IIA Institutional Repository: Recent submissions

  • The Indo-Russian UV Spectrograph Project for the Chinese Space Station (SING) 
    Sachkova, M. E; Bharat Chandra; Shanti Prabha, C; Prakash, Ajin; Binukumar, G; Safonova, M; Rai, Richa; Mohan, Rekhesh; Murthy, J; Shmagin, V. E (Springer Nature, 2021-12)
    The ultraviolet wavelength range (90–300 nm) is one of the most important parts of the electromagnetic spectrum for astrophysicists. The success of the GALEX and ASTROSAT/UVIT missions has given a new view on the ultraviolet ...
  • Spectral Lines in FUV and EUV for Diagnosing Coronal Magnetic Field 
    Raveena, Khan; Nagaraju, K (Springer Nature, 2022-07)
    The diagnostic capabilities of spectral lines in the far-ultraviolet (FUV) and extremeultraviolet (EUV) wavelength ranges are explored in terms of their Hanle and Zeeman sensitivity to probe the vector magnetic fields in ...
  • Searching for a Solar Source of Magnetic-Field Switchbacks in Parker Solar Probe’s First Encounter 
    Pablos, D. de; Samanta, T; Badman, S. T; Schwanitz, C; Harra, L. K; Petrie, G; Mac Cormack, C; Mandrini, C. H; Raouafi, N. E; Martinez Pillet, V; Velli, M (Springer Nature, 2022-07)
    Parker Solar Probe observations show ubiquitous magnetic-field reversals closer to the Sun, often referred to as “switchbacks”. The switchbacks have been observed before in the solar wind near 1 AU and beyond, but their ...
  • Physical conditions and chemical abundances of the variable planetary nebula IC 4997 
    Danehkar, A; Parthasarathy, M (Oxford University Press on behalf of the Royal Astronomical Society, 2022-07)
    The planetary nebula (PN) IC 4997 is one of a few rapidly evolving objects with variable brightness and nebular emission around a hydrogen-deficient star. In this study, we have determined the physical conditions and ...
  • Particle production during inflation: a Bayesian analysis with CMB data from Planck 2018 
    Naik, Suvedha Suresh; Furuuchi, Kazuyuki; Pravabati, C (IOP Publishing, 2022-07)
    A class of inflationary models that involve rapid bursts of particle productions predict observational signatures, such as bump-like features in the primordial scalar power spectrum. In this work, we analyze such models ...
  • Probing TYC 3315-1807-1, An sdB+dM Binary Displaying Strong Period Variation and Reflection Effect 
    Devarapalli, Shanti Priya; Jagirdar, Rukmini; Gundeboina, Vinay Kumar; Thomas, Vineet S; Srinivasa Rao, M (2022-07)
    Subdwarf (sdB) stars include core helium-burning stars with a very thin hydrogen envelope that lies at the blue end of the horizontal branch (or extreme horizontal branch). Among them, short-period sdB binaries especially ...
  • Association between the number of flares in an active region and cumulative flux 
    Suryanarayana, G. S (Elsevier, 2022-07-01)
    Active region (AR) flux is released in the form of flares and Coronal Mass Ejections and a host of several other energetic events. The development of an AR is an indication of the accumulation of flux which reflects the ...
  • Characterizing the Optical Nature of the Blazar S5 1803+784 during Its 2020 Flare 
    Agarwal, A; Pandey, Ashwani; Ozdonmez, Aykut; Ege, Ergun; Avik, Kumar Das; Volkan, Karakulak (IOP Publishing, 2022-07-01)
    We report the results from our study of the blazar S5 1803+784 carried out using quasi-simultaneous B, V, R, and I observations from 2020 May to 2021 July on 122 nights. Our observing campaign detected a historically bright ...
  • The X-shaped Radio Galaxy J0725+5835 is Associated with an AGN Pair 
    Yang, Xiaolong; Ji, Jialu; Joshi, Ravi; Yang, Jun; An, Tao; Wang, Ran; Ho, Luis C; Roberts, David H; Saripalli, Lakshmi (IOP Publishing, 2022-07-01)
    X-shaped radio galaxies (XRGs) are those that exhibit two pairs of unaligned radio lobes (main radio lobes and wings). One of the promising models for the peculiar morphology is jet reorientation. To clarify this, we ...
