Detection of the second ever Neutron Star Merger

Published in the Research School of Physics Event Horizon
Vol45 Issue2 13–17 January 2020

Detection of the second ever Neutron Star Merger announced

Centre for Gravitational Astrophysics (CGA) incorporating the ANU node of OzGrav contributed to the detection of a collision of two neutron stars earlier in 2019—only the second time this type of cosmic event had ever been detected. The gravitational-wave observatory network, that includes the National Science Foundation's LIGO and the European Virgo detectors, picked up what appeared to be gravitational ripples from a collision of two neutron stars back on 25 April 2019.  

This second event in 2019, called GW190425, did not result in any light being detected; however, researchers have learned that the collision resulted in a merged object with an unusually high mass, 3.4 times heavier than the Sun. This detection was only possible by continued improvement of the sensitivity of the gravitational wave detectors including reducing the quantum noise in the detectors, in which CGA researchers played a vital role.

https://www.anu.edu.au/news/all-news/the-curious-case-of-a-star-crash-in-a-galaxy-far-far-away

https://www.ozgrav.org/news