IIAP Publications: Recent submissions

  • DarpanX: A python package for modeling X-ray reflectivity of multilayer mirrors 
    Mondal, B; Vadawale, S. V; Mithun, N. P. S; Vaishnava, C. S; Tiwari, N. K; Goyal, S. K; Panini, S. S; Navalkar, V; Karmakar, C; Patel, M. R; Upadhyay, R. B (Elsevier B.V, 2021-01)
    Multilayer X-ray mirrors consist of a coating of a large number of alternate layers of high Z and low Z materials with a typical thickness of 10–100 Å , on a suitable substrate. Such coatings play an important role in ...
  • Multi-band behaviour of the TeV blazar PG 1553+113 in optical range on diverse timescales 
    Agarwal, A; Mihov, B; Andruchow, I; Cellone, S. A; Anupama, G. C; Agrawal, V; Zola, S; Slavcheva, L; Slavcheva-Mihova, L; Ozdonmez, A; Ege, Ergun; Raj, A; Mammana, L; Zibecchi, L; Fernandez-Lajus, E (EDP Sciences, 2021-01)
    Context. The TeV BL Lac object PG 1553+113 is one of the primary candidates for a binary supermassive black hole system. Aims. We study the flux and spectral variability of PG 1553+113 on intra-night to long-term ...
  • Study of UV-bright stellar populations in the globular cluster NGC 1261 using Astrosat 
    Sharmila Rani; Pandey, G; Subramaniam, A; Snehalata Sahu; Kameswara Rao, N (Oxford University Press on behalf of the Royal Astronomical Society, 2021-02)
    We present UV photometry of the globular cluster NGC 1261 using images acquired with the Ultraviolet Imaging Telescope (UVIT) on board Astrosat. We performed point-spread function (PSF) photometry on four near-UV (NUV) and ...
  • Automated Detection of Accelerating Solar Eruptions Using Parabolic Hough Transform 
    Ritesh Patel; Pant, V; Priyanka Iyer; Banerjee, D; Mierla, M; West, M. J (Springer, 2021-02)
    Solar eruptions such as coronal mass ejections (CMEs) observed in the inner solar corona (up to 4 R⊙) show acceleration profiles that appear as parabolic ridges in height–time plots. Inspired by the white-light automated ...
  • A statistical study of solar radio Type III bursts and spaceweather implication 
    Ndacyayisenga, T; Uwamahoro, J; Raja, K. S; Monstein, C (Elsevier B.V, 2021-02-15)
    olar radio bursts (SRBs) are the signatures of various phenomenon that happen in the solar corona and interplanetary medium (IPM). In this article, we have studied occurrence of Type III bursts and their association with ...
  • Dynamics of accretion and winds in tidal disruption events 
    Mageshwaran, T; Mangalam, A (Elsevier B. V, 2021-02)
    We have constructed self-similar models of a time-dependent accretion disk in both sub and super-Eddington phases with wind outflows for tidal disruption events (TDEs). The physical input parameters are the black hole (BH) ...
  • Constraints on the epoch of dark matter formation from Milky Way satellites 
    Das, Subinoy; Nadler, E. O (The American Physical Society, 2021-02-15)
    A small fraction of thermalized dark radiation that transitions into cold dark matter (CDM) between big bang nucleosynthesis and matter-radiation equality can account for the entire dark matter relic density. Because of ...
  • Discovery of an M-type companion to the Herbig Ae Star V1787 Ori 
    Arun, R; Mathew, B; Sridharan, R; Manoj, P; Narang, M; Kartha, S. S; Maheswar, G (Oxford University Press on behalf of the Royal Astronomical Society, 2021-02)
    The intermediate-mass Herbig Ae star V1787 Ori is a member of the L1641 star-forming region in the Orion A molecular cloud. We report the detection of an M-type companion to V1787 Ori at a projected separation of 6.66 arcsec ...
  • The First Extensive Exploration of UV-bright Stars in the Globular Cluster NGC 2808 
    Deepthi, S. Prabhu; Subramaniam, A; Snehalata Sahu (IOP Publishing, 2021-02-10)
    In this study, we identified and characterized the hot and luminous UV-bright stars in the globular cluster NGC 2808. We combined data from the Ultra Violet Imaging Telescope (UVIT) on board the Indian space satellite AstroSat ...
  • Long-term (2008–2018) aerosol properties and radiative effect at high-altitude sites over western trans-Himalayas 
    Dumka, U. C; Shantikumar, N. S; Kaskaoutis, D. G; Madhavan, B. L; Song, H. -J; Angchuk, D; Jorphail, S (Elsevier B. V, 2020-09-10)
    Analysis of the climatology of aerosol properties is performed over Hanle (4500 m) and Merak (4310 m), two remote-background sites in the western trans-Himalayas, based on eleven years (2008–2018) of sun/sky radiometer ...
