IIA Institutional Repository: Recent submissions

  • 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, 2025-06)
    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 ...
  • Doppler shifted transient sodium detection by KECK/HIRES 
    Unni, Athira; Oza, Apurva V; Hoeijmakers, H. Jens; Seidel, Julia V; Sivarani, T; Schmidt, Carl A; Kesseli, Aurora Y; Kleer, Katherine de; Baker, Ashley D; Gebek, Andrea; Westram, Moritz Meyer zu; Fisher, Chloe; Sallum, Steph; Manjunath, B; Bello-Arufe, Aaron (Oxford University Press on behalf of Royal Astronomical Society, 2025-06)
    We carried out the first high-resolution transit observations of the exoplanet WASP-49 Ab with Keck/HIRES. Upon custom wavelength calibration we achieve a Doppler RV precision of < 60 ms−1 . This is an improvement in ...
  • Computations of eclipses from 14th-century manuscript Ekanathakarana 
    Shylaja, B. S; Shubha, B. S (Springer Nature, 2025-06)
    The procedures followed for computations of eclipses in the classical treatises are best understood with a practical demonstration of the technique. Here, we have studied manuscripts describing the computations. These are ...
  • New age observing facilities for Indian astronomy: 2020–2035 
    Ramya, S; Roy, Jayanta; Reddy, Eswar; Anupama, G. C; Banyal, R. K; Bhalerao, Varun; Bhattacharyya, Subir; Buch, Kaushal Dipak; Eswaraiah, Chakali; Chitnis, V. R; Datta, Abhirup; Godambe, Sagar; Maheswar, G; Kale, Ruta; Lal, D. V; Mallick, K. K; Majumdar, P; Mitra, Sanjit; Oberoi, Divya; Mohanty, Pravata; Mookerjea, B; Ojha, D. K; Dewangan, Lokesh; Jose, J; Ninan, J. P; Rao, Mayuri Sathyanarayana; Pahari, Mayukh; Naik, Sachindra; Jain, Pankaj; Prabhu, T. P; Ramaprakash, A. N; Rana, Vikram; Ramesh, R; Ravindra, B; Sankarasubramanian, K; Ramadevi, M. C; Narendranath, S; Archana Soam; Vadawale, S. V; Vadamattom, Veena; Girish, V; Yadav, K. K; Singh, Krishna Kumar; Mankuzhiyil, Nijil; Bharat Kumar, Y; Arun Babu, K. P (Springer Nature, 2025-06)
    In this article, we present the current state of observing facilities available for Indian astronomers in various wavelength bands existing in the country. We also mention a few state-of-the-art astronomical facilities ...
  • An observational perspective into the nature of short-plateau Type II supernovae 
    Teja, Rishabh Singh (Indian Institute of Astrophysics, 2024-10)
    Supernovae (SNe, singular SN), the endpoints of stellar evolution, have fascinated humans since time immemorial, with recorded evidence dating back to two millennia. Continuing this quest, modern astronomy and astrophysics ...
  • Tracing the origin of heavy elements through metal-poor stars 
    Saraf, Pallavi (Indian Institute of Astrophysics, 2024-11)
    The hierarchical mass assembly of galaxies and the formation timescales of their substructures are important topics in astrophysics and cosmology. These aspects can be explored in the local universe by studying resolved ...
  • Confronting realistic MHD simulations of solar eruptions with observed space based data 
    Maity, Samriddhi Sankar (Indian Institute of Astrophysics, 2024-07)
  • Development of alignment and phasing system for India’s large segmented mirror telescope 
    Radhika, Dharmadhikari (Indian Institute of Astrophysics, 2024)
    The segmented mirror technology has become the preferred choice for building moderate to large-size optical telescopes. For the segmented primary mirror to function like a single monolithic mirror, each segment must be ...
  • Time domain astronomy at low radio frequencies (< 100 MHz): Instrumentation and observations 
    Bane Kshitij, Suhas Trupti (Indian Institute of Astrophysics, 2024)
    Exploration of the transient Universe is an exciting and fast-emerging area within radio astronomy. Radio transient sources can be defined as a class of objects that emit radio waves in the form of bursts, flares, or pulses ...
  • Diagnostic techniques and instrument concepts for probing transition region and coronal magnetic fields 
    Khan, Raveena (Indian Institute of Astrophysics, 2024)
    Magnetic fields are the primary driver of the plasma thermodynamics in the upper solar atmosphere, especially in the transition region (TR) and the corona. These magnetic fields hold the key to long standing questions in ...
  • Effect of AGN on the ISM of their hosts: A multi-wavelength perspective 
    Nandi, Payel (Indian Institute of Astrophysics, 2024-10)
  • Insights into the genesis and dynamics of the solar spicule forest: aided by simulations and laboratory experiments 
    Dey, Sahel (Indian Institute of Astrophysics, 2023-07)
  • The JCMT BISTRO-3 survey: Variation of magnetic field orientations on parsec and subparsec scales in the massive star-forming region G28.34+0.06 
    Hwang, Jihye; Pattle, Kate; Lee, Chang Won; Karoly, Janik; Kim, Kee-Tae; Kim, Jongsoo; Liu, Junhao; Qiu, Keping; Lyo, A-Ran; Eden, David; Koch, Patrick M; Arzoumanian, Doris; Sharma, Ekta; Poidevin, Frederick; Johnstone, Doug; Coude, Simon; Tahani, Mehrnoosh; Ward-Thompson, Derek; Archana Soam; Kang, Ji-hyun; Hoang, Thiem; Kwon, Woojin; Ngoc, Nguyen Bich; Chung, Eun Jung; Bourke, Tyler L; Onaka, Takashi; Kirchschlager, Florian; Tamura, Motohide; Kwon, Jungmi; Tang, Xindi; Eswaraiah, Chakali; Liu, Tie; Bastien, Pierre; Furuya, Ray S; Lai, Shih-Ping; Lin, Sheng-Jun; Wang, Jia-Wei; Berry, David (American Astronomical Society, 2025-06-01)
    Magnetic fields play a significant role in star-forming processes on core to clump scales. We investigate magnetic field orientations and strengths in the massive star-forming clump P2 within the filamentary infrared dark ...
  • Galaxies, clusters, and intergalactic medium: A vision document for the Indian Astronomical Community 
    Kale, Ruta; Muzahid, Sowgat; Khaire, V; Roy, Namrata; Das, Sanskriti; Chand, H; Chatterjee, Suchetana; Datta, Abhirup; Mousumi Das; Hota, A; Jog, C. J; Kartha, Sreeja S; Lal, D. V; Mondal, Chayan; Nath, B. B; Choudhury, Prakriti Pal; Paul, Surajit; Sachdeva, Sonali; Sharma, Prateek; Singh, Priyanka; Singh, V; Subramanian, S; Sur, Sharanya (Springer Nature, 2025-12)
    Galaxies, clusters, and the intergalactic medium (IGM) are the essential and interconnected components of the cosmic ecosystem. Galaxies, with their diverse morphologies and stellar populations, are the building blocks of ...
  • Coupling of Alfven and magnetosonic waves in rotating hall magnetoplasmas 
    Misra, Amar P; Dey, Rupak; Krishan, V (American Institute of Physics, 2025-06)
    We study the linear theory of magnetohydrodynamic (MHD) waves, namely, the Alfvén and the fast and slow magnetosonic modes in a rotating Hall-MHD plasma with the effects of the obliqueness of the external magnetic field ...

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