IIA Institutional Repository: Recent submissions

  • Radio morphology of gamma-ray sources: Double-lobed radio sources 
    Paliya, Vaidehi S; Saikia, D. J; Dominguez, Alberto; Stalin, C. S (American Astronomical Society, 2024-11-20)
    The extragalactic γ-ray sky is dominated by relativistic jets aligned to the observer's line of sight, i.e., blazars. A few of their misaligned counterparts, e.g., radio galaxies, are also detected with the Fermi-Large ...
  • Spectrophotometric reverberation mapping of intermediate-mass black hole NGC 4395 
    Pandey, Shivangi; Rakshit, S; Chand, Krishan; Stalin, C. S; Cho, Hojin; Woo, Jong-Hak; Jalan, P; Mandal, A. K; Omar, A; Jose, Jincen; Gupta, Archana (American Astronomical Society, 2024-11-20)
    Understanding the origins of massive black hole seeds and their coevolution with their host galaxy requires studying intermediate-mass black holes (IMBHs) and estimating their mass. However, measuring the masses of these ...
  • NGC 7314: X-ray study of the evolving accretion properties 
    Chatterjee, Debjit; Jana, Arghajit; Mangalam, A; Chang, Hsiang-Kuang (American Astronomical Society, 2024-11-20)
    We present a comprehensive analysis of the timing and spectral properties of NGC 7314, a Seyfert 1.9 galaxy, using X-ray observations from XMM-Newton, NuSTAR, and RXTE/proportional counter array (PCA). The timing analysis ...
  • Simultaneous x-ray and optical polarization observations of the blazar Mrk 421 
    Bharathan, Athira M; Stalin, C. S; Sahayanathan, S; Wani, Kiran; Mandal, A. K; Chatterjee, Rwitika; Joshi, Santosh; Pandey, J. C; Mathew, B; Agrawal, V. K (American Astronomical Society, 2024-11-10)
    We present near-simultaneous X-ray and optical polarization measurements in the high synchrotron peaked (HSP) blazar Mrk 421. The X-ray polarimetric observations were carried out using Imaging X-ray Polarimetry Explorer ...
  • The first detection of X-Ray polarization in a newly discovered galactic transient swift J151857.0-572147 
    Mondal, Santanu; Suribhatla, S. Pujitha; Chatterjee, Kaushik; Singh, Chandra B; Chatterjee, Rwitika (American Astronomical Society, 2024-11-10)
    We study the spectropolarimetric properties of a newly discovered black hole (BH) X-ray binary Swift J151857.0-572147 jointly using Imaging X-ray Polarimetry Explorer (IXPE) and NuSTAR observations during 2024 March. The ...
  • Simulating the formation and eruption of flux rope by magneto-friction model driven by time-dependent electric fields 
    Vemareddy, P (American Astronomical Society, 2024-11-10)
    Aiming to capture the formation and eruption of flux ropes (FRs) in the source active regions (ARs), we simulate the coronal magnetic field evolution of the AR 11429 employing the time-dependent magneto-friction model ...
  • Unravelling the asphericities in the explosion and multifaceted circumstellar matter of SN 2023ixf 
    Singh, Avinash; Teja, Rishabh Singh; Moriya, Takashi J; Maeda, K; Kawabata, K. S; Tanaka, Masaomi; Imazawa, Ryo; Nakaoka, Tatsuya; Gangopadhyay, Anjasha; Yamanaka, Masayuki; Swain, Vishwajeet; Sahu, D. K; Anupama, G. C; Kumar, Brajesh; Anche, Ramya M; Sano, Y; Raj, A; Agnihotri, V. K; Bhalerao, Varun; Bisht, D; Bisht, Mohit Singh; Belwal, Kuldeep; Chakrabarti, S. K; Fujii, Mitsugu; Nagayama, Takahiro; Matsumoto, K; Hamada, Taisei; Kawabata, Miho; Kumar, Amit; Kumar, Ravi; Malkan, Brian K; Smith, Paul; Sakagam, Yuta; Taguchi, Kenta; Tominaga, Nozomu; Watanabe, Arata (American Astronomical Society, 2024-11-01)
    We present a detailed investigation of photometric, spectroscopic, and polarimetric observations of the Type II SN 2023ixf. Earlier studies have provided compelling evidence for a delayed shock breakout from a confined ...
