IIA Institutional Repository: Recent submissions

  • Thermal sensitivity analysis of 2D profilometer used for TMT polished glass polishing 
    Panchal, Pramod; Jha, Sanjeev K; Basheer, Alikhan; Valsan, Vineeth; Prasanna Deshmukh; Sriram, S (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-08)
    TMT adopts Stressed Mirror Polishing (SMP) technology for the polishing of mirror segments. In this process, the meniscus type spherical shape glass blanks are converted in to a desired aspheric shape by spherical grinding ...
  • Slitless spectroscopy simulations of Milky Way dwarf satellite galaxies using TMT-WFOS 
    Divakar, Devika; Sivarani, T; Sethuram, Ramya; Fucik, Jason; Steidel, Chuck; Manjunath, B; Prasanna Deshmukh (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-08)
    Wide Field Optical Spectrograph (WFOS) is the first light instrument of Thirty Meter Telescope (TMT), which will be one of the wide field spectrographs for optical spectroscopy and can probe the faintest limits. In order ...
  • Indian Institute of Astrophysics Annual Report: 2023-24 
    Subramaniam, A (Indian Institute of Astrophysics, 2024)
  • Indian Institute of Astrophysics Annual Report: 2022-23 
    Subramaniam, A (Indian Institute of Astrophysics, 2023)
  • Unraveling the kinematic and morphological evolution of the small magellanic cloud 
    Dhanush, S. R; Subramaniam, A; Subramanian, S (American Astronomical Society, 2025-02-10)
    We model the kinematics of the Small Magellanic Cloud (SMC) by analyzing the proper motions (PMs) from Gaia DR3 of nine different stellar populations, including young main-sequence (MS) stars (<2 Gyr), red giant branch ...
  • DA 362: a gamma-ray-emitting compact symmetric object 
    Swain, Subhashree; Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S (American Astronomical Society, 2025-02-01)
    The γ-ray detection from an astrophysical object indicates the presence of an extreme environment where highenergy radiation is produced. With the continuous monitoring of the γ-ray sky by the Fermi Large Area Telescope ...
  • Magnetic topology of quiet-Sun Ellerman bombs and associated ultraviolet brightenings 
    Bhatnagar, Aditi; Avijeet Prasad; Rouppe van der Voort, L; Nobrega-Siverio, Daniel; Joshi, Jayant (EDP Sciences, 2025-01)
    Context. Quiet-Sun Ellerman bombs (QSEBs) are small-scale magnetic reconnection events in the lower atmosphere of the quiet Sun. Recent work has shown that a small percentage of them can occur co-spatially and co-temporally ...
  • Detection of enhanced germanium in a new cool extreme helium star A980: insights and implications 
    Saini, Ajay Kumar; Pandey, G (American Astronomical Society, 2025-02-01)
    A fine abundance analysis of a recently discovered hydrogen-deficient carbon (HdC) star, A980, is presented. Based on the observed high-resolution optical spectrum, we ascertain that A980 is a cool extreme helium (EHe) ...
  • Excess ultraviolet emission at high galactic latitudes: a new horizons view 
    Murthy, Jayant; Shull, J. Michael; Postman, Marc; Parker, Joel Wm; Redfield, Seth; Cunningham, Nathaniel; Gladstone, G. Randall; Pineau, Jon P; Brandt, Pontus; Verbiscer, Anne J.; Singer, Kelsi N; Weaver, H. A; Henry, R. C; Stern, S. Alan (American Astronomical Society, 2025-02)
    We present new observations of the cosmic ultraviolet background (CUVB) at high Galactic latitudes (|b| > 40o ), made using the Alice UV spectrograph on board the New Horizons spacecraft. These observations were taken at ...
  • Sensitivity analysis of aerosol optical and radiative properties over the climate sensitive Hindu Kush Himalayan region using sky radiometer observation 
    Ningombam, Shantikumar S; Mukhopadhyay, Swagata; Madhavan, B. L; Srivastava, A. K (Elsevier B.V, 2025-03-01)
    The study examined sensitivity analysis of aerosol optical and radiative properties due to different versions of SKYRAD.pack module (i.e. versions 4.2 and 5.0) along with stability and performance of sky radiometer instruments ...
  • Serendipitous detection of an intense X-ray flare in the weak-line T Tauri star KM Ori with SRG/eROSITA 
    Ezhikode, Savithri H; Anilkumar, Hema; Arun, R; Mathew, Blesson; Jithesh, V; Bhattacharyya, Suman; Nedhath, Sneha; Cysil, T. B; Muneer, S; Kartha, Sreeja S; Kumar, S. P (Cambridge University Press on behalf of Astronomical Society of Australia, 2025-01)
    Weak-line T Tauri stars (WTTS) exhibit X-ray flares, likely resulting from magnetic reconnection that heats the stellar plasma to very high temperatures. These flares are difficult to identify through targeted observations. ...
  • Study of wind pattern at the incursion site of Pangong Tso near merak village 
    Ravindra, B; Sarkar, Deepangkar; Shantikumar, N. S; Tundup, Stanzin; Dorje, N; Angchuk, D; Kesavan, Prabhu; Banerjee, D (Springer Nature, 2025-02)
    This study analyzes twelve years of wind speed and direction data collected at the proposed National Large Solar Telescope (NLST) site near Pangong Tso, Merak village, Leh-Ladakh. A weather station from Campbell Scientifc ...
