IIA Institutional Repository: Recent submissions

  • Investigating the kinematics of molecular gas in cometary globule L1616 
    Porel, Puja; Archana Soam; Karoly, Janik; Chung, Eun Jung; Lee, Chang Won (Oxford University Press on behalf of Royal Astronomical Society, 2025-10)
    LDN 1616 is a cometary globule located approximately 8◦ west of the Orion OB1 associations. The massive OB stars in the Orion belt region act as catalysts, triggering the star formation activity observed in the L1616 region ...
  • Distinct Fe K line complexes in MAXI J1744−294 revealed by XRISM high-resolution spectroscopy 
    Chatterjee, Kaushik; Mondal, Santanu; Palit, Biswaraj; Singh, Chandra B; Nath, Sujoy Kumar; Pahari, Mayukh; Kumar, Brajesh; Wang, W; Chang, Hsiang-Kuang; Liu, Xiaowei (American Astronomical Society, 2025-10-20)
    The newly discovered Galactic transient MAXI J1744−294 went into its first X-ray outburst in 2025. We study the spectral properties of this source in the 2–10 keV energy band during this outburst using X-ray data from the ...
  • Does DESI DR2 challenge ΛCDM paradigm? 
    Chaudhary, Himanshu; Capozziello, Salvatore; Sharma, Vipin Kumar; Mustafa, Ghulam (American Astronomical Society, 2025-10-20)
    Although the debate about the systematic errors of DESI DR1 is still open, recent DESI DR2 is consistent with DESI DR1 and further strengthens the results of DESI DR1. In our analysis, both the LRG1 point at zeff = 0.510 ...
  • Evolution of low surface brightness ultrathin galaxies: The role of dark matter halo and bar formation on disk thickness 
    Aditya, K; Banerjee, Arunima (American Astronomical Society, 2025-10-20)
    We investigate how stellar disks sustain their ultrathin structure throughout their evolution. We follow the evolution of ultrathin stellar disks with varying dark matter (DM) halo concentration (c) using collisionless ...
  • The effect of poloidal magnetic field and helicity injection in a breakout coronal mass ejection 
    Vashishtha, Nitin; Pant, V; Talpeanu, Dana-Camelia; Banerjee, D; Rastogi, Shantanu (American Astronomical Society, 2025-10-10)
    Coronal mass ejections (CMEs), as crucial drivers of space weather, necessitate a comprehensive understanding of their initiation and evolution in the solar corona in order to better predict their propagation. Solar Cycle ...
  • The 2021 hot-type symbiotic outburst of YY herculis: An optical follow-up study 
    Sonith, L. S; Kamath, U. S (American Astronomical Society, 2025-10-01)
    We have followed up on the hot-type classical symbiotic outburst reported in YY Her using the Himalayan Chandra Telescope. The outburst coincides with the secondary minima of the system. Approximately 12 similar brightening ...
  • Challenging classical paradigms: Recurrent nova M31N 2017-01e, a BeWD system in M31? 
    Chamoli, Shatakshi; Basu, Judhajeet; Barway, Sudhanshu; Anupama, G. C; Swain, Vishwajeet; Bhalerao, Varun (American Astronomical Society, 2025-10-01)
    M31N 2017-01e is the second-fastest recurrent nova known, with a recurrence period of 2.5 yr in the Andromeda galaxy (M31). This system exhibits a unique combination of properties: a low outburst amplitude (∼3 mag), starkly ...
  • When the wall fell: Study of polycyclic aromatic hydrocarbons in T chamaeleontis using JWST 
    Arun, R (American Astronomical Society, 2025-10)
    We investigate the polycyclic aromatic hydrocarbon (PAH) emission features of T Cha, a G8-type T Tauri star that has exhibited “seesaw”-type mid-infrared continuum variability over nearly two decades due to the destruction ...
  • A tale of three cataclysmic variables with distinct superhumps 
    Joshi, Arti; Tappert, C; Catelan, Marcio; Schmidtobreick, L; Singh, Mridweeka (EDP Sciences, 2025-10)
    Superhumps are among the most commonly observed variable features in the light curves of cataclysmic variables (CVs). To study the superhump behaviour of CVs, we present Transiting Exoplanet Survey Satellite (TESS) ...
  • Long-term monitoring of a dynamically new comet C/2020 V2 (ZTF) 
    Ahuja, Goldy; Aravind, K; Ganesh, S; Hmiddouch, Said; Donckt, Mathieu Vander; Jehin, E; Sahu, D. K; Sivarani, T (Oxford University Press on behalf of Royal Astronomical Society, 2025-10)
    Comet C/2020 V2 (ZTF, Zwicky Transient Facility) is categorized as a dynamically new long-period comet, making its first approach to the inner Solar system. We have observed this comet for around 32 months (from 2022 January ...
  • Polycyclic Aromatic Hydrocarbons in the circumstellar medium of Herbig Ae/Be stars 
    Arun, R; Mathew, Blesson; Shridharan, B; Ujjwal, K; Akhil, Krishna R; Maheswar, G; Kartha, Sreeja S (IOP Publishing, 2025-09)
    We present a comprehensive mid-infrared spectroscopic survey of 124 Herbig Ae/Be stars using newly processed Spitzer/IRS spectra from the newly released CASSISjuice database. Based on prominent dust and molecular signatures ...
  • Inflationary magnetogenesis beyond slow-roll and its induced gravitational waves 
    Atkins, Bill; Chowdhury, Debika; Marriott-Best, Alisha; Tasinato, Gianmassimo (American Physical Society, 2025-09-15)
    The origin of magnetic fields observed on both astrophysical and cosmological scales is a compelling problem that has the potential to shed light on the early Universe. We analytically investigate inflationary magnetogenesis ...
