IIAP Publications: Recent submissions

  • Frequency-dependent core shifts and parameter estimation for the blazar 3C 454.3 
    Mohan, Prashanth; Agarwal, A; Mangalam, A; Gupta, A. C; Wiita, P. J; Volvach, A. E; Aller, M. F; Aller, H. D; Gu, M. F; Lahteenmaki, A; Tornikoski, M; Volvach, L. N (Oxford University Press on behalf of the Royal Astronomical Society, 2015-09-11)
    We study the core shift effect in the parsec-scale jet of the blazar 3C 454.3 using the 4.8– 36.8 GHz radio light curves obtained from three decades of continuous monitoring. From a piecewise Gaussian fit to each flare, ...
  • Ultraviolet stellar population of the old open cluster M67 (NGC 2682) 
    Sindhu, N; Subramaniam, A; Anu Radha, C (Oxford University Press on behalf of the Royal Astronomical Society, 2018-11)
    We present the results of ultraviolet (UV) photometry of the old open cluster M67 obtained using Galaxy Evolution Explorer in far-ultraviolet (FUV) and near-ultraviolet (NUV) bands. UV detections of 18 blue straggler stars ...
  • Non-gaussianity of diffuse galactic synchrotron emission at 408 MHz 
    Rana, S; Ghosh, T; Bagla, Jasjeet S; Pravabati, C (Oxford University Press on behalf of the Royal Astronomical Society, 2018-11)
    Diffuse Galactic emission at low frequencies is a major contaminant for studies of redshifted 21 cm line studies. Removal of these foregrounds is essential for exploiting the signal from neutral hydrogen at high redshifts. ...
  • A study of the star-forming regions in the spiral galaxy NGC 2336 using the Ultraviolet Imaging Telescope (UVIT) 
    Rahna, P. T; Mousumi Das; Murthy, J; Gudennavar, S. B; Bubbly, S. G (Oxford University Press on behalf of the Royal Astronomical Society, 2018-11)
    We present a far-ultraviolet (FUV) and near-ultraviolet (NUV) imaging study at 1.2 arcsec resolution of recent star formation in the nearby spiral galaxy NGC 2336 using the Ultraviolet Imaging Telescope (UVIT) on-board ...
  • Solar meridional circulation from twenty-one years of SOHO/MDI and SDO/HMI observations Helioseismic travel times and forward modeling in the ray approximation 
    Liang, Zhi-Chao; Gizon, L; Birch, A. C; Duvall, T. L. Jr; Rajaguru, S. P (EDP Sciences, 2018-11)
    Context. The solar meridional flow is an essential ingredient in flux-transport dynamo models. However, no consensus on its subsurface structure has been reached. Aims. We merge the data sets from SOHO/MDI and SDO/HMI ...
  • WISE view of narrow-line Seyfert 1 galaxies: mid-infrared colour and variability 
    Rakshit, S; Johnson, A; Stalin, C. S; Gandhi, Poshak; Hoenig, Sebastian (Oxford University Press on behalf of the Royal Astronomical Society, 2019-02)
    We present the colour and flux variability analysis at 3.4 μm (W1 band) and 4.6 μm (W2 band) of 492 narrow-line Seyfert 1 (NLSy1) galaxies using archival data from the Wide-field Infrared Survey Explorer (WISE). In the ...
  • Long-term ultraviolet variability of Seyfert galaxies 
    Sukanya, N; Stalin, C. S; Joseph, P; Rakshit, S; Praveen, D; Damle, R (Indian Academy of Sciences, 2018-12)
    Flux variability is one of the defining characteristics of Seyfert galaxies, a class of active galactic nuclei (AGN). Although these variations are observed over a wide range of wavelengths, results on their flux variability ...
  • Four-component relativistic state-specific multireference perturbation theory with a simplified treatment of static correlation 
    Ghosh, A; Sinha Ray, Suvonil; Chaudhuri, R. K; Chattopadhyay, Sudip (American Chemical Society, 2017-02-23)
    The relativistic multireference (MR) perturbative approach is one of the most successful tools for the description of computationally demanding molecular systems of heavy elements. We present here the ground state dissociation ...
  • Line identification and photometric history of the hot post-AGB star Hen 3−1013 (IRAS 14331−6435) 
    Arkhipova, V. P; Parthasarathy, M; Ikonnikova, N. P; Ishigaki, M; Hubrig, S; Sarkar, G; Kniazev, A. Y (Oxford University Press on behalf of the Royal Astronomical Society, 2018-12)
    We present a study of the high-resolution optical spectrum for the hot post-asymptotic giant branch (post-AGB) star, Hen 3−1013, identified as the optical counterpart of the infrared source IRAS 14331−6435. For the first ...
