IIA Institutional Repository: Recent submissions

  • 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 ...
  • Clustering analysis of Ca I 4227 line polarization using magnetohydrodynamic simulations of the solar atmosphere 
    Mathur, Harsh; Anusha, L. S; Agnihotri, Devang (American Astronomical Society, 2025-04-10)
    The Ca i 4227 Å line is a strong resonance line formed in the solar chromosphere. At the limb, it produces the largest scattering polarization signal. So far, modeling the linear polarization in this line has been limited ...
  • Performance evaluation of phase plate and deformable mirror for adaptive optics (AO) system 
    Venkata Suresh, Narra; Sreekanth Reddy, V; Banyal, R. K; Prasad, B. R (Springer Nature, 2022-01-30)
    Spatial resolution of the ground-based optical telescopes is limited by the Earth’s atmospheric turbulence rather than the size of the telescope aperture. To restore the performance of a telescope to near diffraction ...
  • Unveiling the dynamics and genesis of small-scale fine-structure loops in the lower solar atmosphere 
    Bura, Annu; Samanta, T; Sterling, Alphonse C; Chen, Yajie; Joshi, Jayant; Yurchyshyn, Vasyl; Moore, Ronald L (American Astronomical Society, 2025-04-20)
    Recent high-resolution solar observations have unveiled the presence of small-scale loop-like structures in the lower solar atmosphere, often referred to as unresolved fine structures, low-lying loops, and miniature hot ...
  • A multiwavelength autopsy of the interacting type IIn supernova 2020ywx: tracing its progenitor mass-loss history for 100 yr before death 
    Baer-Way, Raphael; Chandra, Poonam; Modjaz, Maryam; Kumar, Sahana; Pellegrino, Craig; Chevalier, Roger; Crawford, Adrian; Sarangi, A; Smith, Nathan; Maeda, Keiichi; Nayana, A. J; Filippenko, Alexei V; Andrews, Jennifer E; Arcavi, Iair; Bostroem, K. Azalee; Brink, Thomas G; Dong, Yize; Dwarkadas, Vikram; Farah, Joseph R; Howell, D. Andrew; Hiramatsu, Daichi; Hosseinzadeh, Griffin; McCully, Curtis; Meza, Nicolas; Newsome, Megan; Gonzalez, Estefania Padilla; Pearson, Jeniveve; Sand, David J; Shrestha, Manisha; Terreran, Giacomo; Valenti, Stefano; Wyatt, Samuel; Yang, Yi; Zheng, WeiKang (American Astronomical Society, 2025-04-20)
    While the subclass of interacting supernovae (SNe) with narrow hydrogen emission lines (Type IIn supernovae (SNe IIn)) consists of some of the longest-lasting and brightest supernovae (SNe) ever discovered, their progenitors ...
  • Observations of temporal variations in the 5303 Å emission line during a coronal mass ejection without any associated solar flare 
    Priyal, M; Ramesh, R; Singh, J; Sasikumar Raja, K (American Astronomical Society, 2025-04-20)
    Reports using total solar eclipse data indicate that the 5303 Å emission line is a promising tool for observing the thermodynamic changes due to coronal mass ejections (CMEs) close to the Sun. The Visible Emission Line ...
  • On the million-degree signature of spicules 
    Bose, Souvik; Joshi, Jayant; Testa, Paola; Pontieu, Bart De (American Astronomical Society, 2025-04-10)
    Spicules have often been proposed as substantial contributors toward the mass and energy balance of the solar corona. While their transition region (TR) counterpart has unequivocally been established over the past decade, ...
  • Astronomy and society: the road ahead 
    Sule, A; Ramanujam, N. M; Maji, M; More, S; Yadav, V; Narayanan, A; Dhurde, S; Ganguly, J; Seetha, S; Srivastava, A. M; Shylaja, B. S; Wadadekar, Y (Springer Nature, 2025-06)
    Astronomy, of all the sciences, is possibly the one with the most public appeal across all age groups. This is also evidenced by the existence of a large number of planetaria and amateur astronomy societies, which are ...
  • First search for high-energy neutrino emission from galaxy mergers 
    Bouri, Subhadip; Parashari, Priyank; Mousumi Das; Laha, Ranjan (American Physical Society, 2025-03-15)
    The exact sources of high-energy neutrinos detected by the IceCube neutrino observatory still remain a mystery. For the first time, this work explores the hypothesis that galaxy mergers may serve as sources for these ...
  • Cosmological constraints on mass-varying dark matter 
    Chakraborty, Amlan; Das, Anirban; Das, Subinoy; Sethi, Shiv K (American Physical Society, 2025-03-15)
    As one of the fundamental unknowns of our Universe, the mass of dark matter remains to be a topic of great interest. We consider the possibility of a time-variation of the dark matter mass. We study the cosmological ...
  • Wigner distributions in Rindler spacetime and nonvacuum Minkowski states 
    Dubey, Nitesh K; Kolekar, Sanved (American Physical Society, 2025-03-15)
    In the 1970s, Fulling, Davies, and Unruh demonstrated that the vacuum state perceived by an inertial observer in Minkowski space appears as a thermal bath to a uniformly accelerated observer. We explore the transformation ...
