IIA Institutional Repository: Recent submissions

  • Probing the Galactic s-process nucleosynthesis using barium stars 
    Goswami, A.; Jameela, S (Societe Royale des Sciences de Liege, 2019-10)
    The origin and evolution of neutron-capture elements in our Galaxy is poorly understood. In this work, we have attempted to understand the Galactic s-process nucleosynthesis using barium stars as probes. We have performed ...
  • Optical characterization and Radial velocity monitoring of Exoplanet and Eclipsing Binary candidates 
    Joshi, Y. C; De Cat, P; Panchal, A; Goswami, A; Lampens, P; Vermeylen, L; Maurya, J (Societe Royale des Sciences de Liege, 2019-10)
    In recent times, many new exoplanet and eclipsing binary candidates are reported, particularly from the archival data produced by the Kepler space mission destined to detect exoplanets in the Cygnus-Lyra region of the sky. ...
  • Magnetic activities on active solar-type stars 
    Naik, S; Pandey, J. C; Naik, S; Savanov, I. S; Raj, A. (Societe Royale des Sciences de Liege, 2019-10)
    We present results obtained from the studies of magnetic activities on four solar-type stars (F-type star KIC 6791060, K-type star LO Peg, and two M-type planet-hosting stars K2–33 and EPIC 211901114) by using optical ...
  • REMAP: Determination of the inner edge of the dust torus in AGN by measuring time delays 
    Mandal, A. K; Rakshit, S; Pal, I; Stalin, C. S; Sagar, R; Mathew, B. (Societe Royale des Sciences de Liege, 2019-10)
    Active galactic nuclei (AGN) are high luminosity sources powered by accretion of matter onto super-massive black holes (SMBHs) located at the centres of galaxies. According to the Unification model of AGN, the SMBH is ...
  • Scientific potential of the Indo-Belgian 3.6-m DOT in the field of Galactic Astronomy 
    Sagar, R; Kumar, B; Subramaniam, A (Societe Royale des Sciences de Liege, 2019-10)
    India and Belgium have jointly established two 4-meter class optical telescopes at Devasthal located in Nainital, India. After successful installation of the 3.6-m modern new technology Devasthal Optical Telescope (DOT) ...
  • Simultaneous longitudinal and transverse oscillations in filament threads after a failed eruption 
    Rakesh Mazumder; Vaibhav Pant; Manuel Luna; Dipankar Banerjee (EDP Sciences, 2019-11)
    Longitudinal and transverse oscillations are frequently observed in the solar prominences and / or filaments. These oscilla- tions are excited by a large-scale shock wave, impulsive flares at one leg of the filament ...
  • Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye 
    Wyrzykowski, L; Mroz, P; Rybicki, K. A; Gromadzki, M; Kolaczkowski, Z; Zielinski, M; Zielinski, P; Britavskiy, N; Gomboc, A; Sokolovsky, K; Hodgkin, S. T; Abe, L; Aldi, G. F; AlMannaei, A; Altavilla, G; Al Qasim, A; Anupama, G. C; Awiphan, S; Bachelet, E; Bakış, V; Baker, S; Bartlett, S; Bendjoya, P; Benson, K; Bikmaev, I. F; Birenbaum, G; Blagorodnova, N; Blanco-Cuaresma, S; Boeva, S; Bonanos, A. Z; Bozza, V; Bramich, D. M; Brun, I; Burenin, R. A; Burgaz, U; Butterley, T; Caines, H. E; Caton, D. B; Calchi Novati, S; Carrasco, J. M; Cassan, A; Cepas, V; Cropper, M; Chruslinska, M; Clementini, G; Clerici, A; Conti, D; Conti, M; Cross, S; Cusano, F; and 134 co-authors (EDP Sciences, 2020-01)
    Gaia16aye was a binary microlensing event discovered in the direction towards the northern Galactic disc and was one of the first microlensing events detected and alerted to by the Gaia space mission. Its light curve ...
