IIAP Publications: Recent submissions

  • Multiple scattering polarization – Application of Chandrasekhar’s formalisms to the atmosphere of brown dwarfs and extrasolar planets 
    Sengupta, S; Marley, Mark S (Indian Academy of Science, 2011-07)
    Chandrasekhar’s formalisms for the transfer of polarized radiation are used to explain the observed dust scattering polarization of brown dwarfs in the optical band. Model polarization profiles for hot and young directly ...
  • Disks around young stellar objects 
    Bhatt, H. C (Indian Academy of Science, 2011-07)
    By 1939, when Chandrasekhar’s classic monograph on the theory of Stellar Structure was published, although the need for recent star formation was fully acknowledged, no one had yet recognized an object that could be called ...
  • Dieterici gas as a unified model for dark matter and dark energy 
    Sivaram, C; Arun, K; Nagaraja, R (Springer, 2011-10)
    The dominance of dark energy in the universe has necessitated the introduction of a repulsive gravity source to make q0 negative. The models for dark energy range from a simple term to quintessence, Chaplygin gas, ...
  • Some enigmatic aspects of the early universe 
    Sivaram, C; Arun, K (Springer, 2011-08)
    Matter collapsing to a singularity in a gravitational field is still an intriguing question. Similar situation arises when discussing the very early universe or a universe recollapsing to a singularity. It was suggested ...
  • The CMF as provenance of the stellar IMF? 
    Anathpindika, S (Elsevier B.V., 2011-12)
    In the present work we examined the hypothesis that, a core mass function (CMF), such as the one deduced for cores in the Orion molecular cloud (OMC), could possibly be the primogenitor of the stellar initial mass function ...
  • Theoretical Spectra of the AM Canum Venaticorum Binary System SDSS J0926+3624: Effects of Irradiation onto the Donor Star 
    Sengupta, S; Taam, R. E (IOP Publishing, 2011-09-20)
    Taking into account a range of parameters determined from the evolution- ary models and available observational data, the detailed non-LTE spectrum for the primary star and the irradiated donor star in the AM CVn system ...
  • History of optical glass and optical technology in India 
    Saxena, A. K; Vagiswari, A (Indian National Science Academy, 1990)
  • Transient Solution of Equations of Hydrodynamics in Gas Clouds 
    Peraiah, A (Indian Institute of Astrophysics, 1981)
    We have presented numerical results of transient phenomenon in incompressible fluids. This has been obtained by solving the equations of conservation of momentum, energy and mass in X and Y geometry. We have used the explict ...
  • Observations of the Solar Ca I 4227 Å Line 
    Bianda, M; Ramelli, R; Stenflo, J. O; Anusha, L. S; Nagendra, K. N; Sampoorna, M; Holzreuter, R; Frisch, H (Astronomical Society of the Pacific, 2011-04)
    Our aim is to understand some interesting polarization features observed in the solar Ca I 4277 Å line. Here we only discuss the observational aspects. Observations have also been made in other chromospheric lines within ...
  • Spectroscopy of Protonated and Deprotonated PAHs 
    Hammonds, M; Pathak, A; Candian, A; Sarre, P. J (EDP Sciences, 2011-03)
    The spectroscopic properties of protonated and deprotonated PAHs are investigated through Density Functional Theory (DFT) calculations, with reference to their potential astrophysical significance. Attention is focussed ...
  • Linear Polarization of the Solar Ca I 4227 Å Line: Modeling with Radiative Transfer and Last Scattering Approximation 
    Anusha, L. S; Stenflo, J. O; Frisch, H; Bianda, M; Holzreuter, R; Nagendra, K. N; Sampoorna, M; Ramelli, R (Astronomical Society of the Pacific, 2011-04)
    To model the Ca I 4227 Å line polarization, radiative transfer effects with partial frequency redistribution (PRD) must be taken into account. The numerical solution of the relevant polarized radiative transfer (RT) equations ...
  • Quantum phases of ultracold bosonic atoms in a one-dimensional optical superlattice 
    Dhar, A; Mishra, T; Pai, R. V; Das, B. P (American Physical Society, 2011-05)
    We analyze various quantum phases of ultracold bosonic atoms in a periodic one-dimensional optical superlattice. Our studies have been performed using the finite-size density-matrix renormalization group method in the ...
