IIA Institutional Repository: Recent submissions

  • Exploring an X1.8 flare and associated quasi-periodic pulsations using SDO and Aditya-L1 observations, alongside NFFF extrapolation 
    Kumar, Pawan; Kumar, Sanjay; Sadashiv; Kanaujiya, Sachin Rajkapoor; Maurya, Yogesh Kumar (Springer Nature, 2026-10)
    The paper seeks to explore the initiation of an X1.8 class solar flare (SOL2024-10-09T0125) and the related quasi-periodic pulsations (QPPs), which are situated within NOAA active region 13848. To achieve this, we perform ...
  • Transients and stellar activity as revealed by ultraviolet diagnostic tracers 
    de Grijs, R; Barstow, Martin A; Chahal, Deepak; Favata, Fabio; Fu, Xiaoting; Gomez De Castro, Ana; Hota, Sipra; Sutaria, F. K (Springer Nature, 2026-12)
    Ultraviolet (UV) observations offer unique insights into transient and variable astrophysical phenomena, from the Sun and nearby stars to supernovae and star-forming galaxies. Here, we summarise and review the diagnostic ...
  • ROCKETS I: Investigating the impact of the rocket effect on two nearby young open clusters encased in infrared bubbles 
    Arun, R; Maheswar, G; Subramaniam, A; Saha, Piyali; Sudheesh, T. P; Shridharan, B; Mathew, B; Akhil, Krishna R (Cambridge University Press on behalf of Astronomical Society of Australia, 2026-10)
    We introduce ROCKETS (Rocket-driven Cluster Kinematics & Triggered Star-formation), a Gaia-based programme investigating kinematic fingerprints of stellar feedback or rocket effect in young star-forming regions. We analyse ...
  • SDSS-V BHM: Evidence for a link between X-ray weakness and galaxy-scale ionised gas outflows in quasars 
    Demke, Delvin; Wylezalek, D; Wik, Daniel R; Vivek, M; Rankine, Amy L; Brandt, W. N; Schneider, D. P; Assef, Roberto J; Aydar, Catarina; Anderson, S. F (EDP Sciences, 2026-10)
    Active galactic nuclei (AGNs) are among the most powerful engines in the Universe. A central open question is how accretion physics, obscuration, and feedback are intertwined in shaping these systems. This paper presents ...
  • 1.5D investigation of the Hanle effect in the Ca I 4227 line using partial frequency redistribution: Comparison of synthetic Stokes profiles in Bifrost and MURaM-ChE rMHD models 
    Agnihotri, Devang; Anusha, L. S; Przybylski, D; Cameron, R. H; Solanki, S. K (EDP Sciences, 2026-10)
    Context. Modeling scattering polarization in the Ca I 4227 Å line is important for diagnosing chromospheric magnetic fields. This requires solving the polarized radiative transfer equation, including the Hanle effect and ...
  • SN 2023gfo: A peculiar type IIP supernova with high luminosity and normal plateau duration 
    Namba, Riko; Yamanaka, Masayuki; Maeda, K; Singh, A; Taguchi, Kenta; Nagayama, Takahiro; Kawabata, Miho; Kawabata, K. S; Nakaoka, Tatsuya; Sahu, D. K; Gangopadhyay, A; Anupama, G. C (American Astronomical Society, 2026-10-01)
    We present near-infrared (NIR) and optical observations of the highly reddened Type IIP supernova (SN) 2023gfo in the nearby galaxy NGC 4995 (d = 26.4 ± 3.2 Mpc), which reached a high peak luminosity of MV = -18.6 mag. The ...
  • Grain alignment and dust evolution physics with polarisation (GRADE-POL): II. On the physical basis of Serkowski and super-Serkowski polarisation spectra 
    Le, Ngoc Tram; Hoang, Thiem; Andersson, B-G; Lazarian, Alex; Fanciullo, Lapo; Truong, Bao; Archana Soam (EDP Sciences, 2026-10)
    Optical-to-near-infrared interstellar polarisation, induced by aligned dust grains, generally follows a convex wavelength dependence, known as the Serkowski relation. However, observations in the ultraviolet (UV) and at ...
