IIA Institutional Repository: Recent submissions

  • 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 ...
  • Dependence of spicule properties on the magnetic field—Results from magnetohydrodynamics simulations 
    Kesri, Kartav; Dey, Sahel; Chatterjee, Piyali; Erdelyi, Robertus (The American Astronomical Society, 2024-09-20)
    Solar spicules are plasma jets observed in the interface region between the visible solar surface and the corona. At any given time, there is a forest of spicules originating in the chromosphere of the Sun. While various ...
  • An accreting supermassive black hole buried in a faint dwarf galaxy 
    Paswan, Abhishek; Das, Mousumi; Rubinur, K (The American Astronomical Society, 2024-09-10)
    In the last decade, there have been several discoveries of active galactic nuclei (AGN) in dwarf galaxies including an AGN in an ultracompact dwarf galaxy with a black hole mass >106 Me. However, finding a supermassive ...
  • Accretion properties of soft X-Ray transient XTE J1856+053 during its 2023 outburst 
    Chatterjee, Debjit; Jana, A; Chang, Hsiang-Kuang (The American Astronomical Society, 2024-09-01)
    Soft X-ray transients (SXTs) are a subclass of the low-mass X-ray binaries that occasionally show a sudden rise in their soft X-ray luminosity; otherwise, they remain in an extremely faint state. We investigate the accretion ...

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