Goethe University Frankfort | 2018 Jan 15
Astrophysicists at Goethe University Frankfurt set a new limit for the maximum mass of neutron stars: It cannot exceed 2.16 solar masses
With a radius of about twelve kilometres and a mass that can be twice as large as that of the Sun, neutron stars are amongst the densest objects in the universe, producing gravitational fields comparable to those of black holes. Whilst most neutron stars have a mass of around 1.4 times that of the Sun, massive examples are also known, such as the pulsar PSR J0348+0432 with 2.01 solar masses.
The density of these stars is enormous, as if the entire Himalayas were compressed into a beer mug. However, there are indications that a neutron star with a maximum mass would collapse to a black hole if even just a single neutron were added. ...
Using Gravitational-Wave Observations and Quasi-Universal Relations to Constrain
the Maximum Mass of Neutron Stars - Luciano Rezzolla, Elias R. Most, Lukas R. Weih