  • SN 2023tsz: a helium-interaction-driven supernova in a very low-mass galaxy 
    Warwick, B; Lyman, J; Pursiainen, M; Coppejans, D. L; Galbany, L; Jones, G. T; Killestein, T. L; Kumar, A; Oates, S. R; Ackley, K; Anderson, Joseph P; Aryan, A; Breton, R. P; Chen, T. W; Clark, P; Dhillon, V. S; Dyer, Martin J; Gal-Yam, A; Galloway, D. K; Gutierrez, Claudia P; Gromadzki, Mariusz; Inserra, Cosimo; Jimenez-Ibarra, F; Kelsey, L; Kotak, R; Kravtsov, T; Kuncarayakti, H; Magee, M. R; Matilainen, K; Mattila, S; Muller-Bravo, T. E; Nicholl, M; Noysena, K; O'Brien, P; O'Neill, D; Palle, E; Pessi, T; Petrushevska, T; Pignata, G; Pollacco, D; Ragosta, Fabio; Ramsay, G; Sahu, A; Sahu, D. K; Singh, A; Sollerman, Jesper; Stanway, E; Starling, R; Steeghs, D; Teja, Rishabh Singh; Ulaczyk, K (Oxford University Press on behalf of Royal Astronomical Society, 2025-02)
    SN 2023tsz is a Type Ibn supernova (SN Ibn), an uncommon subtype of stripped-envelope core-collapse supernovae (SNe), discovered in an extremely low-mass host. SNe Ibn are characterized by narrow helium emission lines in ...
  • Tracing hierarchical star formation out to kiloparsec scales in nearby spiral galaxies with UVIT 
    Shashank, Gairola; Subramanian, S; Muraleedharan, Sreedevi; Menon, Shyam H; Mondal, Chayan; Krishna, Sriram; Mousumi Das; Subramaniam, A (EDP Sciences, 2025-01)
    Molecular clouds fragment under the action of supersonic turbulence and gravity, which results in a scale-free hierarchical distribution of star formation within galaxies. Recent studies suggest that the hierarchical ...
  • A compilation of optical starlight polarization catalogs 
    Panopoulou, G. V; Markopoulioti, L; Bouzelou, F; Millar-Blanchaer, M. A; Tinyanont, S; Blinov, D; Pelgrims, V; Johnson, S; Skalidis, R; Archana Soam (American Astronomical Society, 2025-01)
    Polarimetry of stars at optical and near-infrared wavelengths is an invaluable tool for tracing interstellar dust and magnetic fields. Recent studies have demonstrated the power of combining stellar polarimetry with distances ...
  • Bar formation and destruction in the FIRE-2 simulations 
    Ansar, Sioree; Pearson, Sarah; Sanderson, Robyn E; Arora, Arpit; Hopkins, Philip F; Wetzel, Andrew; Cunningham, Emily C; Quinn, Jamie (American Astronomical Society, 2025-01-01)
    The physical mechanisms responsible for bar formation and destruction in galaxies remain a subject of debate. While we have gained valuable insight into how bars form and evolve from isolated idealized simulations, in the ...
  • Gravitational physics in the context of Indian astronomy: A vision document 
    Ajith, P; Arun, K. G; Bose, Sukanta; Chakraborty, Sumanta; Desai, Shantanu; Gopakumar, A; Kolekar, Sanved; Nayak, Rajesh; Pai, Archana; Sarkar, Sudipta; Bagla, Jasjeet Singh; Gupta, Patrick Das; Kashyap, Rahul; Kocherlakota, Prashant; Kumar, Prayush; Mukhopadhyay, Banibrata (Springer Nature, 2025-06)
    Contributions from the Indian gravity community have played a significant role in shaping several branches of astronomy and astrophysics. This document reviews some of the most important contributions and presents a vision ...
  • Automated detection of galactic rings from sloan digital sky survey images 
    Abraham, Linn; Abraham, Sheelu; Kembhavi, A. K; Philip, N. S; Aniyan, A. K; Barway, Sudhanshu; Kumar, Harish (American Astronomical Society, 2025-01-10)
    Morphological features in galaxies—like spiral arms, bars, rings, and tidal tails, etc.—carry information about their structure, origin, and evolution. It is therefore important to catalog and study such features and to ...
  • Research on the interstellar medium and star formation in the Galaxy: An Indian perspective 
    Mookerjea, B; Maheswar, G; Acharyya, K; Baug, Tapas; Datta, Prasun; Jose, J; Ojha, D. K; Pandian, Jagadheep D; Roy, Nirupam; Samal, Manash; Sharma, Saurabh; Archana Soam; Vig, S; Das, Ankan; Dewangan, Lokesh; Dutta, Somnath; Eswariah, C; Majumdar, Liton; Mallick, K. K; Mondal, Soumen; Ninan, Joe P; Panwar, Neelam; Pathak, A; Rastogi, Shantanu; Sahu, Dipen; Tej, Anandmayee (Springer Nature, 2025-06)
    Although the star-formation process has been studied for decades, many important aspects of the physics involved remain unsolved. Recent advancements in instrumentation in the infrared, far-infrared, and sub-millimeter-wavelength ...
  • X-ray timing and spectral characteristics of compact symmetric objects 
    Swain, Subhashree; Stalin, C. S; Paliya, Vaidehi S; Saikia, D. J (Oxford University Press on behalf of Royal Astronomical Society, 2025-02)
    Compact Symmetric Objects (CSOs) are a distinct category of jetted active galactic nuclei whose high-energy emission is not well understood. We examined the X-ray characteristics of 17 bona fide CSOs using observations ...

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