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Title: ENERGY SOURCES AND LIGHT CURVES OF MACRONOVAE

Abstract

A macronova (kilonova) was discovered with a short gamma-ray burst, GRB 130603B, which is widely believed to be powered by the radioactivity of r-process elements synthesized in the ejecta of a neutron star (NS)–binary merger. As an alternative, we propose that macronovae are energized by the central engine, i.e., a black hole or NS, and the injected energy is emitted after the adiabatic expansion of ejecta. This engine model is motivated by extended emission of short GRBs. In order to compare the theoretical models with observations, we develop analytical formulae for the light curves of macronovae. The engine model allows a wider parameter range, especially smaller ejecta mass, and a better fit to observations than the r-process model. Future observations of electromagnetic counterparts of gravitational waves should distinguish energy sources and constrain the activity of the central engine and the r-process nucleosynthesis.

Authors:
; ;  [1]
  1. Theory Center, Institute of Particle and Nuclear Studies, KEK, Tsukuba 305-0801 (Japan)
Publication Date:
OSTI Identifier:
22522012
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 802; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BLACK HOLES; COMPARATIVE EVALUATIONS; COSMIC GAMMA BURSTS; DIAGRAMS; GRAVITATIONAL WAVES; MASS; NEUTRON STARS; NOVAE; NUCLEOSYNTHESIS; R PROCESS; RADIOACTIVITY; VISIBLE RADIATION

Citation Formats

Kisaka, Shota, Ioka, Kunihito, and Takami, Hajime, E-mail: kisaka@post.kek.jp, E-mail: takami@post.kek.jp, E-mail: kunihito.ioka@kek.jp. ENERGY SOURCES AND LIGHT CURVES OF MACRONOVAE. United States: N. p., 2015. Web. doi:10.1088/0004-637X/802/2/119.
Kisaka, Shota, Ioka, Kunihito, & Takami, Hajime, E-mail: kisaka@post.kek.jp, E-mail: takami@post.kek.jp, E-mail: kunihito.ioka@kek.jp. ENERGY SOURCES AND LIGHT CURVES OF MACRONOVAE. United States. doi:10.1088/0004-637X/802/2/119.
Kisaka, Shota, Ioka, Kunihito, and Takami, Hajime, E-mail: kisaka@post.kek.jp, E-mail: takami@post.kek.jp, E-mail: kunihito.ioka@kek.jp. Wed . "ENERGY SOURCES AND LIGHT CURVES OF MACRONOVAE". United States. doi:10.1088/0004-637X/802/2/119.
@article{osti_22522012,
title = {ENERGY SOURCES AND LIGHT CURVES OF MACRONOVAE},
author = {Kisaka, Shota and Ioka, Kunihito and Takami, Hajime, E-mail: kisaka@post.kek.jp, E-mail: takami@post.kek.jp, E-mail: kunihito.ioka@kek.jp},
abstractNote = {A macronova (kilonova) was discovered with a short gamma-ray burst, GRB 130603B, which is widely believed to be powered by the radioactivity of r-process elements synthesized in the ejecta of a neutron star (NS)–binary merger. As an alternative, we propose that macronovae are energized by the central engine, i.e., a black hole or NS, and the injected energy is emitted after the adiabatic expansion of ejecta. This engine model is motivated by extended emission of short GRBs. In order to compare the theoretical models with observations, we develop analytical formulae for the light curves of macronovae. The engine model allows a wider parameter range, especially smaller ejecta mass, and a better fit to observations than the r-process model. Future observations of electromagnetic counterparts of gravitational waves should distinguish energy sources and constrain the activity of the central engine and the r-process nucleosynthesis.},
doi = {10.1088/0004-637X/802/2/119},
journal = {Astrophysical Journal},
number = 2,
volume = 802,
place = {United States},
year = {Wed Apr 01 00:00:00 EDT 2015},
month = {Wed Apr 01 00:00:00 EDT 2015}
}