On the X-ray, optical and radio afterglows of the BdHN I GRB 180720B generated by the synchrotron emission
arXiv:2204.00579 · doi:10.3847/1538-4357/ac94c9
Abstract
Gamma-ray bursts (GRBs) are systems of unprecedented complexity across all the electromagnetic spectrum, including the radio, optical, X-rays, gamma-rays in the megaelectronvolt (MeV) and gigaelectronvolt (GeV) regime, as well as ultrahigh-energy cosmic rays (UHECRs), each manifested in seven specific physical processes with widely different characteristic evolution timescales ranging from s to s or longer. We here study the long GRB 180720B originating from a binary system composed of a massive carbon-oxygen (CO) star of about and a companion neutron star (NS). The gravitational collapse of the CO star gives rise to a spinning newborn NS (NS), with an initial period of ms that powers the synchrotron radiation in the radio, optical, and X-ray wavelengths. We here only investigate the GRB 180720B afterglows and present a detailed treatment of its origin based on the synchrotron radiation released by the interaction of the NS and the SN ejecta. We show that in parallel to the X-ray afterglow, the spinning NS also powers the optical and radio afterglows and allows us to infer the NS and ejecta parameters that fit the observational data.
arXiv commentAccepted for publication in The Astrophysical Journal
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