  • Long term γ-ray variability of blazars 
    Rajput, Bhoomika; Stalin, C. S; Rakshit, S (EDP Sciences, 2020-02)
    We used the data from the Fermi Gamma-ray Space Telescope to characterise the γ-ray flux variability of blazars on month-like time scales. Our sample consists of 1120 blazars of which 481 are flat spectrum radio quasars ...
  • Disintegration of active asteroid P/2016 G1 (PANSTARRS) 
    Hainaut, O. R; Kleyna, J. T; Meech, K. J; Boslough, Mark; Micheli, Marco; Wainscoat, Richard; Dela Cruz, Marielle; Keane, J. V; Sahu, D. K; Bhatt, B. C (EDP Sciences, 2019-08)
    We report on the catastrophic disintegration of P/2016 G1 (PANSTARRS), an active asteroid, in April 2016. Deep images over three months show that the object is made up of a central concentration of fragments surrounded by ...
  • SIGNALS: I. Survey description 
    Rousseau-Nepton, L; Martin, R. P; Robert, C; Drissen, L; Amram, P; Prunet, S; Martin, T; Moumen, I; Adamo, A; Alarie, A; Barmby, P; Boselli, A; Bresolin, F; Bureau, M; Chemin, L; Fernandes, R. C; Combes, F; Crowder, C; Della Bruna, L; Duarte Puertas, S; Egusa, F; Epinat, B; Ksoll, V. F; Girard, M; Gomez Llanos, V; Gouliermis, D; Grasha, K; Higgs, C; Hlavacek-Larrondo, J; Ho, I.-T; Iglesias-Paramo, J; Joncas, G; Kam, Z. S; Karera, P; Kennicutt, R. C; Klessen, R. S; Lianou, S; Liu, L; Liu, Q; Luiz de Amorim, A; Lyman, J. D; Martel, H; Mazzilli-Ciraulo, B; McLeod, A. F; Melchior, A-L; Millan, I; Molla, M; Momose, R; Morisset, C; Pan, H.-A; Pati, A. K; and 13 co-authors (Oxford University Press on behalf of the Royal Astronomical Society, 2019-11)
    SIGNALS, the Star formation, Ionized Gas, and Nebular Abundances Legacy Survey, is a large observing programme designed to investigate massive star formation and H II regions in a sample of local extended galaxies. The ...
  • The intrinsic reddening of the Magellanic Clouds as traced by background galaxies – I. The bar and outskirts of the Small Magellanic Cloud 
    Bell, C. P. M.; Cioni, Maria-Rosa L; Wright, A. H; Rubele, Stefano; Nidever, David L; Tatton, Ben L; van Loon, Jacco Th; Ivanov, Valentin D; Subramanian, S; Oliveira, J. M; Grijs, Richard de; Pennock, Clara M; Choi, Yumi; Zaritsky, Dennis; Olsen, Knut; Niederhofer, Florian; Choudhury, S; Martinez-Delgado, David; Munoz, R. R (Oxford University Press on behalf of the Royal Astronomical Society, 2019-11)
    We present a method to map the total intrinsic reddening of a foreground extinguishing medium via the analysis of spectral energy distributions (SEDs) of background galaxies. In this pilot study, we implement this technique ...
  • Multiband optical variability of 3C 279 on diverse time-scales 
    Agarwal, A; Cellone, S. A; Andruchow, Ileana; Mammana, Luis; Mridweeka Singh; Anupama, G. C; Mihov, B; Raj, A; Slavcheva-Mihova, L; Ozdonmez, Aykut; Ege, Ergun (Oxford University Press on behalf of the Royal Astronomical Society, 2019-09)
    We have monitored the flat spectrum radio quasar, 3C 279, in the optical B, V, R, and I passbands from 2018 February to 2018 July for 24 nights, with a total of 716 frames, to study flux, colour, and spectral variability ...
