IIAP Publications: Recent submissions

  • Polarized line formation in moving atmospheres with partial frequency redistribution and a weak magnetic field 
    Sampoorna, M; Nagendra, K. N (IOP Publishing, 2015-10-10)
    The dynamical state of the solar and stellar atmospheres depends on the macroscopic velocity fields prevailing within them. The presence of such velocity fields in the line formation regions strongly affects the polarized ...
  • Results from the worldwide coma morphology campaign for comet ISON (C/2012 S1) 
    Samarasinha, N. H; Mueller, B. E. A; Knight, M. M; Farnham, T. L; Briol, J; Brosch, N; Caruso, J; Gao, X; Gomez, E; Lister, T; Hergenrother, C; Hoban, S; Prouty, R; Holloway, M; Howes, N; Guido, E; Hui, M. T; Jones, J. H; Penland, T. B; Thomas, S. R; Wyrosdick, J; Kiselev, N; Ivanova, A. V; Kaye, T (Elsevier B.V, 2015-12-01)
    We present the results of a global coma morphology campaign for comet C/2012 S1 (ISON), which was organized to involve both professional and amateur observers. In response to the campaign, many hundreds of images, from ...
  • Dynamics of Subarcsecond Bright Dots in the Transition Region above Sunspots and Their Relation to Penumbral Micro-jets 
    Samanta, T; Tian, H; Banerjee, D; Schanche, N (IOP Publishing, 2017-02-01)
    Plages are the magnetically active chromospheric structures prominently visible in the Ca ii K line (3933.67 Å). A plage may or may not be associated with a sunspot, which is a magnetic structure visible in the solar ...
  • Dark matter density distributions and dark energy constraints on structure formation including MOND 
    Rebecca, L; Arun, K; Sivaram, C (Springer, 2020-09)
    In recent papers, it was shown explicitly that the sizes of gravitationally bound large-scale cosmic structures can be constrained from the requirement that their gravitational binding self-energy density should at least ...
  • MHD Seismology of a loop-like filament tube by observed kink waves 
    Pant, V; Srivastava, A. K; Banerjee, D; Goossens, M; Chen, P.-F; Joshi, N. C; Zhou, Y.-H (IOP Publishing, 2015-10)
    We report and analyze observational evidence of global kink oscillations in a solar filament as observed in Hα by instruments administered by National Solar Observatory (NSO)/Global Oscillation Network Group (GONG). An ...
  • Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies in the Sloan Digital Sky Survey 
    Paliya, Vaidehi S; Ajello, M; Rakshit, S; Amit Kumar; Stalin, C. S; Kaur, A; Hartmann, D (IOP Publishing, 2018-01)
    The detection of signi fi cant γ -ray emission from radio-loud narrow-line Seyfert 1 ( NLSy1s ) galaxies enables us to study jets in environments different than those in blazars. However, due to the small number ...
  • Lowering of asymmetry 
    Pandey, K. K; Hiremath, K. M; Yellaiah, G (Indian Academy of Sciences, 2017-03)
    Asymmetry, a well established fact, can be extracted from various solar atmospheric activity indices. Although asymmetry is being localized within short time scale, it also persists at different time scales. In the present ...
  • Simulation of old open clusters for UVIT on ASTROSAT 
    Sindhu, N; Subramaniam, A; Anu Radha, C (IOP Publishing, 2015-10)
    The Ultra Violet Imaging Telescope (UVIT) is one of the payloads on the first Indian multiwavelength satellite ASTROSAT, which is expected to be launched by the Indian Space Research Organisation (ISRO) in the year 2015. ...
  • A study of acoustic halos in active region NOAA 11330 using multi-height SDO observations 
    Tripathy, S. C; Jain, K; Kholikov, S; Hill, F; Rajaguru, S. P; Cally, P. S (Elsevier B.V, 2018-01)
    We analyze data from the Helioseismic Magnetic Imager (HMI) and the Atmospheric Imaging Assembly (AIA) instruments on board the Solar Dynamics Observatory (SDO) to characterize the spatio-temporal acoustic power distribution ...
  • Separating stars from quasars: machine learning investigation using photometric data 
    Makhija, S; Saha, S; Basak, S; Das, M (Elsevier B.V, 2019-10)
    A problem that lends itself to the application of machine learning is classifying matched sources in the GALEX (Galaxy Evolution Explorer) and SDSS (Sloan Digital Sky Survey) catalogs into stars and quasars based on ...
