IIA Institutional Repository: Recent submissions

  • Estimation of the energy involved in a solar coronal mass ejection using spectroscopic observations in the 5303Å emission line 
    Ramesh, R; Priyal, M; Singh, J; Sasikumar Raja, K; Mishra, Wageesh; Monstein, C (American Astronomical Society, 2026-07-01)
    While the amount of solar coronal energy flux leaving the "quiet" Sun, coronal holes, and active regions has been estimated by many, similar calculations for transients like coronal mass ejections (CMEs) based on observations ...
  • On the relationship between solar spicules and propagating coronal disturbances: The role of shocks 
    Chaurasiya, Ravi; Srivastava, Sankalp; Chatterjee, Piyali; Dey, Sahel; Erdelyi, Robertus; Bayanna, A. R (American Astronomical Society, 2026-07-01)
    Spicules and propagating coronal disturbances (PCDs) are ubiquitous dynamic features of the solar atmosphere, yet their physical connection remains an open question of paramount importance to the mass and energy transport ...
  • Subluminous type IIP SN 2024abfl as a result of a significantly low-energy Fe-core collapse 
    Teja, Rishabh Singh; Sahu, D. K; Anupama, G. C; Singh, A; Dutta, Amrit; Rameshan, Gitika; Das, Hrishav; Kawabata, K. S; Singh, Mridweeka; Bhalerao, Varun (American Astronomical Society, 2026-07-01)
    We present extensive, well-sampled multiwavelength photometric and low-resolution optical spectroscopic observations of the low-luminosity Type IIP supernova (SN) SN 2024abfl. SN 2024abfl is found to be at the faintest end ...
  • BISTRO Survey: Gravity-dominated and magnetically regulated star formation in M17 SW 
    Zhao, Mengke; Qiu, Keping; Kang, Ji-hyun; Tang, Xindi; Whitworth, Anthony; Ward-Thompson, Derek; Onaka, Takashi; Lee, Chang Won; Bourke, Tyler L; Hwang, Jihye; Eden, David; Hoang, Thiem; Tamura, Motohide; Kwon, Jungmi; Priestley, Felix; Kim, Kee-Tae; Arzoumanian, Doris; Francesco, James Di; Eswaraiah, Chakali; Johnstone, Doug; Nguyen, Bich Ngoc; Chen, Zhiwei; Sadavoy, Sarah; Archana Soam; Furuya, Ray; Lai, Shih-Ping; Kwon, Woojin; Bastien, Pierre; Pattle, Kate; Berry, David (American Astronomical Society, 2026-07-01)
    We present high-resolution magnetic field maps of the M17 SW molecular cloud using JCMT 850 μm dust polarization at scale of 14″. The magnetic field exhibits a distinct arc-like structure that encircles three dense clumps ...
  • JWST spectroscopy of SNe Ia 2022aaiq and 2024gy: Evidence for enhanced central stable Ni abundance and a deflagration-to-detonation transition 
    Kwok, Lindsey A; Liu, Chang; Jha, Saurabh W; Blondin, Stephane; Larison, Conor; Miller, Adam A; Dai, Mi; Foley, Ryan J; Filippenko, A. V; Andrews, Jennifer E; Andrews, Moira; Auchettl, Katie; Badenes, Carles; Bostroem, K. Azalee; Brink, Thomas G; Koelln, Cristine; Davis, Kyle W; Flors, Andreas; Galbany, L; Graur, Or; Howell, D. A; Kumar, Sahana; Konyves-Toth, Reka; LeBaron, Natalie; Macrie, Colin W; Maeda, K; Maguire, Kate; McCully, Curtis; Retamal, Nicolas Meza; Padilla Gonzalez, E; Pakmor, Rudiger; Pearson, Jeniveve; Piro, Anthony L; Polin, Abigail; Rehemtulla, Nabeel; Cesar, Rojas-Bravo; Sand, D. J; Sangkachan, Chita; Schwab, Michaela; Sears, Huei; Singh, Mridweeka; Subrayan, Bhagya M; Taggart, Kirsty; Temim, Tea; Terwel, Jacco H; Tinyanont, S; Vinko, J; Wang, Xiaofeng; Wheeler, J. C; Yang, Y; Zheng, W (American Astronomical Society, 2026-07-01)
    We present optical + near-infrared + mid-infrared (MIR) observations of the normal Type Ia supernovae (SNe Ia) 2022aaiq and 2024gy in the nebular phase, continuously spanning 0.35─28 μm. Medium-resolution JWST spectroscopy ...
