IIAP Publications: Recent submissions

  • Bose-Hubbard model in a strong effective magnetic field: Emergence of a chiral Mott insulator ground state 
    Dhar, A; Maji, M; Mishra, T; Pai, R. V; Mukerjee, S; Paramekanti, A (American Physical Society, 2012-04)
    Motivated by experiments on Josephson junction arrays, and cold atoms in an optical lattice in a synthetic magnetic field, we study the “fully frustrated” Bose-Hubbard model with half a magnetic flux quantum per plaquette. ...
  • Primordial Rotation of the Universe, Hydrodynamics, Vortices and Angular Momenta of Celestial Objects 
    Sivaram, C; Arun, K (Bentham Open, 2012-03)
    The origin of rotation or spin of objects, from stars to galaxies, is still an unanswered question. Even though there are models which try to explain this, none of them can account for the initial impulse that gave rise ...
  • J-state interference signatures in the second solar spectrum. Modeling the Cr I triplet at 5204-5208 
    Smitha, H. N; Nagendra, K. N; Stenflo, J. O; Bianda, M; Sampoorna, M; Ramelli, R; Anusha, L. S (EDP Sciences, 2012-05)
    The scattering polarization in the solar spectrum is traditionally modeled with each spectral line treated separately, but this is generally inadequate for multiplets where J-state interference plays a significant role. ...
  • TW Hya: Spectral Variability, X-Rays, and Accretion Diagnostics 
    Dupree, A. K; Brickhouse, N. S; Cranmer, S. R; Luna, G. J. M; Schneider, E. E; Bessell, M. S; Bonanos, A; Crause, L. A; Lawson, W. A; Mallik, S. V; Schuler, S. C (IOP Publishing, 2012-05-01)
    The nearest accreting T Tauri star, TW Hya was intensively and continuously observed over ~17 days with spectroscopic and photometric measurements from four continents simultaneous with a long segmented exposure using the ...
  • Twin Telescope observations of the Sun at Kodaikanal Observatory 
    Singh, J; Ravindra, B (Astronomical Society of India, 2012-03)
    We report the design, fabrication and installation of a ‘Twin Telescope’ at Kodaikanal Observatory intended to augment the ongoing synoptic observations of the Sun that have been carried out since 1904. The telescope uses ...
  • Towards new analysis of Gamma-Ray sources at HImalayan Gamma-Ray Observatory (HIGRO) in northern India 
    Britto, R. J; Acharya, B. S; Anupama, G. C; Bhatt, N; Bhattacharjee, P; Bhattacharya, S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Koul, R; Mahesh, P. K; Mitra, A; Nagesh, B. K; Parmar, N. K; Prabhu, T. P; Rannot, R. C; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tickoo, A. K; Tsewang, D; Upadhya, S. S; Vishwanath, P. R; Yadav, K. K (French Society of Astronomy and Astrophysics, 2010-12)
    The High Altitude GAmma-Ray (HAGAR) array is a wavefront sampling array of 7 telescopes, set-up at Hanle, at 4270 m a.s.l., in the Ladakh region of the Himalayas (North India). It constitutes the first phase of the HImalayan ...
  • Observations with the High Altitude GAmma Ray (HAGAR) telescope array in the Indian Himalayas 
    Britto, R. J; Acharya, B. S; Anupama, G. C; Bhatt, N; Bhattacharjee, P; Bhattacharya, S. S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Koul, R; Mahesh, P. K; Mitra, A; Nagesh, B. K; Parmar, N. K; Prabhu, T. P; Rannot, R. C; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tickoo, A. K; Tsewang, D; Upadhya, S; Vishwanath, P. R; Yadav, K. K (French Society of Astronomy and Astrophysics, 2010-12)
    For several decades, it was thought that astrophysical sources emit high energy photons within the energy range of the gamma-ray region of the lectromagnetic spectrum also. These photons originate from interactions of high ...
  • Almahata Sitta meteorite: gamma -activity measurements at Monte dei Cappuccini Laboratory in Torino 
    Taricco, C; Bhandari, N; Colombetti, P; Romero, A; Vivaldo, G; Sinha, N; Jenniskens, P; Shaddad, M. H (Societa Astronomica Italiana, 2012)
    The asteroid 2008 TC3 was telescopically seen prior to entering Earth’s atmosphere and was predicted to fall in Sudan on October 7, 2008, as it actually happened. Subsequently, many fragments were collected from the Nubian ...
  • State specific multireference moller–plesset perturbation theory: a few applications to ground, excited and ionized states 
    Chattopadhyay, S; Mahapatra, U. S; Chaudhuri, R. K (Elsevier, 2012-06-05)
    We provide further tests and illustrations of the complete active space based statespecificmultireferenceMøller–Plessetperturbationtheory (SS-MRMPPT) which opens the way for the treatment of dynamic correlations in situations ...
  • Rigid Indian plate: Constraints from GPS measurements 
    Mahesh, P; Catherine, J. K; Gahalaut, V. K; Kundu, B; Ambikapathy, A; Bansal, A; Premkishore, L; Narsaiah, M; Ghavri, S; Chadha, R. K; Choudhary, P; Singh, D. K; Singh, S. K; Kumar, S; Nagarajan, B; Bhatt, B. C; Tiwari, R. P; Kumar, A; Kumar, A; Bhu, H; Kalita, S (Elsevier, 2012-11)
    We analyze GPS data from 26 sites located on the Indian plate and along its boundary. The large spatial coverage of the Indian plate by these sites and longer data duration helped us in refining the earlier estimates of ...
