Welcome to the Digital Repository of Indian Institute of Astrophysics

This digital repository of Indian Institute of Astrophysics (IIAP), Bangalore, India is developed to capture, organize disseminate and preserve the research publications of IIAP. It also includes the in-house technical reports and annual reports in addition to various other grey literatures created within the institute.You can search, browse and access full text of these publications from the repository.

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Recently Added

  • Relative strengths of fundamental and harmonic emissions of solar radio type ii bursts 
    Jha, Rishikesh G; Raja, K. S; Ramesh, R; Kathiravan, C; Monstein, C (Springer Nature, 2025-12)
    Solar radio type II bursts are slow-drifting bursts that exhibit various distinct features such as Fundamental (F) and Harmonic (H) emissions, band-splitting, and discrete fine structures in the dynamic spectra. Observationally, ...
  • Quasi-biennial oscillations and rieger-type periodicities in a babcock–leighton solar dynamo 
    Pawan Kumar, S; Ravindra, B; Chowdhury, Partha; Karak, B. B (EDP Sciences, 2026-01)
    Context. The Sun’s magnetic field exhibits the 11 year solar cycle as well as shorter periodicities, popularly known as the quasibiennial oscillations (QBOs) and Rieger-type periods. Although several theories have been ...
  • Broad-band modelling of the GRB 230812B afterglow: Implications for very-high-energy-ray detections with IACTs 
    Mohnani, S; Banerjee, Biswajit; Miceli, D; Nava, L; Oganesyan, G; Tiwari, P; Ierardi, A; De Santis, A. L; Macera, S; Shukla, A; Branchesi, M; Chatterjee, Swarna; Agarwal, Sushmita; Datta, Abhirup; Yadav, K. K; Anupama, G. C (EDP Sciences, 2026-01)
    A significant fraction of the energy from the gamma-ray burst (GRB) jets, after powering the keV─MeV emission, forms an ultra-relativistic shock propagating into the circum-burst medium. The particles in the medium accelerate ...
  • Dance to demise—how massive stars may form dense circumstellar shells before explosion 
    Sengupta, Sutirtha; Sujit, Das; Sarangi, Arkaprabha (American Astronomical Society, 2026-01-01)
    We investigate the evolution of red supergiant (RSG) progenitors of core-collapse supernovae (SNe) with initial masses between 12 and 20 M⊙, focusing on the effects of enhanced mass loss due to pulsation-driven instabilities ...
  • Radio follow-up observations of a weak-line quasar exhibiting remarkable x-ray variability 
    Chhipa, Ayushi; Vivek, M; Nayana, A. J; Kharb, P; Brandt, W. N; Jagannathan, Preshanth; Baghel, J; Ezhikode, Savithri H; Ishwara-Chandra, C. H (American Astronomical Society, 2026-01-01)
    SDSS J1539+3954 (z ≍ 1.935), a radio-quiet weak-line quasar (WLQ), exhibited exceptional X-ray variability in 2019─2020, with its X-ray flux increasing by over 20 times from 2013 to 2019 and subsequently dropping by at ...

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