IIA Institutional Repository: Recent submissions

  • A simplified ab initio treatment of diradicaloid structures produced from stretching and breaking chemical bonds 
    Sinha Ray, Suvonil; Ghosh, A; Shit, Anindita; Chaudhuri, R. K; Chattopadhyay, S (Royal Society of Chemistry Publishing, 2017-09)
    he present investigation reports on the prospect of usi ng state specific multireference perturbation theory (SSMRPT) with an improved virtual orbital complete ac tive space configuration interaction (IVO-CASCI) reference ...
  • The VMC survey – XIV. first results on the look-back time star formation rate tomography of the small magellanic cloud 
    Rubele, S; Girardi, L; Kerber, L; Cioni, Maria-Rosa. L; Piatti, A. E; Zaggia, S; Bekki, K; Bressan, A; Clementini, G; de Grijs, R; Emerson, J. P; Groenewegen, M. A. T; Ivanov, V. D; Marconi, M; Marigo, P; Moretti, Maria-Ida; Ripepi, V; Subramanian, S; Tatton, B. L; Van Loon, J. T (Oxford University Press on behalf of the Royal Astronomical Society, 2015-05-01)
    We analyse deep images from the VISTA survey of the Magellanic Clouds in the YJKs filters, covering 14 deg2 (10 tiles), split into 120 subregions, and comprising the main body and Wing of the Small Magellanic Cloud (SMC). ...
  • Hanle echelle spectrograph: design and performance 
    Sriram, S; Amit Kumar; Arun Surya; Sivarani, T; Giridhar, S; Kathiravan, S; Anand, M. N; Jones, D; Grobler, D; Jakobsson, R; Anantha, Ch; Athira Unni; Angchuk, D; Tsewang, D; Gyalson, T (SPIE-The International Society for Optical Engineering, 2018-07-06)
    Hanle echelle spectrograph (HESP) is a high resolution, bench mounted, fiber-fed spectrograph at visible wavelengths. The instrument was recently installed at the 2m Himalayan Chandra Telescope (HCT), located at Indian ...
  • The high-redshift blazar S5 0836+71: a broadband study 
    Paliya, Vaidehi S (IOP Publishing, 2015-05-01)
    A broadband study of the high-redshift blazar S5 0836+71 (z = 2.172) is presented. Multi-frequency light curves show multiple episodes of X-ray and γ-ray flares, while optical-UV fluxes show little variations. During the ...
  • Late time X-ray, IR and radio observations of the tidal disruption event galaxy NGC 5905 
    Raichur, H; Mousumi Das; Herrero, A. A; Shastri, P; Kantharia, N. G (Springer, 2015-04)
    NGC 5905 is one of the few galaxies with no prior evidence for an active galactic nucleus (AGN) in which an X-ray flare was detected by the ROSAT All Sky Survey (RASS) in 1990–1991. Follow-up studies showed that the X-ray ...
  • Communication: Viewing The Ground And Excited Electronic Structures of Platinum And Its Ion Through The Window of Relativistic Coupled Cluster Method 
    Sinha Ray, Suvonil; Chaudhuri, R. K; Chattopadhyay, S (American Institute of Physics, 2017-07)
    Highly accurate electronic structure calculations are often needed to supplement scant experimental data. We report the ground 3 D 3 and some selected low lying excited/ionized states of Pt and its ions obtained using ...
  • Opto-mechanical assembly and ground calibration of LUCI 
    Mathew, J; Nair, B. G; Sriram, S; Kamath, P. U; Prakash, A; Mayuresh, Sarpotdar; Ambily, S; Nirmal, K; Sreejith, A. G; Safonova, M; Murthy, J; Brosch, N (SPIE--The International Society for Optical Engineering, 2018-08-20)
    The Lunar Ultraviolet Cosmic Imager (LUCI) is an innovative all-spherical mirrors telescope, proposed to fly as a scientific UV imaging payload on a lunar mission in collaboration with Indian Aerospace Company-TeamIndus, ...
  • Kepler Object of Interest Network I. First results combining ground- and space-based observations of Kepler systems with transit timing variations 
    Von Essen, C; Ofir, A; Dreizler, S; Agol, E; Freudenthal, J; Hernández, J; Wedemeyer, S; Parkash, V; Deeg, H. J; Hoyer, S; Morris, B. M; Becker, A. C; Sun, L; Gu, S. H; Herrero, E; Tal-Or, L; Poppenhaeger, K; Mallonn, M; Albrecht, S; Khalafinejad, S; Boumis, P; Delgado-Correal, C; Fabrycky, D. C; Janulis, R; Lalitha, S; Liakos, A; Mikolaitis, S; Moyano D-Angelo, M. L; Sokov, E; Pakstiene, E; Popov, A; Krushinsky, V; Ribas, I; Rodríguez S, M. M; Rusov, S; Sokova, I; Tautvaisiene, G; Wang, X (EDP Sciences, 2018-07)
    During its four years of photometric observations, the Kepler space telescope detected thousands of exoplanets and exoplanet candidates. One of Kepler’s greatest heritages has been the confirmation and characterization of ...
  • Far-infrared study of K giants in the solar neighborhood: connection between Li enrichment and mass-loss 
    Bharat Kumar, Y; Reddy, B. E; Muthumariappan, C; Zhao, G (EDP Sciences, 2015-05)
    Context. A small group of red giant branch (RGB) stars are known to have anomalous Li enhancement whose origin is still not well understood. Some studies have proposed that the Li enhancement in RGB stars is correlated to ...
  • Turbulent Density Fluctuations and Proton Heating Rate in the Solar Wind from 9-20 R 
    Sasikumar Raja, K; Subramanian, P; Ramesh, R; Vourlidas, Angelos; Ingale, M (IOP Publishing, 2017-12)
    We obtain scatter-broadened images of the Crab Nebula at 80 MHz as it transits through the inner solar wind in 2017 and 2016 June. These images are anisotropic, with the major axis oriented perpendicular to the radially ...
