IIA Institutional Repository: Recent submissions

  • Λ(t)CDM model: Cosmological implications and dynamical system analysis 
    Chaudhary, Himanshu; Mandal, Ratul; Bashir, Masroor; Sharma, Vipin Kumar; Debnath, Ujjal (IOP Publishing, 2026-04)
    We investigated a time-varying cosmological constant model using recent BAO measurements from DESI DR2, combined with Type Ia supernova samples (Pantheon +, DES-Dovekie, and Union3) and CMB shift parameters, to constrain ...
  • Magnetic field disturbances in the martian ionosphere: Competing roles of ionospheric currents and solar wind interaction 
    Leelavathi, V; Rao, N. V; Pavan, D. G (Wiley on behalf of American Geophysical Union, 2026-04)
    We examine disturbances in the total magnetic field in the Martian ionosphere at altitudes of 150–1,000 km and investigate their potential sources, focusing on ionospheric density variations and solar wind dynamic pressure ...
  • B-fields and dust in interstellar filaments using dust polarization (BALLAD-POL). VI. grain alignment mechanisms in the massive quiescent filament G16.96+0.27 using dust polarization observations from JCMT/POL-2 
    Pravash, Saikhom; Hoang, Thiem; Archana Soam; Gu, Qi-Lao; Liu, Tie; Diep, Pham Ngoc; Tram, Le Ngoc; Ngoc, Nguyen Bich (American Astronomical Society, 2026-04)
    Dust polarization induced by aligned nonspherical grains acts as an important tool to trace the magnetic field (B-field) morphologies and strengths in molecular clouds and constrain grain properties and their alignment ...
  • Constraining the onset height of coronal mass ejection driven shocks using near-Sun observations in visible and radio wavelengths 
    Kathiravan, C; Priyal, M; Ramesh, R (Springer Nature, 2026-06)
    One of the debated issues about the onset of the type II radio bursts near the Sun is the heliocentric distance (r) at which the associated magnetohydrodynamic (MHD) shocks are formed, and the association of the latter ...
  • Memory effects and entanglement dynamics of finite time acceleration 
    Dubey, Nitesh K; Kolekar, Sanved (American Physical Society, 2026-04-15)
    We construct a smooth trajectory in Minkowski spacetime that is inertial in the asymptotic past and future but undergoes approximately uniform acceleration for a finite duration. In a suitable limit, this trajectory ...
  • Probing departures from ΛCDM by late-time datasets 
    Chaudhary, Himanshu; Sharma, Vipin Kumar; Capozziello, Salvatore; Mustafa, Ghulam (American Astronomical Society, 2026-04)
    Observational data play a pivotal role in identifying cosmological models that are both theoretically consistent and empirically viable. In this work, we investigate the level of preference for dynamical dark energy over ...
  • Non-Gaussian expansion of Minkowski tensors in redshift space 
    Appleby, S; Pichon, C; Pravabati, C; Pogosyan, Dmitri; Park, C (American Astronomical Society, 2026-04-20)
    This paper focuses on extending the use of Minkowski tensors to analyze anisotropic signals in cosmological data, focusing on those introduced by redshift space distortions. We derive the ensemble average of the two ...
  • The evolution of the reconnection flux during the eruption of magnetic flux ropes 
    Maity, Samriddhi Sankar; Chatterjee, Piyali; Sarkar, Ranadeep; Mytheen, Ijas S (American Astronomical Society, 2026-04-01)
    Coronal mass ejections (CMEs) are powerful drivers of space weather, with magnetic flux ropes (MFRs) widely regarded as their primary precursors. However, the variation in the reconnection (RC) flux during the evolution ...
  • SN 2017hcc and SN2023usc—A comparative spectroscopic study of type IIn supernovae 
    Sethulakshmi, V; Sutaria, F. K; Sharma, Riddhiman; Ray, A (American Astronomical Society, 2026-04-20)
    We report on a spectroscopic study of the bright, nearby type IIn supernovae SN 2017hcc and SN 2023usc using data obtained from the Himalayan Chandra Telescope. SN 2017hcc is a well-studied event, and our sampling covers ...
  • Stratification of the active galactic nucleus─driven multiphase outflows in the dwarf Seyfert galaxy NGC 4395 
    Nandi, Payel; Colina, Luis; Riffel, R. A; Pereira Santaella, Miguel; Stalin, C. S; Saikia, D. J; Álvarez-Márquez, Javier; Kissler-Patig, Markus (American Astronomical Society, 2026-04-20)
    We present a multiwavelength study of nuclear outflows in the nearby dwarf Seyfert galaxy NGC 4395, which hosts an intermediate-mass black hole. Using JWST/NIRSpec and MIRI integral-field-unit spectroscopy (1.66–28.6 ...
