IIAP Publications: Recent submissions

  • 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 ...
  • Backtracking bipolar magnetic regions to their emergence: Two groups and their implication in the tilt measurements 
    Sreedevi, Anu; Karak, B. B; Jha, Bibhuti K; Gupta, Rambahadur; Banerjee, D (American Astronomical Society, 2026-01-01)
    Bipolar magnetic regions (BMRs) that appear on the solar photosphere are surface manifestations of the Sun's internal magnetic field. With modern observations and continuous data streams, the study of BMRs has moved from ...
  • The jetted tidal disruption event at 2022cmc: Investigating connections to the optical tidal disruption event population and spectral subclasses through late-time follow-up 
    Hammerstein, Erica; Cenko, S. Bradley; Andreoni, Igor; Charalampopoulos, Panos; Chornock, R; Margutti, R; O’Connor, Brendan; Schulze, Steve; Sollerman, Jesper; Barway, Sudhanshu; Bhalerao, Varun; Anupama, G. C; Kumar, Harsh; Marini, Ester; Paris, Diego; Perley, Daniel A; Rossi, Andrea; Yao, Yuhan (American Astronomical Society, 2026-01-10)
    AT 2022cmc is the first on-axis jetted tidal disruption event (TDE) to be discovered at optical wavelengths. The optically bright nature of AT 2022cmc presents an unprecedented opportunity to place this jetted TDE in the ...
  • GRB 250704B: An off-axis short GRB with a long-lived afterglow plateau 
    Swain, Vishwajeet; Ahumada, Tomas; Patil, Sameer K; Wagh, Yogesh; Bhalerao, Varun; Nakar, E; Kasliwal, Mansi; Hall, Xander J; Busmann, Malte; Pathak, Utkarsh; Anand, Shreya; Karambelkar, Viraj; Andreoni, Igor; Anupama, G. C; Arya, Anuraag; Balasubramanian, Arvind; Barway, Sudhanshu; Carney, Jonathan; Coughlin, Michael W; Eappachen, D; Freeburn, James; Gruen, Daniel; Mohan, Tanishk; O’Connor, Brendan; Palmese, Antonella; Sahu, D. K; Saikia, Aditya Pawan; Sarin, Nikhil; Srinivasaragavan, Gokul P; Tanenia, Hitesh (American Astronomical Society, 2026-01-10)
    We present a detailed multiwavelength afterglow study of the short gamma-ray burst (GRB) GRB 250704B, extensively monitored in optical and near-infrared bands. Its afterglow displays an unusually long duration plateau ...
  • Discovery of a years-delayed radio flare from an unusually slowly evolving tidal disruption event candidate 
    Zhang, Zhumao; Shu, Xinwen; Yang, Lei; Sun, Luming; Ding, Hucheng; Yan, Lin; Jiang, Ning; An, Fangxia; Silima, Walter; Zhang, Fabao; Chandola, Yogesh; Wu, Zhongzu; Liu, Daizhong; Dou, L; Wang, Jianguo; Wang, Yibo; Yang, Chenwei; Li, Di; Zhou, Tianyao; Zhang, Wenjie; Peng, Fangkun; Wang, Tinggui (American Astronomical Society, 2026-01-20)
    SDSS J1115+0544 is a unique low-ionization nuclear emission-line region galaxy with energetic ultraviolet (UV), optical, and mid-infrared outbursts occurring in its nucleus. We present the results from an analysis of ...
  • Hemispheric magnetic asymmetry and cross-equatorial circulation cells within the sun’s near-surface shear layer 
    Sen, Anisha; Rajaguru, S. P; Chen, Ruizhu; Zhao, Junwei; Kholikov, S (American Astronomical Society, 2026-01-20)
    Using time─distance helioseismic measurements of meridional flow in the near-surface shear layer over a period of 14 yr starting from 2010 May, we probe the depth structure and evolution of its cross-equatorial part. We ...
  • SN 2024 aecx: A double-peaked rapidly evolving type IIb supernova at 11Mpc 
    Zou, Xingzhu; Kumar, B; Teja, Rishabh Singh; Sahu, D. K; Chen, Xinlei; Singh, A; Lin, Weikang; Liu, Xiangkun; Liu, Dezi; Das, Hrishav; Singh, Mridweeka; Anupama, G. C; Pan, Yu; Du, Guowang; Guo, Helong; Wang, Tao; Zhu, Xufeng; Zhang, Jujia; Fang, Yuan; Liu, Chenxu; Chatterjee, Kaushik; Yang, Yuan Pie; Li, Liping; Zhai, Qian; Lagioia, Edoardo P; Du, Xueling; Er, Xinzhong; Lian, Jianhui; Li, Ziwei; Zhong, Shiyan; Liu, Xiaowei (American Astronomical Society, 2026-01-20)
    We present the results of low-resolution spectroscopic and densely sampled multiband photometric follow-up of supernova (SN) 2024aecx. The SN was discovered in the spiral galaxy NGC 3521 (distance ∼ 11 Mpc) within a day ...
