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Aim: To study the multimessenger nature of the signal that can result fromthe phase transition of a neutron star to a quark star and their correspondingastrophysical observations. Methods: The phase transition process is initiatedby the abrupt pressure and density changes at the star center, giving rise to ashock which deconfines matter followed by a weak front converting excess downto strange quarks to attain absolute stability. This process's effects areinvestigated by understanding how the energy escapes from the star in the formof neutrino-antineutrino annihilation. For such annihilation process, thecorresponding energy deposition rate is calculated. Structural changes due tothe energy loss have been investigated in the likes of misalignment angleevolution of the star and its astrophysical observation through gravitationalwaves. Results: The energy and time signature for the neutrino-antineutrinoannihilation is compared with the observed isotropic energy for a shortgamma-ray burst. The misalignment angle evolves to align the star's tilt axis,which can lead to the sudden increase or decrease of radio intensity from thepulsar. The corresponding gravitational wave emission, both continuous andburst, all lead towards multimessenger signals coming from the phasetransition.

Multimessenger signal from phase transition of neutron star to quark star