IIA Institutional Repository: Recent submissions

  • Quiet Sun Ellerman bombs as a possible proxy for reconnection-driven spicules 
    Sand, Mats Ola; van der Voort, Luc Rouppe; Joshi, Jayant; Bose, Souvik; Nobrega-Siverio, Daniel; Grinon-Marin, Ana Belen (EDP Sciences, 2025-05)
    Context. Spicules are elongated, jet-like structures that populate the solar chromosphere and are rooted in the lower solar atmosphere. In recent years, high-resolution observations and advanced numerical simulations have ...
  • Kinematic study of molecular gas in cometary globule – LBN 437 
    Aardra, S; Issac, Namitha; Archana Soam; Mathew, B; Lee, Chang Won (Oxford University Press on behalf of Royal Astronomical Society, 2025-07)
    Bright-rimmed, cometary-shaped star-forming globules, associated with H II regions, are remnants of compressed molecular shells exposed to ultraviolet radiation from central OB-type stars. The interplay between dense ...
  • Ultraviolet Background Radiation from Not-So-Dark Matter in the Galactic Halo 
    Henry, R. C; Murthy, J; Overduin, James (Multidisciplinary Digital Publishing Institute, 2025-05)
    Murthy et al. (2025) (hereafter Paper I) have recently reported the discovery of unexpectedly bright diffuse extreme-ultraviolet radiation at high latitudes in both the Northern and Southern Galactic Hemispheres. After ...
  • Global 21 cm signal: A promising probe of primordial features 
    Naik, Suvedha Suresh; Pravabati, C; Singh, Saurabh; Mesinger, Andrei; Furuuchi, Kazuyuki (IOP Publishing, 2025-05)
    Inflationary models that involve bursts of particle production generate bump-like features in the primordial power spectrum of density perturbations. These features influence the evolution of density fluctuations, leaving ...
  • Proton heating estimates from near-Earth observations of coronal mass ejections in solar cycle 24 
    Bhattacharjee, Debesh; Subramanian, P; Majumder, Saikat; Mishra, Wageesh (Oxford University Press on behalf of Royal Astronomical Society, 2025-07)
    As solar coronal mass ejections (CMEs) propagate through the heliosphere, they expend energy in heating protons to compensate for the cooling that occurs due to expansion. CME propagation models usually treat energy ...
  • Can Hubble tension be eased by invoking a finite range for gravity? 
    Rebecca, Louise; Sivaram, C; Sebastian, Dominic; Kenath, Arun (World Scientific Publishing, 2024-06)
    The estimation of the Hubble constant in the past few decades has increasingly become more accurate with the advancement of new techniques. However, its value seems to depend on the epoch at which the measurements are made. ...
  • High-resolution spectral analysis of three high-latitude carbon stars 
    Meenakshi, P; Dutta, Debasish; Goswami, A; Kartha, Sreeja S (Cambridge University Press on behalf of Astronomical Society of Australia, 2025-04)
    We present the results of a detailed high-resolution spectroscopic analysis (SUBARU/HDS spectra, R ∼50,000) of three faint high-latitude carbon stars HE 1104 − 0957, HE 1205 − 0521, and HE 1244 − 3036. Our estimated ...
