IIA Institutional Repository: Recent submissions

  • Intranight optical variability of blazars and radio-quiet quasars using the ZTF survey 
    Negi, Vibhore; Gopal-Krishna; Joshi, Ravi; Chand, Hum; Wiita, Paul J; Navaneeth, P. K; Singh, Ravi S (Oxford University Press on behalf of Royal Astronomical Society, 2023-07)
    We explore the potential of the ongoing Zwicky Transient Facility (ZTF) survey for studying intranight optical variability (INOV) of active galactic nuclei (AGNs), in particular for picking rare events of large INOV ...
  • Preparing for solar and heliospheric science with the SKAO: An Indian perspective 
    Oberoi, Divya; Bisoi, Susanta Kumar; Sasikumar Raja, K; Kansabanik, Devojyoti; Mohan, Atul; Mondal, Surajit; Sharma, Rohit (Indian Academy of Sciences, 2023-06)
    The Square Kilometre Array Observatory (SKAO) is perhaps the most ambitious radio telescope envisaged yet. It will enable unprecedented studies of the Sun, corona and heliosphere and help to answer many of the outstanding ...
  • High-resolution Observations of HI in the IC 63 Reflection Nebula 
    Bonne, Lars; Andersson, B-G; Minchin, Robert; Archana Soam; Yaldaei, Joshua; Kulas, Kristin; Karoly, Janik; Knee, Lewis B. G; Kumar, Siddharth; Roy, Nirupam (American Astronomical Society, 2023-06-01)
    Photodissociation regions (PDRs), where the (far-)ultraviolet light from hot young stars interact with the gas in surrounding molecular clouds, provide laboratories for understanding the nature and role of feedback by ...
  • A physically-motivated perspective of Fanaroff–Riley classification of radio galaxies 
    Gopal-Krishna; Wiita, Paul J; Joshi, Ravi; Patra, Dusmanta (Indian Academy of Sciences, 2023-06)
    A small subset of extragalactic double radio sources, termed HYbrid MOrpholgy Radio Sources (HYMORS), is distinguished by a very unusual, hybrid morphology in terms of Fanaroff–Riley (FR) classification. In HYMORS, one ...
  • Fullerenes in the circumstellar medium of Herbig Ae/Be stars: insights from the Spitzer mid-infrared spectral catalog 
    Arun, R; Mathew, Blesson; Manoj, P; Maheswar, G; Shridharan, B; Kartha, Sreeja S; Narang, Mayank (Oxford University Press on behalf of Royal Astronomical Society, 2023-08)
    This study presents the largest mid-infrared spectral catalogue of Herbig Ae/Be stars to date, containing the Spitzer Infrared Spectrograph spectra of 126 stars. Based on the catalogue analysis, two prominent infrared ...
  • GlobULeS – V. UVIT/AstroSat studies of stellar populations in NGC 362: detection of blue lurkers in a globular cluster 
    Dattatrey, Arvind K; Yadav, R. K. S; Kumawat, Gourav; Sharmila Rani; Singh, Gaurav; Subramaniam, A; Singh, Ravi S (Oxford University Press on behalf of Royal Astronomical Society, 2023-07)
    We report the discovery of four blue lurkers with low- and extremely low mass white dwarf (ELM WD) companions in the Galactic globular cluster NGC 362 using AstroSat’s Ultra Violet Imaging Telescope (UVIT). We analysed ...
  • Investigating kinematics and dynamics of three open clusters towards Galactic anticentre 
    Rangwal, Geeta; Yadav, R. K. S; Bisht, D; Durgapal, Alok; Sariya, Devesh P (Oxford University Press on behalf of Royal Astronomical Society, 2023-08)
    We present the intracluster kinematics and dynamics of three open clusters: NGC 1193, NGC 2355, and King 12 by incorporating kinematical and photometric data from Gaia DR3, as well as a ground-based telescope. After ...
  • A study of the propagation of magnetoacoustic waves in small-scale magnetic fields using solar photospheric and chromospheric Dopplergrams: HMI/SDO and MAST observations 
    Kumar, Hirdesh; Kumar, Brajesh; Rajaguru, S. P; Mathew, Shibu K; Bayanna, Ankala Raja (Elsevier, 2023-06)
    In this work, we present a study of the propagation of low-frequency magneto-acoustic waves into the solar chromosphere within small-scale inclined magnetic fields over a quiet-magnetic network region utilizing nearsimultaneous ...
  • The Carbon Star DY Persei May Be a Cool R Coronae Borealis Variable 
    Garcia-Hernandez, D. A; Kameswara Rao, N; Lambert, David L; Eriksson, K; Reddy, A. B. S; Masseron, Thomas (American Astronomical Society, 2023-05-01)
    Optical and near-IR photometry suggests that the carbon star DY Persei exhibits fadings similar to those of R Coronae Borealis (RCB) variables. Photometric surveys of the Galaxy and Magellanic Clouds uncovered new DY Per ...