  • JWST nebular spectroscopy of SN 2023qov: Circumstellar dust emission in a normal type Ia supernova 
    Macrie, Colin W; Larison, Conor; Sears, Huei; Kwok, Lindsey A; Jha, Saurabh W; Dai, Mi; Johansson, J; Blondin, Stephane; Andrews, Moira; Auchettl, Katie; Badenes, Carles; Barna, Barnabas; Bostroem, K. Azalee; Brink, Thomas G; Davis, Kyle W; Farah, Joseph R; Filippenko, A. V; Fox, O. D; Graur, Or; Hall, Saarah; Howell, D. A; Hosseinzadeh, G; Jerkstrand, Anders; Konyves-Toth, Reka; Lidman, C; Maeda, K; Maguire, Kate; Martin, Bailey; Miller, Adam A; Newsome, Megan; Padilla, Gonzalez, E; Polin, Abigail; Rest, Armin; Rosenberg, Zoe A; Sand, D. J; Schwab, Michaela; Siebert, Matthew R; Singh, Mridweeka; Szalai, Tamas; Temim, Tea; Terwel, Jacco H; Tucker, Brad E; Vinko, J; Wang, Lingzhi; Wang, Xiaofeng; Zheng, W (American Astronomical Society, 2026-10-01)
    We present panchromatic observations of the Type Ia supernova (SN Ia) 2023qov, ranging from ~2 weeks before to ~1 yr after maximum light. JWST near- and mid-infrared spectra at +276 and +363 days show ~400 K dust emission ...
  • UV studies of star formation in different extragalactic environments 
    Amrutha, S (Indian Institute of Astrophysics, 2026-01)
    Star formation is crucial for galaxy evolution and can be driven by both internal processes and external interactions with neighboring galaxies. By studying the properties of star formation, we can infer the potential ...
  • Cosmological signature of primordial black hole (PBH) dark matter and its form in early universe 
    Chakraborty, Amlan (Indian Institute of Astrophysics, 2026-02)
    The nature of the dark sector remains one of the central open problems in modern cosmology. While the standard ΛCDM model provides an excellent description of a wide range of observations, recent high-precision data ...
  • Long-term evolution of chromospheric plage areas from Kodaikanal observatory Ca II K images and their relation to solar activity indices 
    Chowdhury, Partha; Singh, J; Priyal, M; Ravindra, B (Springer Nature, 2026-10)
    This study investigates the correlation and phase relationships between chromospheric Ca II K plage areas and key solar activity indices—including sunspot number, sunspot area, and 10.7 cm radio flux—across Solar Cycles ...
  • Investigating the young stellar populations and hierarchies in nearby galaxies with the UVIT. II. presenting the properties of ~25,000 UV-detected star-forming clumps 
    Shashank, Gairola; Subramanian, S; Mondal, Chayan; Menon, Shyam H; Subramaniam, A (American Astronomical Society, 2026-09)
    Studying young stellar populations within galaxies can help refine our understanding of recent star formation in galaxies and their evolution. With this motivation, we present a catalog of ~25,000 recently formed (within ...
  • CHIME/slow overview and pilot survey: A new backend to search for second-duration radio transients with the CHIME telescope 
    Mate, Sujay; Luke, Kevin; Bhusare, Yash; Balasubramanian, Arvind; Pleunis, Ziggy; Scholz, Paul; Tendulkar, Shriharsh; Bhardwaj, Mohit; Brar, Charanjot; Dong, Fengqiu Adam; Fonseca, Emmanuel; Gaensler, B. M; Hessels, Jason; Huang, Jeff; Jain, Naman; Joseph, Ronniy C; Kaspi, Victoria M; Khan, Afrokk; Main, Robert; Meyers, Bradley W; Milutinovic, Nikola; Nimmo, Kenzie; Shin, Kaitlyn; Spear, David; Stairs, Ingrid; Tan, Chia Min (American Astronomical Society, 2026-09-01)
    We present an overview of CHIME/Slow, a real-time transient search backend under development to search for second-duration radio transients using the CHIME telescope, and results obtained from a pilot survey carried out ...
  • The ALMA-QUARKS survey: Properties of hot molecular fragments in the massive protocluster IRAS 17233-3606 
    Chen, Li; Qin, Sheng-Li; Yang, Dongting; Jiao, Wenyu; Liu, Tie; Goldsmith, Paul F; Zhang, Zhenying; Li, Chuanshou; Xu, Feng-Wei; Dib, S; Gupta, Shivani; Tang, Xindi; Peng, Yaping; Tang, Mengyao; Juvela, Mika; Li, Di; Yang, A.Y; Liu, Meizhu; Zhen, Lingmin; Chibueze, J. O; Toth, L. Viktor; Hoque, Ariful; Stutz, Amelia M; Bronfman, Leonardo; Das, Swagat; Garcia, Pablo; Kim, Kee-Tae; Lee, Chang Won; Hwang, Jihye; Zou, Jia-Hang; Guo, Yongqi; Kou, Zhiping (American Astronomical Society, 2026-09-10)
    To investigate the physical mechanisms of fragmentation within the hot molecular core of the massive protocluster IRAS 17233-3606 (G351.78-0.54), we carried out a detailed analysis of continuum and lines using the Atacama ...