  • TRAO survey of the nearby filamentary molecular clouds, the universal nursery of stars (TRAO-FUNS). IV. filaments and dense cores in the W40 and serpens south regions of aquila 
    Moharana, Satyajeet; Lee, Chang Won; Kim, Shinyoung; Chung, Eun Jung; Choudhury, Spandan; Tafalla, Mario; Kim, Jongsoo; Archana Soam; Koh, Donghyeok; Gupta, Shivani; Maheswar, G; Kwon, Woojin (American Astronomical Society, 2026-01-20)
    We present the results of molecular line observations toward the W40 and Serpens South regions of the Aquila molecular cloud complex, conducted as part of the Taeduk Radio Astronomy Observatory survey of Filaments, the ...
  • Characteristics of multi-layer clouds observed using ceilometer observations over Leh-Ladakh: A high-altitude cold desert region 
    Shah, Ruchita; Sharma, S; Kamat, Dharmendra; Kumar, Kondapalli Niranjan; Kumar, Prashant; Shantikumar, N. S; Angchuk, D; Srivastava, Rohit (Elsevier B.V, 2026-01)
    The Leh-Ladakh region is a high-altitude cold desert (3255 m above mean sea level), located under the rain shadow of the Himalayas, display various cloud features crucial to understand the extreme weather conditions. Global ...
  • Fermi-large area telescope detection of very high energy (>100 GeV) emission from misaligned jetted active galactic nuclei 
    Tomar, Gunjan; Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S (Elsevier B.V, 2026-01)
    The detection of very-high-energy (VHE; >100 GeV) 𝛾-ray radiation from misaligned jetted Active Galactic Nuclei (AGN) challenges the emission models that primarily explain VHE emissions from beamed AGN, i.e., blazars. ...
  • Characterizing EP241107a: Multiwavelength observations of an Einstein probe-detected fast X-ray transient 
    Eappachen, D; Balasubramanian, Arvind; Swain, Vishwajeet; Anupama, G. C; Sahu, D. K; Bhalerao, Varun; Ahumada, Tomas; Andreoni, Igor; Barway, Sudhanshu; Carney, J; Freeburn, James; Kasliwal, Mansi M; Mohan, Tanishk; Rodriguez, Antonio C; Waratkar, Gaurav (Oxford University Press on behalf of Royal Astronomical Society, 2026-01)
    Fast X-ray transients (FXTs) represent a new class of highly luminous transients in soft X-rays ( ∼0.3–10 keV) associated with violent astrophysical processes. They manifest as short, singular flashes of X-ray photons with ...
  • Estimating the masses of narrow line Seyfert 1 galaxies using damped random walk method 
    Rachana; Vivek, M; Shen, Yue (Oxford University Press on behalf of Royal Astronomical Society, 2026-01)
    Narrow-line Seyfert 1 galaxies (NLSy1s) are a subclass of active galactic nuclei (AGNs), commonly associated with rapidly accreting, relatively low-mass black holes (106 –108 M) hosted in spiral galaxies. Although typically ...
  • Venus as an exoplanet analogue: Extended UV transit signatures and coronal occultations 
    Tisyagupta, Pyne; Ravindra, B; Banyal, R. K (Oxford University Press on behalf of Royal Astronomical Society, 2026-01)
    Stellar activity manifests differently across wavelengths, causing flux variability that can obscure planetary transits. While transit observations are typically performed in the visible and infrared bands, where stellar ...
  • The vertical structure of the stellar disk in NGC 55 
    Raut, Harshal; Patra, Narendra Nath; Biswas, Prerana; Roy, Nirupam; Kalinova, Veselina; Dzib, Sergio; Colombo, Dario; Villanueva, Vicente; Sanchez, Sebastian F (EDP Sciences, 2025-07)
    Aims. This paper aims to self-consistently determine the 3D density distribution of the stellar disk in NGC 551 and to utilize it to study the observational signatures of two-component stellar disks (thin and thick) in ...
  • The VMC survey: LII. data release #7: Complete survey data and data from additional programmes 
    Cioni, Maria-Rosa L; Cross, N. J. G; Ripepi, V; Girardi, L; de Grijs, R; Clementini, G; van Loon, Jacco Th; Groenewegen, M. A. T; Ivanov, Valentin D; Oliveira, Joana M; Marconi, M; Bekki, K; Blake, R. P; Holliman, M. J; Irwin, J; Irwin, M. J; Mann, R. G; Read, M; Sutorius, E; Craig, J. E. M; Cusano, F; Dresbach, F; Maitra, Chandreyee; Molinaro, Roberto; Niederhofer, Florian; Omkumar, Abinaya O; Pennock, Clara M; Sicignano, T; Subramanian, S; Tatton, Ben L; Vijayasree, S; Zaggia, S (EDP Sciences, 2025-07)
    Context. The near-infrared Y JKs Visual and Infrared Survey Telescope for Astronomy (VISTA) survey of the Magellanic Clouds (VMC) is complete, along with data from additional programmes contributing to the enhancement of ...
  • Harvesting fermionic field entanglement in Schwarzschild spacetime 
    Dubey, Nitesh K; Kolekar, Sanved (American Physical Society, 2025-07-15)
    We explore entanglement harvesting using two Unruh-DeWitt (UDW) detectors linearly coupled to the scalar density of a massless spin-1=2 field in 1 þ 1 Schwarzschild spacetime. We consider different vacua, including the ...

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