IIAP Publications: Recent submissions

  • A VLBA-uGMRT search for candidate binary black holes: study of six X-shaped radio galaxies with double-peaked emission lines 
    Sebastian, Biny; Caproni, Anderson; Kharb, Preeti; Nayana, A. J; Ali, Arshi; Rubinur, K; O Dea, Christopher P; Baum, Stefi; Nandi, Sumana (Oxford University Press on behalf of Royal Astronomical Society, 2024-06)
    Identifying methods to discover dual active galactic nucleus (AGN) has proven to be challenging. Several indirect tracers have been explored in the literature, including X/S-shaped radio morphologies and double-peaked (DP) ...
  • Equator to Pole Solar Chromospheric Differential Rotation Using Ca-K Features Derived from Kodaikanal Data 
    Kharayat, Hema; Singh, J; Priyal, M; Ravindra, B (American Astronomical Society, 2024-06-20)
    Differential rotation is one of the basic characteristics of the Sun, and it plays an important role in generating the magnetic fields and its activities. We investigated rotation rate using chromospheric features such ...
  • A 1 bit Raw Voltage-recording System for Dedicated Observations of Transients at Low Radio Frequencies 
    Bane Kshitij, Suhas Trupti; Barve, Indrajit V; Gireesh, G. V. S; Kathiravan, C; Ramesh, R (American Astronomical Society, 2024-06)
    Recently we had reported commissioning of a prototype for pulsar observations at low radio frequencies (<100 MHz) using log-periodic dipole antennas in the Gauribidanur Radio Observatory (≈77°E, 14°N) near Bangalore in ...
  • CMEs evolve in the interplanetary medium to double their predicted geo-effectiveness 
    Soni, Shirsh Lata; Maharana, Anwesha; Guerrero, Antonio; Mishra, Wageesh; Poedts, Stefaan; Thampi, Smitha (EDP Sciences, 2024-06)
    We explore the impact of interactions between coronal mass ejections (CMEs) – known as CME–CME interactions – on Earth using remote-sensing and in situ observations and estimate the amplification of the geo-effectiveness ...
  • An Assessment of Solar Cycle 25 progress through observation of SRBs and associated Geomagnetic Storms 
    Ndacyayisenga, Theogene; Uwamahoro, Jean; Sasikumar Raja, K; Uwamahoro, Jean Claude; Kwisanga, Christian; Monstein, Christian (Elsevier B.V, 2024-06-15)
    Geomagnetic storms are severe aspects of Space Weather. They originate due to solar transient emissions such as coronal mass ejections (CMEs), whose energetic materials propagate in the Interplanetary medium and are coupled ...
  • Revisiting the Dust Torus Size–Luminosity Relation Based on a Uniform Reverberation-mapping Analysis 
    Mandal, Amit Kumar; Woo, Jong-Hak; Wang, Shu; Rakshit, Suvendu; Cho, Hojin; Son, Donghoon; Stalin, C. S (2024-06-20)
    We investigate the torus size–luminosity relation of Type 1 active galactic nuclei (AGNs) based on the reverberation-mapping analysis using the light curves of the optical continuum and the IR continuum obtained with the ...
  • Statistical investigation of decayless oscillations in small-scale coronal loops observed by Solar Orbiter/EUI 
    Shrivastav, Arpit Kumar; Pant, Vaibhav; Berghmans, David; Zhukov, Andrei N; Doorsselaere, Tom Van; Petrova, Elena; Banerjee, D; Lim, Daye; Verbeeck, Cis (EDP Sciences, 2024-05)
    Decayless kink oscillations are omnipresent in the solar atmosphere, and they are a viable candidate for coronal heating. Although there have been extensive studies of decayless oscillations in coronal loops with lengths ...
  • SN 2019nyk: A rapidly declining Type II supernova with early interaction signatures 
    Dastidar, Raya; Pignata, Giuliano; Dukiya, Naveen; Misra, Kuntal; Hiramatsu, Daichi; Silva-Farfan, Javier; Howel, D. Andrew; Bostroem, K. Azalee; Singh, Mridweeka; Gangopadhyay, Anjasha; Kumar, Amit; McCully, Curtis (EDP Sciences, 2024-05)
    We present an optical photometric and spectroscopic analysis of the fast-declining hydrogen-rich Type II supernova (SN) 2019nyk. The light curve properties of SN 2019nyk align well with those of other fast-declining Type ...
  • SolarAccel: FPGA accelerated 2D cross-correlation of digital images: Application to solar adaptive optics 
    Das, Soham; Rao, Nanditha; Phanindra, D. V. S; Sridharan, R (Indian Academy of Sciences, 2024-06)
    The cross-correlation of two-dimensional digital images is fundamental to solar adaptive optics computations. It can be used in a simple tip-tilt correction system to identify the relative shift between consecutive images ...
  • Optical spectroscopy of comets using Hanle Echelle Spectrograph (HESP) 
    Aravind, K; Venkataramani, Kumar; Ganesh, Shashikiran; Surya, Arun; Sivarani, T; Sahu, D. K; Unni, Athira; Bhardwaj, Anil (Oxford University Press on behalf of Royal Astronomical Society, 2024-05)
    Observing the vibrational/rotational lines in a comet’s optical spectrum requires high-resolution spectroscopy, as they are otherwise seen as a blended feature. To achieve this, we have obtained medium and high-resolution ...
