Structured Jets and X-Ray Plateaus in Gamma-Ray Burst Phenomena

被引：51

作者：

Oganesyan, Gor ^{[1
,2
,3
]}

Ascenzi, Stefano ^{[1
,3
]}

Branchesi, Marica ^{[1
,2
,3
]}

Salafia, Om Sharan ^{[4
]}

Dall'Osso, Simone ^{[1
]}

Ghirlanda, Giancarlo ^{[4
,5
]}

机构：

[1] Gran Sasso Sci Inst, Viale F Crispi 7, I-67100 Laquila, AQ, Italy

[2] INFN, Lab Nazl Gran Sasso, I-67100 Laquila, AQ, Italy

[3] INAF, Osservatorio Astron Abruzzo, Via M Maggini Snc, I-64100 Teramo, Italy

[4] INAF, Osservatorio Astron Brera, Via Emilio Bianchi 46, I-23807 Merate, LC, Italy

[5] INFN Milano Bicocca, Piazza Sci 3, I-20123 Milan, Italy

来源：

ASTROPHYSICAL JOURNAL | 2020年 / 893卷 / 02期

关键词：

High energy astrophysics; Burst astrophysics; Gamma-ray bursts; AFTERGLOW LIGHT CURVES; ENERGY INJECTION; SPECTRAL EVOLUTION; RELATIVISTIC WIND; INTERNAL SHOCKS; PROMPT EMISSION; SHALLOW DECAY; MODEL; EFFICIENCY; PHASE;

D O I：

10.3847/1538-4357/ab8221

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The first multi-messenger detection of a binary neutron star merger, GW170817, brought to the forefront the structured jet model as a way to explain multiwavelength observations taken more than a year after the event. Here, we show that the high-latitude emission from a structured jet can naturally produce an X-ray plateau in gamma-ray burst (GRB) light curves, independent of the radiation from an external shock. We calculate the radiation from a switched-off shell featuring an angular structure in both its relativistic bulk motion and intrinsic brightness. Our model is able to explain the shallow decay phase (plateau) often observed in GRB X-ray light curves. We discuss the possible contribution of the structured jet high-latitude emission to other distinctive features of GRB X-ray light curves, and its capability to explain the chromatic optical/X-ray light-curve properties.

引用

页数：10

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