IIA Institutional Repository: Recent submissions

  • Galaxy outflows without supernovae 
    Sur, Sharanya; Scannapieco, E; Ostriker, E. C (IOP Publishing, 2016-02)
    High surface density, rapidly star-forming galaxies are observed to have ≈ 50 – 100 km s − 1 line of sight velocity dispersions, which are much higher than expected from supernova driving alone, but may arise from ...
  • Constraining the solar coronal magnetic field strength using split-band type ii radio burst observations 
    Kishore, P; Ramesh, R; Hariharan, K; Kathiravan, C; Gopalswamy, N (IOP Publishing, 2016-11-20)
    We report on low-frequency radio (85–35 MHz) spectral observations of four different type II radio bursts, which exhibited fundamental-harmonic emission and split-band structure. Each of the bursts was found to be closely ...
  • Observations of oppositely directed umbral wavefronts rotating in sunspots obtained from the New Solar Telescope of BBSO 
    Su, J. T; Ji, K. F; Cao, W; Banerjee, D; Priya, T. G; Zhao, J. S; Bai, X. Y; Chen, J; Zhang, M; Ji, H. S (IOP Publishing, 2016-02)
    We study the umbral waves as observed by chromospheric imaging observations of two sunspots with the New Solar Telescope at the Big Bear Solar Observatory. We find that the wavefronts (WFs) rotate clockwise and form ...
  • Can the long-term hemispheric asymmetry of solar activity result from fluctuations in dynamo parameters? 
    Nepomnyashchikh, A; Mandal, Sudip; Banerjee, D; Kitchatinov, Leonid (EDP Sciences, 2019-05)
    Context. The hemispheric asymmetry of sunspot activity observed possesses a regular component varying on a timescale of several solar cycles whose origin and properties are currently debated. Aims This paper addresses ...
  • Primordial planets predominantly of dark Matter 
    Sivaram, C; Arun, K; Kiren, O. V (Springer, 2019-05)
    Cosmic structure formation is thought to occur as a bottom-up scenario, i.e. the lightest objects would have formed first. It has been suggested that the earliest structures to form could have been primordial planets. Here ...
  • On the usefulness of existing solar wind models for pulsar timing corrections 
    Tiburzi, C; Verbiest, J. P. W; Shaifullah, G. M; Janssen, G. H; Anderson, J. M; Horneffer, A; Kunsemoller, J; Ostowski, S; Donner, J. Y; Kramer, M; Anshu Kumari; Porayko, N. K; Zucca, P; Ciardi, B; Dettmar, R.J; Griebmeier, J.M; Hoeft, M; Serylak, M (Oxford University Press on behalf of the Royal Astronomical Society, 2019-07)
    Dispersive delays due to the solar wind introduce excess noise in high-precision pulsar timing experiments, and must be removed in order to achieve the accuracy needed to detect, e.g., low-frequency gravitational waves. ...
  • Chemical analysis of CH stars – III. Atmospheric parameters and elemental abundances 
    Meenakshi, P; Goswami, A; Goswami, P. P; Shejeelammal, J; Masseron, T (Oxford University Press on behalf of the Royal Astronomical Society, 2019-07)
    Elemental abundances of CH stars can provide observational constraints for theoretical studies on the nucleosynthesis and evolution of low- and intermediate-mass stars. However, available abundance data in literature are ...
  • Polarized line formation in spherically symmetric atmospheres with velocity fields 
    Megha, A; Sampoorna, M; Nagendra, K. N; Anusha, L. S; Sankarasubramanian, K (IOP Publishing, 2019-07-01)
    The plane–parallel approximation of the stellar atmospheres cannot be applied to model the formation of optically thick lines formed in extended atmospheres. To a good approximation these atmospheres can be represented by ...
  • SN 2018hna: 1987A-like supernova with a signature of shock breakout 
    Singh, A; Sahu, D. K; Anupama, G. C; Brajesh Kumar; Harsh Kumar; Yamanaka, Masayuki; Baklanov, Petr V; Tominaga, Nozomu; Blinnikov, Sergei. I; Maeda, Keiichi; Anirban, D; Bhalerao, Varun; Ramya, M. Anche; Barway, Sudhanshu; Akitaya, Hiroshi; Nakaoka, Tatsuya; Kawabata, Miho; Kawabata, Koji. S; Sasada, Mahito; Takagi, Kengo; Maehara, Hiroyuki; Isogai, Keisuke; Kino, Masaru; Taguchi, Kenta; Nagao, Takashi (IOP Publishing, 2019-09-10)
    High-cadence ultraviolet, optical, and near-infrared photometric and low-resolution spectroscopic observations of the peculiar Type II supernova (SN) 2018hna are presented. The early-phase multiband light curves (LCs) ...
  • Bibliometric analysis of CSIR-CECRI research publications during 2010 -2015 
    Senthil Kumar, N; Radhakrishnan, N; Hadimani, Nagesh; Prabahar, P (Journal of Advances in Library and Information Science, 2018-01)
    Bibliometrics is one of the techniques to analyze the quantitative literature and can be applied to research articles published in national, international journals on related articles. This paper deals with the bibliometric ...
