Title:	Evidence for profile changes in PSR J1713+0747 using the uGMRT
Authors:	Singha, Jaikhomba Surnis, Mayuresh P. Joshi, Bhal Chandra Tarafdar, Pratik Rana, Prerna Susobhanan, Abhimanyu Girgaonkar, Raghav Kolhe, Neel Agarwal, Nikita Desai, Shantanu Prabu, T. Bathula, Adarsh Dandapat, Subhajit Dey, Lankeswar Hisano, Shinnosuke Kato, Ryo Kharbanda, Divyansh Kikunaga, Tomonosuke Marmat, Piyush Susarla, Sai Chaitanya Bagchi, Manjari Batra, Neelam Dhanda Choudhury, Arpita Gopakumar, A. Gupta, Yashwant Krishnakumar, M.A. Maan, Yogesh Manoharan, P.K. Nobleson, K. Pandian, Arul Pathak, Dhruv Takahashi, Keitaro
Issue Date:	Aug-2021
Publisher:	Oxford University Press on behalf of the Royal Astronomical Society
Citation:	Monthly Notices of Royal Astronomical Society, 2021, Vol. 507, L57-L61
Abstract:	PSR J1713+0747 is one of the most precisely timed pulsars in the international pulsar timing array experiment. This pulsar showed an abrupt profile shape change between 2021 April 16, (MJD 59320) and 2021 April 17 (MJD 59321). In this paper, we report the results from multi-frequency observations of this pulsar carried out with the upgraded Giant Metrewave Radio Telescope (uGMRT) before and after the event. We demonstrate the profile change seen in Band 5 (1260 MHz–1460 MHz) and Band 3 (300 MHz–500 MHz). The timing analysis of this pulsar shows a disturbance accompanying this profile change followed by a recovery with a time-scale of ∼159 days. Our data suggest that a model with chromatic index as a free parameter is preferred over models with combinations of achromaticity with DM bump or scattering bump. We determine the frequency dependence to be ∼ν+1.34.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/7844
ISSN:	0035-8711 1365-2966 (Online)
Alternative Location:	https://arxiv.org/abs/2107.04607 https://doi.org/10.1093/mnrasl/slab098 https://ui.adsabs.harvard.edu/abs/2021MNRAS.507L..57S/abstract
Copyright:	2021 The Author(s)
Appears in Collections:	Research Papers(EEG)

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