  • Kinematics and interplanetary characteristics of a halo Coronal Mass Ejection: a multi-wavelength analysis 
    Soni, Shirsh Lata; Ebenezer, E (Springer, 2022-04)
    In this paper, we present the evolution and speed expansion of a shock driven by a Coronal Mass Ejection (CME) that triggered a type II radio. We combine radio analysis with a broad range of observations taken by other ...
  • Probing into emission mechanisms of GRB 190530A using time-resolved spectra and polarization studies: synchrotron origin? 
    Gupta, Rahul; Gupta, S; Chattopadhyay, T; Lipunov, V; Castro-Tirado, A. J; Bhattacharya, D; Pandey, S. B; Oates, S. R; Kumar, Amit; Hu, Y-D; Valeev, A. F; Minaev, P. Yu; Kumar, H; Vinko, J; Dimple; Sharma, V; Aryan, A; Castellon, A; Gabovich, A; Moskvitin, A; Ordasi, A; Pal, A; Pozanenko, A; Zhang, B-B; Kumar, B; Svinkin, D; Saraogi, D; Vlasenko, D; Fernandez-Garcia, E; Gorbovskoy, E; Anupama, G. C; Misra, K; Sarneczky, K; Kriskovics, L; Castro-Tirado, M. A; Caballero-Garcia, M. D; Tiurina, N; Balanutsa, P; Lopez, R. R; Sanchez-Ramirez, R; Szakats, R; Belkin, S; Guziy, S; Iyyani, S; Tiwari, S. N; Vadawale, Santosh V; Sun, T; Bhalerao, V; Kornilov, V; Sokolov, V. V (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)
    Multipulsed GRB 190530A, detected by the Gamma-ray Burst Monitor (GBM) and Large Area Telescope onboard Fermi, is the sixth most fluent GBM burst detected so far. This paper presents the timing, spectral, and polarimetric ...
  • ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions – IX. A pilot study towards IRDC G034.43+00.24 on multi-scale structures and gas kinematics 
    Liu, Hong-Li; Tej, Anandmayee; Liu, Tie; Goldsmith, Paul F; Stutz, Amelia; Juvela, Mika; Qin, Sheng-Li; Xu, Feng-Wei; Bronfman, Leonardo; Evans, Neal J; Saha, Anindya; Issac, Namitha; Tatematsu, Ken’ichi; Wang, Ke; Li, Shanghuo; Zhang, Siju; Baug, Tapas; Dewangan, Lokesh; Wu, Yue-Fang; Zhang, Yong; Lee, Chang Won; Liu, Xun-Chuan; Zhou, Jianwen; Archana Soam (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)
    We present a comprehensive study of the gas kinematics associated with density structures at different spatial scales in the filamentary infrared dark cloud, G034.43+00.24 (G34). This study makes use of the H13CO+ (1–0) ...
  • Spectroscopic Investigation Of Nebular Gas (SING): a dedicated NUV spectrograph to study extended objects from a stable space platform 
    Chandra, B; Sachkov, Mikhail; Shanti Prabha, C; Prakash, A; Nair, B. G; Safonova, M; Rai, R; Mohan, Rekhesh; Murthy, J; Shmagin, Vladimir (SPIE-The International Society for Optical Engineering, 2020-12)
    One of the most exciting parts of the astrophysical spectrum is the ultraviolet, with a greater density of absorption and emission lines than any other part of the electromagnetic spectra. Our primary science objective ...
  • Experimental Validation of a Novel Concept to Reduce Optical Surface Wave Front Errors by Using Deformable Bushes at Opto-Mechanical Interfaces 
    Nagabhushana, S; Prasad, B. R; Nagesh, Suresh; Venkata Suresh, Narra; Sandeep, D. S; Kamath, P. U; Misra, Shalab; Hegde, Bhavana; Utkarsha, D; Sinha, Mrityunjay Kumar; Kathiravan, S; Natarajan, V; Pawan, Kumar; Amit Kumar (World Scientific Publishing, 2022-03)
    One of the major objectives of the optomechanics is to support large optics required for the purpose and also to maintain high dynamic stability in operation. This requirement calls for more number of supports, to support ...
  • Phase Shifts Measured in Evanescent Acoustic Waves above the Solar Photosphere and Their Possible Impacts on Local Helioseismology 
    Zhao, Junwei; Rajaguru, S. P; Chen, Ruizhu (IOP Publishing, 2022-07-01)
    A set of 464 minutes of high-resolution high-cadence observations were acquired for a region near the Sun's disk center using the Interferometric BI-dimensional Spectrometer installed at the Dunn Solar Telescope. Ten sets ...
