IIA Institutional Repository: Recent submissions

  • GRB 230204B: GIT discovery of a fast fading afterglow associated with an energetic gamma-ray burst from a massive star progenitor 
    Swain, Vishwajeet; Bhalerao, Varun; Kumar, Harsh; Goyal, Mehul; Ghosh, Ankur; Pathak, Utkarsh; Chandra, Poonam; Ahumada, Tomas; Anupama, G. C; Bala, S; Barway, Sudhanshu; Bloom, Joshua S; Dimple; Karambelkar, Viraj; Kasliwal, Mansi M; Misra, K; Purdum, Josiah; Saraogi, Divita; Sollerman, Jesper; Suresh, Aswin; van der Walt, Stéfan; Waratkar, Gaurav (American Astronomical Society, 2026-03-20)
    We present a comprehensive multiwavelength study of a bright gamma-ray burst GRB 230204B, analyzing both prompt and afterglow emissions. This GRB is highly energetic, with an isotropic equivalent energy emission of Eiso ...
  • Detection of time delay between UV and X-ray variability in Mrk 1044 using AstroSat observations 
    Reshma, M; Stalin, C. S; Mandal, A. K; Kayal, Abhijit; Gudennavar, S. B; Joseph, P (Elsevier B.V., 2026-03)
    Active galactic nuclei are known to exhibit flux variations across the entire electromagnetic spectrum. Among these, correlations between UV/optical and X-ray flux variations serve as a key diagnostics for understanding ...
  • The polytropic behaviour and turbulence properties of sub-Alfvénic intervals 
    Choraghe, Komal; Mishra, Wageesh; Khuntia, Soumyaranjan (Oxford University Press on behalf of Royal Astronomical Society, 2026-03)
    The solar wind at 1 au is primarily super-Alfvénic, butrare instances occur when the Alfvén speed surpassesthe solar wind speed, resulting in occurrences of sub-Alfvénic intervals. During sub-Alfvénic intervals, the solar ...
  • Nine years of UVIT: Assessing sensitivity variation 
    Dagore, A; Joseph, P; Tandon, S. N; Subramaniam, A; Ghosh, S. K; Stalin, C. S (American Astronomical Society, 2026-03)
    The Ultra-Violet Imaging Telescope (UVIT) is one of the five payloads on board the first Indian multiwavelength astronomical observatory, AstroSat, launched by the Indian Space Research Organisation on 2015 September 28. ...
  • The GMRT archive atomic gas survey – III. comparative study of dark matter haloes in nearby galaxies 
    Sarkar, Sougata; Biswas, Prerana; Kalinova, Veselina; Roy, Nirupam; Patra, Narendra Nath; Kurapati, Sushma (Oxford University Press on behalf of Royal Astronomical Society, 2026-03)
    The distribution of dark matter in the inner regions of galaxies poses a key challenge for small-scale Lambda-cold dark matter (Λ-CDM) cosmology. While CDM simulations predict cuspy inner density profiles, observations ...
  • Retrieval of precipitable water vapor from sun–sky radiometer (POM-01) at 940 nm absorption band: Calibration, measurement and validation 
    Mukhopadhyay, Swagata; Shantikumar, N. S; Uchiyama, Akihiro; Jorphail, S; Vivek, Chiranjeevi G; Shrungeshwara, T. S; Sreedevi, P; Matsunaga, Tsuneo; Sharma, S; Gupta, Pawan; Angchuk, D; Jade, S (Elsevier B.V., 2026-03-01)
    Sun–sky radiometer (model POM-01) is commonly used for studying aerosol optical and physical properties at selected aerosol-specific channels. Although the instrument is equipped with a precipitable water vapor (PWV) channel ...
  • UOCS-XIX. a multiwavelength study of open cluster Trumpler 5: Cluster properties and exotic populations 
    Chand, Komal; Panthi, Anju; Vaidya, Kaushar (American Astronomical Society, 2026-03)
    Trumpler 5 is a populous, intermediate-age (∼3 Gyr), metal-poor ([Fe/H] ∼ −0.4) open cluster, located at a distance of approximately ∼3050 pc. This is a well-studied cluster for its broadened main-sequence (MS) and blue ...
  • Unveiling SN 2022eyw: A bright member of the Type Iax supernova subclass 
    Das, Hrishav; Sahu, D. K; Dutta, Anirban; Singh, Mridweeka; Anupama, G. C; Teja, Rishabh Singh (American Astronomical Society, 2026-03-01)
    We present comprehensive photometric and spectroscopic observations of SN 2022eyw, a luminous member of the Type Iax supernova (SN Iax) subclass. SN 2022eyw reached a peak absolute magnitude of Mg = –17.80 ± 0.15 mag and ...
  • Probing the CME core–prominence relation using observations of the inner corona 
    Pradhan, Sunit Sundar; Joshi, Jayant; Samanta, T (American Astronomical Society, 2026-03-10)
    Coronal mass ejections (CMEs) often exhibit a three-part structure consisting of a bright inner core, an outer leading edge, and an intervening dark cavity. While the core has traditionally been attributed to prominence ...
