Giant X-Ray and Optical Bump in GRBs: Evidence for Fallback Accretion Model
Giant X-Ray and Optical Bump in GRBs: Evidence for Fallback Accretion Model
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伽玛射线暴中的巨大 X 射线和光学凸块:回退吸积模型的证据
DOI:
10.3847/1538-4357/abc8ec
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发表时间:
2020-12
影响因子:
4.9
通讯作者:
Liu Liangduan
中科院分区:
文献类型:
--
作者:
Zhao Litao;Gao He;Lei WeiHua;Lan Lin;Liu Liangduan
The successful operation of dedicated detectors has brought us valuable information for understanding the central engine and the progenitor of gamma-ray bursts (GRBs). For instance, the giant X-ray and optical bumps found in some long-duration GRBs (e.g., GRBs 121027A and 111209A) imply that some extended central engine activities, such as the late X-ray flares, are likely due to the fall-back of progenitor envelope materials. Here we systemically search for long GRBs that consist of a giant X-ray or optical bump from the Swift GRB sample, and eventually we find 19 new possible candidates. The fall-back accretion model could interpret the X-ray and optical bump for all candidates within a reasonable parameter space. Six candidates showing simultaneous bump signatures in both X-ray and optical observations, which could be well fitted at the same time when scaling down the X-ray flux into optical by one order of magnitude, are consistent with the standard Fν ∝ ν1/3 synchrotron spectrum. The typical fall-back radius is distributed around 1010–1012 cm, which is consistent with the typical radius of a Wolf–Rayet star. The peak fall-back accretion rate is in the range of ∼10−11–10−4M⊙ s−1 at time ∼102–105 s, which is relatively easy to fulfill as long as the progenitor’s metallicity is not too high. Combined with the sample we found, future studies of the mass supply rate for the progenitors with different mass, metallicity, and angular momentum distribution would help us to better constrain the progenitor properties of long GRBs.
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DOI:
10.1086/312689
发表时间:
2000-03
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
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通讯作者:
R. Sari;P. Mészáros
DOI:
10.1086/320255
发表时间:
2000-11
期刊:
The Astrophysical Journal Letters
影响因子:
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作者:
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通讯作者:
Bing Zhang;P. Mészáros
DOI:
10.1088/0004-637x/758/1/46
发表时间:
2012-05
期刊:
The Astrophysical Journal
影响因子:
--
作者:
T. Krühler;D. Malesani;B. Milvang-Jensen;J. Fynbo;J. Hjorth;P. Jakobsson;A. Levan;M. Sparre;N. Tanvir;D. Watson
通讯作者:
T. Krühler;D. Malesani;B. Milvang-Jensen;J. Fynbo;J. Hjorth;P. Jakobsson;A. Levan;M. Sparre;N. Tanvir;D. Watson
影响因子:
7.9
作者:
Zhang, Bing;Lei, Wei-Hua
通讯作者:
Lei, Wei-Hua
DOI:
10.3847/1538-4365/ab4711
发表时间:
2019-05
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
作者:
Tang Chen-Han;Huang Yong-Feng;Geng Jin-Jun;Zhang Zhi-Bin
通讯作者:
Zhang Zhi-Bin