  • Test and Calibration of the Solar Ultraviolet Imaging Telescope (SUIT) on Board Aditya-L1 
    Sarkar, Janmejoy; Nived, V. N; Roy, Soumya; Deogaonkar, Rushikesh; Padinhatteeri, Sreejith; Bayanna, A. R; Kesharwani, Ravi; Ramaprakash, A. N; Tripathi, Durgesh; Gopalakrishnan, Rahul; Joshi, Bhushan; Sinha, Sakya; Burse, Mahesh; Varma, Manoj; Tyagi, Anurag; Yadav, Reena; Rajarshi, Chaitanya; Adithya, H. N; Adoni, A. A; Ahmed, Gazi A; Banerjee, D; Bhandare, Rani; Bhargava Ram, B. S; Chillal, Kalpesh; Chordia, Pravin; Ghosh, Avyarthana; Gowda, Girish; Jain, Anand; James, Melvin K; Justin, Evangeline Leeja; Kathait, Deepak; Khan, Aafaque; Khodade, Pravin; Kohok, A; Kulkarni, Akshay; Kumar, Ghanshyam; Mehandiratta, Nidhi; Mestry, V. B; Modi, Deepa; Motamarri, Srikanth; Nagaraju, K; Nandy, D; Narendra, S; Navle, Sonal; Parate, Nashiket; Punnadi, Sujit; Ravi, A; Sankarasubramanian, K; Sarvar, Ghulam; Shaji, Nigar; Solanki, S. K; Rethika, T; Vadodariya, Kaushal; Veeresha, D. R; Venkateswaran, R (Springer Nature, 2025-05)
    The Solar Ultraviolet Imaging Telescope (SUIT) on board the Aditya-L1 mission observes the Sun in the 200 – 400 nm wavelength range. This paper presents the results of various on ground and on-board tests and their ...
  • Square Kilometre Array—India consortium: Education and public outreach 
    Ramanujam, N. M; Dutta, Prasun; Indulekha, K; Chakraborty, Manoneeta; Dhurde, Samir; Hota, A; Konar, Chiranjib; Oberoi, Divya; Pandey-Pommier, Mamta; Rao, Mayuri Sathyanarayana (Indian Academy of Sciences, 2024-06)
    This paper presents a report on the activities and the proposed action plan of the Education and Public Outreach Working Group (EPO WG) of Square Kilometre Array–India Consortium (SKAIC). Details of a set of flagship ...
  • Optical design studies for national large optical-IR telescope 
    Padikal, Varun; Hasan, Amirul; Valsan, Vineeth; Sriram, S; Kurian, Athul; Vishnu, Unni. C; Basheer, Alikhan; Panchal, Pramod; Maheswar, G; Remya, B. S; Chand, Totan (Indian Academy of Sciences, 2024-06)
    A 10–12 m class national large optical-IR telescope (NLOT) is envisaged to meet the growing scientific requirements in astronomy and astrophysics. Telescopes of such dimensions can only be made by segmenting the primary ...
  • Low-cost Raspberry Pi star sensor for small satellites. II: StarberrySense flight and in-orbit performance 
    Bharat Chandra, P; Binukumar, G; Jain, Shubhangi; Shubham Jankiram, Ghatul; Mahesh Babu, S; Mohan, Rekhesh; Safonova, M; Murthy, J (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-04)
    Star sensors are an essential instrument used to determine the attitude of satellites by identifying the stars in the field of view. The high cost and large sizes of commercially available star sensors pose challenges for ...
  • Is asteroid 33 Polyhymnia a dark matter (DM) degenerate object? 
    Kiren, O. V; Sivaram, C; Kenath, Arun (Springer Nature, 2024-06)
    Polyhymnia (33 Polyhymnia) is a main belt asteroid in our solar system with a diameter around 54 km. The density of asteroid 33 Polyhymnia, located in the main asteroid belt, is calculated to be 75 g/cc. Researchers have ...
  • Cross-correlation between the curvature perturbations and magnetic fields in pure ultraslow roll inflation 
    Tripathy, Sagarika; Chowdhury, Debika; Ragavendra, H. V; Sriramkumar, L (American Physical Society, 2025-03-15)
    Motivated by the aim of producing significant number of primordial black holes, over the past few years, there has been a considerable interest in examining models of inflation involving a single, canonical field, that ...
