IIA Institutional Repository: Recent submissions

  • Solar-Cycle Characteristics in Kodaikanal Sunspot Area: North-South Asymmetry, Phase Distribution and Gnevyshev Gap 
    Ravindra, B; Chowdhury, Partha; Javaraiah, J (Springer Nature, 2021-01)
    Solar activity is asymmetric in the two hemispheres in almost all cycles. This asymmetry is observed both in cycle amplitude and period. We have used about 90 years of sunspot-area data from the Kodaikanal Solar Observatory ...
  • SN 2020jfo: A Short-plateau Type II Supernova from a Low-mass Progenitor 
    Teja, Rishabh Singh; Singh, A; Sahu, D. K; Anupama, G. C; Kumar, Brajesh; Nayana, A. J (American Astronomical Society, 2022-05-01)
    We present spectroscopic and photometric observations of the Type IIP supernova, SN 2020jfo, in ultraviolet and optical wavelengths. SN 2020jfo occurred in the spiral galaxy M61 (NGC 4303), with eight observed supernovae ...
  • The Hubble tension: change in dark energy or a case for modified gravity? 
    Sivaram, C; Arun, K; Rebecca, Louise (Springer, 2022-03)
    Recently, much controversy has been raised about the cosmological conundrum involving the discrepancy in the value of the Hubble constant as implied by Planck satellite observations of the CMBR in the early Universe and ...
  • Understanding of Li production and its evolution in evolved stars 
    Singh, Raghubar (Indian Institute of Astrophysics, 2021-07)
    Lithium (Li) is susceptible to relatively low temperatures. Hence, Li abundances among red giants are expected to be depleted signi cantly, by a factor of 40-60, from its original value on the main sequence. Assuming A(Li)= ...
  • The MeerKAT Galaxy Cluster Legacy Survey. I. Survey Overview and Highlights 
    Knowles, K; Cotton, W. D; Rudnick, L; Camilo, F; Goedhart, S; Deane, R; Ramatsoku, M; Bietenholz, M. F; Bruggen, M; Button, C; Chen, H; Ranchod, S; Retana-Montenegro, E; Sebokolodi, L; Sikhosana, S. P; Smirnov, O; Cheetham, T; Thorat, K; Venturi, T; Abbott, T. D; Adam, R. M; Kotze, A. G; Adams, G; Aldera, M. A; Bauermeister, E. F; Bennett, T. G. H; Bode, W. A; Botha, D. H; de Villiers, D. I. L; Botha, A. G; Dikgale-Mahlakoana, M. A; du Toit, L. J; Kriek, N; Esterhuyse, S. W. P; Fadana, G; Fanaroff, B. L; Manley, J. R; Fataar, S; Foley, A. R; Fourie, D. J; Frank, B. S; Gamatham, R. R. G; Gatsi, T. G; Kriel, H; Geyer, M; Gouws, M; Gumede, S. C; Heywood, I; Marais, S. J; Hlakola, M. J; Hokwana, A; Hoosen, S. W; Horn, D. M; Horrell, J. M. G; Krishnan, V. K; Hugo, B. V; Isaacson, A. R; Jonas, J. L; Jordaan, J. D. B; Joubert, A. F; Maree, M. D. J; Julie, R. P. M; Kapp, F. B; Kasper, V. A; Kenyon, J. S; Kusel, T. W; Kotze, P. P. A; Martens, A; Legodi, L. S; Lehmensiek, R; Liebenberg, D; Lord, R. T; Taljaard, B; Lunsky, B. M; Madisa, K; Magnus, L. G; Main, J. P. L; Makhaba, A; Makhathini, S; Mauch, T; Malan, J. A; McAlpine, K; Merry, B. C; Tasse, C; Millenaar, R. P; Mokone, O. J; Monama, T. E; Chibueze, J. O; Mphego, M. C; New, W. S; Ngcebetsha, B; Ngoasheng, K. J; Ockards, M. T; Otto, A. J; Tiplady, A. J; Patel, A. A; Peens-Hough, A; Perkins, S. J; Ramanujam, N. M; Clarke, T. E; Ramudzuli, Z. R; Ratcliffe, S. M; Renil, R; Robyntjies, A; Rust, A. N; Toruvanda, O; Salie, S; Sambu, N; Schollar, C. T. G; Schwardt, L. C; Schwartz, R. L; Gasperin, F. de; Serylak, M; Siebrits, R; Sirothia, S. K; Slabber, M; Twum, S. N; Sofeya, L; Ianjamasimanana, R; van Balla, T. J; van der Byl, A; van der Merw, C; van Dy, C. L; Brederode, L. R. S; Van Tonder, V; Van Wyk, R; Venter, A. J; Venter, M; Welz, M. G; William, L. P; Jozsa, G. I. G; Xaia, B; Hilton, M; Kesebonye, K. C; Buchner, S; Kolokythas, K; Kraan-Korteweg, R. C; Lawrie, G; Lochner, M; Loubser, S. I; Marchegiani, P; Mhlahlo, N; Moodley, K; Murphy, E; Namumba, B; Burger, J. P; Oozeer, N; Parekh, V; Pillay, D. S; Passmoo, S. S; Ramaila, A. J. T (EDP Sciences, 2022-01)
    MeerKAT’s large number (64) of 13.5 m diameter antennas, spanning 8 km with a densely packed 1 km core, create a powerful instrument for wide-area surveys, with high sensitivity over a wide range of angular scales. The ...