  • Asteroseismology of the mild Am δ Sct star HD 118660: TESS photometry and modelling 
    Sarkar, M; Joshi, S; Dupret, M. A; Trust, Otto; De Cat, P; Semenko, E; Lampens, P; Goswami, A; Mkrtichian, David; Karinkuzhi, D; Yakunin, I; Gupta, Archana (Oxford University Press on behalf of Royal Astronomical Society, 2024-11)
    We present the results of an asteroseismic study of HD 118660 (TIC 171729860), being a chemically peculiar (mild Am) star exhibiting δ Scuti (δ Sct) pulsations. It is based on the analysis of two sectors of time-series ...
  • Non-conventional approach for deriving the radial sizes of coronal mass ejections at different instances: discrepancies in the estimates between remote and in situ observations 
    Agarwal, Anjali; Mishra, Wageesh (Oxford University Press on behalf of Royal Astronomical Society, 2024-11)
    Understanding the evolution of radial sizes and instantaneous expansion speeds of coronal mass ejections (CMEs) is crucial for assessing their impact duration on Earth’s environment. We introduce a non-conventional approach ...
  • Laghu Mānasa Vyākhyā – a 17th century astronomy manuscript in Kannaḍa 
    Shylaja, B. S; Punith, R. (Indian Academy of Sciences, 2024-12)
    We have studied two manuscripts as commentaries called Laghu Mānasa Vyākhyā and titled grahaṇānayanam. Our attempts to decipher the contents have revealed that they are commentaries in Sanskrit (the script is Kannada) on ...
  • Exploring the dynamic rotational profile of the hotter solar atmosphere: A multiwavelength approach using SDO/AIA data 
    Routh, Srinjana; Jha, Bibhuti K; Mishra, Dibya Kirti; Doorsselaere, Tom Van; Pant, V; Chatterjee, Subhamoy; Banerjee, D (American Astronomical Society, 2024-11-10)
    Understanding the global rotational profile of the solar atmosphere and its variation is fundamental to uncovering a comprehensive understanding of the dynamics of the solar magnetic field and the extent of coupling between ...
  • Long term CCD photometry of the distant cluster NGC2419: The CMD revisited 
    Arellano Ferro, A; Muneer, S; Giridhar, S; Bustos Fierro, I; Yepez, M. A; Garcia Perez, G. A; Rios Segura, G (Instituto de Astronomıa, Universidad Nacional Autonoma de Mexico, 2024-10)
    Employing VI images of NGC 2419 acquired over 17 years, light curves for most of the known variables in the field of the cluster are produced. A cluster membership analysis for about 3100 stars in the cluster field with ...
  • Helium Abundance of the Sun: A Spectroscopic Analysis 
    Moharana, Satyajeet; Hema, B. P; Pandey, Gajendra (American Astronomical Society, 2024-10-20)
    Determining the He/H ratio in cool stars presents a fundamental astrophysical challenge. While this ratio is established for hot O and B stars, its extrapolation to cool stars remains uncertain due to the absence of helium ...
  • Investigative study of five low mass ratio semi-detached binaries 
    Vinay Kumar, G; Devarapalli, Shanti Priya; Parthasarathy, M; Jagirdar, Rukmini; Stassun, K. G (Springer Nature B.V., 2024-10)
    We present the first pulsation analysis of four totally eclipsing Algol systems S Cnc, SS Cet, TW And, and VW Cyg using the latest data available from Kepler (K2), and TESS databases. Based on the characteristics observed ...