  • Broadband X-Ray Spectral Analysis of the ULX NGC 1313 X-1 Using JeTCAF: Origin of the ULX Bubble 
    Palit, Biswaraj; Mondal, Santanu (IOP Publishing, 2023-05)
    NGC 1313 X-1 is a mysterious ultraluminous X-ray (ULX) source whose X-ray-powering mechanism and bubblelike structure surrounding the source are topics of intense study. Here, we perform an X-ray spectroscopic study of the ...
  • The Possible Cause of Most Intense Geomagnetic Superstorm of the 21st Century on 20 November 2003 
    Raghav, Anil; Shaikh, Zubair; Vemareddy, P; Bhaskar, Ankush; Dhamane, Omkar; Ghag, Kalpesh; Tari, Prathmesh; Dayanandan, Baiju; Mohammed Al Suti, Badar (Springer, 2023-05)
    An extreme geomagnetic storm has the potential to affect various technologies and activities in space and on the ground, e.g., power grids, oil and gas industries, communications, ground transportation, satellite ...
  • Infrared polarisation study of Lynds 1340: A case of RNO 8 
    Rai, Archita; Ganesh, Shashikiran (Indian Academy of Sciences, 2023-06)
    This paper describes the polarisation study of a Lynds cloud, LDN 1340, α = 2h32m and δ = 73◦00 corresponding to galactic coordinates of = 130◦.07 and b = 11◦.6, with emphasis on the RNO 8 area. The cloud has been ...
  • Spectral and temporal studies of Swift J1658.2–4242 using AstroSat observations with the JeTCAF model 
    Mondal, Santanu; Jithesh, V (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    We present the X-ray spectral and temporal analysis of the black hole X-ray transient Swift J1658.2–4242 observed by AstroSat. Three epochs of data have been analysed using the JeTCAF model to estimate the mass accretion ...
  • Stability of galaxies across morphological sequence 
    Aditya, K (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    We investigate the stability of nearby disc galaxies and galaxies at redshift (z) equal to 4.5. We explore the connection between the stability parameter (QRW), star formation rate (SFR), gas fraction (f Gas), and the ...
  • uGMRT observations of the hot-Saturn WASP-69b: Radio-Loud Exoplanet–Exomoon Survey II (RLEES II) 
    Narang, Mayank; Oza, Apurva V; Hakim, Kaustubh; Manoj, P; Tyagi, Himanshu; Banerjee, Bihan; Surya, Arun; Nayak, Prasanta K; Banyal, R. K; Thorngren, Daniel P (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    Exomoons have so far eluded ongoing searches. Several studies have exploited transit and transit timing variations and highresolution spectroscopy to identify potential exomoon candidates. One method of detecting and ...
  • Type Ia supernovae SN 2013bz, PSN J0910 + 5003, and ASASSN-16ex: similar to 09dc-like? 
    Tiwari, S; Chakradhari, N. K; Sahu, D. K; Anupama, G. C; Kumar, B; Sahu, K. R (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    We present optical photometric and spectroscopic studies of three supernovae (SNe): SN 2013bz, PSN J0910 + 5003, and ASASSN-16ex (SN 2016ccj). UV–optical photometric data of ASASSN-16ex obtained with the Swift ...
  • Exploring diffuse radio emission in galaxy clusters and groups with uGMRT and SKA 
    Paul, Surajit; Kale, Ruta; Basu, Aritra; Sur, Sharanya; Parekh, Viral; Gupta, Prateek; Chatterjee, Swarna; Salunkhe, Sameer; Iqbal, Asif; Pandey-Pommier, Mamta; Raja, Ramij; Rahaman, Majidul; Raychaudhury, Somak; Nath, Biman B; Majumdar, Subhabrata (Indian Academy of Sciences, 2023-06)
    Diffuse radio emission has been detected in a considerable number of galaxy clusters and groups, revealing the presence of pervasive cosmic magnetic fields, and of relativistic particles in the large scale structure of the ...
  • Propagation of coronal mass ejections from the Sun to the Earth 
    Mishra, Wageesh; Teriaca, Luca (Indian Academy of Sciences, 2023-06)
    Coronal mass ejections (CMEs), as they can inject a large amounts of mass and magnetic flux into the interplanetary space, are the primary source of space weather phenomena on the Earth. The present review first briefly ...
  • Particle production during inflation: constraints expected from redshifted 21 cm observations from the epoch of reionization 
    Naik, Suvedha Suresh; Pravabati, C; Furuuchi, Kazuyuki (IOP Publishing, 2023-04)
    We examine a type of feature in the primordial scalar power spectrum, namely, the bump-like feature(s) that arise as a result of burst(s) of particle production during inflation. The latest CMB observations by Planck ...
  • Comparison Between Radio Loud and Radio Quiet Fast CMEs: A Reason for Radio Quietness 
    Syed Ibrahim, M; Ebenezer, E; Shanmugaraju, A (Springer, 2023-04)
    It is well known that fast CMEs are mostly associated with magnetohydrodynamic (MHD) shocks in the solar corona, forming type-II radio bursts. However, the absence of type-II radio bursts is not uncommon. Herein, we aim ...

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