Cooling of compact stars with color superconducting phase in quark-hadron mixed phase

Tsuneo Noda, Masa-Aki Hashimoto, Nobutoshi Yasutake, Toshiki Maruyama, Toshitaka Tatsumi, Masayuki Fujimoto

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We present a new scenario for the cooling of compact stars considering the central source of Cassiopeia A (Cas A). The Cas A observation shows that the central source is a compact star that has high effective temperature, and it is consistent with the cooling without exotic phases. The observation also gives the mass range of M ≥ 1.5 M⊙, which may conflict with the current plausible cooling scenario of compact stars. There are some cooled compact stars such as Vela or 3C58, which can barely be explained by the minimal cooling scenario, which includes the neutrino emission by nucleon superfluidity (PBF). Therefore, we invoke the exotic cooling processes, where a heavier star cools faster than lighter one. However, the scenario seems to be inconsistent with the observation of Cas A. Therefore, we present a new cooling scenario to explain the observation of Cas A by constructing models that include a quark color superconducting (CSC) phase with a large energy gap; this phase appears at ultrahigh density regions and reduces neutrino emissivity. In our model, a compact star has a CSC quark core with a low neutrino emissivity surrounded by high emissivity region made by normal quarks. We present cooling curves obtained from the evolutionary calculations of compact stars: while heavier stars cool slowly, and lighter ones indicate the opposite tendency without considering nucleon superfluidity. Furthermore, we show that our scenario is consistent with the recent observations of the effective temperature of Cas A during the last 10 years, including nucleon superfluidity.

Original languageEnglish
Article number1
JournalAstrophysical Journal
Volume765
Issue number1
DOIs
Publication statusPublished - Mar 1 2013

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Cassiopeia A
quarks
cooling
color
stars
superfluidity
emissivity
cool stars
neutrinos
tendencies
temperature
curves
energy

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Noda, T., Hashimoto, M-A., Yasutake, N., Maruyama, T., Tatsumi, T., & Fujimoto, M. (2013). Cooling of compact stars with color superconducting phase in quark-hadron mixed phase. Astrophysical Journal, 765(1), [1]. https://doi.org/10.1088/0004-637X/765/1/1

Cooling of compact stars with color superconducting phase in quark-hadron mixed phase. / Noda, Tsuneo; Hashimoto, Masa-Aki; Yasutake, Nobutoshi; Maruyama, Toshiki; Tatsumi, Toshitaka; Fujimoto, Masayuki.

In: Astrophysical Journal, Vol. 765, No. 1, 1, 01.03.2013.

Research output: Contribution to journalArticle

Noda, T, Hashimoto, M-A, Yasutake, N, Maruyama, T, Tatsumi, T & Fujimoto, M 2013, 'Cooling of compact stars with color superconducting phase in quark-hadron mixed phase', Astrophysical Journal, vol. 765, no. 1, 1. https://doi.org/10.1088/0004-637X/765/1/1
Noda, Tsuneo ; Hashimoto, Masa-Aki ; Yasutake, Nobutoshi ; Maruyama, Toshiki ; Tatsumi, Toshitaka ; Fujimoto, Masayuki. / Cooling of compact stars with color superconducting phase in quark-hadron mixed phase. In: Astrophysical Journal. 2013 ; Vol. 765, No. 1.
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