  • Redshifted sodium transient near exoplanet transit 
    Oza, Apurva V; Seidel, Julia V; Hoeijmakers, H. Jens; Unni, Athira; Kesseli, Aurora Y; Schmid, Carl A; Sivarani, T; Bello-Arufe, Aaron; Gebek, Andrea; Moritz Meyer zu, Westram; Sousa, S. G; Lopes, Rosaly M. C; Hu, Renyu; Kleer, Katherine de; Fisher, Chloe; Charnoz, Sebastien; Baker, Ashley D; Halverson, Sam; Schneider, Nick M; Psaridi, Angelica; Wyttenbach, Aurelien; Torres, Santiago; Bhatnagar, Ishita; Johnson, Robert E (American Astronomical Society, 2024-10-01)
    Neutral sodium (Na i) is an alkali metal with a favorable absorption cross section such that tenuous gases are easily illuminated at select transiting exoplanet systems. We examine both the time-averaged and time-series ...
  • Exploring the central region of NGC 1365 in the ultraviolet domain 
    Kurian, K. S; Stalin, C. S; Wylezalek, D; Lyubenova, Mariya; Adhikari, T. P; Devaraj, A; Sagar, R; Kissler-Patig, Markus; Mondal, Santanu (American Astronomical Society, 2024-10-10)
    Active galactic nuclei (AGN) feedback and its impact on their host galaxies are critical to our understanding of galaxy evolution. Here, we present a combined analysis of new high resolution ultraviolet (UV) data from the ...
  • ASIVA – Platform for observational and computational analysis of stellar variables 
    Saleh, P. R; Singh, Tanveer; Hazarika, D; Rajkumari, Surabhi; Rajkumar, Saurabh; Das, Pritam; Parihar, P. S; Saikia, E (Elsevier B.V, 2024-10)
    The astronomical data analysis consists of two crucial process; data reduction of the captured images and data analysis of the derived magnitudes. We present the platform ASIVA, a data analysis platform which comes along ...
  • Detection of a new sample of Galactic white dwarfs in the direction of the Small Magellanic Cloud 
    Sidharth, A. V; Shridharan, B; Mathew, B; Devaraj, A; Cysil, T. B; Stalin, C. S; Arun, R; Bhattacharyya, S; Kartha, S. S; Robin, T (EDP Sciences, 2024-10)
    Aims. In this study, we demonstrate the efficacy of the Ultraviolet Imaging Telescope (UVIT) in identifying and characterizing white dwarfs (WDs) within the Milky Way Galaxy. Methods. Leveraging the UVIT point-source ...
  • SN 2021wvw: a core-collapse supernova at the subluminous, slower, and shorter end of type IIPs 
    Teja, Rishabh Singh; Goldberg, Jared A; Sahu, D. K; Anupama, G. C; Singh, Avinash; Swain, Vishwajeet; Bhalerao, Varun (American Astronomical Society., 2024-10-10)
    We present detailed multiband photometric and spectroscopic observations and analysis of a rare core-collapse supernova, SN 2021wvw, that includes photometric evolution up to 250 days and spectroscopic coverage up to 100 ...
  • Calibration of spectropolarimetry channel of visible emission line coronagraph onboard Aditya-L1 
    Venkata Suresh, Narra; Sasikumar Raja, K; Prasad, B. R; Singh, J; Mishra, Shalabh; Sanal Krishnan, V. U; Bhavana Hegde, S; Utkarsha, D.; Natarajan, V; Pawan Kumar, S; Muthu Priyal, V; Savarimuthu, P; Priya, Gavshinde; Kamath, P. U (Springer Nature, 2024-10)
    The magnetic field strength and its topology play an important role in understanding the formation, evolution, and dynamics of the solar corona. Also, it plays a significant role in addressing long-standing mysteries such ...

Search DSpace

Browse

My Account