IIAP Publications: Recent submissions

  • Changing-look active galactic nuclei: a study of optical/uv and the highly ionized fe kα x-ray line flux variations using photoionization simulations 
    Adhikari, T. P; Mondal, Santanu; He, Zhicheng; Rozanska, Agata; Hryniewicz, K (American Astronomical Society, 2025-07-20)
    Significant variability in broad emission line strengths of active galactic nuclei (AGN) over months to years has been observed, often accompanied by intrinsic continuum changes. Such spectral variability challenges the ...
  • Full non-LTE multi-level radiative transfer: I. An atom with three bound infinitely sharp levels 
    Lagache, T; Paletou, F; Sampoorna, M (EDP Sciences, 2025-07)
    Context. The standard nonlocal thermodynamic equilibrium (non-LTE) multi-level radiative transfer problem only takes into account the deviation of the radiation field and atomic populations from their equilibrium ...
  • The nature of optical afterglows without Gamma-ray bursts: Identification of AT2023lcr and multiwavelength modeling 
    Li, Maggie L; Ho, Anna Y. Q; Ryan, Geoffrey; Perley, Daniel A; Lamb, Gavin P; Nayana, A. J; Andreoni, Igor; Anupama, G. C; Bellm, Eric C; Berger, E; Bloom, Joshua S; Burns, Eric; Caiazzo, Ilaria; Chandra, P; Coughlin, Michael W; El-Badry, Kareem; Graham, Matthew J; Kasliwal, Mansi M; Keating, Garrett K; Kulkarni, S. R; Kumar, Harsh; Masci, Frank J; Perley, Richard A; Ramprasad Rao; Rodriguez, Antonio C; Rusholme, Ben; Sarin, Nikhil; Sollerman, Jesper; Srinivasaragavan, Gokul P; Swain, Vishwajeet; Vanderbosch, Zachary (American Astronomical Society, 2025-05-20)
    In the past few years, the improved sensitivity and cadence of wide-field optical surveys have enabled the discovery of several afterglows without associated detected gamma-ray bursts (GRBs). We present the identification, ...
  • Fabrication of liquid-crystal retarders for solar polarimetry: A facile method 
    Phanindra, D. V. S; Greeshma, L. S; Vincent, Della; Raees, Muhammed; Nagaraju, K; Hegde, Gurumurthy; Sreekumar, P; Namboothiry, Manoj A. G (Springer Nature, 2025-12)
    A high-precision polarimeter for simultaneous multi-line spectropolarimetric Sun observations is under development at Indian Institute of Astrophysics. Towards this end, we plan to use liquid-crystal retarders as the ...
  • UVIT data release version 7: Regenerated high-level UVIT data products 
    Joseph, P; Tandon, S. N; Ghosh, S. K; Stalin, C. S (Springer Nature, 2025-12)
    Ultra-Violet Imaging Telescope (UVIT) on board AstroSat is an active telescope capable of highresolution far-ultraviolet imaging (<1.5) and low-resolution (λ/δλ ≈ 100) slitless spectroscopy with a fieldof-view as large as ...
  • Transients and time domain astrophysics 
    Bhalerao, Varun; Misra, K; Anupama, G. C; Iyyani, S; Joshi, Jagdish C; Nayana, A. J; Resmi, L; Sahu, D. K; Tendulkar, Shriharsh (Springer Nature, 2025-12)
    Time Domain Astronomy (TDA) has ushered in a new era of cosmic exploration. This has been possible with the advanced sensitive surveys that have allowed the discovery and classification of transients to reach unprecedented ...
  • Sample of 25 radio galaxies with highly unusual radio morphologies, selected from the LoTSS-DR2 survey at 144 MHz 
    Krishna, G; Patra, Dusmanta; Joshi, Ravi (Springer Nature, 2025-12)
    From a careful visual scrutiny of the radio structures of a well-defined sample of 2428 sources in the LoTSS-DR2 survey made at 144 MHz with a 6 beam, we have selected a subset of 25 (i.e., 1%) sources showing highly unusual ...
  • Exoplanets 
    Puravankara, Manoj; Banyal, R. K; Majumdar, Liton; Goyal, Jayesh; Nandy, D; Chatterjee, Sourav; Narendranath, S; Tej, Anandmayee; Sivarani, T (Springer Nature, 2025-12)
    The study of exoplanets is one of the fastest-growing areas in astronomy. The number of known exoplanets has increased dramatically, providing new insights into the galaxy’s diversity and abundance of planetary systems. ...
  • Magnetic topology dependence of ionizing electrons on the Martian nightside ionosphere 
    Sarkar, Arnob; Rao, N. V; Pavan, D. G; Kadhane, Umesh R (Elsevier B.V., 2025-07-15)
    The interaction between the solar wind and Martian crustal magnetic fields plays a significant role in shaping electron precipitation in the ionosphere, particularly on the nightside. Using five years of data from the Mars ...
  • Characterization of aerosol optical and radiative properties at Leh, located over the climate sensitive Hindu Kush Himalayan region using sky radiometer observation 
    Shantikumar, N. S; Mukhopadhyay, Swagata; Madhavan, B. L; Srivastava, A. K; Sharma, Som K; Singh, Amarendra; Jorphel, Sonam; Angchuk, D; Mahay, T. T (Elsevier B.V, 2025-07-15)
    Aerosol optical and radiative properties over the Leh Ladakh, located in the climate sensitive Hindu Kush Himalayan region are examined using one year measurements from a newly installed sky radiometer from July 2023 ...