  • Modeling the time-variable broadband emission and correlation study of FSRQ S5 1044+71 
    Ahanger, Sajad; Shah, Zahir; Sahayanathan, S; Iqbal, Naseer; Malik, Zahoor; Manzoor, Aaqib (American Astronomical Society, 2026-03-10)
    We present a detailed temporal and spectral analysis of the blazar S5 1044+71 using multiwavelength data obtained from the Fermi-LAT and Swift-XRT/UVOT telescopes. Applying the Bayesian block algorithm to the 3-day binned ...
  • On the origin of coronal picoflare jets 
    Bura, Annu; Nobrega-Siverio, Daniel; Samanta, T; Joshi, Jayant (American Astronomical Society, 2026-03-20)
    Small-scale jet-like eruptions, such as picoflare jets and jetlets, are recognized as potential contributors to coronal heating and solar wind acceleration, yet their physical origin is still not fully established. Using ...
  • Energy and mass transport associated with impulsive spicular flows in solar coronal holes 
    Ni, Lei; Lin, Jun; Samanta, T; Cheng, Guanchong; Wang, Yifu; Erdelyi, Robertus (American Astronomical Society, 2026-03-20)
    How the solar atmosphere is heated from a temperature of about 5000 to 6000 K in the lower atmosphere to about 1–2 MK in the corona has challenged the astrophysical community for nearly 80 yr. The same puzzle exists for ...
  • Detection of quasi-periodic oscillations in the 37 GHz radio light curve of the blazar Ton 599 during 1990─2020 
    Gupta, A. C; Volvach, A. E; Kishore, Shubham; Volvach, L. N; Wiita, P. J; Cui, Lang; Valtonen, Mauri J; Mondal, Sandeep K; Gaur, H (EDP Sciences, 2026-03)
    Context. Blazars are a subclass of radio-loud active galactic nuclei (AGN) that display strong multi-wavelength variability on diverse timescales ranging from years down to minutes. In the last 1.5 decades, there have been ...
  • Probing generalized emergent dark energy with DESI DR2 
    Sharma, Vipin Kumar; Chaudhary, Himanshu; Kolekar, Sanved (Elsevier B.V., 2026-03)
    As an update on the initial findings of DESI, the new results provide the first hint of potential deviations from a cosmological constant (𝜔 = −1), which, if confirmed with significance > (2 − 4)𝜎, would challenge the ...
  • Variability study and searching for quasiperiodic oscillations with day-like periods in the blazar S5 0716+714 with TESS 
    Kishore, Shubham; Gupta, A. C; Wiita, P. J (American Astronomical Society, 2026-02-20)
    Using an unprecedented cadence of 30 minutes provided by the Transiting Exoplanet Survey Satellite, we have examined the optical light curves (LCs) of the blazar S5 0716+714 obtained from its Sectors 40, 47, and 53 over ...
  • Fluctuation dynamos in supersonic turbulence at Pm ≳ 1 
    Nagdeo, Ameya Uday; Sur, Sharanya; Vaidya, Bhargav (American Astronomical Society, 2026-02-20)
    Fluctuation dynamos provide a robust mechanism for amplifying weak seed magnetic fields in turbulent astrophysical plasmas. However, their behaviour in the highly compressible regimes characteristic of the interstellar ...
  • Unveiling the dual nature of V1180 cas: UXor-like dips and EXor-like bursts across a decade 
    Chand, Tarak; Sharma, Saurabh; Singh, Koshvendra; Ninan, J. P; Ghosh, Arpan; Ojha, D. K; Baug, Tapas; Sahu, D. K; Bhatt, B. C; Pramod Kumar, S; Yadav, R. K; Panwar, Neelam; Verma, Aayushi; Kaur, Harmeen; Mamta; Chakraborty, Manojit; Gokhe, Kartik; Singh, Ajay Kumar (American Astronomical Society, 2026-02-20)
    We present a detailed analysis of the long-term photometric and spectroscopic evolution of V1180 Cas over a decade, aiming to identify the dominant mechanisms behind its variability. We combine multiband light curves from ...
  • Probing accretion dynamics and spin evolution in the X-ray pulsar RX J0520.5–6932 during its 2024 outburst 
    Rahul, Sharma; Beri, Aru; Paul, B; Sanna, Andrea; Maitra, Chandreyee; Yang, Haonan (EDP Sciences, 2026-02)
    Context. After nearly a decade of quiescence, the transient Be/X-ray binary pulsar RX J0520.5–6932 underwent an outburst in 2024. Weperformed X-ray monitoring of the source with NICER and AstroSat near the peak of the ...
  • A multi wavelength study of novae in M31 
    Basu, Judhajeet (Indian Institute of Astrophysics, 2025-08)
    We present a comprehensive multi-wavelength study of extragalactic novae, with particular emphasis on rapidly recurring systems and their ultraviolet (UV) properties. Novae are thermonuclear runaway reactions that occur ...
  • Kinematics and thermodynamics of coronal mass ejections 
    Khuntia, Soumyaranjan (Indian Institute of Astrophysics, 2025-09)
    Coronal Mass Ejections (CMEs) are powerful solar eruptions that expel magnetized plasma into the heliosphere, often triggering severe space weather disturbances at Earth. While their large-scale kinematics and magnetic ...

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