  • Multiband optical photometric variability of the blazar OJ 287 from 2015 to 2025 
    Gupta, A. C; Dogra, Karan; Kidger, M; Valtonen, Mauri J; Wiita, P. J; Kushwaha, Pankaj; Savchenko, S. S; Kurtanidze, S. O; Jorstad, S; Marscher, A; Matsumoto, K; Poyner, G; Rahmatullaeva, F; Rajkumar, N; Ribes, N. G; Semkov, E; Shishkina, E. V; Stojanovic, M; Strigachev, A; Tripathi, Tushar; Troitskaya, Y. V; Troitskiy, I. S; Valero, J; Vasilyev, A. A; Villarroel, B; Volvach, A. E; Volvach, L. N; Wagner, S. J; Weaver, Z. R; Yang, Wen Xin; Zhang, Zhongli; Zhovtan, A. V; Zuo, Wenwen; Kojiguchi, N; Sugiura, Y; Cui, Lang; Hu, Shao Ming; Damljanovic, G; Bachev, R; Vince, O; Liao, M; Wang, Zhongxiang; Darriba, A; Haque, S; Alfaro, F. S; Amatller, J. B; Andujar, J. M. F; Arnold, S; Arranz, T; Bachini, M; Barcelo, C. L; Boeva, S; Borman, G. A; Boyd, D; Buczinski, D; Casal, J. D; Chen, X; Cores, J. M; Cucarella, F. C; Devanand, P. U; Dhiman, V; Espasa, L. T; Fan, J. H; Farfan, R. G; Fernandez, J. R; Garcia, F; Garcia, R. C; Gaur, H; Gomez, J. C; Gonzalez, J. L. S; Gonzalez-Carballo, J. L; Grishina, T. S; Grondona, F. H; Gu, M. F; Guo, H; Hagen-Thorn, V. A; Hurst, G; Ibryamov, S. I; Ivanidze, R. Z; James, N; Jardine, B; Johnstone, S; Jovanovic, M. D; Kalita, N; Karge, S; Kishore, Shubham; Kopatskaya, E. N; Kurtanidze, O. M; Kurtenkov, A; Larionova, Elena G; Lorenz, E. R; Lozano, J; Mananes, E. F; Martinez, F. L; Mobberley, M; Morales-Aimar, M; Morozova, D. A; Nikolashvili, M. G; Nikolov, Y; Nogues, R. Naves; Novikova, P. A; Penas, L. M; Perez, A. Escartin; Perello, C; Pickard, R; Pinilla, F. G (American Astronomical Society, 2026-09)
    We present the most densely sampled multiband optical photometric observations of the peculiar BL Lacertae object OJ 287 from 2015 to 2025 with a focus on its optical activity on diverse timescales. We present a total of ...
  • Reflectivity degradation study of 0.7-m Growth India Telescope (GIT), Hanle 
    Remya, B.S. (Indian Institute of Astrophysics, 2026-10-14)
    The reflectivity of the optical components of the 0.7-m GROWTH India Telescope (GIT) at the Indian Astronomical Observatory (IAO), Hanle, was measured using a CT7 reflectometer at seven discrete wavelengths ranging from ...
  • Reflectivity degradation study of 2m Himalayan Chandra Telescope mirror 
    Remya, B.S. (Indian Institute of Astrophysics, 2026-10-14)
    The reflectivity degradation study of the optical components of the 2-m Himalayan Chandra Telescope (HCT) at the Indian Astronomical Observatory (IAO), Hanle, was carried out using a CT7 reflectometer. The measurements ...
  • Reflectivity degradation study of mirror coupons at NLST site Merak 
    Remya, B.S. (Indian Institute of Astrophysics, 2026-10-14)
    The reflectivity degradation study of mirror coatings at the proposed National Large Solar Telescope (NLST) site at Merak, Ladakh, was initiated to assess the performance of different optical coating configurations under ...
  • Application of coherent structure tracking to solar Doppler maps to determine horizontal velocity fields at the sun's surface 
    Sampoorna, M; Roudier, T; Paletou, F (EDP Sciences, 2026-09)
    Context. Coherent structure tracking (CST) is a technique for determining solar surface horizontal flows at high spatial and temporal resolution by tracking the proper motion of granules. This technique has traditionally ...
  • Discovery of an unbound flyby companion of UBC 63: In the immediate aftermath of a close encounter 
    Biswas, Samrat; Medhi, B. J; Messina, S; Zhu, Zhanpeng; Qin, Songmei; Deb, Sukanta; Sheikh, A. H; Das, H. S; Tamura, Motohide; Maheswar, G; Sagar, R (American Astronomical Society, 2026-09)
    We reinvestigate the open cluster UBC 63 using the Gaia Data Release 3 and show that, rather than being a single cluster as previously classified, it is a compelling candidate for a double cluster undergoing an unbound ...

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