IIAP Publications: Recent submissions

  • 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 ...
  • Aligning and phasing segmented mirror telescope with the pyramid sensor 
    Jacob, A; Parihar, P; Sindhu, Divakaran; James, Melvin.K (SPIE--The International Society for Optical Engineering, 2018-07)
    Alignment and Phasing system (APS) is one of essential device for any segmented mirror telescope. It helps to align and phase mirror segments, so that all together they works like a monolithic surface. Over last two years ...
  • Applying the weighted horizontal magnetic gradient method to a simulated flaring active region 
    Korsos, M. B; Chatterjee, Piyali; Erdelyi, R (IOP Publishing, 2018-04-20)
    Here, we test the weighted horizontal magnetic gradient (WGM) as a flare precursor, introduced by Korsós et al., by applying it to a magnetohydrodynamic (MHD) simulation of solar-like flares. The preflare evolution of the ...
  • Understanding Li enhancement in K giants and role of accurate parallaxes 
    Raghubar Singh; Reddy, B. E (Cambridge University Press, 2018-07)
    Our recent studies based on a large sample of K giants with Hipparcos parallaxes and spectroscopic analysis resulted more than a dozen new Li-rich K giants including few super Lirich ones. Most of the Li-rich K giants ...
  • Long-term Study of the Solar Filaments from the Synoptic Maps as Derived from a H Spectroheliograms of the Kodaikanal Observatory 
    Chatterjee, Subhamoy; Hegde, M; Banerjee, D; Ravindra, B (IOP Publishing, 2017-11)
    The century long ( 1914 – 2007 ) a H ( 656.28 nm ) spectroheliograms from the Kodaikanal Solar Observatory ( KSO ) have been recently digitized. Using these newly calibrated, processed images we study the ...
  • Abundance analysis of a CEMP-no star in the Carina dwarf spheroidal galaxy 
    Susmitha Rani, A; Koch, A; Sivarani, T (EDP Sciences, 2017-10)
    Carbon-enhanced metal-poor (CEMP) stars bear important imprints of the early chemical enrichment of any stellar system. While these stars are known to exist in copious amounts in the Milky Way halo, detailed chemical ...
  • Mercury monohalides: suitability for electron electric dipole moment searches 
    Srinivasa Prasannaa, V; Vutha, A. C; Abe, M; Das, B. P (The American Physical Society, 2015-05)
    Heavy polar diatomic molecules are the primary tools for searching for the T-violating permanent electric dipole moment of the electron (eEDM). Valence electrons in some molecules experience extremely large effective ...
  • Design and modeling of a tunable spatial heterodyne spectrometer for emission line studies 
    Nirmal, K; Sridharan, R; Sriram, S; Murthy, J; Ambily, S; Safonova, M; Sreejith, A. G; Mathew, J; Mayuresh, Sarpotdar (SPIE--The International Society for Optical Engineering, 2018-04)
    Spatial heterodyne spectroscopy (SHS) is an interferometric technique similar to the Fourier transform spectroscopy with heritage from the Michelson interferometer. An imaging detector is used at the output of an SHS to ...
  • Strength of the Solar Coronal Magnetic Field A Comparison of Independent Estimates Using Contemporaneous Radio and White-Light Observations 
    Anshu Kumari; Ramesh, R; Kathiravan, C; Wang, T. J (Springer, 2017-11)
    Abstract We estimated the coronal magnetic field strength (B) during the 23 July 2016 coronal mass ejection (CME) event using i) the flux rope structure of the CME in the whitelight coronagraph images and ii) the ...
  • Correlation trends in the hyperfine structures of 210, 212Fr 
    Sahoo, B. K; Nandy, D. K; Das, B. P; Sakemi, Y (The American Physical Society, 2015-04)
    We demonstrate the importance of electron correlation effects in the hyperfine structure constants of many low-lying states in 210Fr and 212Fr. This is achieved by calculating the magnetic dipole and electric quadrupole ...