  • Line-of-sight observables algorithms for the helioseismic and magnetic imager (HMI) Instrument Tested with Interferometric bidimensional spectrometer (IBIS) observations 
    Couvidat, S; Rajaguru, S. P; Wachter, R; Sankarasubramanian, K; Schou, J; Scherrer, P. H (Springer, 2012-05)
    The Helioseismic and Magnetic Imager (HMI) instrument onboard the Solar Dynamics Observatory produces line-of-sight (LOS) observables (Doppler velocity, magneticfield strength, Fe I line width, line depth, and continuum ...
  • Study of candidate be stars in the magellanic clouds using near-infrared photometry and optical spectroscopy 
    Paul, K. T; Subramaniam, A; Mathew, B; Mennickent, R. E; Sabogal, B (Wiley-Blackwell, 2012-04)
    Mennickent et al. and Sabogal et al. identified a large number of classical Be (CBe) candidates (∼3500) in the Large and Small Magellanic Clouds (LMC and SMC) based on their photometric variability using the OGLE II data ...
  • FR Cnc revisited: photometry, polarimetry and spectroscopy 
    Golovin, A; Galvez-Ortiz, M. C; Hernan-Obispo, M; Andreev, M; Barnes, J. R; Montes, D; Pavlenko, E; Pandey, J. C; Martinez-Arnaiz, R; Medhi, B. J; Parihar, P. S; Henden, A; Sergeev, A; Zaitsev, S. V; Karpov, N (Wiley-Blackwell, 2012-03)
    This paper is part of a multiwavelength study aimed at using complementary photometric, polarimetric and spectroscopic data to achieve an understanding of the activity process in late-type stars. Here, we present the ...
  • Rapid disappearance of penumbra-like features near a flaring polarity inversion line: the hinode observations 
    Ravindra, B; Gosain, S (Hindawi Publishing Corporation, 2012-03)
    We present the observations of penumbra like features (PLFs) near a polarity inversion line (PIL) of flaring region. The PIL is located at the moat boundary of active region (NOAA 10960). The PLFs appear similar to sunspot ...
  • SoLEXS - A low energy X-ray spectrometer for solar coronal studies 
    Sankarasubramanian, K; Ramadevi, M. C; Bug, M; Umapath, C. N; Seetha, S; Sreekumar, P; Kumar (Astronomical Society of India, 2011)
    A Solar Low-energy X-ray Spectrometer (SoLEXS), a high spectral resolution (≤ 250 eV at 5.9 keV) instrument with soft X-ray energy coverage (≤ 1.5 keV), is being proposed as an additional payload on-board Aditya-1. The ...
  • EUV line intensity distribution in the solar atmosphere: differences between a polar coronal hole and its equatorial extension 
    Raju, K. P; Bromage, B. J. I (EDP Sciences, 2006-01)
    Intensity histograms of 14 EUV emission lines in a polar coronal hole, its equatorial extension, the "Elephant's Trunk", and the adjacent quiet Sun regions have been obtained from SOHO/CDS observations made in August and ...
  • Equilibrium structures in partially ionized rotating plasmas within Hall magnetohydrodynamics 
    Krishan, V; Yoshida, Z (American Institute of Physics, 2006-09)
    The formation of equilibrium structures in partially ionized rotating plasmas, consisting of electrons, ions, and neutral molecules, including the Hall effect, is studied in order to diagnose the possible velocity and the ...
  • Random phase approximation for allowed and parity non-conserving electric dipole transition amplitudes and its connection with many-body perturbation theory and coupled-cluster theory 
    Gopakumar, G; Sur, C; Das, B. P; Chaudhuri, R. K; Mukherjee, D; Hirao, K (World Scientific Publishing Co, 2006)
    The connections between the Random Phase Approximation (RPA) and Many-Body Perturbation Theory (MBPT) and its all order generalization, the Coupled-Cluster Theory (CCT), have been explored. Explicit expressions have been ...
  • Discovery of Main-belt Comet P/2006 VW139 by Pan-STARRS1 
    Hsieh, H. H; Yang, Bin; Haghighipour, N; Kaluna, H. M; Fitzsimmons, A; Denneau, L; Novakovic, B; Jedicke, R; Wainscoat, R. J; Armstrong, J. D; Duddy, S. R; Lowry, S. C; Trujillo, C. A; Micheli, M; Keane, J. V; Urban, L; Riesen, T; Meech, K. J; Abe, S; Cheng, Yu-Chi; Chen, Wen-Ping; Granvik, M; Grav, T; Ip, Wing-Huen; Kinoshita, D; Kleyna, J; Lacerda, P; Lister, T; Milani, A; Tholen, D. J; Vereš, P; Lisse, C. M; Kelley, M. S; Fernández, Y. R; Bhatt, B. C; Sahu, D. K; Kaiser, N; Chambers, K. C; Hodapp, K. W; Magnier, E. A; Price, P. A; Tonry, J. L (IOP Publishing, 2012-03-20)
    The main-belt asteroid (300163) 2006 VW139 (later designated P/2006 VW139) was discovered to exhibit comet-like activity by the Pan-STARRS1 (PS1) survey telescope using automated point-spread-function analyses performed ...
  • Voyager Observations of the Diffuse Far-ultraviolet Radiation Field 
    Murthy, J; Conn Henry, R; Holberg, Jay B (IOP Publishing, 2012-03)
    The two Voyager spacecraft have completed their planetary exploration mission and are now probing the outer realms of the heliosphere. The Voyager ultraviolet spectrometers continued to operate well after the Voyager 2 ...

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