Constraints from LIGO O3 Data on Gravitational-wave Emission Due to R-modes in the Glitching Pulsar PSR J0537-6910

R. Abbott*, T.D. Abbott*, S. Abraham, F. Acernese, K. Ackley, A. Adams, C. Adams, R.X. Adhikari, V.B. Adya, C. Affeldt, D. Agarwal, M. Agathos, K. Agatsuma, N. Aggarwal, O.D. Aguiar, L. Aiello, A. Ain, P. Ajith, T. Akutsu, K.M. AlemanG. Allen, A. Allocca, P.A. Altin, A. Amato, S. Anand, A. Ananyeva, S.B. Anderson, W.G. Anderson, M. Ando, S.V. Angelova, S. Ansoldi, J.M. Antelis, S. Antier, S. Appert, K. Arai, Y. Arai, S. Araki, A. Araya, M.C. Araya, J.S. Areeda, M. Arene, N. Aritomi, N. Arnaud, S.M. Aronson, K.G. Arun, H. Asada, Y. Asali, G. Ashton, Y. Aso, S. Hild, S.L. Danilishin, S.S. Steinlechner, J. Steinlechner, A.C. Utina, G. Koekoek, A. Singha, V. Spagnuolo, J.F.J. van den Brand

*Corresponding author for this work

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Abstract

We present a search for continuous gravitational-wave emission due to r-modes in the pulsar PSR J0537-6910 using data from the LIGO-Virgo Collaboration observing run O3. PSR J0537-6910 is a young energetic X-ray pulsar and is the most frequent glitcher known. The inter-glitch braking index of the pulsar suggests that gravitational-wave emission due to r-mode oscillations may play an important role in the spin evolution of this pulsar. Theoretical models confirm this possibility and predict emission at a level that can be probed by ground-based detectors. In order to explore this scenario, we search for r-mode emission in the epochs between glitches by using a contemporaneous timing ephemeris obtained from NICER data. We do not detect any signals in the theoretically expected band of 86-97 Hz, and report upper limits on the amplitude of the gravitational waves. Our results improve on previous amplitude upper limits from r-modes in J0537-6910 by a factor of up to 3 and place stringent constraints on theoretical models for r-mode-driven spin-down in PSR J0537-6910, especially for higher frequencies at which our results reach below the spin-down limit defined by energy conservation.
Original languageEnglish
Article number71
Number of pages22
JournalAstrophysical Journal
Volume922
Issue number1
DOIs
Publication statusPublished - 1 Nov 2021

Keywords

  • Gravitational waves
  • INSTABILITY
  • Neutron stars
  • Pulsars
  • BIG GLITCHER

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