J 2024

Accretion tori around rotating neutron stars: I. Structure, shape, and size

MATUSZKOVÁ, Monika, Gabriel TÖRÖK, Debora LANČOVÁ, Kateřina KLIMOVIČOVÁ, Jiří HORÁK et. al.

Basic information

Original name

Accretion tori around rotating neutron stars: I. Structure, shape, and size

Authors

MATUSZKOVÁ, Monika (203 Czech Republic, belonging to the institution), Gabriel TÖRÖK (203 Czech Republic, belonging to the institution), Debora LANČOVÁ (203 Czech Republic, belonging to the institution), Kateřina KLIMOVIČOVÁ (203 Czech Republic, belonging to the institution), Jiří HORÁK (203 Czech Republic), Martin URBANEC (203 Czech Republic, belonging to the institution), Eva ŠRÁMKOVÁ (203 Czech Republic, belonging to the institution), Odele STRAUB (756 Switzerland), Gabriela URBANCOVÁ (203 Czech Republic, belonging to the institution) and Vladimír KARAS (203 Czech Republic)

Edition

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2024, 0004-6361

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

France

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 6.500 in 2022

Organization unit

Institute of physics in Opava

UT WoS

001351092800013

Keywords in English

stars: neutron;accretion;accretion disks

Tags

International impact, Reviewed

Links

EF18_054/0014696, research and development project. EF19_073/0016951, research and development project. GX21-06825X, research and development project. LTC18058, research and development project. LTT17003, research and development project.
Změněno: 30/1/2025 14:05, Mgr. Pavlína Jalůvková

Abstract

V originále

We present a full general relativistic analytic solution for a radiation-pressure-supported equilibrium fluid torus orbiting a rotating neutron star (NS). We applied previously developed analytical methods that include the effects of both the NS's angular momentum and quadrupole moment in the Hartle-Thorne geometry. The structure, size, and shape of the torus are explored, with a particular focus on the critically thick solution - the cusp tori. For the astrophysically relevant range of NS parameters, we examined how our findings differ from those obtained for the Schwarzschild space-time. The solutions for rotating stars display signatures of an interplay between relativistic and Newtonian effects where the impact of the NS angular momentum and quadrupole moment are almost counterbalanced at a given radius. Nevertheless, the space-time parameters still strongly influence the size of tori, which can be shown in a coordinate-independent way. Finally, we discuss the importance of the size of the central NS which determines whether or not a surrounding torus exists. We provide a set of tools in a Wolfram Mathematica code, which establishes a basis for further investigation of the impact of the NSs' super-dense matter equation of state on the spectral and temporal behaviour of accretion tori.