properties during the final stellar evolution phase are different than at earlier times. Our model has predictions that can be tested to verify or reject it in the future, such as lack of GeV emission, lack of strong thermal component and long (few seconds) variability during the prompt phase characterizing plateau bursts.",
author = "H{\"u}sne Dereli-B{\'e}gu{\'e} and Asaf Pe{\textquoteright}er and Felix Ryde and Oates, {Samantha R.} and Bing Zhang and Dainotti, {Maria G.}",
year = "2022",
month = sep,
day = "24",
doi = "10.1038/s41467-022-32881-1",
language = "English",
volume = "13",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",

}

RIS

TY - JOUR

T1 - A wind environment and Lorentz factors of tens explain gamma-ray bursts X-ray plateau

AU - Dereli-Bégué, Hüsne

AU - Pe’er, Asaf

AU - Ryde, Felix

AU - Oates, Samantha R.

AU - Zhang, Bing

AU - Dainotti, Maria G.

PY - 2022/9/24

Y1 - 2022/9/24

N2 - Gamma-ray bursts (GRBs) are known to have the most relativistic jets, with initial Lorentz factors in the order of a few hundreds. Many GRBs display an early X-ray light-curve plateau, which was not theoretically expected and therefore puzzled the community for many years. Here, we show that this observed signal is naturally obtained within the classical GRB fireball model, provided that the initial Lorentz factor is rather a few tens, and the expansion occurs into a medium-low density wind. The range of Lorentz factors in GRB jets is thus much wider than previously thought and bridges an observational gap between mildly relativistic jets inferred in active galactic nuclei, to highly relativistic jets deduced in few extreme GRBs. Furthermore, long GRB progenitors are either not Wolf-Rayet stars, or the wind properties during the final stellar evolution phase are different than at earlier times. Our model has predictions that can be tested to verify or reject it in the future, such as lack of GeV emission, lack of strong thermal component and long (few seconds) variability during the prompt phase characterizing plateau bursts.

AB - Gamma-ray bursts (GRBs) are known to have the most relativistic jets, with initial Lorentz factors in the order of a few hundreds. Many GRBs display an early X-ray light-curve plateau, which was not theoretically expected and therefore puzzled the community for many years. Here, we show that this observed signal is naturally obtained within the classical GRB fireball model, provided that the initial Lorentz factor is rather a few tens, and the expansion occurs into a medium-low density wind. The range of Lorentz factors in GRB jets is thus much wider than previously thought and bridges an observational gap between mildly relativistic jets inferred in active galactic nuclei, to highly relativistic jets deduced in few extreme GRBs. Furthermore, long GRB progenitors are either not Wolf-Rayet stars, or the wind properties during the final stellar evolution phase are different than at earlier times. Our model has predictions that can be tested to verify or reject it in the future, such as lack of GeV emission, lack of strong thermal component and long (few seconds) variability during the prompt phase characterizing plateau bursts.

U2 - 10.1038/s41467-022-32881-1

DO - 10.1038/s41467-022-32881-1

M3 - Journal article

VL - 13

JO - Nature Communications

JF - Nature Communications

SN - 2041-1723

M1 - 5611

ER -