IIA Institutional Repository: Recent submissions

  • Ringdown and tide: fingerprints of dark matter halo profiles 
    Bhowmik, Arkadip; Chowdhury, Avijit; Chakrabarti, Sayan (American Physical Society, 2026-10-15)
    Astrophysical black holes (BHs) are not isolated, but embedded in matter supplied by their host galaxies. We study how the shape of a surrounding dark matter halo modifies the ringdown and tidal response of an asymptotically ...
  • Hawking-page phase transition for pure lovelock black holes 
    Dubey, Nitesh K; Kolekar, Sanved (American Physical Society, 2026-10-15)
    We investigate the thermodynamic properties of static, spherically symmetric anti--de Sitter (AdS) black holes, focusing on the interplay between characteristic temperatures, as well as on the universality of Ruppeiner ...
  • Nonzero phase shift of evanescent acoustic waves in the lower solar atmosphere 
    Kumar, Hirdesh; Rajaguru, S. P; Brajesh Kumar (EDP Sciences, 2026-10)
    Context. The phase behavior of acoustic waves in the lower solar atmosphere provides important information about wave propagation. While previous studies have reported nonzero phase shifts in the evanescent frequency range ...
  • Coordinated coronagraphic observations from proba-3 and Aditya-L1: Investigating coronal mass ejection energetics in the inner corona 
    Agarwal, Anjali; Mishra, Wageesh; Ramesh, R; Priyal, M; Zhukov, Andrei N; Singh, J; Gopalswamy, N; Khuntia, Soumyaranjan; Sasikumar Raja, K; Bourgoignie, B; Dolla, L; Shestov, S; Fineschi, S; Gunar, S; Lamy, P; Mierla, M; Peter, H; Rudawy, P; Tsinganos, K (EDP Sciences, 2026-10)
    Context. Constraining the plasma properties and energetics of coronal mass ejections (CMEs) in the inner corona is essential for understanding their early evolution, yet it remains challenging because of limited observations. ...
  • Wild behaviour near the finish line: The type Ibn SN 2020able and its stratified environment 
    Tartaglia, L; Cappellaro, E; Valerin, G; Pastorello, A; Benetti, S; Reguitti, A; Tomasella, L; Lundqvist, P; Misra, K; Gangopadhyay, A; Dastidar, R; Ailawadhi, Bhavya; Dimple; Brajesh Kumar; Jha, Vivek Kumar; Singh, Mridweeka; Elias-Rosa, N; Gutierrez, Claudia P; Howell, D. A; Hiramatsu, Daichi; Pellegrino, Craig; Andrews, Jennifer E; Sand, D. J; Smith, Nathan; Pearson, Jeniveve; Wyatt, S; Ochner, P; Cai, Y. Z; Burke, J; McCully, Curtis; Newsome, Megan; Padilla Gonzalez, E (EDP Sciences, 2026-11)
    We present spectrophotometric observations of the Type Ibn supernova SN 2020able, along with a comprehensive analysis and modelling of its evolution. The transient occurred in SDSS J092602.93+243115.1, a faint host galaxy ...
  • 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 ...

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