  • On the long-cycle variability of the Algol OGLE-LMC-DPV-065 and its stellar, orbital, and disc parameters 
    Mennickent, R. E; Cabezas, M; Djurasevic, G; Rivinius, T; Hadrava, P; Poleski, R; Soszynski, I; Celedon, L; Astudillo-Defru, N; Raj, A; Fernandez-Trincado, J. G; Schmidtobreick, L; Tappert, C; Neustroev, V; Porritt, I (Oxford University Press on behalf of the Royal Astronomical Society, 2019-08)
    OGLE-LMC-DPV-065 is an interacting binary whose double-hump long photometric cycle remains hitherto unexplained. We analyze photometric time series available in archive data sets spanning 124 yr and present the analysis ...
  • Revisiting the variable star population in NGC 6229 and the structure of the horizontal branch 
    Arellano Ferro, A; Mancera Pina, P. E; Bramich, D. M; Giridhar, S; Ahumada, J. A; Kains, N; Kuppuswamy, K (Oxford University Press on behalf of the Royal Astronomical Society, 2015-09-01)
    We report an analysis of new V and I CCD time series photometry of the distant globular cluster NGC 6229. The principal aims were to explore the field of the cluster in search of new variables, and to Fourier decompose the ...
  • Dead or Alive? Long-term evolution of SN 2015bh (SNhunt275) 
    Elias-Rosa, N; Pastorello, A; Benetti, S; Cappellaro, E; Taubenberger, S; Terreran, G; Fraser, M; Brown, P. J; Tartaglia, L; Morales-Garoffolo, A; Harmanen, J; Richardson, N. D; Artigau, E; Tomasella, L; Margutti, R; Smartt, S. J; Dennefeld, M; Turatto, M; Anupama, G. C; Arbour, R; Berton, M; Bjorkman, K. S; Boles, T; Briganti, F; Chornock, R; Ciabattari, F; Cortini, G; Dimai, A; Gerhartz, C. J; Itagaki, K; Kotak, R; Mancini, R; Martinelli, F; Milisavljevic, D; Misra, K; Ochner, P; Patnaude, D; Polshaw, J; Sahu, D. K; Zaggia, S (Oxford University Press on behalf of the Royal Astronomical Society, 2016-12)
    Supernova (SN) 2015bh (or SNhunt275) was discovered in NGC 2770 on 2015 February with an absolute magnitude of Mr ∼ −13.4 mag, and was initially classified as an SN impostor. Here, we present the photometric and spectroscopic ...
  • Parsec-scale jet properties of the quasar PG 1302-102 
    Mohan, P; An, T; Frey, S; Mangalam, A; Gabanyi, K. E; Kun, E (Oxford University Press on behalf of the Royal Astronomical Society, 2016-12-01)
    The quasar PG 1302−102 is believed to harbour a supermassive binary black hole (SMBBH) system. Using the available 15 GHz and 2–8 GHz, multi-epoch Very Long Baseline Array data, we constrain the pc-scale jet properties ...
  • ASASSN-16fp (SN 2016coi): A Transitional Supernova between Type Ic And Broad-Lined Ic 
    Brajesh Kumar; Singh, A; Srivastav, S; Sahu, D. K; Anupama, G. C (Oxford University Press on behalf of the Royal Astronomical Society, 2018-01)
    We present results based on a well-sampled optical ( UBVRI ) and ultraviolet ( Swift /UVOT) imaging, and low-resolution optical spectroscopic follow-up observations of the nearby Type Ic supernova (SN) ASASSN-16fp ...
  • Astrometric results of observations of mutual occultations and eclipses of the Uranian satellites in 2007 
    Arlot, J.-E; Emelyanov, N. V; Aslan, Z; Assafin, M; Bel, J; Bhatt, B. C; Braga-Ribas, F; Camargo, J. I. B; Casas, R; Colas, F; Coliac, J. F; Dumas, C; Ellington, C. K; Forne, E; Frappa, E; Khamitov, I; Miller, C; Modic, R. J; Sahu, D. K; Sicardy, B; Tanga, P; Sada, P. V; Vasundhara, R; Vieira-Martins, R (EDP Sciences, 2013-09)
    Context. The photometry of mutual occultations and eclipses of natural planetary satellites can be used to infer very accurate astrometric data. This can be achieved by processing the light curves of the satellites observed ...
  • Polarized Line Formation in Non-Monotonic Velocity Fields 
    Sampoorna, M; Nagendra, K. N (IOP Publishing, 2016-12-10)
    For a correct interpretation of the observed spectro-polarimetric data from astrophysical objects such as the Sun, it is necessary to solve the polarized line transfer problems taking into account a realistic temperature ...
  • The detection of Diffuse Extended Structure in 3C 273: implications for jet power 
    Punsly, B; Kharb, P (IOP Publishing, 2016-12-10)
    We present deep Very Large Array imaging of 3C 273 in order to determine the diffuse, large scale radio structure of this famous radio-loud quasar. Diffuse extended structure (radio lobes) is detected for the first time ...
  • Investigation of helicity and energy flux transport in three emerging solar active regions 
    Vemareddy, P (IOP Publishing, 2015-06-20)
    We report the results of an investigation of helicity and energy flux transport from three emerging solar active regions (ARs). Using time sequence vector magnetic field observations obtained from the Helioseismic Magnetic ...
  • Alternate Models to Dark Energy 
    Arun, K; Gudennavar, S. B; Prasad, A; Sivaram, C (Elsevier B.V, 2018-01)
    One of the unresolved questions currently in cosmology is that of the non-linear accelerated expansion of the universe. This has been attributed to the so called Dark Energy (DE). The accelerated expansion of the universe ...

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