  • Hidden in plain sight: UVIT and MUSE discovery of a large, diffuse star-forming galaxy 
    Yadav, Jyoti; Mousumi Das; Barway, Sudhanshu; Combes, Francoise (EDP Sciences, 2022-01)
    We report the discovery of a nearby large, diffuse galaxy that shows star formation using Ultra Violet Imaging Telescope (UVIT) far-UV observations and archival optical data from Multi-Unit Spectroscopic Explorer (MUSE), ...
  • Solar coronal magnetic fields and sensitivity requirements for spectropolarimetry channel of VELC onboard Aditya-L1 
    Sasikumar Raja, K; Venkata Suresh, Narra; Singh, J; Prasad, B. R (Elsevier, 2022-01-01)
    Understanding solar coronal magnetic fields is crucial to address the long-standing mysteries of the solar corona and solar wind. Although routine photospheric magnetic fields (MFs) are available for decades, coronal MFs ...
  • Investigation of two coronal mass ejections from circular ribbon source region:Origin, Sun-Earth propagation and Geoeffectiveness 
    Syed Ibrahim, M; Uddin, Wahab; Joshi, Bhuwan; Chandra, Ramesh; Awasthi, Arun Kumar (IOP Publishing, 2022-01)
    In this article, we compare the properties of two coronal mass ejections (CMEs) that show similar source region characteristics but different evolutionary behaviors in the later phases. We discuss the two events in terms ...
  • The effect of dark matter halo shape on bar buckling and boxy/peanut bulges 
    Ankit Kumar; Mousumi Das; Kataria, Sandeep Kumar (Oxford University Press on behalf of Royal Astronomical Society, 2022-01)
    It is well established that bars evolve significantly after they form in galaxy discs, often changing shape both in and out of the disc plane. In some cases they may bend or buckle out of the disc plane resulting in the ...
  • Analysis of Solar Hemispheric Chromosphere Properties using the Kodaikanal Observatory Ca–K Index 
    Chowdhury, Partha; Ravindra, B; Bertello, Luca; Pevtsov, Alexei A (IOP Publishing, 2022-01-20)
    The Kodaikanal Observatory has provided long-term synoptic observations of chromospheric activities in the Ca ii K line (393.34 nm) since 1907. This article investigates temporal and periodic variations of the hemispheric ...
  • Investigation of Rocket Effect in BRC 18 using Gaia EDR3 
    Saha, Piyali; Maheswar, G; Ojha, D. K; Neha, Sharma (Oxford University Press on behalf of Royal Astronomical Society, 2022-02)
    Bright-rimmed clouds (BRCs) are ideal candidates to study radiation-driven implosion mode of star formation as they are potential sites of triggered star formation, located at the edges of HII regions, showing evidence ...