  • ALMA-QUARKS view of W49N: Multipolar episodic outflow associated with the most energetic galactic water maser 
    Jiao, Yunfan; Liu, Tie; Jiao, Wenyu; Xu, Feng-Wei; Gu, Qilao; Tang, Xindi; Mai, Xiaofeng; Luo, Qiuyi; Zhang, Siju; Goldsmith, Paul F; Lee, Chang Won; Garay, Guido; Yang, Yuhan; Gorai, Prasanta; Merello, Manuel; Garcia, Pablo; Dib, S; Hwang, Jihye; Hoque, Ariful; Juvela, Mika; Zhang, Yankun; Sanhueza, Patricio; Weng, Jixiang; Kim, Kee-Tae; Das, Swagat; Archana Soam; Baug, Tapas; Zhou, Jianjun; Bronfman, Leonardo; Yang, A.Y; Zhu, Lei (American Astronomical Society, 2026-07)
    We present a detailed investigation of a multipolar episodic molecular outflow in the ministarburst region W49N, which hosts the most luminous water maser in the Galaxy. Using high-resolution ( ∼0.″3 ) Atacama Large ...
  • Future null energy violation and minimal dark energy solutions to the Hubble tension 
    Manoharan, Manosh T (Elsevier B. V, 2026-07)
    Few phenomenological extensions of ΛCDM favour higher values of the Hubble parameter without introducing additional degrees of freedom, often at the cost of invoking phantom dynamics. We investigate ─ Phenomenological ...
  • Broad-band spectral and temporal study of OP 313 during its 2025 January very high energy flare 
    Manzoor, Aaqib; Ahanger, Sajad; Shah, Zahir; Vivek, M; Malik, Zahoor (Elsevier B.V, 2026-07)
    We present a comprehensive broadband temporal and spectral analysis of the transition blazar OP 313 using Swift and Fermi-LAT observations obtained during its recent very high energy (VHE) flaring activity. The one-day ...
  • Ultraviolet variability in radio-loud active galactic nuclei observed by UVIT onboard AstroSat 
    Reshma, M; Stalin, C. S; Mandal, A. K; Gudennavar, S. B; Benedict, Senorita; Joseph, P (Elsevier B.V., 2026-07)
    Radio-loud active galactic nuclei (AGN) are among the most luminous objects in the Universe, emitting radiation from low-energy radio waves to high energy γ-rays. They are well known to exhibit flux variations at nearly ...
  • Narrow-line Seyfert 1 galaxies in the dark energy spectroscopic instrument data release 1 
    Paliya, Vaidehi S; Rakshit, S; Dominguez, Alberto; Saikia, D. J; Stalin, C. S (American Astronomical Society, 2026-07)
    Narrow-line Seyfert 1 (NLSy1) galaxies are peculiar active galactic nuclei (AGN) known to exhibit a variety of intriguing observational features from low-frequency radio waves to high-energy γ-rays. As of now, NLSy1 catalogs ...
  • A 14-yr-old mystery: The peculiar case of the engine-driven SN 2012ap 
    Sfaradi, Itai; Margutti, R; Chornock, R; Nayana, A. J; Wiston, Eli; De Colle, Fabio; Clarke, T. E; Peters, Wendy M; Beniamini, Paz; Lu, Wenbin; Duran, Rodolfo Barniol; Bietenholz, M; Christy, Collin T; Coppejans, D. L; Drout, Maria R; Ibrahimzade, Dina; Michałowski, M. J; Milisavljevic, D; Omand, Conor M. B; Wang, Yihan; Alexander, Kate D; Badenes, Carles; Bright, J. S; Granot, Jonathan; Hammerstein, Erica; Jacobson-Galan, W. V; LeBaron, Natalie; Murase, Kohta; Rameshan, Gitika; Sears, Huei; Stroh, Michael; Terreran, Giacomo (American Astronomical Society, 2026-07-01)
    We present late-time (δt > 3000 days) optical (Keck), X-ray (Chandra and the Nuclear Spectroscopic Telescope Array), and radio (the Very Large Area, the Atacama Large Millimeter/submillimeter Array, and the Upgraded Giant ...
