IIA Institutional Repository: Recent submissions

  • Effects of thermal emission on the transmission spectra of hot Jupiters 
    Chakrabarty, Aritra; Sengupta, S (IOP Publishing, 2020-07-20)
    The atmosphere on the dayside of a highly irradiated close-in gas giant (also known as a hot Jupiter) absorbs a significant part of the incident stellar radiation, which again gets re-emitted in the infrared wavelengths ...
  • Analysis of full-disc Ca II K spectroheliograms III. Plage area composite series covering 1892–2019 
    Chatzistergos, Theodosios; Ermolli, Ilaria; Krivova, Natalie A; Solanki, Sami K; Banerjee, D; Barata, Teresa; Belik, Marcel; Gafeira, Ricardo; Garcia, Adriana; Hanaoka, Yoichiro; Manjunath, H; Klimes, Jan; Korokhin, Viktor V; Lourenço, Ana; Malherbe, Jean-Marie; Marchenko, Gennady P; Peixinho, Nuno; Sakurai, Takashi; Tlatov, Andrey G (EDP Sciences, 2020-07)
    Context. Studies of long-term solar activity and variability require knowledge of the past evolution of the solar surface magnetism. The archives of full-disc Ca II K observations that have been performed more or less ...
  • The completed SDSS-IV extended baryon oscillation spectroscopic survey: BAO and RSD measurements from the anisotropic power spectrum of the quasar sample between redshift 0.8 and 2.2 
    Neveux, Richard; Burtin, Etienne; Mattia, Arnaud de; Smith, Alex; Ross, Ashley J; Hou, Jiamin; Bautista, Julian; Brinkmann, Jonathan; Chuang, Chia-Hsun; Dawson, Kyle S; Gil-Marin, Hector; Lyke, Brad W; Macorra, Axel de la; Bourboux, Helion du Mas des; Mohammad, Faizan G; Muller, Eva-Maria; Myers, Adam D; Newman, Jeffrey A; Percival, Will J; Rossi, Graziano; Schneider, Donald; Vivek, M; Zarrouk, Pauline; Zhao, Cheng; Zhao, Gong-Bo (Oxford University Press on behalf of the Royal Astronomical Society, 2020-11)
    We measure the clustering of quasars of the final data release (DR16) of eBOSS. The sample contains 343708 quasars between redshifts 0.8 ≤ z ≤ 2.2 over 4699deg2⁠. We calculate the Legendre multipoles (0,2,4) of the anisotropic ...
  • Alleviating the H0 and σ8 anomalies with a decaying dark matter model 
    Pandey, Kanhaiya L; Karwal, Tanvi; Das, Subinoy (IOP Publishing, 2020-07)
    The Hubble tension between the ΛCDM-model-dependent prediction of the current expansion rate H0 using Planck data and direct, model-independent measurements in the local universe from the SH0ES collaboration disagree at ...
  • A statistical study of plasmoids associated with a post-CME current sheet 
    Ritesh Patel; Pant, Vaibhav; Chandrashekhar, K; Banerjee, D (EDP Sciences, 2020-12)
    Context. Coronal mass ejections (CMEs) are often observed to be accompanied by flare, current sheets, and plasmoids/plasma blobs. 2D and 3D numerical simulations and observations reported plasmoids moving upward as well ...
  • Lithium in the Galaxy: current status and contribution from the low-mass giants? 
    Deepak; Reddy, B. E (Societa Astronomica Italiana, 2020)
    We discuss the evolution of Li in the Galaxy based on a large sample of dwarfs and giants collected from the cross-match of the Gaia and GALAH surveys. Data spans a wide range in metallicity and cover various Galactic ...
  • NGC 6712: the variable star population of a tidally disrupted globular cluster 
    Deras, D; Arellano Ferro, A; Lazaro, C; Bustos Fierro, I. H; Calderon, J. H; Muneer, S; Giridhar, S (Oxford University Press on behalf of the Royal Astronomical Society, 2020-04)
    We present an analysis of VI CCD time-series photometry of globular cluster NGC 6712. Our main goal is to study the variable star population as indicators of the cluster mean physical parameters. We employed the Fourier ...