  • Photometry and spectroscopy of II Peg, IM Peg and UX Ari 
    Dar, A. A; Parihar, P. S; Malik, M. A (IOP Publishing, 2018-08)
    V band photometry of three RS CVn stars, II Peg, IM Peg and UX Ari, is carried out to study the physical properties of these variables. We verified the significant and regular optical photometric variability to be present ...
  • Breaking the Habit: The Peculiar 2016 Eruption of the Unique Recurrent Nova M31N 2008-12a 
    Henze, M; Darnley, M. J; Williams, S. C; Kato, M; Hachisu, I; Anupama, G. C; Arai, A; Boyd, D; Burke, D; Ciardullo, R; Chinetti, K; Cook, L. M; Cook, M. J; Erdman, P; Gao, X; Harris, B; Hartmann, D. H; Hornoch, K; Chuck Horst, J; Hounsel, R; Husar, D; Itagaki, K; Kabashima, F; Kafka, S; Kaur, A; Kiyota, S; Kojiguchi, N; Kučáková, H; Kuramoto, K; Maehara, H; Mantero, A; Masci, F. J; Matsumoto, K; Naito, H; Ness, J. U; Nishiyama, K; Oksanen, A; Osborne, J. P; Page, K. L; Paunzen, E; Pavana, M; Pickard, R; Prieto-Arranz, J; Rodríguez-Gil, P; Sala, G; Sano, Y; Shafter, A. W; Sugiura, Y; Tan, H; Tordai, T; Vraštil, J; Wagner, R. M; Watanabe, F; Williams, B. F; Bode, M. F; Bruno, A; Buchheim, B; Crawford, T; Goff, B; Hernanz, M; Igarashi, A. S; José, J; Motta, M; O’Brien, T. J; Oswalt, T; Poyner, G; Ribeiro, V. A. R. M; Sabo, R; Shara, M.M; Shears, J; Starkey, D; Starrfield, S; Woodward, C. E (IOP Publishing, 2018-04-10)
    which is the most promising candidate for the single-degenerate progenitor of a Type Ia supernova known to date. The previous three eruptions of M31N 2008-12a have displayed remarkably homogeneous multiwavelength properties: ...
  • On dark matter-dark radiation interaction and cosmic reionization 
    Das, Subinoy; Mondal, Rajesh; Vikram, R; Srikanth, S (IOP Publishing, 2018-08)
    The dark matter sector of our universe can be much richer than the conventional picture of a single weakly interacting cold dark matter particle species. An intriguing possibility is that the dark matter particle interacts ...
  • Temporal Variations of Different Solar Activity Indices through the Solar Cycles 21-23 
    Goker, U. D; Singh, J; Nutku, F; Priyal, M (University of Belgrade, 2017-12)
    SUMMARY: Here, we compare the sunspot counts and the number of sunspot groups (SGs) with variations of total solar irradiance (TSI), magnetic activity, Ca II K-flux, faculae and plage areas. We applied a time series ...
  • Modelling high resolution Echelle spectrographs for calibrations: Hanle Echelle spectrograph, a case study 
    Anantha, Ch; Jones, D; Sivarani, T (Springer, 2015-06)
    We present a modelling scheme that predicts the centroids of spectral line features for a high resolution Echelle spectrograph to a high accuracy. Towards this, a computing scheme is used, whereby any astronomical spectrograph ...
  • The inner coronagraph on board ADITYA-L1 and automatic detection of CMEs 
    Banerjee, D; Ritesh Patel; Pant, V; ADITYA Team (International Astronomical Union, 2017-07)
    Visible Emission Line Coronagraph (VELC) on board ADITYA-L1 is an internally occulted coronagraph with mirror as its primary objective element. It has a field of view (FOV) starting from 1.05 R –3R. It will observe the ...
  • A Low-Frequency Study of Recently Identified Double-Double Radio Galaxies 
    Nandi, S; Saikia, D. J; Roy, R; Dabhade, P.; Wadadekar, Y; Larsson, J; Baes, M; Chandola, H. C; Singh, M (Oxford University Press on behalf of the Royal Astronomical Society, 2019-07)
    n order to understand the possible mechanisms of recurrent jet activity in radio galaxies and quasars, which are still unclear, we have identified such sources with a large range of linear sizes (220–917 kpc), and hence ...
  • Quasi-periodic oscillation of a coronal bright point 
    Samanta, T; Banerjee, D; Tian, H (IOP Publishing, 2015-06-20)
    Coronal bright points (BPs) are small-scale luminous features seen in the solar corona. Quasi-periodic brightenings are frequently observed in the BPs and are generally linked with underlying magnetic flux changes. We study ...
  • Contribution of Proton Capture Reactions to the Ascertained Abundance of Fluorine in the Evolved Stars of Globular Cluster M4, M22, 47 Tuc and NGC 6397 
    Mahanta, Upakul; Goswami, A; Duorah, H. L; Duorah, K (Indian Academy of Sciences, 2017-12)
    The origin of the abundance pattern and also the (anti)correlation present among the elements found in stars of globular clusters (GCs) remains unimproved until date. The proton-capture reactions are presently recognised ...
  • Minkowski tensors in three dimensions: probing the anisotropy generated by redshift space distortion 
    Appleby, S; Pravabati, C; Park, C; Yogendran, K. P; Joby, P. K (IOP Publishing, 2018-08)
    We apply the Minkowski tensor statistics to three-dimensional Gaussian random fields. Minkowski tensors contain information regarding the orientation and shape of excursion sets that is not present in the scalar Minkowski ...

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