  • Early dark energy beyond slow-roll: Implications for cosmic tensions 
    Sharma, Ravi Kumar; Das, Subinoy; Poulin, Vivian (American Physical Society, 2024-02-15)
    In this work, we explore the possibility that early dark energy (EDE) is dynamical in nature and study its effect on cosmological observables. We introduce a parametrization of the equation of state allowing for an equation ...
  • Three-phase evolution of aspect ratio in fast and slow CMEs from the Sun to 1 au 
    Mishra, Wageesh; Agarwal, Anjali; Srivastava, N (Oxford University Press on behalf of Royal Astronomical Society, 2026-07)
    Coronal mass ejections (CMEs) undergo significant geometric evolution as they propagate from the Sun to 1 au, influencing their radial size, expansion, and space weather impact. We investigate the evolution of CME aspect ...
  • Designing a sky-scanning Fabry–Perot interferometer system with a large size integrating sphere 
    Mahavarkar, Prasanna; Sriram, S; Joshi, Bhagyashree; Hasan, Amirul; Remya, B. S; Chandra, Sarvesh (Elsevier B.V., 2023-12)
    Integrating spheres can be manufactured at sizes ranging from 1 mm to 3 m in diameter. It has been agreed widely by manufacturers that fitting a large-sized integrating sphere as per the customer requirement is a complex ...
  • Chemodynamic studies of the galaxy 
    Deepak (Indian Institute of Astrophysics, 2022-04)
    Based on data from large spectroscopic surveys like the GALactic Archaeology with HERMES (GALAH) and the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST), along with astrometric and photometric data from ...
  • Three extremely metal-poor stars: Discovery of a new CEMP-no star 
    Goswami, P. P; Goswami, A (Oxford University Press on behalf of Royal Astronomical Society, 2026-07)
    We have conducted detailed high-resolution spectroscopic studies on three extremely metal-poor (EMP) stars HE 0401−0138, HE 1153−0518, and HE 1246−1344. For the stars HE 0401−0138 and HE 1246−1344, we have estimated the ...
  • Probing spectral variability in NGC 4490 ULX-8 over 24 yr of XMM–Newton, Chandra, and Swift-XRT observations 
    Vashisht, Tarang; Beri, Aru; Ghosh, Tanuman; Upadhyay, Aman; Rana, Vikram (Oxford University Press on behalf of the Royal Astronomical Society, 2026-07)
    We present a spectral variability study of the ultraluminous X-ray source NGC 4490 ULX-8 based on 14 Chandra, 6 XMM– Newton, and 19 Swift-XRT observations obtained between 2000 and 2024. The X-ray spectra are modelled using ...
  • High-precision K2/TESS photometry and HERMES spectroscopy of four bright field stars 
    Trust, Otto; Joshi, S; Nsamba, Benard; Aol, Sharon; Vermeulen, Owen; Ssembatya, Ronald; De Cat, P; Lampens, P; Barnes, Sydney A; Goswami, P. P; Dileep, Athul; Ghosh, S. C; Kumar, Pramod; Jurua, E; Sarkar, M; Bedi, Sarabjeet S (Oxford University Press on behalf of the Royal Astronomical Society, 2026-07)
    Space-based photometry from K2 and TESS, coupled with high-resolution spectroscopy, provides a unique opportunity to re-examine the variability and chemical nature of four brightstars(HD 73135, BD +19◦ 2045, BD +19◦ 2046, ...
  • A consistency check for the calibration of 5303Å solar coronal emission line observations with Aditya-L1/VELC 
    Priyal, M; Ramesh, R; Singh, J; Sasikumar Raja, K; Savarimuthu, P (Springer Nature, 2026-06)
    We carried out radiometric calibration of the Visible Emission Line Coronagraph (VELC) onboard Aditya-L1 at 5303Å using observations of the Sun itself, a novel approach compared to the calibration using bright stars in the ...
  • Dwarf and intermediate-mass galaxies in MaNGA: Evidence for different evolutionary trends 
    Chandan, Watts; Gothai, L; Barway, Sudhanshu (American Astronomical Society, 2026-06-20)
    We investigate the interplay between morphology, specific star formation rate (sSFR), and local environment using a sample of 7408 galaxies from the fourth-generation Sloan Digital Sky Survey Mapping Nearby Galaxies at ...

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