  • Correlation between optical and γ -ray flux variations in bright flat spectrum radio quasars 
    Rajput, Bhoomika; Stalin, C. S; Sahayanathan, S (Oxford University Press on behalf of the Royal Astronomical Society, 2020-11)
    Blazars are known to show flux variations over a range of energies from low-energy radio to high-energy γ-rays. Cross-correlation analysis of the optical and γ-ray light curves in blazars shows that flux variations are ...
  • Recurring homologous solar eruptions in NOAA AR 11429 
    Dhakal, Suman K; Zhang, Jie; Vemareddy, P; Nishu Karna (IOP Publishing, 2020-09-20)
    We present the study of three homologous solar eruptions from NOAA active region (AR) 11429 over four days. This large and complex AR is divided into two relatively simple subregions: northeast (NE) and southwest (SW). ...
  • Spectral properties of quasars from sloan digital sky survey data release 14: the catalog 
    Rakshit, S; Stalin, C. S; Kotilainen, J (IOP Publishing, 2020-07)
    We present measurements of the spectral properties for a total of 526,265 quasars, out of which 63% have a continuum signal-to-noise ratio > 3 pixel−1, selected from the fourteenth data release of the Sloan Digital Sky ...
  • Low-frequency radio observations of the “quiet” corona during the descending phase of sunspot cycle 24 
    Ramesh, R; Anshu Kumari; Kathiravan, C; Ketaki, D; Rajesh, M; Vrunda, M (The American Geophysical Union, 2020-09-28)
    We carried out a statistical study of the “quiet” solar corona during the descending phase of the Sunspot Cycle 24 (i.e., January 2015 to May 2019) using data obtained with the Gauribidanur RAdioheliograPH (GRAPH) at 53 ...
  • Photometric and spectroscopic evolution of the peculiar Type IIn SN 2012ab 
    Gangopadhyay, A; Turatto, Massimo; Benetti, Stefano; Misra, K; Brajesh Kumar; Cappellaro, Enrico; Pastorello, Andrea; Tomasella, Lina; Vanni, Sabrina; Fiore, Achille; Morales-Garoffolo, A; Elias-Rosa, Nancy; Singh, Mridweeka; Dastidar, R; Ochner, Paolo; Tartaglia, Leonardo; Brijesh Kumar; Pandey, S. B (Oxford University Press on behalf of the Royal Astronomical Society, 2020-11)
    We present an extensive (∼1200 d) photometric and spectroscopic monitoring of the Type IIn supernova (SN) 2012ab. After a rapid initial rise leading to a bright maximum (MR = −19.39 mag), the light curves show a plateau ...
  • The completed SDSS-IV extended baryon oscillation spectroscopic survey: large-scale structure catalogues for cosmological analysis 
    Ross, Ashley J; Bautista, Julian; Tojeiro, Rita; Alam, Shadab; Bailey, Stephen; Burtin, Etienne; Comparat, Johan; Dawson, Kyle S; Mattia, Arnaud de; Bourboux, Helion du Mas des; Gil-Marın, Hector; Hou, Jiamin; Kong, Hui; Lyke, Brad W; Mohammad, Faizan G; Moustakas, John; Mueller, Eva-Maria; Myers, Adam D; Percival, Will J; Raichoor, Anand; Rezaie, Mehdi; Seo, Hee-Jong; Smith, Alex; Tinker, Jeremy L; Zarrouk, Pauline; Zhao, Cheng; Zhao, Gong-Bo; Bizyaev, Dmitry; Brinkmann, Jonathan; Brownstein, Joel R; Rosell, Aurelio Carnero; Chabanier, Solene; Choi, Peter D; Chuang, Chia-Hsun; Cruz-Gonzalez, Irene; Macorra, Axel de la; Torre, Sylvain de la; Escoffier, Stephanie; Fromenteau, Sebastien; Higley, Alexandra; Jullo, Eric; Kneib, Jean-Paul; McLane, Jacob N; Munoz-Guti ˜ errez, Andrea; Neveux, Richard; Newman, Jeffrey A; Nitschelm, Christian; Palanque-Delabrouille, Nathalie; Paviot, Romain; Pullen, Anthony R; Rossi, Graziano; Ruhlmann-Kleider, Vanina; Schneider, Donald P; Magana, Mariana Vargas; Vivek, M; Zhang, Yucheng (Oxford University Press on behalf of the Royal Astronomical Society, 2020-10)
    We present large-scale structure catalogues from the completed extended Baryon Oscillation Spectroscopic Survey (eBOSS). Derived from Sloan Digital Sky Survey (SDSS) IV Data Release 16 (DR16), these catalogues provide the ...