  • Multiwavelength study of the gravitationally lensed blazar QSO B0218+357 between 2016 and 2020 
    Acciari, V A; Ansoldi, S; Antonelli, L A; Engels, A Arbet; Artero, M; Asano, K; Baack, D; Babic, A; Baquero, A; Almeida, U Barres de; Barrio, J A; Sahakyan, N; Saito, T; Sakurai, S; Satalecka, K; Saturni, F G; Bernardos, M; Schleicher, B; Schmidt, K; Schweizer, T; Will, M; Green, D; Sitarek, J; Šnidarić, I; Sobczynska, D; Spolon, A; Stamerra, A; Strom, D; Strzys, M; Berti, A; Suda, Y; Surić, T; Hadasch, D; Bhattacharyya, W; Takahashi, M; Tavecchio, F; Temnikov, P; Terzić, T; Teshima, M; Tosti, L; Truzzi, S; Tutone, A; Besenrieder, J; Hahn, A; Ubach, S; López-Oramas, A; Wunderlich, C; Zarić, D; de Palma, F; D’Ammando, F; Barnacka, A; Sahu, D K; Hodges, M; Hovatta, T; Heckmann, L; Kiehlmann, S; Max-Moerbeck, W; Loporchio, S; Bigongiari, C; Readhead, A C S; Reeves, R; Pearson, T J; Lähteenmäki, A; Björklund, I; Tornikoski, M; Herrera, J; Tammi, J; Suutarinen, S; Hada, K; Fraga, B Machado de Oliveira; Niinuma, K; Biland, A; Blanch, O; Bonnoli, G; Bosnjak, Z; Busetto, G; Hoang, J; Carosi, R; Ceribella, G; Cerruti, M; Chai, Y; Maggio, C; Chilingarian, A; Cikota, S; Colak, S M; Colombo, E; Contreras, J L; Hrupec, D; Cortina, J; Covino, S; D’Amico, G; D’Elia, V; Da Vela, P; Majumdar, P; Dazzi, F; De Angelis, A; De Lotto, B; Delfino, M; Hütten, M; Delgado, J; Mendez, C Delgado; Depaoli, D; Pierro, F Di; Venere, L Di; Espiñeira, E Do Souto; Makariev, M; Prester, D Dominis; Donini, A; Dorner, D; Inada, T; Doro, M; Elsaesser, D; Ramazani, V Fallah; Fattorini, A; Ferrara, G; Fonseca, M V; Font, L; Mallamaci, M; Fruck, C; Fukami, S; Manganaro, M; López, R J García; Garczarczyk, M; Gasparyan, S; Gaug, M; Giglietto, N; Giordano, F; Gliwny, P; Godinović, N; Maneva, G; Green, J G; Scherpenberg, J van; Inoue, S; Ishio, K; Iwamura, Y; Jiménez, I; Jormanainen, J; Jouvin, L; Kajiwara, Y; Karjalainen, M; Kerszberg, D; Kobayashi, Y; Vanzo, G; Mannheim, K; Kubo, H; Kushida, J; Lamastra, A; Lelas, D; Leone, F; Lindfors, E; Lombardi, S; Longo, F; López-Coto, R; Vazquez Acosta, M; López-Moya, M; Batkovic, I; Maraschi, L; Mariotti, M; Martínez, M; Mazin, D; Menchiari, S; Mender, S; Mićanović, S; Miceli, D; Ventura, S; Miener, T; Minev, M; Gonzalez, J Becerra; Miranda, J M; Mirzoyan, R; Molina, E; Moralejo, A; Morcuende, D; Moreno, V; Moretti, E; Verguilo, V; Neustroev, V; Nigro, C; Nilsson, K; Bednarek, W; Nishijima, K; Noda, K; Nozaki, S; Ohtani, Y; Oka, T; Otero-Santos, J; Vigorito, C F; Paiano, S; Palatiello, M; Paneque, D; Paoletti, R; Bellizzi, L; Paredes, J M; Pavletić, L; Peñil, P; Perennes, C; Persic, M; Vitale, V; Moroni, P G Prada; Prandini, E; Priyadarshi, C; Puljak, I; Rhode, W; Bernardini, E; Ribó, M; Rico, J; Righi, C; Rugliancich, A; Vovk, I; Saha, L (Oxford University Press on behalf of Royal Astronomical Society, 2022-02)
    We report multiwavelength observations of the gravitationally lensed blazar QSO B0218+357 in 2016–2020. Optical, X-ray, and GeV flares were detected. The contemporaneous MAGIC observations do not show significant very high ...