  • Wave analysis tools 
    Jafarzadeh, Shahin; Jess, David B.; Stangalini, Marco; Grant, Samuel D. T; Higham, Jonathan E; Pessah, Martin E; Keys, Peter H; Belov, Sergey; Calchetti, Daniele; Duckenfield, Timothy J; Fedun, Viktor; Fleck, Bernhard; Gafeira, Ricardo; Jefferies, Stuart M; Khomenko, Elena; Morton, Richard J; Norton, Aimee A; Rajaguru, S. P; Schiavo, Luiz A C. A; Sharma, Rahul; Silva, Suzana S. A; Solanki, Sami K; Steiner, Oskar; Verth, Gary; Vigeesh, G; Yadav, Nitin (Springer Nature, 2025-04)
    This Primer provides an overview of a fundamental set of analysis methods for studying waves, vibrations and related oscillatory phenomena — including instabilities, turbulence and shocks — across diverse scientific fields. ...
  • Investigating pulsating variables and eclipsing binaries in NGC 2126 using ground- and space-based photometry, astrometry, spectroscopy, and modelling 
    Dileep, Athul; Joshi, Santosh; Lata, S; Lampens, P; De Cat, P; Zuniga-Fernandez, Sebastian; Mkrtichian, David; Pramod Kumar, S; Sarkar, M; Panchal, Alaxender; Joshi, Y. C; Rishi, C; Panwar, Neelam; Jain, Arjav; Rathore, Neeraj (Oxford University Press on behalf of Royal Astronomical Society, 2025-04)
    Pulsating variables are prevalent in the classical δ Scuti instability strip of intermediate-age open star clusters. The cluster membership of these stars facilitates a comparative analysis of their evolution in analogous ...
  • A virgo environmental survey tracing ionised gas emission (VESTIGE): XVIII. Reconstructing the star formation history of early-type galaxies through the combination of their UV and Hα emission 
    Martocchia, S; Boselli, A; Maraston, C; Thomas, D; Boquien, M; Roehlly, Y; Fossati, Matteo; Seille, L. M; Amram, P; Boissier, S; Buat, V; Cote, Patrick; Cuillandre, J. C; Ferrarese, L; Gwyn, S; Hutchings, J; Junais; Morgan, C. R; Postma, J; Woods, T. E; Roediger, J; Subramaniam, A; Sun, M; Zhang, H. X (EDP Sciences, 2025-04)
    We reconstructed the star formation histories of seven massive (M⋆ ≳ 1010 M⊙) early-type galaxies (ETGs) in the Virgo cluster by analysing their spatially resolved stellar population (SP) properties including their ultraviolet ...
  • Investigating the role of bars in quenching star formation using spatially resolved ultraviolet-optical colour maps 
    Renu, D; Subramanian, S; Rao, Suhasini; George, Koshy (EDP Sciences, 2025-04)
    Context. Bars are ubiquitously found in disc galaxies and they are known to drive galaxy evolution through secular processes. However, the specific contribution of the bars in the suppression of star formation is still a ...
  • Ca II K polar network index of the sun: a proxy for historical polar magnetic field 
    Mishra, Dibya Kirti; Jha, Bibhuti K; Chatzistergos, Theodosios; Ermolli, Ilaria; Banerjee, D; Upton, Lisa A; Khan, M. Saleem (American Astronomical Society, 2025-04-01)
    The Sun's polar magnetic field is pivotal in understanding solar dynamo processes and forecasting future solar cycles. However, direct measurements of the polar field have only been available since the 1970s. The chromospheric ...
  • Formation of jet-driven forced reconnection region and associated plasma blobs in a prominence segment 
    Mishra, S. K; Srivastava, A. K; Rajaguru, S. P; Jelinek, P (American Astronomical Society, 2025-04-01)
    We use data from the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory to study the most likely formation of a forced reconnection region and associated plasma blobs, triggered by jetlike structures in ...
  • Disparities in magnetic cloud observations between two spacecraft having small radial and angular separations near 1 au 
    Agarwal, Anjali; Mishra, Wageesh (American Astronomical Society, 2025-04-01)
    Studies for inferring the global characteristics of coronal mass ejections (CMEs) from multipoint local in situ observations have been undertaken previously, but limited studies have utilized measurements from multiple ...

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