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      https://www.ias.ac.in/article/fulltext/joaa/037/04/0030

    • Keywords

       

      Radiation mechanisms: non-thermal; techniques: interferometric; gamma-ray bursts: general; supernovae: general; novae, cataclysmic variables.

    • Abstract

       

      With the high sensitivity and wide-field coverage of the Square Kilometre Array (SKA), large samples of explosive transients are expected to be discovered. Radio wavelengths, especially in commensal survey mode, are particularly well-suited for uncovering the complex transient phenomena. This is because observations at radio wavelengths may suffer less obscuration than in other bands (e.g. optical/IR or X-rays) due to dust absorption. At the same time, multiwaveband information often provides critical source classification rapidly than possible with only radio band data. Therefore, multiwaveband observational efforts with wide fields of view will be the key to progress of transients astronomy from the middle 2020s offering unprecedented deep images and high spatial and spectral resolutions. Radio observations of Gamma Ray Bursts (GRBs) with SKA will uncover not only much fainter bursts and verifying claims of sensitivity-limited population versus intrinsically dim GRBs, they will also unravel the enigmatic population of orphan afterglows. The supernova rate problem caused by dust extinction in optical bands is expected to be lifted in the SKA era. In addition, the debate of single degenerate scenario versus double degenerate scenario will be put to rest for the progenitors of thermonuclear supernovae, since highly sensitive measurements will lead to very accurate mass loss estimation in these supernovae. One also expects to detect gravitationally lensed supernovae in far away Universe in the SKA bands. Radio counterparts of the gravitational waves are likely to become a reality once SKA comes online. In addition, SKA is likely to discover various new kinds of transients.

    • Author Affiliations

       

      Poonam Chandra1 G. C. Anupama2 K. G. Arun3 Shabnam Iyyani4 Kuntal Misra5 D. Narasimha4 Alak Ray4 L. Resmi6 Subhashis Roy1 Firoza Sutaria2

      1. National Centre for Radio Astrophysics, TIFR, Ganeshkhind, Pune 411 007, India.
      2. Indian Institute of Astrophysics, II Block, Koramangala, Bangalore 560 034, India.
      3. Chennai Mathematical Institute, Siruseri 603 103, India.
      4. Tata Institute of Fundamental Research, Dr. Homi Bhabha Road, Colaba Mumbai 400 005, India.
      5. Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital 263 002, India.
      6. Indian Institute of Space Science and Technology, Thiruvananthapuram 695 547, India
    • Dates

       
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