  • Modeling a Coronal Mass Ejection as a Magnetized Structure with EUHFORIA 
    Sindhuja, G; Singh, J; Asvestari, E; Prasad, B. R (IOP Publishing, 2022-01-20)
    We studied an Earth-directed coronal mass ejection (CME) that erupted on 2015 March 15. Our aim was to model the CME flux rope as a magnetized structure using the European Heliospheric Forecasting Information Asset (EUHFORIA). ...
  • The peculiar abundances of HE 1005–1439 A carbon-enhanced extremely metal-poor star contaminated with products of both s- and i-process nucleosynthesis 
    Goswami, P. P; Goswami, A (EDP Sciences, 2022-01)
    Context. Understanding the surface chemical composition of carbon-enhanced metal-poor (CEMP) stars with enhanced abundances of heavy elements remains problematic. Aims. One of the primary objectives is to investigate the ...
  • An approximate superposition method to obtain a planet's orbit 
    Iyer, Abhinav G; Bhatnagar, Siddharth; Vyasanakere, Jayanth P; Murthy, J (IOP Publishing, 2022-01)
    We demonstrate that the deviation produced by one celestial object on the Keplerian orbit of another around the Sun is largely independent of the presence of the remaining ones. Hence, to calculate the net deviation of ...
  • Spectral Analysis of Solar Radio Type III Bursts from 20 kHz to 410 MHz 
    Sasikumar Raja, K; Maksimovic, Milan; Kontar, Eduard P; Bonnin, Xavier; Zarka, Philippe; Lamy, Laurent; Reid, Hamish; Vilmer, Nicole; Lecacheux, Alain; Krupar, Vratislav (IOP Publishing, 2022-01-10)
    We present the statistical analysis of the spectral response of solar radio type III bursts over the wide frequency range between 20 kHz and 410 MHz. For this purpose, we have used observations that were carried out using ...
  • Solar cycle variations of the EUV network characteristics from SDO/AIA 
    Varghese, Bilin Susan; Raju, K. P; Kurian, P. J; Paul, Issac (Springer Nature, 2022-01)
    It is well-known that there is a close relationship between the supergranules, magnetic field and the Extreme-UltraViolet (EUV) network of the solar atmosphere. We have obtained the network characteristics from the imaging ...
  • X-ray confirmation of the intermediate polar IGR J16547-1916 
    Joshi, A; Wang, W; Pandey, J. C; Singh, K. P; Naik, S; Raj, A; Anupama, G. C; Rawat, N (EDP Sciences, 2022-01)
    Using X-ray observations from the NuSTAR and Swift satellites, we present temporal and spectral properties of an intermediate polar (IP) IGR J16547-1916. A persistent X-ray period at ∼546 s confirming the optical spin ...
  • Deciphering Solar Magnetic Activity: 140 Years of the ‘Extended Solar Cycle’ – Mapping the Hale Cycle 
    McIntosh, Scott W; Leamon, Robert J; Egeland, Ricky; Dikpati, Mausumi; Altrock, Richard C; Banerjee, D; Chatterjee, Subhamoy; Srivastava, Abhishek K; Velli, Marco (Springer, 2021-12)
    We investigate the occurrence of the “extended solar cycle” (ESC) as it occurs in a host of observational data spanning 140 years. Investigating coronal, chromospheric, photospheric, and interior diagnostics, we develop ...
  • Pluto's Atmosphere in Plateau Phase Since 2015 from a Stellar Occultation at Devasthal 
    Sicardy, Bruno; Nagarhalli M, Ashok; Tej, Anandmayee; Pawar, Ganesh; Deshmukh, Shishir; Deshpande, Ameya; Sharma, Saurabh; Desmars, Josselin; Assafin, Marcelo; Ortiz, Jose Luis; Benedetti-Rossi, Gustavo; Braga-Ribas, Felipe; Vieira-Martins, Roberto; Santos-Sanz, Pablo; Chand, Krishan; Bhatt, B. C (IOP Publishing, 2021-12-20)
    A stellar occultation by Pluto was observed on 2020 June 6 with the 1.3 m and 3.6 m telescopes located at Devasthal, Nainital, India, using imaging systems in the I and H bands, respectively. From this event, we derive ...

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