IIA Institutional Repository: Recent submissions

  • A study of two Type IIb supernovae: SNe 2008aq and 2019gaf 
    Singh, Mridweeka; Sahu, D. K; Dastidar, R; Teja, Rishabh Singh; Gangopadhyay, A; Anupama, G. C; Howell, D. A; Bostroem, K. Azalee; McCully, Curtis; Burke, Jamison; Joshi, Arti; Hiramatsu, Daichi; Im, Hyobin; Srivastav, S; Misra, K (Oxford University Press on behalf of Royal Astronomical Society, 2026-02)
    We present photometric and spectroscopic studies of two core-collapse supernovae (SNe) 2008aq and 2019gaf in the optical wav elengths. Light curv e and spectral sequence of both the SNe are similar to those of other Type ...
  • Optical observations of the fast nova V1674 herculis 
    Rawat, Neeraj Singh; Sonith, L. S; Kamath, U. S; Bhargava, Yash; Anupama, G. C; Singh, K. P (Oxford University Press on behalf of Royal Astronomical Society, 2026-04)
    We present the evolution of optical spectra and light curves of the fast nova V1674 Herculis during 150 d past its eruption. Using the post-eruption AAVSO light curv e, w e hav e calculat ed the orbital period of V1674 Her ...
  • Structure and magnetic field of the bright-rimmed cloud IC 1396E/SFO 38 
    Sugitani, Koji; Wouterloot, Jan G. A; Parsons, Harriet; Graves, Sarah; Kusune, Takayoshi; Archana Soam (Oxford University Press on behalf of the Astronomical Society of Japan, 2026-02)
    We carried out polarimetric observations of the bright-rimmed cloud IC 1396E/SFO 38 with SCUBA-2/POL-2 to study the effect of ultraviolet (UV) light on its structure and magnetic field. This bright-rimmed cloud appears ...
  • Kinematics of acceleration-induced excitations in confined quantum fields 
    Shah, Hemansh; Kolekar, Sanved (American Physical Society, 2026-02-15)
    We investigate quantum field excitations in a rigid cavity that undergoes a transition from inertial motion to uniform acceleration while maintaining constant proper length. By constructing exact Bogoliubov transformations ...
  • Forecasting constraints on nonthermal light massive relics from future CMB experiments (CMB-S4/Simons Observatory) 
    Banerjee, Arka; Bhattacharjee, A; Das, Subinoy; Maharana, Anshuman; Sharma, Ravi Kumar (American Physical Society, 2026-02-15)
    Precise measurements of the cosmological impact of dark sector relics can shed light on physics beyond the Standard Model. In this work we present Fisher forecasts on nonthermal light massive relics (LiMR) models for a ...
  • Dust-obscured radio-emitting tidal disruption event coincident with a high-energy neutrino event 
    Zhou, Tianyao; Shu, Xinwen; Mou, Guobin; Yang, Lei; Sun, Luming; Peng, Fangkun; Zhang, Fabao; Ding, Hucheng; Jiang, Ning; Wang, Tinggui; Chandola, Yogesh; Liu, Daizhong; Dou, L; Wang, Yibo; Wang, Jianguo; Wu, Zhongzu; Yang, Chenwei (American Physical Society, 2026-02-15)
    Despite the growing number of high-energy neutrinos (TeV–PeV) detected by IceCube, their astrophysical origins remain largely unidentified. Recent observations have linked a few tidal disruption events (TDEs) to the ...
  • Dynamical and photometric analysis of NGC146 and king 14: Evidence for a comoving, unbound cluster pair 
    Bisht, D; Jiang, Ing-Guey; Elsanhoury, W. H; Belwal, Kuldeep; Cinar, D. C; Raj, A; Biswas, S; Dattatrey, Arvind K; Rangwal, Geeta; Sariya, Devesh P; Bisht, Mohit Singh; Durgapal, Alok (American Astronomical Society, 2026-02)
    To understand the nature of the NGC 146–King 14 cluster pair, we conducted a detailed photometric, astrometric, and dynamical study using multiwavelength data from Gaia DR3, Pan-STARRS1, WISE, and TESS. Using a probabilistic ...
  • Characterization of an optical transfer function–based phasing technique for India’s large segmented mirror telescope 
    Radhika, Dharmadhikari; Parihar, P. S (American Astronomical Society, 2026-02)
    The upcoming 10 m class large Indian telescope is proposed to be built using segmented mirror technology. To achieve diffraction-limited image quality with a segmented mirror telescope, it is important to phase mirror ...
  • Two epochs of VLBI observations of eight KISSR seyfert and LINER galaxies: Suggestions of fast and filamentary outflows 
    Kharb, P; Caproni, Anderson; Ghosh, Salmoli; Schwartz, Daniel A; Mousumi Das; Subramanian, S; Vaddi, Sravani (American Astronomical Society, 2026-02-01)
    We present here the results from a second epoch of phase-referenced VLBA observations of eight Seyfert and LINER galaxies from the KISSR sample. These sources were chosen based on the presence of double peaks or asymmetries ...
  • Can dwarf spheroidal galaxies host a central black hole? 
    Aditya, K; Mangalam, A (American Astronomical Society, 2026-02-01)
    We construct mass models of Milky Way dwarf spheroidal galaxies to place constraints on the central black hole masses they can host. We model the galaxies as a three-component system consisting of the stars, dark matter ...
