IIA Institutional Repository: Recent submissions

  • 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 ...
  • Deciphering the details of recent interactions in the magellanic clouds 
    Hota, Sipra (Indian Institute of Astrophysics, 2025-09)
    The Small Magellanic Cloud (SMC), a dwarf galaxy in the local neighborhood, offers an accessible laboratory for exploring star formation processes in a metal-poor environment.The SMC’s structure, stellar populations, and ...
  • The role of three William Herschel telescopes in colonial India 
    Kapoor, R. C (National Astronomical Research Institute of Thailand, 2025-09)
    In this paper we provide information on some of the telescopes to which one of the most prominent names in the history of astronomy is attached: Frederick William Herschel. He built telescopes of different apertures and ...
  • Chasing Mercury: Transit tales from India 
    Kapoor, R. C (National Astronomical Research Institute of Thailand, 2025-09)
    Planets passing across the disk of the Sun are among the most uncommon and fascinating phenomena in the Solar System. From the Earth, the transits of only Mercury and Venus can be seen. Early on, the transits of Venus were ...
  • Near ultraviolet transient explorer (nutex): a cubesat-based nuv imaging payload for transient sky surveys 
    Shubham Jankiram, Ghatul; Mohan, Rekhesh; Murthy, J; Safonova, M; Kumar, P; Gopinathan, Maheswar; Jain, Shubhangi; Mahesh Babu, S (Frontiers, 2025-12)
    The Near Ultraviolet Transient Explorer (NUTEx) is a CubeSat-based nearultraviolet (NUV) imaging payload designed for transient sky surveys and is currently under development. CubeSats are compact and cost-effective satellite ...
  • FIELDMAPS data release: Far-infrared polarization in the "bones" of the milky way 
    Coude, Simon; Stephens, Ian W; Myers, Philip C; Karnath, Nicole; Smith, Howard A; Guzman, Andres E; Marin, Jessy; Zucker, Catherine; Andersson, B-G; Li, Zhi-Yun; Looney, Leslie W; Novak, Giles; Pillai, Thushara G.S; Sadavoy, Sarah; Sanhueza, Patricio; Archana Soam (American Astronomical Society, 2026-01)
    Polarization observations of the Milky Way and many other spiral galaxies have found a close correspondence between the orientation of spiral arms and magnetic field lines on scales of hundreds of parsecs. This paper ...
  • The life and science of Thanu Padmanabhan (1957-2021) 
    Bagla, Jasjeet Singh; Bhattacharya, K; Chakraborty, Sumanta; Engineer, S; Faraoni, V; Kolekar, Sanved; Kothawala, D; Lochan, K; Modak, S; Nair, Parameswaran V; Paranjape, A; Parattu, K; Rajeev, S. G; Majhi, B. R; Choudhury, T. R; Sami, M; Sarkar, Sudipta; Sengupta, S; Seshadri, T. R; Shankaranarayanan, S; Singh, Surya Prakash; Singh, T. P; Sriramkumar, L; Yajnik, U. A (Springer Nature, 2026-01)
    Thanu Padmanabhan was a renowned Indian theoretical physicist known for his research in general relativity, cosmology, and quantum gravity. In an extraordinary career spanning forty-two years, he published more than three ...
  • Clues on the X-ray emission mechanism of blazars PKS 2155−304 and 3C 454.3 through polarization studies 
    Bharathan, Athira M; Stalin, C. S; Sahayanathan, S; Mathew, B (Elsevier B.V, 2026-02)
    X-ray polarization measurable with the imaging X-ray Polarimetry Explorer (IXPE) could constrain the long debated leptonic versus hadronic origin for the high energy component in the broad band spectral energy distribution ...
  • Modelling the scattering by porous aggregate dust grains in the far-ultraviolet halos of spica and achernar 
    Choudhury, Nilanjana Dey; Shalima, P; Keerthana, U; Murthy, J (Elsevier B.V, 2026-02)
    Far-Ultraviolet (FUV) halos have been detected around six bright stars by Murthy and Henry (2011) using GALEX observations. These halos are thought to be caused by forward scattering of the starlight by dust grains present ...
  • Magnetic fields in the close neighbourhood of LDN 328 core 
    Gupta, Shivani; Archana Soam; Karoly, Janik; Lee, Chang Won (Oxford University Press on behalf of Royal Astronomical Society, 2026-02)
    Linearly polarized dust emission traces the plane-of-sky magnetic field structure, thus allowing us to investigate the role of magnetic fields in the formation and evolution of cloud cores. In this work, we present ...
  • First discovery of a fast-rotating blue straggler in a compact binary with a sub-stellar companion 
    Sheikh, A. H; Medhi, B. J; Messina, S; Subramaniam, A; Panwar, Neelam; Sagar, R (Oxford University Press on behalf of Royal Astronomical Society, 2026-02)
    We report the first discovery of a brown-dwarf (BD) companion using a radial velocity-based study of a rapidly rotating blue straggler star (BSS) in a short-period close binary system in NGC 2243. Multi-epoch spectra from ...
  • Thermal properties of interplanetary coronal mass ejections at 1 au and their connection to geoeffectiveness across solar cycles 23─25 
    Khuntia, Soumyaranjan; Mishra, Wageesh (Oxford University Press on behalf of Royal Astronomical Society, 2026-02)
    Interplanetary coronal mass ejections (ICMEs) are major drivers of heliospheric variability and can produce prolonged disturbances near Earth. Understanding their thermodynamic evolution is crucial for assessing their heat ...
  • A study of two Type IIb supernovae: SNe 2008aq and 2019gaf 
    Singh, Mridweeka; Sahu, D. K; Dastidar, R; Teja, Rishabh Singh; Gangopadhyay, A; Anupama, G. C; Howell, D. A; Bostroem, K. Azalee; McCully, Curtis; Burke, Jamison; Joshi, Arti; Hiramatsu, Daichi; Im, Hyobin; Srivastav, S; Misra, K (Oxford University Press on behalf of Royal Astronomical Society, 2026-02)
    We present photometric and spectroscopic studies of two core-collapse supernovae (SNe) 2008aq and 2019gaf in the optical wav elengths. Light curv e and spectral sequence of both the SNe are similar to those of other Type ...
  • Optical observations of the fast nova V1674 herculis 
    Rawat, Neeraj Singh; Sonith, L. S; Kamath, U. S; Bhargava, Yash; Anupama, G. C; Singh, K. P (Oxford University Press on behalf of Royal Astronomical Society, 2026-04)
    We present the evolution of optical spectra and light curves of the fast nova V1674 Herculis during 150 d past its eruption. Using the post-eruption AAVSO light curv e, w e hav e calculat ed the orbital period of V1674 Her ...
  • Structure and magnetic field of the bright-rimmed cloud IC 1396E/SFO 38 
    Sugitani, Koji; Wouterloot, Jan G. A; Parsons, Harriet; Graves, Sarah; Kusune, Takayoshi; Archana Soam (Oxford University Press on behalf of the Astronomical Society of Japan, 2026-02)
    We carried out polarimetric observations of the bright-rimmed cloud IC 1396E/SFO 38 with SCUBA-2/POL-2 to study the effect of ultraviolet (UV) light on its structure and magnetic field. This bright-rimmed cloud appears ...

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