IIA Institutional Repository: Recent submissions

  • 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 ...
  • 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 ...

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