  • Reappraisal of the Electric Dipole Moment Enhancement Factor for Thallium 
    Nataraj, H. S; Sahoo, B. K; Das, B. P; Mukherjee, D (American Physical Society, 2011-05-20)
    The electric dipole moment (EDM) enhancement factor of atomic Tl is of considerable interest as it has been used in determining the most accurate limit on the electron EDM to date. However, its value varies from -179 to ...
  • Low-frequency Observations of Polarized Emission from Long-lived Non-thermal Radio Sources in the Solar Corona 
    Ramesh, R; Kathiravan, C; Satya Narayanan, A (IOP Publishing, 2011-06-10)
    We report observations of circularly polarized emission from the solar corona at 77 MHz during the periods 2006 August 11-18, 2006 August 23-29, and 2007 May 16-22 in the minimum phase between the sunspot cycles 23 and 24. ...
  • Dust-scattered Ultraviolet Halos around Bright Stars 
    Murthy, J; Conn Henry, R (IOP Publishing, 2011-06-10)
    We have discovered ultraviolet (UV) halos extending as far as 5° around four (of six) bright UV stars using data from the Galaxy Evolution Explorer satellite. These halos are due to scattering of the starlight from nearby ...
  • Observations of the forward scattering Hanle effect in the Ca I  4227 Å  line 
    Bianda, M; Ramelli, R; Anusha, L. S; Stenflo, J. O; Nagendra, K. N; Holzreuter, R; Sampoorna, M; Frisch, H; Smitha, H. N (EDP Sciences, 2011-06)
    Chromospheric magnetic fields are notoriously difficult to measure. The chromospheric lines are broad, while the fields are producing a minuscule Zeeman-effect polarization. A promising diagnostic alternative is provided ...
  • Extrapolating Zernike Moments to Predict Future Optical Wave-fronts in Adaptive Optics Using Real Time Data Mining 
    Vyas, A; Roopashree, M. B; Prasad, B. R (David Publishing Company, 2011-03)
    We present the details of predicting atmospheric turbulence by mining Zernike moment data obtained from simulations as well as experiments. Temporally correlated optical wave-fronts were simulated such that they followed ...
  • Deep Impact, Stardust-NExT and the behavior of Comet 9P/Tempel 1 from 1997 to 2010 
    Meech, K. J; Pittichova, J; Yang, B; Zenn, A; Belton, M. J. S; A’Hearn, M. F; Bagnulo, S; Bai, J; Barrera, L; Bauer, J. M; Bedient, J; Bhatt, B. C; Boehnhardt, H; Brosch, N; Buie, M; Candia, P; Chen, W; Chesley, S; Chiang, P; Choi, Y; Cochran, A; Duddy, S; Farnham, T. L; Fernández, Y; Gutiérrez, P; Hainaut, O. R; Hampton, D; Herrmann, K; Hsieh, H; Kadooka, M. A; Kaluna, H; Keane, J; Kim, M; Kleyna, J; Krisciunas, K; Lauer, T. R; Lara, L; Licandro, J; Lowry, S. C; McFadden, L. A; Moskovitz, N; Mueller, B. E. A; Polishook, D; Raja, N. S; Riesen, T; Sahu, D. K; Samarasinha, N. H; Sarid, G; Sekiguchi, T; Sonnett, S; Suntzeff, N; Taylor, B; Tozzi, G. P; Vasundhara, R; Vincent, J; Wasserman, L; Webster-Schultz, B; Zhao, H (Elsevier B.V., 2011-05)
    We present observational data for Comet 9P/Tempel 1 taken from 1997 through 2010 in an international collaboration in support of the Deep Impact and Stardust-NExT missions. The data were obtained to characterize the nucleus ...
  • Spectroscopic Observation of Oscillations in the Corona During the Total Solar Eclipse of 22 July 2009 
    Singh, J; Hasan, S. S; Gupta, G. R; Nagaraju, K; Banerjee, D (Springer, 2011-05)
    We performed high resolution spectroscopy of the solar corona during the total solar eclipse of 22 July 2009 in two emission lines: the green line at 5303 Å due to Fe xiv and the red line at 6374 Å due to Fe x, simultaneously ...
  • TAUVEX: status in 2011 
    Brosch, N; Murthy, J (Springer, 2011-09)
    We present a short history of the TAUVEX instrument, conceived to provide multi-band wide-field imaging in the ultraviolet, emphasizing the lack of sufficient and aggressive support on the part of the different space ...

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