Barnali Das

Research Scholar
Email: barnali [at]
Phone: +91 - 20 - 25719451
Extn: 9451
Office: F255
National Centre for Radio Astrophysics
Tata Institute of Fundamental Research
Savitribai Phule Pune University Campus,
Pune 411 007
Maharashtra, INDIA

Main Research Areas: Coherent radio emission from hot magnetic stars

Supervisor: Poonam Chandra


Barnali completed her B.Sc. in Physics from Hansraj College, New Delhi, in 2014, and then her M.Sc. in Physics from the Indian Institute of Technology, Kanpur, in 2016. She joined NCRA-TIFR for her doctoral studies in 2016 and completed the Graduate School courses and research projects in 2018. She is now working with Poonam Chandra for her doctoral research.

Research description:

Radio emissions from hot stars are usually generated by thermal free-free emission. However, a subset of these hot stars are found to possess strong, ordered magnetic fields, and, in around 25% of these hot magnetic stars, radio emission is dominated by gyro-synchrotron emission instead of free-free emission. Out of these hot stars with gyro-synchrotron emission, only two stars have been discovered to be capable of emitting coherently in radio. Barnali is studying these two special stars and trying to extract information about the stellar magnetosphere from the observed properties of coherent emission. She is also working on a project that aims at discovering more such stars and thus answering the question of when a hot magnetic star can emit coherently.

Selected publications:

1. The fifth main-sequence magnetic B-type star showing coherent radio emission: Is this really a rare phenomenon?  (Barnali Das, Poonam Chandra, Matt E. Shultz and Gregg A. Wade, 2019, MNRAS (Letters), 489, L102)

2. The accelerating rotation of the magnetic He-weak star HD 142990 (Matt E. Shultz, Th.
Rivinius, Barnali Das, Gregg A. Wade and Poonam Chandra, MNRAS, 486, 5558)

3. 'Detection of coherent radio emission from the Bp star HD 142990 at uGMRT frequencies
(Barnali Das, Poonam Chandra, Matt E. Shultz and Gregg A. Wade, ApJ, 877, 123)

4.  Discovery of electron cyclotron MASER emission from the magnetic Bp star HD 133880 with the Giant Metrewave Radio Telescope (Barnali Das, Poonam Chandra & Gregg A. Wade, 2018, MNRAS, 474, L61)

5. Non-minimally coupled dark fluid in Schwarzschild spacetime, Barnali Das & Kaushik Bhattacharya, 2017, General Relativity and Gravitation, 49, 63