IIA Institutional Repository: Recent submissions

  • Strong near-infrared carbon in the type Ia supernova iPTF13ebh 
    Hsiao, E. Y; Burns, C. R; Contreras, C; Hoflich, P; Sand, D; Marion, G. H; Phillips, M. M; Stritzinger, M; Gonzalez-Gaitan, S; Mason, R. E; Folatelli, G; Parent, E; Gall, C; Amanullah, R; Anupama, G. C; Arcavi, I; Banerjee, D. P. K; Beletsky, Y; Blanc, G. A; Bloom, J. S; Brown, P. J; Campillay, A; Cao, Y; De Cia, A; Diamond, T; Freedman, W. L; Gonzalez, C; Goobar, A; Holmbo, S; Howell, D. A; Johansson, J; Kasliwal, M. M; Kirshner, R. P; Krisciunas, K; Kulkarni, S. R; Maguire, K; Milne, P. A; Morrell, N; Nugent, P. E; Ofek, E. O; Osip, D; Palunas, P; Perley, D. A; Persson, S. E; Piro, A. L; Rabus, M; Roth, M; Schiefelbein, J. M; Srivastav, S; Sullivan, M; Suntzeff, N. B; Surace, J; Wozniak, P. R; Yaron, O (EDP Sciences, 2015-06)
    We present near-infrared (NIR) time-series spectroscopy, as well as complementary ultraviolet (UV), optical, and NIR data, of the Type Ia supernova (SN Ia) iPTF13ebh, which was discovered within two days from the estimated ...
  • Latitude Distribution of Sunspots: Analysis Using Sunspot Data and a Dynamo Model 
    Mandal, Sudip; Karak, B. B; Banerjee, D (2017-12)
    In this paper, we explore the evolution of sunspot latitude distribution and explore its relations with the cycle strength. With the progress of the solar cycle, the distributions in two hemispheres from mid-latitudes ...
  • Star clusters in the magellanic clouds II. age-dating, classification, and spatio-temporal distribution of the SMC clusters 
    Nayak, P. K; Subramaniam, A; Choudhury, S; Sagar, R (EDP Sciences, 2018-08)
    Aims. We aim to estimate the age and reddening parameters of already identified star clusters within the Small Magellanic Cloud (SMC) in a consistent way using available photometric data, classify them based on their mass ...
  • The recent signs of total column ozone recovery over mid-latitudes: the effects of the montreal protocol mandate 
    Shantikumar, N. S; Vemareddy, P; Song, H. -J (Elsevier B.V, 2018-10)
    After successful implementation of the Montreal Protocol, total ozone column (TOC) has considerably increased since the mid 1990s. However, the recovery is weak and statistically non-significant particularly at low-latitudes ...
  • Hemispheric asymmetry of sunspot area in solar cycle 23 and rising phase of solar cycle 24: comparison of three data sets 
    Ravindra, B; Javaraiah, J (2015-08)
    Analysis of long-term solar data from different observatories is required to compare and confirm the various level of solar activity in depth. In this paper, we study the north–south asymmetry of monthly mean sunspot area ...
  • Signatures of the Impact of Flare-Ejected Plasma on the Photosphere of a Sunspot Light Bridge 
    Felipe, T; Collados, M; Khomenko, E; Rajaguru, S. P; Franz, M; Kuckein, C; Asensio Ramos, A (EDP Sciences, 2017-12)
    Aims. We investigate the properties of a sunspot light bridge, focusing on the changes produced by the impact of a plasma blob ejected from a C-class flare. Methods. We observed a sunspot in active region NOAA 12544 ...
  • A novel probe of ionized bubble shape and size statistics of the epoch of reionization using the contour Minkowski tensor 
    Akanksha, K; Pravabati, C; Appleby, S; Park, C (IOP Publishing, 2018-10)
    We employ the rank-2 contour Minkowski tensor in two dimensions to probe length and time scales of ionized bubbles during the epoch of reionization. We demonstrate that ionized bubbles are not circular, and hence not ...
  • ASASSN-14dq: A fast-declining type II-P Supernova in a low-luminosity host galaxy 
    Singh, A; Srivastav, S; Brajesh Kumar; Anupama, G. C; Sahu, D. K (Oxford University Press on behalf of the Royal Astronomical Society, 2018-10)
    Optical broadband (UBVRI) photometric and low-resolution spectroscopic observations of the Type II-P supernova (SN) ASASSN-14dq are presented. ASASSN-14dq exploded in a low-luminosity/metallicity host galaxy UGC 11860, the ...
  • Coronal magnetic field measurements using forbidden emission lines 
    Megha, A; Sampoorna, M; Nagendra, K. N; Sankarasubramanian, K (Cambridge University Press, 2018-02)
    The polarization measurement of coronal forbidden emission lines is the most promising method of determining the direction of magnetic fields in the corona. A classical theory for the forbidden lines was presented in Megha ...
  • On the Variability of the Solar Mean Magnetic Field: Contributions from Various Magnetic Features on the Surface of the Sun 
    Souvik Bose; Nagaraju, K (IOP Publishing, 2018-07-20)
    The solar mean magnetic field (SMMF) is referred to as the disk-averaged line-of-sight (LOS) magnetic field that also reflects the polarity imbalance of the magnetic field on the Sun. The origin of the SMMF has been debated ...
