Studying the onset of deconfinement with multi?messenger astronomy of neutron stars

With the first multi-messenger observation of a binary neutron star merger (GW170817) new constraints became available for masses and radii stars. We introduce class hybrid EoS that fulfils all these predicts region in mass-radius diagram could be populated only by stars with quark matter cores. A confirmation this conjecture would provided when NICER radius measurement high-mass pulsar PSR J0740+6620 yields less than 11 km. Would yield result excess 12 km, allow both, purely hadronic nature star. In latter case maximum mass reach $2.6~M_\odot$ so lighter object asymmetric GW190814 have been demonstrate high can compatible an early onset deconfinement at below $1~M_\odot$ occurrence low-mass twin such remnant GW170817 long-lived hypermassive pulsar.