  • Characterization of the HD 219134 multi-planet system II. Stellar-wind sputtered exospheres in rocky planets b & c 
    Vidotto, A. A; Lichtenegger, H; Fossati, L; Folsom, C. P; Wood, B. E; Murthy, J; Petit, P; Sreejith, A. G; Valyavin, G (Oxford University Press on behalf of the Royal Astronomical Society, 2018-12)
    We present a 3D study of the formation of refractory-rich exospheres around the rocky planets HD219134b and c. These exospheres are formed by surface particles that have been sputtered by the wind of the host star. The ...
  • Intra-night optical variability of misaligned active galaxies 
    Bhattacharya, Debbijoy; Gulati, S; Stalin, C. S (Oxford University Press on behalf of the Royal Astronomical Society, 2019-03)
    The majority of the γ-ray sources detected by the Fermi Gamma-ray Space Telescope belong to the blazar class of active galactic nuclei (AGNs). In addition to blazars, a minority of non-blazar AGNs is also found to be γ-ray ...
  • Association of calcium network brightness with polar magnetic fields 
    Narang, Nancy; Chandrashekhar, K; Pant, V; Banerjee, D (Cambridge University Press, 2018-02)
    Recent dedicated HINODE polar region campaign revealed the presence of concentrated kilogauss patches of magnetic field in the polar regions of Sun which are also shown to be correlated with facular bright points at the ...
  • Non-local Thermodynamic Equilibrium Abundance Analyses of the Extreme Helium Stars V652Her and HD144941 
    Pandey, G; Lambert, D. L (IOP Publishing, 2017-10)
    Optical high-resolution spectra of V652 Her and HD 144941, the two extreme helium stars with exceptionally low C / He ratios, have been subjected to a non-LTE abundance analysis using the tools TLUSTY and SYNSPEC. De fi ning ...
  • Four years of starspot evolution on an active F-type ultra-fast rotator KIC 6791060 
    Karmakar, Subhajeet; Pandey, J. C; Savanov, Igor S; Raj, A; Dmitrienko, E. S; Pakhomov, Yurij; Sahu, D. K (Cambridge University Press, 2018-02)
    Using the data obtained from Kepler satellite, we have analyzed an F-type ultra-fast rotator KIC 6791060. We derive a rotational period of 0.34365±0.00004 d. Multiple periodicity with a period separation of ∼0.00016 d was ...
  • A relativistic equation-of-motion coupled-cluster investigation of the trends of single and double ionization potentials in the He and Be isoelectronic systems 
    Pathak, H; Sahoo, B. K; Sengupta, Turbasu; Das, B. P; Vaval, N; Pal, S (IOP Publishing, 2015-06)
    We employ a four-component spinor relativistic equation-of-motion coupled-cluster (EOMCC) method within the single- and double- excitation approximation to calculate the single ionization potentials (IPs) and double ...
  • Study of long-term variations in hemispheric asymmetry of solar activity 
    Ravindra, B; Javaraiah, J (Cambridge University Press, 2018-02)
    Sunspot activity exhibits hemispheric asymmetry. We study the long-term variations in the hemispheric sunspot area from Kodaikanal white-light data during 1921 – 2011. The results on the presence or absence of double peak ...
  • Flexure compensation simulation tool for TMT-WFOS spectrograph 
    Surya, Arun; Radovan, Matthew; Sivarani, T; Sriram, S; Devika, Divakar; Fucik, Jason (SPIE--The International Society for Optical Engineering, 2018-07)
    The Wide Field Optical Spectrograph (WFOS) is one of the first-light instruments of Thirty Meter Telescope. It is a medium resolution, multi object, wide field optical spectrograph. Since 2005 the conceptual design of the ...
  • Long-term variability of the solar cycle in the Babcock-Leighton dynamo framework 
    Karak, B. B; Miesch, Mark (Cambridge University Press, 2018-02)
    We explore the cause of the solar cycle variabilities using a novel 3D Babcock– Leighton dynamo model. In this model, based on the toroidal flux at the base of the convection zone, bipolar magnetic regions (BMRs) are ...
  • Beginning of Activity in Long-period Comet C / 2015 ER61 ( PANSTARRS ) 
    Meech, K. J; Schambeau, C. A; Sorli, K; Kleyna, J; Micheli, M; Bauer, J; Denneau, L; Keane, J. V; Toller, E; Wainscoat, R; Hainaut, O; Bhatt, B. C; Sahu, D. K; Yang, B; Kramer, E; Magnier, G (IOP Publishing, 2017-05)
    We report the beginning of activity for comet C / 2015 ER61 ( PANSTARRS ) , the fi rst instance of watching a long- period comet turn on. Pre-discovery observations and observations from the NEOWISE space telescope ...
  • Design considerations of an inductive sensor for segmented mirror telescopes 
    Kumar, Varun; Parihar, P; Athul, Nakulan; Arjun, Manoharan (SPIE--The International Society for Optical Engineering, 2018-07)
    The Segmented mirror technology has become natural choice for any optical telescope larger than 8 meter in size, where small mirror segments are aligned and positioned with respect to each other to an accuracy of few tens ...

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