  • Fading echoes of interaction: Probing centuries of preexplosion mass loss in four type IIn supernovae 
    Hillenkamp, Elizabeth; Baer-Way, Raphael; Chandra, P; Sarangi, Arkaprabha; Chevalier, Roger; Nayana, A. J; Deutsch, Annika; Maeda, K; Smith, Nathan (American Astronomical Society, 2026-04-10)
    Supernovae characterized by enduring narrow optical hydrogen emission lines (SNe IIn) are believed to result primarily from the core-collapse of massive stars undergoing sustained interaction with a dense circumstellar ...
  • Understanding the formation and eruption of sigmoidal structure through data-driven modeling of magnetic evolution in solar active region 13500 
    Vemareddy, P; Nair, Sreejith S; Gosain, S (American Astronomical Society, 2026-04-10)
    We investigate the magnetic origin of the coronal mass ejection that occurred on 2023 November 28 at 19:50 UT from NOAA Active Region 13500 located near the solar disk center. The eruption was associated with an S-shaped ...
  • Design and implementation of an upgraded electrical control system for the Vainu Bappu Telescope hydraulic platform 
    Dhanalal, K; Ramachandran, A; Kesavan, K; Satheesh Kumar, N; Veerpandiyan, M; Pandiyarajan, B; Naveen Kumar, R; Arjunan, M.S (Indian Institute of Astrophysics, 2026-06-12)
    This paper details the design, fabrication, and performance evaluation of a newly implemented hydraulic control system for the 2.3m Vainu Bappu Telescope (VBT) Cassegrain platform. The hydraulic platform is a critical ...
  • Photometry and spectroscopy of SN 2024pxl: A luminosity link among type Iax supernovae 
    Singh, Mridweeka; Kwok, Lindsey A; Jha, Saurabh W; Dastidar, R; Larison, Conor; Filippenko, A. V; Andrews, Jennifer E; Andrews, Moira; Anupama, G. C; Arunachalam, Prasiddha; Auchettl, Katie; Banhidi, Dominik; Barna, Barnabas; Bostroem, K. Azalee; Brink, Thomas G; Cartier, Regis; Chen, Ping; Christy, Collin T; Coulter, David A; Covarrubias, Sofia; Davis, Kyle W; Dickinson, Connor B; Dong, Yize; Farah, Joseph R; Flors, Andreas; Foley, Ryan J; Franz, Noah; Fremling, Christoffer; Galbany, L; Gangopadhyay, A; Garg, Aarna; Gates, Elinor L; Graur, Or; Gordon, Alexa C; Hiramatsu, Daichi; Hoang, Emily; Howell, D. A; Hsu, Brian; Johansson, J; Joshi, Arti; Kahinga, Lordrick A; Kaur, Ravjit; Kumar, Sahana; Kumnurdmanee, Piramon; Kuncarayakti, H; LeBaron, Natalie; Lidman, C; Liu, Chang; Maeda, K; Maguire, Kate; Martin, Bailey; McCully, Curtis; Mehta, Darshana; Menotti, Luca M; Metevier, Anne J; Miller, Adam A; Misra, K; Murphey, C. Tanner; Newsome, Megan; Padilla Gonzalez, E; Patra, Kishore C; Pearson, Jeniveve; Piro, Anthony L; Polin, Abigail; Ravi, Aravind P; Rest, Armin; Rehemtulla, Nabeel; Retamal, Nicolas Meza; Robinson, Olivia M; Rojas-Bravo, Cesar; Sahu, D. K; Sand, D. J; Schmidt, B. P; Schulze, Steve; Schwab, Michaela; Shrestha, Manisha; Siebert, Matthew R; Simha, Sunil; Smith, Nathan; Sollerman, Jesper; Srivastav, S; Subrayan, Bhagya M; Szalai, Tamas; Taggart, Kirsty; Teja, Rishabh Singh; Terwel, Jacco H; Tinyanont, S; Valenti, S; Vinko, J; Westerling, Aya L; Wheeler, J. C; Yang, Yi; Zheng, W (American Astronomical Society, 2026-03-10)
    We present extensive ultraviolet to optical photometric and optical to near-infrared (NIR) spectroscopic follow-up observations of the nearby intermediate-luminosity (MV = −16.81 ± 0.19 mag) Type Iax supernovae (SNe Iax) ...
