IIAP Publications: Recent submissions

  • Electron Scattering Redistribution Effect on Atomic Line Polarization 
    Supriya, H. D; Nagendra, K. N; Ravindra, B; Sampoorna, M (Astronomical Society of the Pacific, 2014-10)
    The scattering of line photons on free electrons modifies the polarization of the atomic spectral lines. Hence it is important to treat scattering by electrons as a redistribution process and to study in detail its effect ...
  • Precision controller for segmented mirror telescope actuator: control and tuning 
    Prasanna Deshmukh; Parihar, P. S (IEEE, 2016-03)
    The segmented mirror telescopes are built using small hexagonal mirrors positioned and aligned by the three actuators and six edge sensors per segment to maintain the shape of the primary mirror. The global loop controller ...
  • The Effect of Bulge Mass on Bar Pattern Speed in Disk Galaxies 
    Kataria, Sandeep Kumar; Mousumi Das (IOP Publishing, 2019-11)
    We present a study of the effect of bulge mass on the evolution of bar pattern speed in isolated disk galaxies using N -body simulations. Earlier studies have shown that disk stars at the inner resonances can transfer a ...
  • Concerning the Li-rich status of KIC 9821622: a Kepler field RGB star reported as a Li-rich giant 
    Raghubar Singh; Bharat Kumar, Y; Reddy, B. E; Aoki, W (Oxford University Press on behalf of the Royal Astronomical Society, 2020-01)
    Given the implications for the origin of Li enhancement in red giants, we have reviewed the Li-rich classification of KIC 9821622, the only bonafide red giant branch (RGB) giant with a He inert core to date, reported as a ...
  • Delving into the Historical Ca II K Archive from the Kodaikanal Observatory: The Potential of the Most Recent Digitized Series 
    Chatzistergos, Theodosios; Ermolli, Ilaria; Solanki, Sami K; Krivova, Natalie A; Banerjee, D; Jha, Bibhuti K; Chatterjee, Subhamoy (Springer, 2019-10)
    Full-disc Ca II K photographic observations of the Sun carry direct information as regards the evolution of solar-plage regions for more than a century and are therefore a unique dataset for solar-activity studies. For a ...
  • UVIT Open Cluster Study. II. Detection of Extremely Low Mass White Dwarfs and Post – Mass Transfer Binaries in M67 
    Jadhav, Vikrant V; Sindhu, N; Subramaniam, A (IOP Publishing, 2019-11)
    A detailed study of the UV-bright stars in the old open star cluster M67 is presented based on the far-UV observations using the Ultra Violet Imaging Telescope ( UVIT ) on ASTROSAT . The UV and UV – optical ...
  • The ALMaQUEST Survey: The Molecular Gas Main Sequence and the Origin of the Star-forming Main Sequence 
    Lin, Lihwai; Pan, Hsi-An; Ellison, Sara L; Belfiore, Francesco; Shi, Yong; Sánchez, Sebastián F; Hsieh, Bau-Ching; Rowlands, Kate; Ramya, S; Thorp, Mallory D; Li, Cheng; Maiolino, Roberto (IOP Publishing, 2019-10-20)
    The origin of the star-forming main sequence (SFMS; i.e., the relation between star formation rate and stellar mass, globally or on kpc scales) remains a hotly debated topic in galaxy evolution. Using the ALMA-MaNGA QUEnching ...
  • Solar polarization 7 
    Nagendra, K. N; Stenflo, J. O; Qu, Z. Q; Sampoorna, M (Astronomical Society of the Pacific, 2014-10)
    "This volume contains the proceedings of the 7th in a series of international solar polarization workshops that was initiated almost two decades ago. The aim of these workshops has been to explore the Sun and its magnetic ...
  • A catalogue of 108 extended planetary nebulae observed by GALEX 
    Pradhan, Ananta C; Panda, Swayamtrupta; Parthasarathy, M; Murthy, J; Ojha, Devendra K (Springer, 2019-10)
    We present the ultraviolet (UV) imaging observation of planetary nebulae (PNe) using archival data of Galaxy Evolution Explorer (GALEX). We found 358 PNe detected by GALEX in near-UV (NUV). We have compiled a catalogue of ...
  • GROWTH on S190425z: Searching Thousands of Square Degrees to Identify an Optical or Infrared Counterpart to a Binary Neutron Star Merger with the Zwicky Transient Facility and Palomar Gattini-IR 
    Coughlin, Michael W; Tomás Ahumada; Shreya Anand; Kishalay De; Hankins, Matthew J; Kasliwa, Mansi M; Singer, Leo P; Eric C. Bellm; Igor Andreoni; Bradley Cenko, S; Jeff Cooke; Copperwheat, Christopher M; Dugas, Alison M; Jencson, Jacob E; Perley, Daniel A; Po-Chieh Yu; Varun Bhalerao; Harsh Kumar; Bloom, Joshua S; Anupama, G. C; Ashley, Michael C. B; Ashot Bagdasaryan; Rahul Biswas; Buckley, David A. H; Burdge, Kevin B; Cook, David O; John Cromer; Virginia Cunningham; Antonino D ’ Aì; Dekany, Richard G; Alexandre Delacroix; Simone Dichiara; Duev, Dmitry A; Anirban Dutta; Michael Feeney; Sara Frederick; Pradip Gatkine; Shaon Ghosh; Goldstein, Daniel A; Zach Golkhou, V; Ariel Goobar; Graham, Matthew J; Hidekazu Hanayama; Takashi Horiuchi; Tiara Hung; Jha, Saurabh W; Kulkarni, Shrinivas R; Thomas Kupfer; Masci, Frank J; Paolo Mazzali; Moore, Anna M; Moses Mogotsi; Neill, James D; Chow-Choong Ngeow; Jorge Martínez-Palomera; Valentina La Parola; Pavana, M; Ofek, Eran O; Atharva Sunil Patil; Reed Riddle; Mickael Rigault; Ben Rusholme; Eugene Serabyn; Shupe, David L; Yashvi Sharma; Avinash Singh; Jesper Sollerman; Jamie Soon; Kai Staats; Kirsty Taggart; Hanjie Tan; Tony Travouillon; Eleonora Troja; Gaurav Waratkar; Yoichi Yatsu (IOP Publishing, 2019-11)
    The third observing run by LVC has brought the discovery of many compact binary coalescences. Following the detection of the fi rst binary neutron star merger in this run ( LIGO / Virgo S190425z ) , we performed ...
