ItemArticle

Effects of coronal mass ejection on PSR J1022+1001 and possible mode change of PSR J2145 - 0750 in the InPTA DR2

Title
Effects of coronal mass ejection on PSR J1022+1001 and possible mode change of PSR J2145 - 0750 in the InPTA DR2
Creator
Chowdhury, Shaswata; Krishnakumar, M.A.; Bagchi, Manjari; Joshi, Bhal Chandra; Nobleson, K.; Jose, Jibin; Desai, Shantanu; Singh, Manpreet; Vyasraj, Vaishnavi; Meena, Kuldeep; Amarnath; Chakraborty, Manoneeta; Kala, Shubham; Deb, Debabrata; Zuraiq, Zenia; Pandian B, Arul; Dhanda Batra, Neelam; Dwivedi, Churchil; Mondal, Sushovan; Paladi, Avinash Kumar; Rai, Kaustubh; Susobhanan, Abhimanyu; Shukla, Adya; Srivastava, Aman; Surnis, Mayuresh; Tahbildar, Hemanga; Takahashi, Keitaro; Tarafdar, Pratik; Thiagaraj, Prabu; Vara, Kunjal
Description
The Indian Pulsar Timing Array (InPTA) has recently published its second data release (DR2), comprising the timing analysis of seven years of data on 27 millisecond pulsars (MSPs), observed simultaneously in the 300 - 500 MHz (band 3) and 1260 - 1460 MHz (band 5), using the upgraded Giant Metrewave Radio Telescope (uGMRT). The low-frequency data, particularly in band 3, is highly sensitive to propagation effects such as dispersion measure (DM) fluctuations, which can be imprints of some astrophysical phenomena (scientific outliers). Here, we analyze the two outliers of possible astrophysical origin coming from the band 3 DM time series of two pulsars: PSR J1022+1001, with an ecliptic latitude of ?0.06?, and PSR J2145 - 0750, one of the brightest MSPs, with multi-component profile morphology. Our study reveals compelling evidence for a coronal mass ejection (CME) event traced in the data of PSR J1022+1001, and reports evidence for a potential mode-changing event in PSR J2145 - 0750. By contrasting these two cases, we show that DM fluctuations due to CME interacions and intrinsic mode-changing events produce distinct observational signatures, enabling a physically informed classification of scientific outliers in PTA datasets. Extending the analyses presented here to the full sample of InPTA-DR2 pulsars is expected to reveal additional CME events, and possible mode-changing events. Such detections will not only improve our understanding of solar and pulsar magnetospheric plasma interactions but will also enable more accurate modelling of DM variations, leading to improved pulsar timing solutions, which are crucial for high-precision Pulsar Timing Array (PTA) science. 2026 Elsevier B.V.
Source
Journal of High Energy Astrophysics;Volume;51;Issue;;Article No.;100547;
Date
01-01-2026
Publisher
Elsevier B.V.
Subject
Gravitational wave background; Mode change; Pulsar; Sun
Coverage
Chowdhury S., The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai, 600113, India; Krishnakumar M.A., Radio Astronomy Centre, National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Udhagamandalam, 643001, India; Bagchi M., The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai, 600113, India, Training School Complex, Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400094, India; Joshi B.C., National Centre for Radio Astrophysics, SP Pune University Campus, Maharashtra, Pune, 411007, India, Department of Physics, Indian Institute of Technology Roorkee, Uttarakhand, Roorkee, 247667, India; Nobleson K., Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan; Jose J., Department of Astronomy, Astrophysics, and Space Engineering, Indian Institute of Technology Indore, Indore, 453552, India; Desai S., Department of Physics, IIT Hyderabad, Telangana, Kandi, 502284, India; Singh M., Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, SAS Nagar, Punjab, Mohali, 140306, India; Vyasraj V., Department of Physics, IIT Hyderabad, Telangana, Kandi, 502284, India; Meena K., UM-DAE Centre for Excellence in Basic Sciences, University of Mumbai, Vidyanagari Mumbai, 400098, India; Amarnath, Raman Research Institute, Karnataka, Bengaluru, 560080, India; Chakraborty M., Department of Astronomy, Astrophysics, and Space Engineering, Indian Institute of Technology Indore, Indore, 453552, India; Kala S., The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai, 600113, India; Deb D., Centre for Space Research, North-West University, Private Bag X6001, Potchefstroom, 2520, South Africa; Zuraiq Z., Department of Physics, Indian Institute of Science, C. V. Raman Avenue, Bengaluru, 560012, India; Pandian B A., Raman Research Institute, Karnataka, Bengaluru, 560080, India, Department of Physics and Electronics, The Christ (Deemed to be University), Bangalore, India; Dhanda Batra N., Department of Physics, Indian Institute of Technology, Hauz Khas, Delhi New Delhi, 110016; Dwivedi C., Astronomy and Astrophysics Division, Physical Research Laboratory, Thaltej Campus, Gujarat, Ahmedabad, 380059, India; Mondal S., The Institute of Mathematical Sciences, C. I. T. Campus, Taramani, Chennai, 600113, India, Training School Complex, Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400094, India; Paladi A.K., Department of Physics, Indian Institute of Science, C. V. Raman Avenue, Bengaluru, 560012, India; Rai K., Department of Physics, IISER Bhopal, Bhauri Bypass Road, Bhopal, 462066, India; Susobhanan A., Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Callinstra 38, Hannover, D-30167, Germany; Shukla A., Department of Physics, Indian Institute of Technology Roorkee, Uttarakhand, Roorkee, 247667, India; Srivastava A., Department of Physics, IIT Hyderabad, Telangana, Kandi, 502284, India, Department of Physics, GLA University, Mathura, 281406, India; Surnis M., Department of Physics, IISER Bhopal, Bhauri Bypass Road, Bhopal, 462066, India; Tahbildar H., Department of Physics, IISER Bhopal, Bhauri Bypass Road, Bhopal, 462066, India; Takahashi K., Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan; Tarafdar P., INAF - Osservatorio Astronomico di Cagliari, via della Scienza 5, Selargius (CA), 09047, Italy; Thiagaraj P., Raman Research Institute, Karnataka, Bengaluru, 560080, India; Vara K., Department of Physics, IISER Bhopal, Bhauri Bypass Road, Bhopal, 462066, India
Rights
All Open Access; Green Open Access
Relation
ISSN: 22144048;
Format
online
Language
English
Type
Article

Citation

Chowdhury, Shaswata; Krishnakumar, M.A.; Bagchi, Manjari; Joshi, Bhal Chandra; Nobleson, K.; Jose, Jibin; Desai, Shantanu; Singh, Manpreet; Vyasraj, Vaishnavi; Meena, Kuldeep; Amarnath; Chakraborty, Manoneeta; Kala, Shubham; Deb, Debabrata; Zuraiq, Zenia; Pandian B, Arul; Dhanda Batra, Neelam; Dwivedi, Churchil; Mondal, Sushovan; Paladi, Avinash Kumar; Rai, Kaustubh; Susobhanan, Abhimanyu; Shukla, Adya; Srivastava, Aman; Surnis, Mayuresh; Tahbildar, Hemanga; Takahashi, Keitaro; Tarafdar, Pratik; Thiagaraj, Prabu; Vara, Kunjal, “Effects of coronal mass ejection on PSR J1022+1001 and possible mode change of PSR J2145 - 0750 in the InPTA DR2,” CHRIST (Deemed To Be University) Institutional Repository, accessed June 18, 2026, https://archives.christuniversity.in/items/show/22349.

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