  • The ALMA-QUARKS survey: Hot molecular cores are a long-standing phenomenon in the evolution of massive protostars 
    Meng, Dezhao; Liu, Tie; Esimbek, Jarken; Qin, Sheng-Li; Garay, Guido; Goldsmith, Paul F; Zhou, Jianjun; Tang, Xindi; Jiao, Wenyu; Zhang, Yan-Kun; Xu, Feng-Wei; Zhang, Siju; Tej, Anandmayee; Bronfman, Leonardo; Yang, A.Y; Dib, S; Das, Swagat; Hwang, Jihye; Archana Soam; Qiu, Yisheng; Li, Dalei; He, Yuxin; Wu, Gang; Dewangan, Lokesh; Chibueze, J. O; Garcia, Pablo; Gorai, Prasanta; Bhadari, Naval Kishor; Zhang, Yong; Sanhueza, Patricio; Luo, Yongquan; Zou, Jia-Hang; Kim, Kee-Tae; Yang, Dongting; Zhu, Lei; Liu, Xunchuan; Gordon, Macleod; Ma, Yingxiu (American Astronomical Society, 2026-02-01)
    We present an analysis of the QUARKS survey sample, focusing on protoclusters where hot molecular cores (HMCs; traced by CH3CN (12–11)) and HC/UC H II regions (traced by H30α/H40α) coexist. Using the high resolution, ...
  • Hint of dark matter–dark energy interaction in DESI DR2 and current cosmological dataset? 
    Chakraborty, Amlan; Ray, Tulip; Das, Subinoy; Banerjee, Arka; Vidhya, G (American Astronomical Society, 2026-02-10)
    We present new constraints on an interacting dark matter–dark energy scenario motivated by string compactification, where a scalar field adiabatically tracks the minimum of an effective potential sourced by dark matter ...
  • Imaging the LkCa 15 system in polarimetry and total intensity without self-subtraction artefacts 
    Swastik, C; Wahhaj, Zahed; Benisty, Myriam; Arora, S; Ginski, Christian; Ren, Bin B; van Holstein, R. G; De Rosa, R; Banyal, R. K; Tazaki, Ryo (EDP Sciences, 2026-02)
    Context. Studying young proto-planetary discs is essential for understanding planet formation, but traditional angular differential imaging introduces self-subtraction artefacts that make their small-scale structure difficult ...
  • The molecular and atomic hydrogen gas content of the Bootes Void galaxy CG 910 
    Sharma, Ekta; Biswas, Prerana; Mousumi Das; Winkel, Benjamin; Li, Di; Zheng, Zheng (EDP Sciences, 2026-02)
    Context. Void galaxies are located in the most under-dense environments of the Universe, where the number density of galaxies is extremely low. They are, hence, good targets for studying the secular evolution of galaxies ...
  • Bar evolution in edge-on galaxies: A demographic study of boxy/peanut bulges 
    Samanta, Atul A; Ankit Kumar; Mousumi Das; Artale, M. Celeste (EDP Sciences, 2026-02)
    Context. Boxy/peanut and X-shaped (BP/X) bulges are prominent features in edge-on disk galaxies and they are believed to represent vertically thickened bars. Despite their relevance in bar evolution, a statistically robust ...
  • Relative strengths of fundamental and harmonic emissions of solar radio type ii bursts 
    Jha, Rishikesh G; Raja, K. S; Ramesh, R; Kathiravan, C; Monstein, C (Springer Nature, 2025-12)
    Solar radio type II bursts are slow-drifting bursts that exhibit various distinct features such as Fundamental (F) and Harmonic (H) emissions, band-splitting, and discrete fine structures in the dynamic spectra. Observationally, ...
  • Quasi-biennial oscillations and rieger-type periodicities in a babcock–leighton solar dynamo 
    Pawan Kumar, S; Ravindra, B; Chowdhury, Partha; Karak, B. B (EDP Sciences, 2026-01)
    Context. The Sun’s magnetic field exhibits the 11 year solar cycle as well as shorter periodicities, popularly known as the quasibiennial oscillations (QBOs) and Rieger-type periods. Although several theories have been ...
  • Broad-band modelling of the GRB 230812B afterglow: Implications for very-high-energy-ray detections with IACTs 
    Mohnani, S; Banerjee, Biswajit; Miceli, D; Nava, L; Oganesyan, G; Tiwari, P; Ierardi, A; De Santis, A. L; Macera, S; Shukla, A; Branchesi, M; Chatterjee, Swarna; Agarwal, Sushmita; Datta, Abhirup; Yadav, K. K; Anupama, G. C (EDP Sciences, 2026-01)
    A significant fraction of the energy from the gamma-ray burst (GRB) jets, after powering the keV─MeV emission, forms an ultra-relativistic shock propagating into the circum-burst medium. The particles in the medium accelerate ...
  • Dance to demise—how massive stars may form dense circumstellar shells before explosion 
    Sengupta, Sutirtha; Sujit, Das; Sarangi, Arkaprabha (American Astronomical Society, 2026-01-01)
    We investigate the evolution of red supergiant (RSG) progenitors of core-collapse supernovae (SNe) with initial masses between 12 and 20 M⊙, focusing on the effects of enhanced mass loss due to pulsation-driven instabilities ...
  • Radio follow-up observations of a weak-line quasar exhibiting remarkable x-ray variability 
    Chhipa, Ayushi; Vivek, M; Nayana, A. J; Kharb, P; Brandt, W. N; Jagannathan, Preshanth; Baghel, J; Ezhikode, Savithri H; Ishwara-Chandra, C. H (American Astronomical Society, 2026-01-01)
    SDSS J1539+3954 (z ≍ 1.935), a radio-quiet weak-line quasar (WLQ), exhibited exceptional X-ray variability in 2019─2020, with its X-ray flux increasing by over 20 times from 2013 to 2019 and subsequently dropping by at ...

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