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Precision pulsar timing with the ORT and the GMRT and its applications in pulsar astrophysics

Joshi, Bhal Chandra and Arumugasamy, Prakash and Bagchi, Manjari and Bandyopadhyay, Debades and Basu, Avishek and Dhanda Batra, Neelam and Bethapudi, Suryarao and Choudhary, Arpita and De, Kishalay and Dey, L. and Gopakumar, A. and Gupta, Y. and Krishnakumar, M. A. and Maan, Yogesh and Manoharan, P. K. and Naidu, Arun and Nandi, Rana and Pathak, Dhruv and Surnis, Mayuresh and Susobhanan, Abhimanyu (2018) Precision pulsar timing with the ORT and the GMRT and its applications in pulsar astrophysics. Journal of Astrophysics and Astronomy, 39 (4). Art. No. 51. ISSN 0250-6335.

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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 the current 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-μ 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 μs 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-μ Hz gravitational waves apart from auxiliary pulsar science. Future directions for these experiments are outlined.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access
Joshi, Bhal Chandra0000-0002-0863-7781
Arumugasamy, Prakash0000-0003-2134-1878
Bagchi, Manjari0000-0001-8640-8186
Basu, Avishek0000-0002-4142-7831
Dhanda Batra, Neelam0000-0003-0266-0195
Bethapudi, Suryarao0000-0003-1611-0063
Choudhary, Arpita0000-0003-2031-1183
De, Kishalay0000-0002-8989-0542
Gupta, Y.0000-0001-5765-0619
Krishnakumar, M. A.0000-0003-4528-2745
Maan, Yogesh0000-0002-0862-6062
Manoharan, P. K.0000-0003-4274-211X
Nandi, Rana0000-0002-6277-2618
Pathak, Dhruv0000-0001-8129-0473
Surnis, Mayuresh0000-0002-9507-6985
Susobhanan, Abhimanyu0000-0002-2820-0931
Additional Information:© Indian Academy of Sciences 2018. MS received 12 July 2018; accepted 16 August 2018. The authors acknowledge help and support provided by the staff at Radio Astronomy Centre, Ooty and Giant Meterwave Radio Telescope during these observations. The ORT and the GMRT are operated by the National Centre for Radio Astrophysics. BCJ, MAK and PKM acknowledge support from DST-SERB Grant EMR/2015/000515. YM acknowledges use of the ERC funding from the (FP/2007-2013)/ERC Grant Agreement No. 617199.
Funding AgencyGrant Number
Science and Engineering Research Board (SERB)EMR/2015/000515
European Research Council (ERC)617199
Subject Keywords:Equation of state—gravitational waves—pulsars: general—stars: neutron
Issue or Number:4
Record Number:CaltechAUTHORS:20180830-105710817
Persistent URL:
Official Citation:Joshi, B.C., Arumugasamy, P., Bagchi, M. et al. J Astrophys Astron (2018) 39: 51.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89315
Deposited By: George Porter
Deposited On:30 Aug 2018 19:42
Last Modified:03 Oct 2019 20:15

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