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Magnetic fields in galactic binaries and gravitational waves

Published online by Cambridge University Press:  27 February 2023

A. Bourgoin Open the ORCID record for A. Bourgoin [Opens in a new window] ,
C. Le Poncin-Lafitte ,
S. Mathis  and
M.-C. Angonin
A. Bourgoin*
Affiliation:
SYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, LNE, 61 avenue de l’Observatoire, 75014 Paris, France Département d’Astrophysique-AIM, CEA/IRFU/DAp, CNRS/INSU, Université Paris-Saclay, Université de Paris, Gif-sur-Yvette, France
C. Le Poncin-Lafitte
Affiliation:
SYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, LNE, 61 avenue de l’Observatoire, 75014 Paris, France
S. Mathis
Affiliation:
Département d’Astrophysique-AIM, CEA/IRFU/DAp, CNRS/INSU, Université Paris-Saclay, Université de Paris, Gif-sur-Yvette, France
M.-C. Angonin
Affiliation:
SYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, LNE, 61 avenue de l’Observatoire, 75014 Paris, France
*
email: adrien.bourgoin@obspm.fr
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Abstract

The Laser Interferometer Space Antenna (LISA) mission will observe from space gravitational waves emitted by neutron stars and white dwarfs within galactic binaries. These compact stars can have intense magnetic fields. Therefore, the impact of the magnetic fields on the orbital and the spins evolution of binary systems can potentially be detected by LISA through the GW’s strain. Within the magnetic dipole-dipole approximation, we found that magnetism generates a secular drift of the mean longitude which, in turn, shifts all the frequencies contained in the GW signal. For a quasi-circular orbit, the signal is mainly monochromatic and the magnetic shift is proportional to the product of the magnetic moments and is inversely proportional to the 7/2 power of the semi-major axis. Hence, for a highly magnetic binary system in compact orbit, a non-negligible amount of the frequency measured by LISA might have a magnetic origin.

Keywords

gravitationgravitational wavesmagnetic fieldsneutron starswhite dwarfs
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S363: Neutron Star Astrophysics at the Crossroads: Magnetars and the Multimessenger Revolution , June 2020 , pp. 361 - 362
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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References

Blanchet, L., 2014, Living Reviews in Relativity, 17CrossRefGoogle Scholar
Bourgoin, A., Le Poncin Lafitte, C., Mathis, S., & Angonin, M.-C., 2022, arXiv, 2201.03226Google Scholar
Braithwaite, J. & Spruit, H. C., 2004, Nature, 431, 7010 CrossRefGoogle Scholar
Ferrario, L., Wickramasinghe, D., & Kawka, A., 2020, Advances in Space Research, 66, 5 CrossRefGoogle Scholar