Precision pulsar timing with the ORT and the GMRT and its applications in pulsar astrophysics
BHAL CHANDRA JOSHI PRAKASH ARUMUGASAMY MANJARI BAGCHI DEBADES BANDYOPADHYAY AVISHEK BASU NEELAM DHANDA BATRA SURYARAO BETHAPUDI ARPITA CHOUDHARY KISHALAY DE L. DEY A. GOPAKUMAR Y. GUPTA M. A. KRISHNAKUMAR YOGESH MAAN P. K. MANOHARAN ARUN NAIDU RANA NANDI DHRUV PATHAK MAYURESH SURNIS ABHIMANYU SUSOBHANAN
Radio pulsars show remarkable clock-like stability, which make them useful astronomy tools in experiments to test equation of state of neutron stars and detecting gravitational waves using pulsar timing techniques. A brief review of relevant astrophysical experiments is provided in this paper highlighting thecurrent state-of-the-art of these experiments. A program to monitor frequently glitching pulsars with Indian radio telescopes using high cadence observations is presented, with illustrations of glitches detected in this program, including the largest ever glitch in PSR B0531 $+$ 21. An Indian initiative to discover sub-$\mu$Hz gravitational waves, called Indian Pulsar Timing Array (InPTA), is also described briefly, where time-of-arrival uncertainties and post-fit residuals of the order of $\mu$s are already achievable, comparable to other international pulsar timing array experiments. While timing the glitches and their recoveries are likely to provide constraints on the structure of neutron stars, InPTA will provide upper limits on sub-$\mu$Hz gravitational waves apart from auxiliary pulsarscience. Future directions for these experiments are outlined.
BHAL CHANDRA JOSHI1 PRAKASH ARUMUGASAMY1 MANJARI BAGCHI2 3 DEBADES BANDYOPADHYAY4 AVISHEK BASU1 NEELAM DHANDA BATRA5 6 SURYARAO BETHAPUDI7 ARPITA CHOUDHARY2 KISHALAY DE8 L. DEY9 A. GOPAKUMAR9 Y. GUPTA1 M. A. KRISHNAKUMAR1 10 YOGESH MAAN11 P. K. MANOHARAN1 10 ARUN NAIDU12 RANA NANDI13 DHRUV PATHAK2 3 MAYURESH SURNIS14 15 ABHIMANYU SUSOBHANAN9
Volume 43, 2022
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