  • Multiwavelength analysis of AT 2023sva: a luminous orphan afterglow with evidence for a structured jet 
    Srinivasaragavan, Gokul P; Perley, Daniel A; Ho, Anna Y. Q; O'Connor, Brendan; de Ugarte Postigo, A; Sarin, Nikhil; Cenko, S. Bradley; Sollerman, Jesper; Rhodes, Lauren; Green, D. A; Svinkin, Dmitry; Bhalerao, Varun; Waratkar, Gaurav; Nayana, A. J; Chandra, P; Miller, M. Coleman; Malesani, Daniele B; Ryan, Geoffrey; Srijan, Suryansh; Bellm, Eric C; Burns, Eric; Titterington, David J; Stone, Maria B; Purdum, Josiah; Ahumada, Tomas; Anupama, G. C; Barway, Sudhanshu; Coughlin, Michael W; Drake, Andrew J; Fender, Rob; Agui Fernandez, Jose F; Frederiks, Dmitry D; Geier, Stefan; Graham, Matthew J; Kasliwal, Mansi M; Kulkarni, S. R; Kumar, Harsh; Li, Maggie L; Laher, Russ R; Lysenko, Alexandra L; Parwani, Gopal; Perley, Richard A; Ridnaia, Anna V; Salgundi, Anirudh; Smith, Roger; Sravan, Niharika; Swain, Vishwajeet; Thone, C. C; Tsvetkova, Anastasia E; Ulanov, Mikhail V; Vail, Jada; Wise, Jacob L; Wold, Avery (Oxford University Press on behalf of Royal Astronomical Society, 2025-03)
    We present multiwavelength analysis of ZTF23abelseb (AT 2023sva), an optically discovered fast-fading ( Δmr=2.2 mag in Δt=0.74 d), luminous ( Mr∼−30.0 mag), and red ( g−r=0.50 mag) transient at z=2.28 with accompanying ...
  • B-fields and dust in interstellar filaments using dust polarization (BALLAD-POL). III. Grain alignment and disruption mechanisms in G34.43+0.24 using polarization observations from JCMT/POL-2 
    Pravash, Saikhom; Archana Soam; Diep, Pham Ngoc; Hoang, Thiem; Ngoc, Nguyen Bich; Tram, Le Ngoc (American Astronomical Society, 2025-03-10)
    Polarization of starlight and thermal dust emission due to aligned non-spherical grains helps us to trace magnetic field (B-field) morphology in molecular clouds and to study grain alignment mechanisms. In this work, we ...
  • Revitalizing image retrieval: AI enhancement and metaheuristic algorithm adaptation 
    Kumaravel, P; Thabasu Kannan, S (European Alliance for Innovation (EAI), 2025-01-17)
    INTRODUCTION: In recent years, development of digital technology has led to number of images, which can be stored in digital format. However, searching and retrieval of images in large image DB (Database) is a mammoth task. ...
  • The solar ultraviolet imaging telescope on board Aditya-L1 
    Tripathi, Durgesh; Ramaprakash, A. N; Padinhatteeri, Sreejith; Sarkar, Janmejoy; Burse, Mahesh; Tyagi, Anurag; Kesharwani, Ravi; Sinha, Sakya; Joshi, Bhushan; Deogaonkar, Rushikesh; Roy, Soumya; Nived, V. N; Gopalakrishnan, Rahul; Kulkarni, Akshay; Khan, Aafaque; Ghosh, Avyarthana; Rajarshi, Chaitanya; Modi, Deepa; Kumar, Ghanshyam; Yadav, Reena; Varma, Manoj; Bayanna, A. R; Chordia, Pravin; Karmakar, Mintu; Abraham, Linn; Adithya, H. N; Adoni, A. A; Ahmed, Gazi A; Banerjee, D; Bhargava Ram, B. S; Bhandare, Rani; Chatterjee, Subhamoy; Chillal, Kalpesh; Dey, A; Gandorfer, Achim; Gowda, Girish; Haridas, T. R; Jain, Anand; James, Melvin K; Jayakumar, R. P; Justin, Evangeline Leeja; Nagaraju, K; Kathait, Deepak; Khodade, Pravin; Kiran, Mandeep; Kohok, A; Krivova, Natalie A; Kumar, Nishank; Mehandiratta, Nidhi; Mestry, V. B; Motamarri, Srikanth; Mustafa, Sajjade F; Nandy, D; Narendranath, S; Navle, Sonal; Parate, Nashiket; Pillai, Anju M; Punnadi, Sujit; Rajendra, A; Ravi, A; Raha, Bijoy; Sankarasubramanian, K; Sarvar, Ghulam; Shaji, Nigar; Sharma, Nidhi; Singh, Aditya; Singh, Shivam; Solanki, S. K; Subramanian, Vivek; Rethika, T; Srikanth, T; Thatimattala, Satyannarayana; Tota, Hari Krishna; Vishnu, T. S; Unnikrishnan, Amrita; Vadodariya, Kaushal; Veeresha, D. R; Venkateswaran, R (Springer Nature, 2025-03)
    The Solar Ultraviolet Imaging Telescope (SUIT) is an instrument on the Aditya-L1 mission of the Indian Space Research Organization (ISRO) launched on 2 September 2023. SUIT continuously provides near-simultaneous full-disk ...

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