  • Quasiadiabatic dynamics of ultracold bosonic atoms in a one-dimensional optical superlattice 
    Dhar, A; Rossini, D; Das, B. P (The American Physical Society, 2015-09)
    We study the quasiadiabatic dynamics of a one-dimensional system of ultracold bosonic atoms loaded in an optical superlattice. Focusing on a slow linear variation in time of the superlattice potential, the system is driven ...
  • Components of the diffuse ultraviolet radiation at high latitudes 
    Akshaya, M. S; Murthy, J; Ravichandran, S; Henry, R. C; Overduin, J (Oxford University Press on behalf of the Royal Astronomical Society, 2019-08-08)
    We have used data from the Galaxy Evolution Explorer to study the different components of the diffuse ultraviolet background in the region between the Galactic latitudes 70◦–80◦. We find an offset at zero dust column density ...
  • Permanent electric dipole moments of alkaline-earth-metal monofluorides: Interplay of relativistic and correlation effects 
    Srinivasa Prasannaa, V; Sreerekha, S; Abe, M; Bannur, V. M; Das, B. P (The American Physical Society, 2016-04)
    The interplay of the relativistic and correlation effects in the permanent electric dipole moments of the X 2Σ+ electronic ground states of the alkaline-earth-metal monofluorides (BeF, MgF, CaF, SrF, and BaF) has been ...
  • On the discovery of K I 7699 Å line strength variation during the 1982–1984 eclipse of ε Aurigae 
    Parthasarathy, M (Elsevier B.V, 2017-02)
    The discovery of K I 7699 Å line strength variations during the 1982–1984 eclipse of ε Aurigae is described. The equivalent widths and radial velocities of the K I 7699 Å line derived from spectra obtained during 1981 ...
  • Planetary nebulae with UVIT: Far ultra-violet halo around the Bow Tie nebula (NGC 40) 
    Kameswara Rao, N; Sutaria, F. K; Murthy, J; Sriram, K; Mohan, Rekhesh; Ray, A (EDP Sciences, 2018-01)
    Context. NGC 40 is a planetary nebula with diffuse X-ray emission, suggesting an interaction of the high-speed wind from WC8 cen- tral star (CS) with the nebula. It shows strong C IV 1550 Å emission that cannot be ...
  • A software package for evaluating the performance of a star sensor operation 
    Mayuresh, Sarpotdar; Mathew, J; Sreejith, A. G; Nirmal, K; Ambily, S; Prakash, A; Safonova, M; Murthy, J (Springer, 2017-02)
    We have developed a low-cost off-the-shelf component star sensor (StarSense) for use in minisatellites and CubeSats to determine the attitude of a satellite in orbit. StarSense is an imaging camera with a limiting magnitude ...
  • Mapping distortion of detectors in UVIT onboard astroSat observatory 
    Girish, V; Tandon, S. N; Sriram, S; Amit Kumar; Postma, J (Springer, 2017-02)
    Ultraviolet Imaging Telescope (UVIT) is one of the payloads onboard AstroSat, India’s first multi-wavelength Astronomy mission. UVIT is primarily designed to make high resolution images in wide field, in three wavelength ...
  • Chemical analysis of three barium stars: HD 51959, HD 88035, HD 121447 
    Drisya, K; Goswami, A; Sridhar, N; Masseron, T; Meenakshi, P (Oxford University Press on behalf of the Royal Astronomical Society, 2018-05)
    We present elemental abundance results from high-resolution spectral analysis of three nitrogen-enhanced barium stars. The analysis is based on spectra obtained with the fibre- fed extended range optical spectrograph ...
  • Short-timescale γ -Ray Variability in CTA 102 
    Shukla, A; Mannheim, K; Patel, S. R; Roy, J; Chitnis, V. R; Dorner, D; Rao, A. R; Anupama, G. C; Wendel, C (IOP Publishing, 2018-02)
    The fl at-spectrum radio quasar CTA 102 experienced a prolonged state of enhanced activity across the entire observed electromagnetic spectrum during 2016 – 2017, most pronounced during a major outburst between ...
  • In-orbit performance of UVIT on ASTROSAT 
    Subramaniam, A; Tandon, S. N; Hutchings, J; Ghosh, S. K; George, K; Girish, V; Kamath, P. U; Kathiravan, S; Kumar, Amit; Lancelot, J. P; Mahesh, P (SPIE--The International Society for Optical Engineering, 2016-07)
    We present the in-orbit performance and the first results from the ultra-violet Imaging telescope (UVIT) on ASTROSAT. UVIT consists of two identical 38cm coaligned telescopes, one for the FUV channel (130-180nm) and the ...

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