  • Decoding the X-Ray Flare from MAXI J0709–159 Using Optical Spectroscopy and Multiepoch Photometry 
    Bhattacharyya, Suman; Mathew, Blesson; Ezhikode, Savithri H; Muneer, S; Selvakumar, G; Maheswar, G; Arun, R; Anilkumar, Hema; Banerjee, Gourav; Kumar, S. P; Kartha, Sreeja S; Paul, KT; Velu, C (IOP Publishing, 2022-07-10)
    We present a follow-up study on the recent detection of two X-ray flaring events by MAXI/Gas Slit Camera observations in soft and hard X-rays from MAXI J0709–159 in the direction of HD 54786 (LY CMa), on 2022 January 25. ...
  • MUSSES2020J: The Earliest Discovery of a Fast Blue Ultraluminous Transient at Redshift 1.063 
    Jiang, Ji-an; Yasuda, Naoki; Maeda, Keiichi; Tominaga, Nozomu; Doi, Mamoru; Ivezic, Zeljko; Yoachim, Peter; Uno, Kohki; Moriya, Takashi J; Kumar, Brajesh; Pan, Yen-Chen; Tanaka, Masayuki; Tanaka, Masaomi; Nomoto, Kenichi; Jha, Saurabh W; Ruiz-Lapuente, Pilar; Jones, David; Shigeyama, Toshikazu; Suzuki, Nao; Kokubo, Mitsuru; Furusawa, Hisanori; Miyazaki, Satoshi; Connolly, Andrew J; Sahu, D. K; Anupama, G. C (IOP Publishing, 2022-07-10)
    In this Letter, we report the discovery of an ultraluminous fast-evolving transient in rest-frame UV wavelengths, MUSSES2020J, soon after its occurrence by using the Hyper Suprime-Cam (HSC) mounted on the 8.2 m Subaru ...
  • Host galaxies of ultrastrong Mg II absorbers at z ∼ 0.5 
    Guha, Labanya Kumar; Srianand, Raghunathan; Dutta, Rajeshwari; Joshi, Ravi; Noterdaeme, Pasquier; Petitjean, Patrick (Oxford University Press on behalf of Royal Astronomical Society, 2022-07)
    From a sample of 109 candidate ultrastrong Mg II (USMg II; having rest equivalent width of Mg II, W2796 > 3.0 Å) systems at z = 0.4–0.6, we confirm 27 and identify host galaxies of 20 systems based on associated nebular ...
  • LAMOST J045019.27 + 394758.7, with peculiar abundances of N, Na, V, Zn, is possibly a Sculptor dwarf galaxy escapee 
    Meenakshi, P; Goswami, A; Shejeelammal, J; Sonamben, Mayani; Pawar, Ganesh; Mkrtichian, David; Doddamani, Vijayakumar H; Joshi, Santosh (Oxford University Press on behalf of Royal Astronomical Society, 2022-07)
    We present the results of the high-resolution (R ∼ 60 000) spectroscopic analysis of the star LAMOSTJ045019.27 + 394758.7 (hereafter J045) from the list of carbon stars of LAMOST DR2. From our analysis, we find that J045 ...
  • Globular Cluster UVIT Legacy Survey (GlobULeS) – I. FUV–optical colour–magnitude diagrams for eight globular clusters 
    Sahu, Snehalata; Subramaniam, A; Singh, Gaurav; Yadav, Ramakant; Valcarce, Aldo R; Choudhury, Samyaday; Sharmila Rani; Deepthi, S. Prabhu; Chung, Chul; Cote, Patrick; Leigh, Nathan; Geller, Aaron M; Chatterjee, Sourav; Kameswara Rao, N; Bandyopadhyay, Avrajit; Shara, Michael; Dalessandro, Emanuele; Pandey, G; Postma, Joesph E; Hutchings, John; Simunovic, Mirko; Stetson, Peter B; Sivarani, T; Puzia, Thomas; Sohn, Young-Jong (Oxford University Press on behalf of the Royal Astronomical Society, 2022-07)
    We present the first results of eight globular clusters (GCs) from the AstroSat/UVIT Legacy Survey programme GlobULeS based on the observations carried out in two far-ultraviolet (FUV) filters (F148W and F169M). The ...

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