Author Topic: Simultaneous Gravitational Waves and Gamma Ray Burst from merging neutron stars  (Read 4 times)


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We truly live in interesting times...

GW170817 is a gravitational wave signal observed by the LIGO/Virgo collaboration on 17 August 2017, and is the first such event simultaneously observed in telescopes with an electromagnetic counterpart.[1] The signal, which had a duration of about 100 seconds, is the first gravitational wave detection of the merger of two neutron stars, and was associated with a soft short gamma-ray burst GRB 170817A,[2][3] found in NGC 4993.[4] No neutrino candidates consistent with the source were found in follow-up searches

This pretty much confirms that short gamma ray bursts are from merging binary neutron stars. This also shows where much of the elements heavier than Iron come from:

The gravitational wave signal indicated that the gravitational wave event was associated with the collision of two neutron stars[6][7][12][9] with masses between 0.86 and 2.26 times the mass of the Sun (solar mass). If a low spin is assumed, consistent with those observed in binary neutron stars that will merge within a Hubble time, this mass range reduces to 1.17 to 1.60 solar masses.[1] The total mass of the binary system was between 2.73 and 3.29 solar masses.[1]
The neutron star merger event is thought to be a kilonova. Kilonovae are candidates for the production of half the chemical elements heavier than iron in the Universe.[4] A total of 16,000 times the mass of the Earth in heavy elements is expected to have formed, including about 10 Earth masses of gold and platinum.[13]
It is not known what object was produced by the merger. Candidates are a neutron star heavier than any known neutron star today, or a black hole lighter than any known black hole.[11]

That is a LOT of precious metals...