  • Onboard Automated CME Detection Algorithm for the Visible Emission Line Coronagraph on ADITYA-L1 
    Ritesh Patel; Amareswari, K; Pant, v; Banerjee, D; Sankarasubramanian, K; Amit Kumar (Springer, 2018-07)
    ADITYA-L1 is India’s first space mission to study the Sun from the Lagrange 1 position. The Visible Emission Line Coronagraph (VELC) is one of seven payloads on the ADITYA-L1 mission, which is scheduled to be launched ...
  • Trigger of Successive Filament Eruptions Observed by SDO and STEREO 
    Dhara, Sajal Kumar; Ravindra, B; Kumar, Pankaj; Banyal, R. K; Mathew, S. K; Joshi, B (Springer, 2017-02)
    Using multiwavelength observations from the Solar Dynamics Observatory (SDO) and the Solar Terrestrial Relations Observatory (STEREO), we investigate the mechanism of two successive eruptions (F1 and F2) of a filament in ...
  • Automated detection of coronal mass ejections in visible emission line coronagraph (VELC) on-board ADITYA-L1 
    Ritesh Patel; Amareswari, K; Pant, V; Banerjee, D; Sankarasubramanian, K (Cambridge University Press, 2018-02)
    An onboard automated coronal mass ejections (CMEs) detection algorithm has been developed for Visible Emission Line Coronagraph (VELC) onboard ADITYA-L1. The aim of this algorithm is to reduce the load on telemetry by ...
  • Century long study of sunspot activity using the Kodaikanal white-light data 
    Amareswari, K; Sankarasubramanian, K; Ravindra, B (Cambridge University Press, 2018-02)
    Sunspots are the most obvious and high contrast observable feature of solar magnetic activity in the photosphere. The morphological and kinematic behaviour of sunspots on the solar surface need to be studied over a long ...
  • An overview of science results obtained from Kodaikanal digitized white-light data archive: 1921-2011 
    Mandal, Sudip; Banerjee, D (Cambridge University Press, 2018-02)
    In this proceeding, we present a summary of the recent scientific results that have been derived using the newly digitized whit-light (WL) data obtained from the Kodaikanal Solar Observatory.
  • Probing the physics of narrow line regions in active galaxies. II. the siding spring southern seyfert spectroscopic snapshot survey (S7) 
    Dopita, M. A; Shastri, P; Davies, R; Kewley, L; Hampton, E; Scharwachter, J; Sutherland, R; Kharb, P; Jose, J; Bhatt, H. C; Ramya, S; Jin, C; Banfield, J; Zaw, I; Juneau, S; James, B; Shweta Srivastava (IOP Publishing, 2015-03)
    Here we describe the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7) and present results on 64 galaxies drawn from the first data release. The S7 uses the Wide Field Spectrograph mounted on the ANU 2.3 m ...
  • Long-lived atmospheric trace gases measurements in flask samples from three stations in India 
    Lin, X; Indira, N. K; Ramonet, M; Delmotte, M; Ciais, P; Bhatt, B. C; Reddy, M. V; Angchuk, D; Balakrishnan, S; Jorphail, S; Dorjai, T; Mahey, T. T; Patnaik, S; Begum, M; Brenninkmeijer, C; Durairaj, S; Kirubagaran, R; Schmidt, M; Swathi, P. S; Vinithkumar, N. V; Kwok, C. Y; Gaur, V. K (Published by Copernicus Publications on behalf of the European Geosciences Union, 2015-03)
    With the rapid growth in population and economic development, emissions of greenhouse gases (GHGs) from the Indian subcontinent have sharply increased during recent decades. However, evaluation of regional fluxes of GHGs ...
  • Variable stars in M37 
    Dar, A. A; Parihar, P. S; Saleh, P; Malik, M. A (IOP Publishing, 2018-12)
    The CCD photometric observations of open star cluster M37 (NGC 2099) were carried out up to a limiting magnitude of V ~ 20 in both B and V filters to search for variable stars using a 2k × 4k CCD and the 1.3 m telescope ...
  • Systematics of jets using multi-wavelength data 
    Shastri, P; Gomez, E. J; Gupta, M; Madejski, G (Cambridge University Press, 2015-03)
    We investigate the systematics of the properties of highly relativistic jets at multiple frequencies, including Fermi, and MOJAVE data. We test the hypothesis that the blazar divide constitutes a dichotomy. We also explore ...
  • A road map for the generation of a near-infrared guide star catalog for thirty meter telescope observations 
    Subramanian, S; Subramaniam, A; Sivarani, T; Simard, Luc; Anupama, G. C; Gillies, Kim; Ramaprakash, A. N; Reddy, B. E (Indian Academy of Sciences, 2016-09)
    The near-infrared instruments in the upcoming Thirty Meter Telescope (TMT) will be assisted by a multi conjugate Adaptive Optics (AO) system. For the efficient operation of the AO system, during observations, a near-infrared ...

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