  • Tracing the Dynamical Mass in Galaxy Disks Using H i Velocity Dispersion and Its Implications for the Dark Matter Distribution in Galaxies 
    Mousumi Das; McGaugh, S. S; Ianjamasimanana, Roger; Schombert, James; Dwarakanath, K. S (IOP Publishing, 2020-01-20)
    We present a method to derive the dynamical mass of face-on galaxy disks using their neutral hydrogen (H i) velocity dispersion (σ H i ). We have applied the method to nearby, gas-rich galaxies that have extended H i gas ...
  • Flash Ionization Signatures in the Type Ibn Supernova SN 2019uo 
    Gangopadhyay, A; Misra, K; Hiramatsu, D; Wang, Shan-Qin; Hosseinzadeh, G; Wang, Xiaofeng; Valenti, Stefano; Zhang, Jujia; Howel, D. A; Arcavi, Iair; Anupama, G. C; Burke, Jamison; Dastidar, Raya; Koichi Itagaki, Koichi; Kumar, Brajesh; Kumar, B; Li, Long; McCully, Curtis; Mo, Jun; Pandey, S. B; Pellegrino, Craig; Sa, Hanna; Sahu, D. K; Pankaj Sanwal; Singh, A; Singh, M; Zhang, Jicheng; Zhang, Tianmeng; Zhang, Xinhan (IOP Publishing, 2020-02-01)
    We present photometric and spectroscopic observations of the type Ibn supernova (SN) 2019uo, the second ever SN Ibn with flash ionization (He ii, C iii, N iii) features in its early spectra. SN 2019uo displays a rapid ...
  • Optical Transmission Spectra of Hot Jupiters: Effects of Scattering 
    Sengupta, S; Chakrabarty, Aritra; Tinetti, Giovanna (IOP Publishing, 2020-02-01)
    We present new grids of transmission spectra for hot Jupiters by solving the multiple-scattering radiative transfer equations with non-zero scattering albedo instead of using the Beer–Bouguer–Lambert law for the change in ...
  • Infrared properties of planetary nebulae with [WR] and wels central stars 
    Muthumariappan, C; Parthasarathy, M (Oxford University Press on behalf of the Royal Astronomical Society, 2020-03)
    We report the infrared (IR) properties of planetary nebulae (PNe) with Wolf–Rayet (WR) type and wels central stars known to date and compare them with the IR properties of a sample of PNe with H-rich central stars. We use ...
  • 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, 2019-10)
    The high-resolution ( R ∼ 48 000) 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 ...
  • Development of image motion compensation system for 1.3m telescope at Vainu Bappu Observatory 
    Sreekanth Reddy, V; Banyal, R. K; Sridharan, R; Aishwarya, S (IOP Publishing, 2020-01-01)
    We developed a tip-tilt system to compensate the turbulence induced image motion for the 1.3 m telescope at Vainu Bappu Observatory, at Kavalur. The instrument is designed to operate at the visible wavelength band (480−700 ...
  • Unravelling the unusually curved X-ray spectrum of RGB J0710 + 591 using AstroSat observations 
    Goswami, Pranjupriya; Sinha, Atreyee; Chandra, Sunil; Misra, Ranjeev; Chitnis, Varsha; Gogoi, Rupjyoti; Sahayanathan, Sunder; Stalin, C. S; Singh, K. P; Yada, J. S (Oxford University Press on behalf of the Royal Astronomical Society, 2020-02)
    We report the analysis of simultaneous multiwavelength data of the high-energy-peaked blazar RGB J0710 + 591 from the Large Area X-ray Proportional Counters, Soft X-ray focusing Telescope, and Ultraviolet Imaging ...
  • Unveiling Vela – variability of interstellar lines in the direction of the Vela supernova remnant – III. Na D and Ca II K 
    Kameswara Rao, N; Lambert, D. L; Reddy, A. B. S; Gupta, R; Muneer, S; Singh, H. P (Oxford University Press on behalf of the Royal Astronomical Society, 2020-03)
    High-resolution optical spectra were obtained in 2017–2019 with The Southern African Large Telescope of 15 stars in the direction of the Vela supernova remnant. Interstellar Ca II H & K and Na I D lines are discussed in ...

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