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Ultrafast Compact Binary Mergers
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DOI：10.3847/1538-4357/ad32cd.png)
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The duration of orbital decay induced by gravitational waves (GWs) is often the bottleneck of the evolutionary phases going from star formation to a merger. We show here that kicks imparted to the newly born compact object during the second collapse generically result in a GW merger time distribution behaving like dN / d log t proportional to t 2 / 7 at short durations, leading to ultrafast mergers. Namely, a nonnegligible fraction of neutron star binaries, formed in this way, will merge on a timescale as short as 10 Myr, and a small fraction will merge even on a timescale less than 10 kyr. The results can be applied to different types of compact binaries. We discuss here the implications for binary neutron star mergers. These include unique short gamma-ray bursts (GRBs), eccentric and misaligned mergers, r-process enrichment in the very early Universe and in highly star-forming regions, and possible radio precursors. Interestingly, we conclude that among the few hundred short GRBs detected so far, a few must have formed via this ultrafast channel.
Keyword:
NEUTRON-STAR MERGERS
GRAVITATIONAL-WAVE SOURCES
R-PROCESS ELEMENTS
DELAY-TIME DISTRIBUTION
GAMMA-RAY BURSTS
NATAL KICKS
ELECTROMAGNETIC COUNTERPART
POPULATION SYNTHESIS
CHEMICAL EVOLUTION
PROCESS ENRICHMENT
期刊
IF:
5.4
论文数:
8.3W
被引数:
32.0W
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