[3] From 2017 until 2021 he was working at the Max Planck Institute for Radio Astronomy in Bonn, Germany.
[6] In 2013 he led the team that measured the mass of the neutron star in the binary system PSR J0348+0432.
[7][8][9] This measurement confirmed the existence of supermassive neutron stars and made possible a new test of Einstein's theory of general relativity.
In 2016, Antoniadis together with André van Staden, a South African amateur astronomer, announced the discovery of magnetic activity on the surface of the companion star of a millisecond pulsar.
[13] His thesis was included in the “outstanding theses” series by Springer Nature[14] In 2016 he received the John Charles Polanyi Prize for Physics by the Council of Ontario Universities.