Lense-Thirring precession of neutron-star accretion flows: Relativistic versus classical precession

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00641683" target="_blank" >RIV/67985815:_____/25:00641683 - isvavai.cz</a>

Alternative codes found

RIV/47813059:19630/25:A0000452

Result on the web

<a href="https://hdl.handle.net/11104/0371792" target="_blank" >https://hdl.handle.net/11104/0371792</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202554318" target="_blank" >10.1051/0004-6361/202554318</a>

Result language

angličtina

Original language name

Lense-Thirring precession of neutron-star accretion flows: Relativistic versus classical precession

Original language description

The vertical (Lense-Thirring) precession of the innermost accretion flows has been discussed as a sensitive indicator of the rotational properties of neutron stars (NSs) and their equation of state because it vanishes for a non-rotating star. For this work we applied the Hartle-Thorne spacetimes to study the frequencies of the precession for both geodesic and non-geodesic (fluid) flows. We built on previous findings of the effect of the NS quadrupole moment, which revealed the importance of the interplay between the relativistic and classical precession. Because of this interplay, the widely used Lense-Thirring metric, linear in the NS angular momentum, is insufficient to calculate the behaviour of the precession frequency across an astrophysically relevant range of NS angular momentum values. We find that even for moderately oblate NSs, the dependences of the precession frequency on the NS angular momentum at radii within the innermost accretion region have maxima that occur at relatively low values of the NS angular momentum. We conclude that very different groups of accreting NSs slow and fast rotators can display the same precession frequencies. This may explain the lack of evidence for a correlation between the frequencies of the observed low-frequency quasiperiodic oscillations and the NS spin. In our work we provide a full general description of precession behaviour, and also examples that assume specific NS and quark star (MIT bag) equations of state. Our calculations are reproducible using the associated Wolfram Mathematica notebook.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

703

Issue of the periodical within the volume

Oct.

Country of publishing house

FR - FRANCE

Number of pages

7

Pages from-to

A30

UT code for WoS article

001606951900003

EID of the result in the Scopus database

2-s2.0-105021250098