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The Indian Pulsar Timing Array: First data release

Published online by Cambridge University Press:  24 October 2022

Pratik Tarafdar Open the ORCID record for Pratik Tarafdar [Opens in a new window] ,
K Nobleson Open the ORCID record for K Nobleson [Opens in a new window] ,
Prerna Rana Open the ORCID record for Prerna Rana [Opens in a new window] ,
Jaikhomba Singha Open the ORCID record for Jaikhomba Singha [Opens in a new window] ,
M. A. Krishnakumar Open the ORCID record for M. A. Krishnakumar [Opens in a new window] ,
Bhal Chandra Joshi Open the ORCID record for Bhal Chandra Joshi [Opens in a new window] ,
Avinash Kumar Paladi Open the ORCID record for Avinash Kumar Paladi [Opens in a new window] ,
Neel Kolhe Open the ORCID record for Neel Kolhe [Opens in a new window] ,
Neelam Dhanda Batra Open the ORCID record for Neelam Dhanda Batra [Opens in a new window]  and
Nikita Agarwal Open the ORCID record for Nikita Agarwal [Opens in a new window]
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Pratik Tarafdar*
Affiliation:
The Institute of Mathematical Sciences, CIT Campus, Taramani, Chennai, Tamil Nadu 600113, India
K Nobleson
Affiliation:
Department of Physics, BITS Pilani Hyderabad Campus, Hyderabad, Telangana 500078, India
Prerna Rana
Affiliation:
Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, Colaba, Mumbai 400005, India
Jaikhomba Singha
Affiliation:
Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
M. A. Krishnakumar
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany Fakultät für Physik, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany
Bhal Chandra Joshi
Affiliation:
National Centre for Radio Astrophysics, Pune University Campus, Pune 411007, India
Avinash Kumar Paladi
Affiliation:
Department of Earth & Space Sciences, IIST Thiruvananthapuram, Thiruvananthapuram, Kerala 695547, India
Neel Kolhe
Affiliation:
Department of Physics, St. Xavier’s College (Autonomous), Mumbai, Maharashtra 400001, India
Neelam Dhanda Batra
Affiliation:
Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India
Nikita Agarwal
Affiliation:
Department of Electronics and Communication Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
Adarsh Bathula
Affiliation:
Department of Physics, Indian Institute of Science Education and Research, Mohali, Punjab 140306, India
Subhajit Dandapat
Affiliation:
Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, Colaba, Mumbai 400005, India
Shantanu Desai
Affiliation:
Department of Physics, IIT Hyderabad, Kandi, Telangana 502284, India
Lankeswar Dey
Affiliation:
Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, Colaba, Mumbai 400005, India National Centre for Radio Astrophysics, Pune University Campus, Pune 411007, India
Shinnosuke Hisano
Affiliation:
Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
Prathamesh Ingale
Affiliation:
Fergusson College (Autonomous), Pune, Maharashtra 411004, India
Ryo Kato
Affiliation:
Osaka Central Advanced Mathematical Institute, Osaka Metropolitan University, Osaka 5588585, Japan Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
Divyansh Kharbanda
Affiliation:
Department of Physics, IIT Hyderabad, Kandi, Telangana 502284, India
Tomonosuke Kikunaga
Affiliation:
Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
Piyush Marmat
Affiliation:
Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
B. Arul Pandian
Affiliation:
Raman Research Institute, Bengaluru, Karnataka, India
T. Prabu
Affiliation:
Raman Research Institute, Bengaluru, Karnataka, India
Aman Srivastava
Affiliation:
Department of Physics, IIT Hyderabad, Kandi, Telangana 502284, India
Mayuresh Surnis
Affiliation:
Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK
Sai Chaitanya Susarla
Affiliation:
School of Mathematics, National University of Ireland Galway, University Road, Galway H91TK33, Ireland
Abhimanyu Susobhanan
Affiliation:
National Centre for Radio Astrophysics, Pune University Campus, Pune 411007, India Center for Gravitation, Cosmology, and Astrophysics, University of Wisconsin-Milwaukee, Wisconsin 53211, USA
Keitaro Takahashi
Affiliation:
Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan International Research Organization for Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
P. Arumugam
Affiliation:
Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Manjari Bagchi
Affiliation:
The Institute of Mathematical Sciences, CIT Campus, Taramani, Chennai, Tamil Nadu 600113, India Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India
Sarmistha Banik
Affiliation:
Department of Physics, BITS Pilani Hyderabad Campus, Hyderabad, Telangana 500078, India
Kishalay De
Affiliation:
MIT Kavli Institute for Astrophysics and Space Research, 77 Massachusetts Ave, Cambridge, MA 02139, USA
Raghav Girgaonkar
Affiliation:
Amity Centre of Excellence in Astrobiology, Amity University Mumbai, Mumbai, Maharashtra 410206, India
A. Gopakumar
Affiliation:
Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Navy Nagar, Colaba, Mumbai 400005, India
Yashwant Gupta
Affiliation:
National Centre for Radio Astrophysics, Pune University Campus, Pune 411007, India
Yogesh Maan
Affiliation:
National Centre for Radio Astrophysics, Pune University Campus, Pune 411007, India
P. K. Manoharan
Affiliation:
Arecibo Observatory, University of Central Florida, Arecibo 00612, USA
Arun Naidu
Affiliation:
University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX13RH, UK
Dhruv Pathak
Affiliation:
The Inter-University Centre for Astronomy and Astrophysics, Pune 411007, India
*
Corresponding author: Pratik Tarafdar, email pratikta16@gmail.com
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Abstract

We present the pulse arrival times and high-precision dispersion measure estimates for 14 millisecond pulsars observed simultaneously in the 300 $-$ 500 MHz and 1260 $-$ 1460 MHz frequency bands using the upgraded Giant Metrewave Radio Telescope. The data spans over a baseline of 3.5 years (2018-2021), and is the first official data release made available by the Indian Pulsar Timing Array collaboration. This data release presents a unique opportunity for investigating the interstellar medium effects at low radio frequencies and their impact on the timing precision of pulsar timing array experiments. In addition to the dispersion measure time series and pulse arrival times obtained using both narrowband and wideband timing techniques, we also present the dispersion measure structure function analysis for selected pulsars. Our ongoing investigations regarding the frequency dependence of dispersion measures have been discussed. Based on the preliminary analysis for five millisecond pulsars, we do not find any conclusive evidence of chromaticity in dispersion measures. Data from regular simultaneous two-frequency observations are presented for the first time in this work. This distinctive feature leads us to the highest precision dispersion measure estimates obtained so far for a subset of our sample. Simultaneous multi-band upgraded Giant Metrewave Radio Telescope observations in 300 $-$ 500 MHz and 1260 $-$ 1460 MHz are crucial for high-precision dispersion measure estimation and for the prospect of expanding the overall frequency coverage upon the combination of data from the various Pulsar Timing Array consortia in the near future. Parts of the data presented in this work are expected to be incorporated into the upcoming third data release of the International Pulsar Timing Array.

Keywords

radio telescopesradio astronomyastronomy data analysispulsar timing methodmillisecond pulsars
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 39 , 2022 , e053
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of the Astronomical Society of Australia

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