Nuclear medium cooling scenario in the era of Cas A cooling data and 2 M⊙ pulsar mass measurements

2nd International Symposium on the Modern Physics of Compact Stars and Relativistic Gravity

物理学;天文学

Grigorian, H.A.^1,2 ; Blaschke, D.B.^3,4 ; Voskresensky, D.N.^5

Laboratory of Information Technologies, Joint Institute for Nuclear Research, 141980 Dubna, Russia^1

Yerevan State University, 0025 Yerevan, Armenia^2

Instytut Fizyki Teoretycznej, Uniwersytet Wroclawski, 50-204 Wroclaw, Poland^3

Laboratory for Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia^4

National Research Nuclear University (MEPhI), 115409 Moscow, Russia^5

关键词: Excluded volume effects;    Formation process;    Mass measurements;    Measurements of;    Neutron stars;    Nuclear medium;    Polarization effect;    Temperature data;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/496/1/012014/pdf
DOI  :  10.1088/1742-6596/496/1/012014

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We show that all reliably known temperature data of neutron stars including those belonging to Cassiopea A can be comfortably explained in our «nuclear medium cooling» scenario of neutron stars. The cooling rates account for medium-modified one-pion exchange in dense matter, polarization effects in the pair-breaking-formation processes operating on superfluid neutrons and protons paired in the 1S0state, and other relevant processes. The emissivity of the pair-breaking-formation process in the 3P2state is a tiny quantity within our scenario. Crucial for a successful description of the Cassiopeia A cooling proves to be the thermal conductivity from both, the electrons and nucleons, being reduced by medium effects. Moreover, we exploit an EoS which stiffens at high densities due to an excluded volume effect and is capable of describing a maximum mass of 2.1 Mo, thus including the recent measurements of PSR J1614-2230 and PSR J0348+0432.