  • Measurements of seeing-induced crosstalk in tip–tilt corrected solar polarimetry 
    Mathur, Harsh; Nagaraju, K; Pruthvi, Hemanth; Sagayanathan, K (Optica Publishing Group, 2024-05-20)
    We present measurements of seeing-induced crosstalk using spectropolarimetric observations of sunspots recorded simultaneously in the H α and Ca II 8662 Å lines with the Kodaikanal Tower Tunnel (KTT) telescope. The Kodaikanal ...
  • Effect of aspect ratio on the x-ray attenuation of nanoparticles: A theoretical study 
    Haghighi, R. R; Chatterjee, S; Zarei, F; Jafari, A; Vani, V. C; Pishdad, P; Moshiri, Samira; Akondi, V (Elsevier, 2024-05)
    Purpose: There has been a significant focus on the potential applications of nanoparticle suspensions in the past few decades particularly as targeted contrast agents for specific pathological conditions. However, the ...
  • Comparison between variations in solar UV radiation and sunspot parameters with Mg II daily index as a proxy 
    Chandrika, G; Ravindra, B; Doddamani, Vijay Kumar (Elsevier B.V, 2024-05)
    Solar UV radiation influence the Earth’s climate and upper atmosphere. The UV emission from the Sun modulates with the sunspot cycle with an 11-year periodicity. The variations in UV, EUV, and X-rays emission are significant ...
  • Distribution and recovery phase of geomagnetic storms during solar cycles 23 and 24 
    Mishra, Wageesh; Sahani, Preity Sukla; Khuntia, Soumyaranjan; Chakrabarty, Dibyendu (Oxford University Press on behalf of Royal Astronomical Society, 2024-05)
    Coronal mass ejections (CMEs) and Stream Interaction Regions (SIRs) are the main drivers of intense geomagnetic storms. We study the distribution of geomagnetic storms associated with different drivers during solar cycles ...
  • A comparative study of star-forming dwarf galaxies using the UVIT 
    Amrutha, S; Mousumi Das; Yadav, Jyoti (Oxford University Press on behalf of Royal Astronomical Society, 2024-05)
    We present a far-ultraviolet (FUV) study of 16 star-forming dwarf galaxies (SFDGs) using the Ultra Violet Imaging Telescope. Morphologically, SFDGs are classified as dwarf spirals, dwarf irregulars, and blue compact dwarfs ...
  • Analysis of BMR Tilt from AutoTAB Catalog: Hinting toward the Thin Flux Tube Model? 
    Sreedevi, Anu; Jha, Bibhuti K; Karak, Bidya Binay; Banerjee, D (American Astronomical Society, 2024-05-01)
    One of the intriguing mechanisms of the Sun is the formation of bipolar magnetic regions (BMRs) in the solar convection zone (CZ), which are observed as regions of concentrated magnetic fields of opposite polarity on ...
  • Mining the GALAH Data. I. Study of Five Super Lithium-rich Metal-poor Giants 
    Susmitha, A; Mallick, Anohita; Reddy, B. E (American Astronomical Society, 2024-05-01)
    The presence of a large amount of Li in giants is still a mystery. Most of the super Li-rich (SLR) giants reported in recent studies are in the solar metallicity regime. Here, we study the five metal-poor SLRs from the ...
  • Multiwavelength Observations of Multiple Eruptions of the Recurrent Nova M31N 2008-12a 
    Basu, Judhajeet; Pavana, M; Anupama, G. C; Barway, Sudhanshu; Singh, Kulinder Pal; Swain, Vishwajeet; Srivastav, Shubham; Kumar, Harsh; Bhalerao, Varun; Sonith, L. S; Selvakumar, G (American Astronomical Society, 2024-05-01)
    We report the optical, UV, and soft X-ray observations of the 2017–2022 eruptions of the recurrent nova M31N 2008-12a. We find a cusp feature in the r¢- and i¢-band light curves close to the peak, which could be related ...
  • Exploring NGC 2345: A Comprehensive Study of a Young Open Cluster through Photometric and Kinematic Analysis 
    Belwal, Kuldeep; Bisht, D; Bisht, Mohit Singh; Rangwal, Geeta; Raj, Ashish; Dattatrey, Arvind K; Yadav, R. K. S; Bhatt, B. C (American Astronomical Society, 2024-05-01)
    We conducted a photometric and kinematic analysis of the young open cluster NGC 2345 using CCD UBV data from 2 m Himalayan Chandra Telescope, Gaia Data Release 3, Two Micron All-Sky Survey, and the Photometric All-Sky ...
  • Solar Soft X-ray Irradiance Variability III: Magnetic Field Variations of Coronal X-ray Features 
    Kariyappa, R; Adithya, H. N; Masuda, Satoshi; Kusano, Kanya; Imada, Shinsuke; Zender, Joe; Dame, Luc; DeLuca, Edward; Weber, Mark; Matsumoto, Takuma (Springer Nature B.V., 2024-04)
    The magnetic field changes the radiative output of the Sun and is the main source for all the solar surface features. To study the role of the underlying photospheric magnetic field in relation to emission features observed ...

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