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Title: Strange Quark Stars in Binaries: Formation Rates, Mergers, and Explosive Phenomena

Abstract

Recently, the possible coexistence of a first family composed of “normal” neutron stars (NSs) with a second family of strange quark stars (QSs) has been proposed as a solution of problems related to the maximum mass and to the minimal radius of these compact stellar objects. In this paper, we study the mass distribution of compact objects formed in binary systems and the relative fractions of quark and NSs in different subpopulations. We incorporate the strange QS formation model provided by the two-families scenario, and we perform a large-scale population synthesis study in order to obtain the population characteristics. According to our results, the main channel for strange QS formation in binary systems is accretion from a secondary companion on an NS. Therefore, a rather large number of strange QSs form by accretion in low-mass X-ray binaries and this opens the possibility of having explosive GRB-like phenomena not related to supernovae and not due to the merger of two NSs. The number of double strange QS systems is rather small, with only a tiny fraction that merge within a Hubble time. This drastically limits the flux of strangelets produced by the merger, which turns out to be compatible with allmore » limits stemming from Earth and lunar experiments. Moreover, this value of the flux rules out at least one relevant channel for the transformation of all NSs into strange QSs by strangelets’ absorption.« less

Authors:
 [1]; ;  [2];  [3]
  1. Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warsaw (Poland)
  2. Dipartimento di Fisica e Scienze della Terra dell’Università di Ferrara and INFN Sezione di Ferrara, Via Saragat 1, I-44100 Ferrara (Italy)
  3. Sternberg Astronomical Institute, Lomonosov Moscow State University, Universitetsky prospekt 13, 119234, Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
22679852
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 846; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; COMPUTERIZED SIMULATION; EXPLOSIVES; MASS; MASS DISTRIBUTION; NEUTRON STARS; S QUARKS; SUPERNOVAE; SYNTHESIS; TRANSFORMATIONS; X RADIATION

Citation Formats

Wiktorowicz, G., Drago, A., Pagliara, G., and Popov, S. B., E-mail: gwiktoro@astrouw.edu.pl. Strange Quark Stars in Binaries: Formation Rates, Mergers, and Explosive Phenomena. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA8629.
Wiktorowicz, G., Drago, A., Pagliara, G., & Popov, S. B., E-mail: gwiktoro@astrouw.edu.pl. Strange Quark Stars in Binaries: Formation Rates, Mergers, and Explosive Phenomena. United States. doi:10.3847/1538-4357/AA8629.
Wiktorowicz, G., Drago, A., Pagliara, G., and Popov, S. B., E-mail: gwiktoro@astrouw.edu.pl. Sun . "Strange Quark Stars in Binaries: Formation Rates, Mergers, and Explosive Phenomena". United States. doi:10.3847/1538-4357/AA8629.
@article{osti_22679852,
title = {Strange Quark Stars in Binaries: Formation Rates, Mergers, and Explosive Phenomena},
author = {Wiktorowicz, G. and Drago, A. and Pagliara, G. and Popov, S. B., E-mail: gwiktoro@astrouw.edu.pl},
abstractNote = {Recently, the possible coexistence of a first family composed of “normal” neutron stars (NSs) with a second family of strange quark stars (QSs) has been proposed as a solution of problems related to the maximum mass and to the minimal radius of these compact stellar objects. In this paper, we study the mass distribution of compact objects formed in binary systems and the relative fractions of quark and NSs in different subpopulations. We incorporate the strange QS formation model provided by the two-families scenario, and we perform a large-scale population synthesis study in order to obtain the population characteristics. According to our results, the main channel for strange QS formation in binary systems is accretion from a secondary companion on an NS. Therefore, a rather large number of strange QSs form by accretion in low-mass X-ray binaries and this opens the possibility of having explosive GRB-like phenomena not related to supernovae and not due to the merger of two NSs. The number of double strange QS systems is rather small, with only a tiny fraction that merge within a Hubble time. This drastically limits the flux of strangelets produced by the merger, which turns out to be compatible with all limits stemming from Earth and lunar experiments. Moreover, this value of the flux rules out at least one relevant channel for the transformation of all NSs into strange QSs by strangelets’ absorption.},
doi = {10.3847/1538-4357/AA8629},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 846,
place = {United States},
year = {2017},
month = {9}
}