  • Low-velocity precessing jets can explain observed morphologies in the twin radio galaxy TRGJ104454+354055 
    Mondal, Santanu; Giri, Gourab; Joshi, Ravi; Wiita, P. J; Krishna, G; Ho, Luis C (American Astronomical Society, 2025-07-10)
    Our understanding of large-scale radio jets in merger systems has been drastically improved in the era of the Very Large Array, Very Long Baseline Array/European VLBI Network, upgraded Giant Metrewave Radio Telescope, and ...
  • Interpreting the spectrotemporal properties of the black hole candidate swift J151857.0-572147 during its first outburst in 2024 
    Chatterjee, Kaushik; Suribhatla, S. Pujitha; Mondal, Santanu; Singh, Chandra B (American Astronomical Society, 2025-07-01)
    The transient Galactic black hole candidate Swift J151857.0-572147 went through an outburst in 2024 March for the first time. Using publicly archived Insight-HXMT data, we have analyzed the timing and spectral properties ...
  • A pilot method to determine the high mass end of the stellar initial mass function in galaxies using UVIT, Hα-MUSE observations and applied to NGC 628 
    Amrutha, S; Mousumi Das (American Astronomical Society, 2025-07-01)
    We present a pilot method to estimate the high-mass initial mass function (IMF) across the arm, interarm, and spur regions in galaxies and apply it to NGC 628. We extracted star-forming complexes (SFCs) from the Hα Very ...
  • AstroSat/UVIT study of NGC 663: First detection of Be+sdOB systems in a young star cluster 
    Nedhath, Sneha; Rani, Sharmila; Subramaniam, A; Pancino, Elena (EDP Sciences, 2025-07)
    Context. Be stars are rapidly rotating stars surrounded by a disc; however, the origin of these stars remains unclear. Mass and angular momentum transfer in close binaries account for the rapid rotation of a major fraction ...
  • Spectroscopic quasar anomaly detection (SQuAD): I. Rest-frame UV spectra from SDSS DR16 
    Tiwari, A; Vivek, M (EDP Sciences, 2025-07)
    Aims. We present the results of applying anomaly detection algorithms to a quasar spectroscopic subsample from the SDSS DR16 quasar catalog, covering the redshift range of 1.88 ≤ z ≤ 2.47. Methods. A principal component ...
  • Radiative-transfer models for dusty Type II supernovae 
    Dessart, Luc; Hillier, D. J; Sarangi, Arkaprabha (EDP Sciences, 2025-05)
    Dust is expected to form on a year timescale in core-collapse supernova (SN) ejecta. Its existence is revealed through an infrared brightening, an optical dimming, or a blue-red emission-line profile asymmetry. To investigate ...
  • Circumgalactic medium of quasar host galaxies at 0.4 ⩽ z ⩽ 0.8 probed by strong Mg II absorption 
    Sharma, Paryag; Srianand, R; Chand, H; Guha, Labanya Kumar (Oxford University Press on behalf of Royal Astronomical Society, 2025-07)
    Using a sample of 166 projected quasar pairs, we investigate the influence of active galactic nuclei on the circumgalactic medium of the quasar host galaxies probed using strong Mg II absorption (i.e. W2796 ≥ 1 Å) at impact ...
  • The Hα line as a probe of chromospheric magnetic fields 
    Mathur, Harsh; Joshi, Jayant; Moe, Thore Espedal; Pereira, Tiago M. D; Nagaraju, K (American Astronomical Society, 2025-07-10)
    We explore the diagnostic potential of the Hα line for probing the chromospheric magnetic field using a realistic 3D radiative magnetohydrodynamic (rMHD) model. The Stokes profiles of the Hα line are synthesized through full ...
  • On the magnetic reconnection and its properties during a flare using a magnetohydrodynamics simulation 
    Nayak, Sushree S; Hu, Qiang; He, Wen; Kumar, Sanjay; Bhattacharyya, R (Springer Nature, 2025-06)
    We study the magnetic reconnection during a flare by investigating flare ribbon dynamics using observations and data-constrained magnetohydrodynamics (MHD) simulation. In particular, we estimate the reconnection flux and ...
  • Large cold dust reservoir revealed in transitional SN Ib 2014C by James Webb Space Telescope mid-infrared spectroscopy 
    Tinyanont, S; Fox, O. D; Shahbandeh, M; Temim, Tea; Williams, Robert; Wangnok, Kittipong; Rest, Armin; Lau, Ryan M; Maeda, K; Jencson, Jacob E; Auchettl, Katie; Filippenko, A. V; Larison, Conor; Ashall, Chris; Brink, Thomas G; Davis, Kyle W; Dessart, Luc; Foley, Ryan J; Galbany, L; Grayling, Matthew; Johansson, J; Kasliwal, Mansi M; Lane, Zachary G; LeBaron, Natalie; Milisavljevic, D; Rho, Jeonghee; Sakon, I; Sarangi, Arkaprabha; Szalai, Tamas; Taggart, Kirsty; Van Dyk, S. D; Wang, Qinan; Yang, Yi; Zheng, W; Zsiros, Szanna (American Astronomical Society, 2025-06-01)
    Supernova (SN) 2014C is a rare transitional event that exploded as a hydrogen-poor, helium-rich Type Ib SN and subsequently interacted with a hydrogen-rich circumstellar medium (CSM) a few months postexplosion. This unique ...

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