  • Optical and physical properties of aerosols during active fire events occurring in the Indo-Gangetic Plains: Implications for aerosol radiative forcing 
    Shantikumar, N. S; Dumka, U. C; Srivastava, A. K; Song, H. -J (Elsevier B. V, 2020-02-15)
    The climatological characteristics of biomass burning over the western Indo-Gangetic Plain (IGP) are examined during the post-monsoon (October-November) season from 2001-2018 using the Moderate resolution Imaging Spectrometer ...
  • Effect of lower stratospheric temperature on total ozone column (TOC) during the ozone depletion and recovery phases 
    Shantikumar, N. S; Vemareddy, P; Song, H. -J (Elsevier B. V, 2020-02-01)
    Using the Solar Back-scatter Ultraviolet merged ozone data during 1980–2016, the recovery of total ozone column (TOC) is examined in 5° wide latitude bands from 65°S to 65°N across the globe. Since the variability of TOC ...
  • Fast Iterative Techniques for Polarized Radiative Transfer in Spherically Symmetric Moving Media 
    Megha, A; Sampoorna, M; Nagendra, K. N; Anusha, L. S; Sankarasubramanian, K (IOP Publishing, 2020-11-01)
    For a more precise modeling of polarized spectral lines formed in extended and expanding stellar atmospheres, the solution of the radiative transfer equation for the Stokes vectors must be obtained in a spherical geometry ...
  • Fluorine detection in hot extreme helium stars 
    Bhowmick, A; Pandey, G; Lambert, D. L (Springer, 2020-12)
    The origin and evolution of hydrogen-deficient stars are not yet adequately understood. Their chemical peculiarities, along with hydrogen-deficiency, makes them stand out from the rest and sheds light on their possible ...
  • The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the BAO and growth rate of structure of the emission line galaxy sample from the anisotropic power spectrum between redshift 0.6 and 1.1 
    de Mattia, A; Ruhlmann-Kleider, V; Raichoor, A; Ross, A. J; Tamone, A; Zaho, Chang; Alam, S; Avila, S; Burtin, E; Bautista, J; Beutler, F; Brinkmann, J; Brownstein, J. R; Chapman, M. J; Chuang, C-H; Comparat, J; des Bourboux, Helion du Mas; Dawson, K. S; de la Macorra, A; Gil-Marin, H; Gonzalez-Perez, V; Gorgoni, C; Hou, Jiamin; Kong, Hui; Lin, Sicheng; Nadathur, S; Newman, J. A; Mueller, E.-M; Percival, W. J; Rezaie, M; Rossi, G; Schneider, D. P; Tiwari, P; Vivek, M; Wang, Yuting; Zhao, Gong-Bo (Oxford University Press on behalf of the Royal Astronomical Society, 2021-03)
    We analyse the large-scale clustering in Fourier space of emission line galaxies (ELG) from the Data Release 16 of the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey. The ELG sample contains ...
  • More insights into bar quenching: Multi-wavelength analysis of four barred galaxies 
    George, K; Joseph, P; Mondal, C; Subramanian, S; Subramaniam, A; Paul, K. T (EDP Sciences, 2020-12)
    The underlying nature of the process of star formation quenching in the central regions of barred disc galaxies that is due to the action of stellar bar is not fully understood. We present a multi-wavelength study of four ...
  • Recent advances in RV Tauri stars 
    Giridhar, S (Indian Academy of Sciences, 2020-12)
    The availability of multi-wavelength observations and parallaxes from the space missions and very comprehensive models of AGB evolution that include the accretion of matter from the circumbinary disc have strongly impacted ...
  • Investigation of the helium enhancement in a super lithium-rich giant HD 77361 
    Hema, B. P; Pandey, G (Indian Academy of Sciences, 2020-12)
    In this work, the helium-enhancement (He-enhancement) in the lithium-rich (Li-rich) K-giant HD 77361 is investigated using the strengths of the MgH band and the Mg I lines. The detailed abundance analysis and also the ...
  • A Search for Polarized Thermal Emission from Directly Imaged Exoplanets and Brown Dwarf Companions to Nearby Stars 
    Jensen-Clem, R; Millar-Blanchaer, M. A; van Holstein, R. G; Mawet, Dimitri; Graham, J; Sengupta, S; Marley, M. S; Snik, Frans; Vigan, A; Hinkley, S; de Boer, Jos; Girard, J. H; De Rosa, R. J; Bowler, B. P; Wiktorowicz, S. J; Perrin, M. D; Crepp, J. R; Macintosh, B (IOP Publishing, 2020-12)
    Aerosols in the atmospheres of cloudy gas giant exoplanets and brown dwarfs scatter and polarize these objects' thermal emission. If such an object has an oblate shape or nonuniform cloud distribution, the net degree of ...
  • Star Formation and Evolution of Blister-type H II Region Sh2-112 
    Panwar, N; Sharma, S; Ojha, D. K; Baug, T; Dewangan, L. K; Bhatt, B. C; Pandey, R (IOP Publishing, 2020-12-10)
    We report the observational findings of the Sh2-112 H ii region by using the multiwavelength data analysis ranging from optical to radio wavelengths. This region is powered by the massive O8V-type star BD +45 3216. The ...

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