(Seminar) Observational evidence for Extended Emission to GW170817--Institute of Theoretical Physics，Chinese Academy of Sciences

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09/25 2018

Abstract

CAS Key Laboratory of Theoretical Physics
Institute of Theoretical Physics
Chinese Academy of Sciences
Seminar
Title 题目	Observational evidence for Extended Emission to GW170817
Speaker 报告人	Maurice Van Putten
Affiliation 所在单位	Sejong University
Date 日期	10:00am, Sep 25, 2018, Tuesday
Venue 地点	Conference Room 6420, ITP new building
Abstract 摘要	The recent LIGO event GW170817 is the merger of a double neutron star system with an associated short GRB170817A with 2.9 ± 0.3 s soft emission over 8-70 keV. This association has a Gaussian equivalent level of confidence of 5.1σ. The merger produced a hyper-massive neutron star of stellar mass black hole with prompt or continuous energy output powering GRB170817A. Here, we report on a possible detection of Extended Emission (EE) in gravitational radiation during GRB170817A: a descending chirp with characteristic time scale τs = 3.01 ± 0.2？s in a (H1,L1)-spectrogram up to 700 Hz with Gaussian equivalent level of confidence greater than 3.3σ based on causality alone following edge detection applied to (H1,L1)-spectrograms merged by frequency coincidences. Additional confidence derives from the strength of this EE. The observed frequencies below 1kHz indicate a hyper-massive magnetar rather than a black hole, spinning down by magnetic winds and interactions with dynamical mass ejecta.
Contact person 所内联系人	Hossein Yavartanoo