ENERGY SOURCES AND LIGHT CURVES OF MACRONOVAE
ENERGY SOURCES AND LIGHT CURVES OF MACRONOVAE
复制标题
DOI：
10.1088/0004-637x/802/2/119
复制
发表时间：
2014-10
期刊：
影响因子：
--
通讯作者：
S. Kisaka;K. Ioka;H. Takami
中科院分区：
文献类型：
--
作者：
S. Kisaka;K. Ioka;H. Takami
一颗巨新星（kilonova）是在一次短伽马射线暴GRB 130603B中发现的，人们普遍认为它是由中子星(NS) -双星合并的喷射物中合成的r过程元素的放射性所驱动的。作为一种替代方案，我们提出宏观新星由中心引擎（即黑洞或黑洞）提供能量，注入的能量在喷射物绝热膨胀后发射出去。该引擎模型是由短伽马射线暴的扩展发射驱动的。为了将理论模型与观测结果进行比较，我们建立了巨新星光曲线的解析公式。发动机模型允许更宽的参数范围，特别是更小的喷射质量，并且比r过程模型更适合于观测。未来对引力波的电磁对应物的观测应该区分能量来源，并限制中心引擎和r过程核合成的活动。
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.