  • Gaia24ccy: An outburst followed the footsteps of its predecessor 
    Singh, Koshvendra; Ninan, J. P; Guo, Zhen; Ivanov, Valentin D; Buckley, David A. H; Ojha, D. K; Monson, Andrew; Chand, Tarak; Sharma, S; Yadav, Ram Kesh; Sahu, D. K; Kumar, Pramod; Elbakyan, Vardan; Nayakshin, Sergei; Fermiano, Vitor; Fang, Min; Borissova, Jura; Chen, Wen Ping; Hambsch, Franz-Josef; Kurtev, Radostin; Morris, Calum; Osses, Javier; Rodríguez, Vania; Sharma, Tanvi; Bandari, Srikanth; Thanathibodee, Thanawuth; Wang, Wei-Hao; Zhou, Yuting (American Astronomical Society, 2026-03-20)
    Accretion-driven outbursts in young stellar objects remain poorly understood, largely limited by a statistically small sample of closely followed-up events. This underscores the importance of a thorough exploration of each ...
  • LIGO/Virgo/KAGRA neutron star merger candidate S250206dm: Zwicky transient facility observations 
    Ahumada, Tomas; Anand, Shreya; Bulla, Mattia; Gupta, Vaidehi; Kasliwal, Mansi M; Stein, Robert; Karambelkar, Viraj; Bellm, Eric C; Jegou du Laz, Theophile; Coughlin, Michael W; Andreoni, Igor; Banerjee, Smaranika; Bochenek, Aleksandra; Hinds, K. -Ryan; Hu, Lei; Palmese, Antonella; Perley, Daniel A; Pletskova, Natalya; Salgundi, Anirudh; Singh, A; Sollerman, Jesper; Swain, Vishwajeet; Wold, Avery; Bhalerao, Varun; Cenko, S. Bradley; Cook, David O; Copperwheat, Christopher M; Graham, Matthew J; Kaplan, David L; Singer, Leo P; Sravan, Niharika; Busmann, Malte; Gassert, Julius; Gruen, Daniel; Sommer, Julian; Zhang, Yajie; Amsellem, Ariel; Cabrera, Tomas; Hall, Xander J; Kunnumkai, Keerthi; O’Connor, Brendan; Barna, Tyler; Nunes, Felipe Fontinele; Toivonen, Andrew; Sasli, Argyro; Masci, Frank J; Chen, Tracy X; Dekany, Richard; Purdum, Josiah; Le Calloch, Antoine; Anupama, G. C; Barway, Sudhanshu (IOP Publishing, 2026-03)
    We present the searches conducted with the Zwicky Transient Facility (ZTF) in response to S250206dm, a bona fide event with an online false alarm rate of one in 25 yr, detected by the International Gravitational Wave ...
  • Anomalous narrow line Seyfert I galaxies from SDSS DR17 
    Tiwari, Arihant; Rachana; Vivek, M; Rakshit, S (American Astronomical Society, 2026-03-01)
    We present an analysis of 22,656 narrow-line Seyfert 1 galaxies (NLSy1s) from the Sloan Digital Sky Survey (SDSS) DR17 (0.1 ≤ z ≤ 0.9), identifying a sample of spectroscopically anomalous sources. These anomalies were ...
  • Type Iax supernovae as a source of iron-rich silicate dust 
    Kumar, Aman; Sarangi, Arkaprabha (American Astronomical Society, 2026-03-10)
    We model the formation of dust in the ejecta of Type Iax supernovae (SNe), which is a low-luminosity subclass of Type Ia SNe. A nonequilibrium chemical kinetic approach is adopted to trace the synthesis of molecules, molecular ...
  • Machine learning─based identification of the solar disk and plages in Kodaikanal solar observatory historical suncharts 
    Mishra, Dibya Kirti; Chatterjee, Subhamoy; Jha, Bibhuti K; Raju, Hemapriya; Priyadarshi, Aditya; Hegde, M; Routh, Srinjana; Banerjee, D; Khan, M. Saleem (American Astronomical Society, 2026-03)
    Kodaikanal Solar Observatory (KoSO) is one of the oldest solar observatories, possessing an archive of multiwavelength solar observations, including white light, Ca II K, and Hα images spanning over a century. In addition ...
  • ATOMS-QUARKS survey: Inflow and infall in massive Protocluster G318.049+00.086— evidence of competitive accretion 
    Gupta, Shivani; Baug, Tapas; Archana Soam; Liu, Tie; Xu, Feng-Wei; Moharana, Satyajeet; Garay, Guido; Lee, Chang Won; Zhang, Siju; Hoque, Ariful; Porel, Puja; Zhu, Lei; Yang, Dongting; Liu, Hong-Li; Jiao, Wenyu; Liu, Xunchuan; Panja, Alik; Mai, Xiaofeng; Zhang, Yankun; Kim, Shinyoung (American Astronomical Society, 2026-03-10)
    We present a gas kinematic study of the massive protocluster G318.049+00.086. The protocluster is reported to contain 12 prestellar core candidates and four protostellar cores. Filamentary structures are identified using ...

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