  • Predicting CME speed at 20R⊙ using machine learning approaches 
    Hegde, M (Springer Nature, 2025-09)
    Coronal mass ejections (CMEs) are significant drivers of space weather, and accurately predicting their propagation speed is crucial for mitigating their impact on Earth’s environment. In this study, we leverage machine ...
  • SN 2023vbg: a type IIn supernova resembling sn 2009ip, with a long-duration precursor and early-time bump 
    Goto, Sota; Yamanaka, Masayuki; Nagayama, Takahiro; Maeda, K; Kawabata, Miho; Sahu, D. K; Singh, A; Gangopadhyay, A; Dukiya, Naveen; Misra, Kuntal; Dubey, Monalisa; Ailawadhi, Bhavya (American Astronomical Society, 2025-09-10)
    Type IIn supernovae (SNe) resembling SN 2009ip (09ip-like SNe) originate from the interaction between circumstellar material (CSM) and the ejecta. This subclass not only shares similar observational properties around the ...
  • Transient LoBALs at high velocities: A case of extreme broad absorption line variability in J115636.82+085628.9 
    Aromal, P; Srianand, R; Gallagher, S. C; Vivek, M; Petitjean, P (American Astronomical Society, 2025-09-10)
    We present a multiepoch spectroscopic study of the broad absorption line (BAL) quasar J115636.82+085628.9 (zem = 2.1077), based on five spectra spanning nearly two decades in the observer’s frame. This source exhibits ...
  • B-fields and dust in interstellar filaments using dust polarization (BALLAD-POL). IV.Grain alignment mechanisms in the cocoon nebula (IC 5146) using polarization observations from JCMT/POL-2 
    Pravash, Saikhom; Hoang, Thiem; Archana Soam; Chung, Eun Jung; Diep, Pham Ngoc; Ngoc, Nguyen Bich; Tram, Le Ngoc (American Astronomical Society, 2025-09-01)
    The polarization of starlight and thermal dust emission from aligned nonspherical grains provides a powerful tool for tracing magnetic field morphologies and strengths in the diffuse interstellar medium to star-forming ...
  • Li enrichment in Red Clump Giants: Clues for past binary interaction or merger events 
    Singh, Raghubar; Reddy, B. E; Mallick, Anohita; Zhao, Gang (American Astronomical Society, 2025-09-01)
    To understand the underlying mechanisms of high Li abundances among core He-burning or red clump (RC) giants, we analyzed a sample of 5227 RC giants of mass M < 2 M⊙ using spectra and asteroseismic data. We found 120 RC ...
  • Redshift ∼2.7 is not special comment on the Kolmogorov analysis of JWST deep survey galaxies 
    Joseph, P (EDP Sciences, 2025-09)
    Galikyan et al. (2025, A&A, 696, L21) reported a statistically significant change in galaxy spectral properties at redshift z ' 2.7 based on a Kolmogorov Stochasticity Parameter analysis of JWST spectroscopic data of ...
  • Indian solar and heliospheric physics vision: Fundamental science to a space weather resilient society 
    Nandy, D; Pant, V; Anand, Megha; Athalathil, Jithu J; Awasthi, Arun Kumar; Bane, Kshitij; Banerjee, D; Ravindra, B; Bhaskar, Ankush; Bhattacharyya, R; Bhowmik, Prantika; Chandra, Ramesh; Chatterjee, Piyali; Chatterjee, Subhamoy; Dimri, A. P; Gokani, Sneha A; Hanasoge, S. M; Hazra, S; Jain, Rajmal; Joshi, B; Nagaraju, K; Kansabanik, Devojyoti; Karak, B. B; Kathiravan, C; Khan, Raveena; Krishnan, Hariharan; Kumar, Brajesh; Kumar, Sanjay; Kumari, Anshu; Majumdar, Satabdwa; Mayank, Prateek; Mishra, Sudheer K; Mishra, Wageesh; Mohan, Atul; Mondal, Surajit; Mugundhan, V; Narendranath, S; Oberoi, Divya; Pandya, Megha; Patel, Ritesh; Paul, Arghyadeep; Prasad, A; Sasikumar Raja, K; Rajhans, Abhishek; Ramesh, R; Saha, Chitradeep; Sankarasubramanian, K; Selvakumaran, R; Sharma, Rahul; Sharma, Rohit; Shrivastav, Arpit Kumar; Singh, Nishant; Soni, Shirsh Lata; Srivastava, Abhishek K; Srivastava, Nandita; Tripathi, Durgesh; Uddin, W; Vaidya, Bhargav; Vemareddy, P; Vichare, Geeta; Vigeesh, G; Yadav, Nitin; Yadav, V. K (Springer Nature, 2025-12)
    The Sun is the only star that harbours a planet known to host life. Our home, the Earth, and other solar system planets reside within the heliosphere – the sphere of influence of the Sun. Within this domain, the Sun’s ...
  • Short and intermediate periodicities in Ca II K plage areas as seen in Kodaikanal images for individual cycles from 14 to 22 
    Chowdhury, Partha; Priyal, M; Singh, J; Ravindra, B (Springer Nature, 2025-09)
    We analyze historical Ca II K images from the Kodaikanal Observatory (KO) spanning 1907 to 1996, encompassing Solar Cycles 14 through 22. These digitized images were processed using the Equal Contrast Technique (ECT) to ...

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