  • The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the BAO and growth rate of structure of the luminous red galaxy sample from the anisotropic power spectrum between redshifts 0.6 and 1.0 
    Gil-Marin, Hector; Bautista, Julian E; Paviot, Romain; Vargas-Magana, Mariana; de la Torre, Sylvain; Fromenteau, Sebastien; Alam, Shadab; Avila, Santiago; Burtin, Etienne; Chuang, Chia-Hsun; Dawson, Kyle S; Hou, Jiamin; de Mattia, Arnaud; Mohammad, Faizan G; Muller, Eva-Maria; Nadathur, Seshadri; Neveux, Richard; Percival, Will J; Raichoor, Anand; Rezaie, Mehdi; Ross, Ashley J; Rossi, Graziano; Ruhlmann-Kleider, Vanina; Smith, Alex; Tamone, Amelie; Tinker, Jeremy L; Tojeiro, Rita; Wang, Yuting; Zhao, Gong-Bo; Zhao, Cheng; Brinkmann, Jonathan; Brownstein, Joel R; Choi, Peter D; Escoffier, Stephanie; de la Macorra, Axel; Moon, Jeongin; Newman, Jeffrey A; Schneider, Donald P; Seo, Hee-Jong; Vivek, M (Oxford University Press on behalf of the Royal Astronomical Society, 2020-10)
    We analyse the clustering of the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey Data Release 16 luminous red galaxy sample (DR16 eBOSS LRG) in combination with the high redshift tail of the ...
  • Long-term optical and infrared variability characteristics of Fermi blazars 
    Safna, P. Z; Stalin, C. S; Rakshit, S; Mathew, Blesson (Oxford University Press on behalf of the Royal Astronomical Society, 2020-11)
    We present long-term optical and near-infrared flux variability analysis of 37 blazars detected in the γ-ray band by the Fermi Gamma-Ray Space Telescope. Among them, 30 are flat spectrum radio quasars (FSRQs) and 7 are BL ...
  • Signatures of untwisting magnetic field in a small emerging bipole in the solar photosphere 
    Sangeetha, C. R; Tripathi, Durgesh; Rajaguru, S. P (IOP Publishing, 2020-05-20)
    We perform a study of fluid motions and its temporal evolution in and around a small bipolar emerging flux region using observations made by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory. We ...
  • i-Process nucleosynthesis: Observational evidences from CEMP stars 
    Goswami, P. P; Goswami, A (Indian Academy of Sciences, 2020-12)
    The surface chemical compositions of a large fraction of carbon-enhanced metal-poor (CEMP) stars, the so-called CEMP-r/s stars, are known to exhibit enhancement of both s-process and r-process elements. For these stars, ...
  • HCT/HESP study of two carbon stars from the LAMOST survey 
    Shejeelammal, J; Goswami, A; Shi, Jianrong (Oxford University Press on behalf of the Royal Astronomical Society, 2021-03)
    Carbon stars, enhanced in carbon and neutron-capture elements, provide a wealth of information about the nucleosynthesis history of the Galaxy. In this work, we present the first ever detailed abundance analysis of the ...
  • On two Seventeenth century Persian paintings depicting comets or fireballs: a correction 
    Kapoor, R. C (National Astronomical Research Institute of Thailand, 2020-12)
    In a recent issue of the Journal of Astronomical History and Heritage I looked into two seventeenth century Persian paintings depicting tailed objects (comets or possibly fireballs) in the sky (Kapoor, 2019). One of these, ...
  • Comet tales from India: the Great September Comet of 1882 (C/1882 R1) 
    Kapoor, R. C (National Astronomical Research Institute of Thailand, 2020-08)
    This paper brings together India-centric accounts of the Great Comet that appeared in 1882. It grew to be the most magnificent one seen since the Great Comet of 1843, and was observed from throughout the Indian Subcontinent. ...

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