The effect of hydrodynamical instabilities and of convection in the conversion of an hadronic star to a more compact object

• Published in: Physics of particles and nuclei Vol. 39; no. 7; pp. 1170 - 1172
• Main Authors: Parenti, I., Drago, A., Lavagno, A.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01-12-2008
• Subjects: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CONVECTION; EQUATIONS OF STATE; HYPERONS; INSTABILITY; Part 3. Applications in Astrophysics; Particle and Nuclear Physics; Physics; Physics and Astronomy; QUARK MATTER; STARS; 97.20.-w
• ISSN: 1063-7796; 1531-8559
• DOI: 10.1134/S1063779608070344

We study the hydrodynamical transition from an hadronic star into a quark or a hybrid star. We discuss the possible mode of burning, using a fully relativistic formalism and realistic Equations of State in which hyperons can be present. We take into account the possibility that quarks form a diquark condensate. We find that the conversion process always corresponds to a deflagration and never to a detonation. Hydrodynamical instabilities can develop on the front but the increase in the conversion’s velocity is not sufficient to transform the deflagration into a detonation. Concerning convection, it does not always develop. Instead, the process of conversion from ungapped quark matter to gapped quarks always allows the formation of a convective layer.