IIA Institutional Repository: Recent submissions

  • 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 ...
  • Casting light on degeneracies: A comprehensive study of lightcurve variations in microlensing events OGLE-2017-BLG-0103 and OGLE-2017-BLG-0192 
    Shah, Sarang (American Astronomical Society, 2024-10-01)
    This study investigates orbital parallax in gravitational microlensing events, focusing on OGLE-2017-BLG-0103 and OGLE-2017-BLG-0192. For events with timescales ≤60 days, a Jerk-Parallax degeneracy arises due to high Jerk ...
  • Full non-LTE spectral line formation III. The case of a two-level atom with broadened upper level 
    Sampoorna, M; Paletou, F; Bommier, V; Lagache, T (EDP Sciences, 2024-10)
    In the present paper we consider the full nonlocal thermodynamic equilibrium (non-LTE) radiation transfer problem. This formalism allows us to account for deviation from equilibrium distribution of both the radiation field ...
  • Candidate ram-pressure stripped galaxies in six low-redshift clusters revealed from ultraviolet imaging 
    George, K; Poggianti, B. M; Omizzolo, A; Vulcani, B; Cote, P; Postma, J; Smith, R; Jaffe, Y. L; Gullieuszik, M; Moretti, A; Subramaniam, A; Sreekumar, P; Ghosh, S. K; Tandon, S. N; Hutchings, J. B (EDP Sciences, 2024-10)
    The assembly of galaxy clusters is understood to be a hierarchical process with a continuous accretion of galaxies over time, which increases the cluster size and mass. Late-type galaxies that fall into clusters can undergo ...
  • Spectro-polarimetric study to constrain accretion-ejection properties of MCG-5-23-16 using IXPE and NuSTAR observations 
    Mondal, Santanu; Chatterjee, Rwitika; Agrawal, Vivek K; Nandi, Anuj (Published by Cambridge University Press on behalf of Astronomical Society of Australia, 2024-10)
    We conducted a study on the X-ray polarisation properties of MCG-5-23-16 by analysing long-term monitoring data from NuSTAR jointly with IXPE observations made in May and November 2022. The re-analysis of IXPE data gives ...
  • ATOMS: ALMA three-millimetre observations of massive star-forming regions – XVI. Neutral versus ion line widths 
    Zhang, C; Liu, Tie; Ren, Z. Y; Zhu, Feng Yao; Liu, Hongli; Wang, Ke; Wu, J, W; Li, D; Jiao, Sihan; Tatematsu, Kenichi; Juvela, Mika; Lee, C. W; Jiao, Wenyu; Bronfman, Leonardo; Zhou, Jianwen; Xu, Feng Wei; Tej, A; Hwang, Jihye; Archana Soam; Das, Swagat; Chibueze, J. O (Oxford University Press on behalf of Royal Astronomical Society, 2024-10)
    It has been suggested that the line width of ions in molecular clouds is narrower than that of the co-existing neutral particles, which has been interpreted as an indication of the decoupling of neutral turbulence from ...
  • Anatomy of the star formation in a tidally disturbed disk galaxy: NGC 3718 
    Watts, Chandan; Das, Mousumi; Barway, Sudhanshu (American Astronomical Society, 2024-10-20)
    We present a UV, optical, and near-IR study of the star-forming complexes in the nearby peculiar galaxy NGC 3718, using Ultraviolet Imaging telescope, Galaxy Evolution Explorer, Spitzer, and DECam Legacy Survey imaging ...
  • Dust grain properties in extragalactic environment through supernovae dust polarisation observations 
    Singh, Saikhom Pravash; Archana Soam (American Astronomical Society, 2024-09)
    Dust polarisation observations of starlight at multi-wavelengths helps us to find maximum polari6 sation, Pmax and the corresponding wavelength, λmax. This λmax is approximately proportional to 7 average grain size, thereby ...
  • Peering into the heart of the giant molecular cloud G148.24+00.41: A deep near-infrared view of the newly hatched cluster FSR 655 
    Rawat, Vineet; Samal, M. R; Ojha, D. K; Brajesh, Kumar; Sharma, Saurabh; Jose, J; Sagar, R; Yadav, R. K (American Astronomical Society, 2024-09)
    We present a detailed near-infrared study of an embedded cluster located in the hub of the giant molecular cloud G148.24+00.41 of mass ∼105 Me, with the TANSPEC instrument mounted on the 3.6 m Devasthal Optical Telescope. ...
  • UVIT survey of the host galaxies of active galactic nuclei. I. star formation scenarios 
    Nandi, Payel; Stalin, C. S; Dam, Poulomi; Saikia, D. J (The American Astronomical Society, 2024-09-20)
    Circumnuclear star formation (SF) is generally seen in galaxies hosting active galactic nuclei (AGN); however, the connection between the AGN activity and SF in them is less well understood. To explore this connection on ...

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