Roy, Soumen and Sengupta, Anand S. et al.Soumen and Sengupta, Anand S. et al.Roy2025-08-312025-08-312021-11-2010.3847/1538-4357/ac0d522-s2.0-85121208407https://repository.iitgn.ac.in/handle/IITG2025/25212We 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.trueGravitational waves | Neutron stars | PulsarsArticlehttps://iopscience.iop.org/article/10.3847/1538-4357/ac0d52/pdf1538435720 November 2021447141WOS:000722733200001