  • All sky scanning cloud monitor for NLOT site survey 
    Sharma, T. K; Parihar, P. S; Kemkar, P. M. M (IOP Publishing, 2015-05)
    Monitoring local sky for the cloud is one of important task before setting-up a new observatory. Here we present the design, implementation and initial results of a scanning type cloud monitor developed in Indian Institute ...
  • Solar Type IIIb Radio Bursts as Tracers for Electron Density Fluctuations in the Corona 
    Mugundhan, V; Hariharan, K; Ramesh, R (Springer, 2017-11)
    We present an estimation of the electron density modulation index ( δN Nee ) for the first time using solar type IIIb radio burst observations. The mean value of δN Nee is calculated to be ≈ 0.006 ± 0.002 over the ...
  • Constraints on dark matter models from the observation of Triangulum-II with the Fermi Large Area Telescope 
    Biswas, Sayan; Bhattacharjee, P; Majumdar, P; Das, Subinoy; Mousumi Das; Joarder, P. S (IOP Publishing, 2017-11)
    Triangulum-II, a newly discovered dwarf spheroidal galaxy, is a strong candidate for the indirect search of dark matter through the detection of γ -ray emission that could originate from the pair- annihilation ...
  • Multi-wavelength observations of 3C 279 during the extremely bright gamma-ray flare in 2014 March-April 
    Paliya, Vaidehi S; Sahayanathan, S; Stalin, C. S (IOP Publishing, 2015-04)
    The well-studied blazar 3C 279 underwent a giant γ-ray outburst in 2014 March–April. The measured γ-ray flux is the highest detected from 3C 279 by the Fermi Large Area Telescope. Hour scale γ-ray flux variability is ...
  • Awakening of the high-redshift blazar CGRaBS J0809+5341 
    Paliya, Vaidehi S; Parker, M. L; Stalin, C. S; Fabian, A. C; Ramya, S; Covino, S; Tagliaferri, G; Sahayanathan, S; Ravikumar, C. D (IOP Publishing, 2015-04)
    CGRaBS J0809+5341, a high-redshift blazar at z = 2.144, underwent a giant optical outburst on 2014 April 19 when it brightened by ~5 mag and reached an unfiltered apparent magnitude of 15.7 mag. This implies an absolute ...
  • Constraint on noncommutative spacetime from PLANCK data 
    Joby, P. K; Pravabati, C; Das, Subinoy (The American Physical Society, 2015-04)
    We constrain the energy scale of noncommutativity of spacetime using cosmic microwave background data from PLANCK. We find that PLANCK data put the lower bound on the noncommutativity energy scale to about 20 TeV, which ...
  • Prominence Eruption Initiated by Helical Kink Instability of an Embedded Flux Rope 
    Vemareddy, P; Gopalswamy, N; Ravindra, B (IOP Publishing, 2017-11)
    We study the triggering mechanism of a limb-prominence eruption and the associated coronal mass ejection ( CME ) near AR 12342 using Solar Dynamics Observatory and Large Angle and Spectrometric Coronagraph / Solar ...
  • Characterization of sites for Indian large optical telescope project 
    Parihar, P. S; Sharma, T. K; Surendran, A; Kemkar, P. M. M; Dadul; Stanzin, U; Anupama, G. C (IOP Publishing, 2015-04)
    Growing Indian astronomical community require access to large observing facility preferably located within the country. Site surveys carried out in the post indicates that the best sites for optical-NIR astronomy can better ...
  • A detailed analysis of barium oxide molecular lines in sunspot umbral spectra 
    Shanmugapriya, G; Karthikeyan, B; Balachandrakumar, K; Rajamanickam, N; Bagare, S. P (Springer, 2015-06)
    It is essential to know the composition of atoms or molecules present in the astrophysical objects concerned to determine the physical and chemical nature of a solar or stellar region. With the aim to identify them clearly, ...

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