scholarly journals Observable signatures of enhanced axion emission from protoneutron stars

2021 ◽  
Vol 104 (10) ◽  
Author(s):  
Tobias Fischer ◽  
Pierluca Carenza ◽  
Bryce Fore ◽  
Maurizio Giannotti ◽  
Alessandro Mirizzi ◽  
...  
Keyword(s):  
Protoneutron Stars

A NUCLEAR MANY-BODY THEORY AT FINITE TEMPERATURE APPLIED TO A PROTONEUTRON STAR

2002 ◽  
Vol 11 (02) ◽  
pp. 83-104 ◽  
Author(s):  
GUILHERME F. MARRANGHELLO ◽  
CESAR A. Z. VASCONCELLOS ◽  
MANFRED DILLIG ◽  
J. A. DE FREITAS PACHECO
Keyword(s):  
Phase Transition ◽  
Nuclear Matter ◽  
Finite Temperature ◽  
Degrees Of Freedom ◽  
Many Body ◽  
Many Body Theory ◽  
The Masses ◽  
Protoneutron Stars ◽  
Protoneutron Star

Thermodynamical properties of nuclear matter are studied in the framework of an effective many-body field theory at finite temperature, considering the Sommerfeld approximation. We perform the calculations by using the nonlinear Boguta and Bodmer model, extended by the inclusion of the fundamental baryon octet and leptonic degrees of freedom. Trapped neutrinos are also included in order to describe protoneutron star properties through the integration of the Tolman–Oppenheimer–Volkoff equations, from which we obtain, beyond the standard relations for the masses and radii of protoneutron stars as functions of the central density, new results of these quantities as functions of temperature. Our predictions include: the determination of an absolute value for the limiting mass of protoneutron stars; new structural aspects on the nuclear matter phase transition via the behavior of the specific heat and, through the inclusion of quark degrees of freedom, the properties of a hadron-quark phase transition and hybrid protoneutron stars

Thermal protoneutron stars with hyperons

2009 ◽  
Vol 33 (S1) ◽  
pp. 70-72 ◽  
Author(s):  
Yu Zi ◽  
Liu Guang-Zhou ◽  
Zhu Ming-Feng ◽  
Ding Wen-Bo ◽  
Zhao En-Guang
Keyword(s):  
Protoneutron Stars

scholarly journals Rapid spin deceleration of magnetized protoneutron stars via asymmetric neutrino emission

2014 ◽  
Vol 89 (3) ◽  
Author(s):  
Tomoyuki Maruyama ◽  
Jun Hidaka ◽  
Toshitaka Kajino ◽  
Nobutoshi Yasutake ◽  
Takami Kuroda ◽  
...  
Keyword(s):  
Neutrino Emission ◽  
Protoneutron Stars

scholarly journals Magnetar formation through a convective dynamo in protoneutron stars

2020 ◽  
Vol 6 (11) ◽  
pp. eaay2732 ◽  
Author(s):  
Raphaël Raynaud ◽  
Jérôme Guilet ◽  
Hans-Thomas Janka ◽  
Thomas Gastine
Keyword(s):  
Gamma Ray ◽  
Magnetic Energy ◽  
Three Dimensional ◽  
Observational Constraints ◽  
Rotation Rates ◽  
Theoretical Support ◽  
Firm Basis ◽  
Protoneutron Stars ◽  
Protoneutron Star ◽  
Three Dimensional Simulations

The release of spin-down energy by a magnetar is a promising scenario to power several classes of extreme explosive transients. However, it lacks a firm basis because magnetar formation still represents a theoretical challenge. Using the first three-dimensional simulations of a convective dynamo based on a protoneutron star interior model, we demonstrate that the required dipolar magnetic field can be consistently generated for sufficiently fast rotation rates. The dynamo instability saturates in the magnetostrophic regime with the magnetic energy exceeding the kinetic energy by a factor of up to 10. Our results are compatible with the observational constraints on galactic magnetar field strength and provide strong theoretical support for millisecond protomagnetar models of gamma-ray burst and superluminous supernova central engines.

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