IIAP Publications: Recent submissions

  • 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, Arkaprabha; 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 ...
  • Evolution of photospheric magnetic field and electric currents during the X1.6 Flare in active region NOAA 12192 
    Chowdhury, Partha; Ravindra, B; Tiwari, Sanjiv K (Springer Nature, 2025-03)
    The dynamics of magnetic fields in the Sun’s active regions play a key role in triggering solar eruptions. Studies have shown that changes in the photosphere’s magnetic field can destabilize the large-scale structure of ...
  • New JWST redshifts for the host galaxies of CDF-S XT1 and XT2: understanding their nature 
    Quirola-Vasquez, J; Bauer, Franz E; Jonker, Peter G; Levan, A; Brandt, W. N; Ravasio, M; Eappachen, D; Xue, Y. Q; Zheng, X. C (EDP Sciences, 2025-03)
    Aims. CDF-S XT1 and XT2 are considered two "canonical" extragalactic fast X-ray transients (FXTs). In this work, we report new constraints on both FXTs, based on recent JWST NIRCam and MIRI photometry, as well as NIRspec ...
  • Exploring the disc-jet scenario in 3C 273 using simultaneous XMM-Newton and NuSTAR observations 
    Pandey, Ashwani; Mondal, Santanu; Wiita, Paul J (EDP Sciences, 2025-03)
    Context. The well-studied active galactic nucleus (AGN) 3C 273 displays characteristics of both jetted-AGNs and Seyfert galaxies, which makes it an excellent source to study the disc-jet connection in AGNs. Aims. We aim ...
  • Baryonic ecosystem in galaxies (BEINGMgII): II. Unveiling the nature of galaxies harbouring cool gas reservoirs 
    Das, Sarbeswar; Joshi, Ravi; Chaudhary, Reena; Fumagalli, Michele; Fossati, Matteo; Peroux, Celine; Ho, Luis C (EDP Sciences, 2025-03)
    We search for the galaxies associated with the intervening Mg II absorbers over a redshift range of 0.4 ≤ z ≤ 1 using imaging data from DESI Legacy Imaging Surveys and measure the redshift based on the direct detection of ...
  • Broad absorption line outflows are common in low Eddington ratio active galactic nuclei 
    Vivek, M; Wylezalek, D (EDP Sciences, 2025-03)
    Context. Broad absorption line (BAL) quasars exhibit significant outflows, offering insights into active galactic nucleus (AGN) feedback. While typically associated with high Eddington ratios, BAL quasars also occur in low ...
  • Study of giant radio galaxies using spectroscopic observations from the Himalayan Chandra Telescope 
    Sethi, S; Dabhade, Pratik; Biju, K. G; Stalin, C. S; Jamrozy, M (EDP Sciences, 2025-03)
    We present the results of spectroscopic observations of host galaxies of eleven candidate giant radio galaxies (GRGs), powered by active galactic nuclei (AGNs), conducted with the 2-m Himalayan Chandra Telescope (HCT). The ...
  • SN 2021foa: the bridge between SN IIn and Ibn 
    Gangopadhyay, A; Dukiya, Naveen; Moriya, Takashi J; Tanaka, M; Maeda, K; Howell, D. A; Singh, Mridweeka; Singh, Avinash; Sollerman, Jesper; Kawabata, K. S; Brennan, Sean J; Pellegrino, Craig; Dastidar, R; Nakaoka, Tatsuya; Kawabata, Miho; Misra, K; Schulze, Steve; Chandra, P; Taguchi, Kenta; Sahu, D. K; McCully, Curtis; Bostroem, K. Azalee; Gonzalez, Estefania Padilla; Newsome, Megan; Hiramatsu, Daichi; Takei, Yuki; Yamanaka, Masayuki; Tajitsu, A; Isogai, Keisuke (Oxford University Press on behalf of Royal Astronomical Society, 2025-03)
    We present the long-term photometric and spectroscopic analysis of a transitioning SN IIn/Ibn from −10.8 d to 150.7 d post V -band maximum. SN 2021foa shows prominent He I lines comparable in strength to the H α line around ...
  • Observations and modeling of two Type IIP supernovae in M61: similar yet so different 
    Teja, Rishabh Singh; Anupama, G. C; Sahu, D. K (Published by Cambridge University Press on behalf of International Astronomical Union, 2024)
    We present photometric and spectroscopic studies of two type IIP SNe (SN 2008in and SN 2020jfo), to infer their physical parameters. These SNe exploded in the same host galaxy, M 61 (NGC 4303), at different epochs. SN ...

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