Oscillations of fluid tori around neutron stars

@article{65883,
   author = {Šrámková, Eva and Matuszková, Monika and Klimovičová, Kateřina and Horak, Jiri and Straub, Odele and Urbancová, Gabriela and Urbanec, Martin and Karas, Vladimir and Török, Gabriel and Lančová, Debora},
   article_number = {1-2},
   doi = {http://dx.doi.org/10.1002/asna.20220114},
   keywords = {accretion; accretion disks; dense matter; equation of state; gravitation},
   language = {eng},
   issn = {0004-6337},
   journal = {Astronomische Nachrichten},
   title = {Oscillations of fluid tori around neutron stars},
   url = {https://onlinelibrary.wiley.com/doi/10.1002/asna.20220114},
   volume = {344},
   year = {2023}
}

TY  - JOUR
ID  - 65883
AU  - Šrámková, Eva - Matuszková, Monika - Klimovičová, Kateřina - Horak, Jiri - Straub, Odele - Urbancová, Gabriela - Urbanec, Martin - Karas, Vladimir - Török, Gabriel - Lančová, Debora
PY  - 2023
TI  - Oscillations of fluid tori around neutron stars
JF  - Astronomische Nachrichten
VL  - 344
IS  - 1-2
SP  - "e220114-1"-"e220114-4"
EP  - "e220114-1"-"e220114-4"
SN  - 00046337
KW  - accretion
KW  - accretion disks
KW  - dense matter
KW  - equation of state
KW  - gravitation
UR  - https://onlinelibrary.wiley.com/doi/10.1002/asna.20220114
N2  - We examine the influence of quadrupole moment of a slowly rotating neutron star (NS) on the oscillations of a fluid accretion disk (torus) orbiting a compact object the spacetime around which is described by the Hartle-Thorne geometry. Explicit formulae for non-geodesic orbital epicyclic and precession frequencies, as well as their simplified practical versions that allow for an expeditious application of the universal relations determining the NS properties, are obtained and examined. We demonstrate that the difference in the accretion disk precession frequencies for NSs of the same mass and angular momentum, but different oblateness, can reach up to tens of percent. Even higher differences can arise when NSs with the same mass and rotational frequency, but different equations of state (EoS), are considered. In particular, the Lense-Thirring precession frequency defined in the innermost parts of the accretion region can differ by more than one order of magnitude across NSs with different EoS. Our results have clear implications for models of the LMXBs variability.
ER  - 

ŠRÁMKOVÁ, Eva, Monika MATUSZKOVÁ, Kateřina KLIMOVIČOVÁ, Jiri HORAK, Odele STRAUB, Gabriela URBANCOVÁ, Martin URBANEC, Vladimir KARAS, Gabriel TÖRÖK and Debora LANČOVÁ. Oscillations of fluid tori around neutron stars. \textit{Astronomische Nachrichten}. 2023, vol.~344, 1-2, p.~''e220114-1''-''e220114-4'', 4 pp. ISSN~0004-6337. Available from: https://dx.doi.org/10.1002/asna.20220114.