  • Polarized Line Formation in Arbitrary Strength Magnetic Fields: The Case of a Two-level Atom with Hyperfine Structure Splitting 
    Sampoorna, M; Nagendra, K. N; Sowmya, K; Stenflo, J. O; Anusha, L. S (IOP Publishing, 2019-10-01)
    Quantum interference effects, together with partial frequency redistribution (PFR) in line scattering, produce subtle signatures in the so-called Second Solar Spectrum (the linearly polarized spectrum of the Sun). These ...
  • Finding the Critical Decay Index in Solar Prominence Eruptions 
    Vasantharaju, N.; Vemareddy, P; Ravindra, B; Doddamani, V. H (IOP Publishing, 2019-11)
    The background fi eld is assumed to play a prime role in erupting structures like prominences. In the fl ux rope models, the critical decay index ( n c ) is a measure of the rate at which background fi eld ...
  • In fl uence of Wolf – Rayet Stars on Surrounding Star-forming Molecular Clouds 
    Baug, T; Richard de Grijs; Dewangan, L. K; Herczeg, Gregory J; Ojha, D. K; Ke Wang; Licai Deng; Bhatt, B. C (IOP Publishing, 2019-11)
    We investigate the in fl uence of Wolf – Rayet ( W-R ) stars on their surrounding star-forming molecular clouds. We study fi ve regions containing W-R stars in the inner Galactic plane ( l ∼ [ 14 ° ...
  • Ultraviolet Imaging Telescope View of Dwarf Irregular Galaxy IC 2574: Is the Star Formation Triggered Due to Expanding H I Shells? 
    Chayan Mondal; Subramaniam, A; Koshy George (IOP Publishing, 2019-11)
    Star-forming dwarf galaxies in the local volume are diverse and ideal test beds to understand the details of star formation in a variety of environments. Here we present a deep far-UV ( FUV ) imaging study of the ...
  • Spectroscopic study of the Carbon-Enhanced Metal-Poor star: HE 0110-0406 
    Meenakshi, P; Goswami, A; Doddamani, V. H (Societe Royale des Sciences de Liege, 2019-10)
    The halo system of the Milky way comprises the vast majority of the presently observed metal-poor ([Fe/H] <1.0) and very metal-poor ([Fe/H] <2.0) stars. A sizable fraction (~ 30%) of the metal-poor stars with carbon ...
  • Detecting Outliers in SDSS using Convolutional Neural Network 
    Sharma, K; Kembhavi, Ajit; Kembhavi, Aniruddha; Sivarani, T; Abraham, S. (Societe Royale des Sciences de Liege, 2019-10)
    We propose an automated algorithm based on Convolutional Neural Network (CNN) for the detection of peculiar objects in large databases using their spectral observations. A convolutional neural network is a class of ...
  • Planckian pre big bang phase of the Universe 
    Sivaram, C; Arun, K; Rebecca, L (Springer, 2020-01)
    The standard model of cosmology, although very successful, has problems with the very initial phase, such as the existence of a singularity when the density and curvature becomes infinite. In this work we propose a possible ...
  • Diffraction by ruled gratings with variable spacing: fundamental method of intensity calculation 
    Chatterjee, S; Vani, V. C; Haghighi, Rezvan R; Banyal, R. K (Optical Society of America, 2019-11-01)
    A regular diffraction grating produces intensity patterns that combine waves coming through equispaced slits, so that the waves emerging from any two neighboring slits have identical phase differences. In this paper, we ...
  • High-resolution spectroscopy of the high-velocity hot post-AGB star IRAS 18379–1707 (LS 5112) 
    Ikonnikova, N. P; Parthasarathy, M; Dodin, A. V; Hubrig, S; Sarkar, G (Oxford University Press on behalf of the Royal Astronomical Society, 2020-02)
    The high-resolution (⁠R∼48000⁠) optical spectrum of the B-type supergiant LS 5112, identified as the optical counterpart of the post-AGB candidate IRAS 18379–1707 is analysed. We report the detailed identifications of the ...
  • Application of convolutional neural networks for stellar spectral classification 
    Sharma, K; Kembhavi, Ajit; Kembhavi, Aniruddha; Sivarani, T; Abraham, Sheelu; Vaghmare, Kaustubh (Oxford University Press on behalf of the Royal Astronomical Society, 2020-01)
    Due to the ever-expanding volume of observed spectroscopic data from surveys such as SDSS and LAMOST, it has become important to apply artificial intelligence (AI) techniques for analysing stellar spectra to solve spectral ...

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