IIAP Publications: Recent submissions

  • Authenticating the presence of a relativistic massive black hole binary in OJ 287 using Its general relativity centenary flare: improved orbital parameters 
    Dey, L; Valtonen, M. J; Gopakumar, A; Zola, S; Hudec, R; Pihajoki, P; Ciprini, S; Matsumoto, K; Sadakane, K; Kidger, M; Nilsson, K; Mikkola, S; Sillanpaa, A; Takalo, L. O; Lehto, H. J; Berdyugin, A; Piirola, V; Jermak, H; Baliyan, K. S; Pursimo, T; Caton, D. B; Alicavus, F; Baransky, A; Blay, P; Boumis, P; Boyd, D; Campas Torrent, M; Campos, F; Carrillo Gomez, J; Chandra, S; Chavushyan, V; Dalessio, J; Debski, B; Drozdz, M; Er, H; Erdem, A; Escartin Perez, A; Fallah Ramazani, V; Filippenko, A. V; Gafton, E; Ganesh, S; Garcia, F; Gazeas, K; Godunova, V; Gomez Pinilla, F; Maheswar, G; Haislip, J. B; Harmanen, J; Hurst, G; Janik, J; Jelinek, M; Joshi, A; Kagitani, M; Karjalainen, R; Kaur, N; Keel, W. C; Kouprianov, V. V; Kundera, T; Kurowski, S; Kvammen, A; LaCluyze, A. P; Lee, B. C; Liakos, A; Lindfors, E; Lozano de Haro, J; Mugrauer, M; Naves Nogues, R; Neely, A. W; Nelson, R. H; Ogloza, W; Okano, S; Pajdosz-Smierciak, U; Pandey, J. C; Perri, M; Poyner, G; Provencal, J; Raj, A; and 27 co-authors (IOP Publishing, 2018-10-10)
    Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission of gravitational waves (GWs). We show that observations associated with the ...
  • Gravity of accelerations on quantum scales and its consequences 
    Sivaram, C; Arun, K; Kiren, O. V; Sreenath, B. N (Hadronic Press Inc, 2015-12)
    Gravity stands apart from other fundamental interactions in that it is locally equivalent to an accelerated frame and can be transformed away. Again it is indistinguishable from the geometry of space-time (which is an arena ...
  • Science at high-altitude sites of ARIES-astrophysics and atmospheric sciences 
    Sagar, R; Naja, M; Maheswar, G; Srivastava, A. K (Indian National Science Academy, 2014-11)
    In this article we discuss various frontline research activities those are being carried out in the fields of Astronomy and Astrophysics and Atmospheric Sciences at Aryabhatta Research Institute of Observational Sciences ...
  • Association of calcium network bright points with underneath photospheric magnetic patches 
    Narang, Nancy; Banerjee, D; Chandrashekhar, K; Pant, V (Springer, 2019-04)
    Recent dedicated Hinode polar region campaigns revealed the presence of concentrated kilogauss patches of the magnetic field in the polar regions of the Sun, which are also shown to be correlated with facular bright points ...
  • Temperate Earth-sized planets transiting a nearby ultracool dwarf star 
    Gillon, M; Jehin, E; Lederer, S. M; Delrez, L; De Wit, J; Burdanov, A; Van Grootel, V; Burgasser, A. J; Triaud, A. H. M. J; Opitom, C; Demory, Brice-Olivier; Sahu, D. (Nature Publishing Group, 2016-05)
    Star-like objects with effective temperatures of less than 2,700 kelvin are referred to as ‘ultracool dwarfs’1. This heterogeneous group includes stars of extremely low mass as well as brown dwarfs (substellar objects ...
  • Degree of electric current neutralization and the activity in solar active regions 
    Vemareddy, P (Oxford University Press on behalf of the Royal Astronomical Society, 2019-07)
    Using time-sequence vector magnetic field observation from Helioseismic and Magnetic Imager, we examined the connection of non-neutralized currents and the observed activity in 20 solar active regions (ARs). The net current ...
  • RR Lyrae stars and the horizontal branch of NGC 5904 (M5) 
    Ferro, A. A; Luna, A; Bramich, D. M; Giridhar, S; Ahumada, J. A; Muneer, S (Springer, 2016-05)
    We report the distance and [Fe/H] value for the globular cluster NGC 5904 (M5) derived from the Fourier decomposition of the light curves of selected RRab and RRc stars. The aim in doing this was to bring these ...
  • Overview of the DESI legacy imaging surveys 
    Arjun Dey; Schlegel, David J; Lang, Dustin; Blum, Robert; Kaylan Burleigh; Fan, Xiaohui; Findlay, Joseph R; Finkbeiner, Doug; Herrera, David; Juneau, Stephanie; Landriau, Martin; Levi, Michael; McGreer, Ian; Meisner, Aaron; Myers, Adam D; Moustakas, John; Nugent, Peter; Patej, Anna; Schlafly, Edward F; Walker, Alistair R; Valdes, Francisco; Weaver, Benjamin A; Yeche, Christophe; Zou, Hu; Zhou, Xu; Abaresh, Behzad; Abbott, T. M. C; Abolfathi, Bela; Aguilera, C; Alam, Shadab; Allen, Lori; Alvarez, A; Annis, James; Ansarinejad, Behzad; Aubert, Marie; Beechert, Jacqueline; Bell, Eric F; BenZvi, Segev Y; Beutler, Florian; Bielby, Richard M; Bolton, Adam S; Briceno, Cesar; Buckley-Geer, Elizabeth J; Butler, Karen; Calamida, Annalisa; Carlberg, Raymond G; Carter, Paul; Casas, Ricard; Castander, Francisco J; Choi, Yumi; Comparat, Johan; Cukanovaite, Elena; Delubac, Timothee; DeVries, Kaitlin; Dey, Sharmila; Dhungana, Govinda; Dickinson, Mark; Ding, Zhejie; Donaldson, John B; Duan, Yutong; Duckworth, Christopher J; Eftekharzadeh, Sarah; Eisenstein, Daniel J; Etourneau, Thomas; Fagrelius, Parker A; Farihi, Jay; Fitzpatrick, Mike; Font-Ribera, Andreu; Fulmer, Leah; Gansicke, Boris T; Gaztanaga, Enrique; George, K; and 89 co-authors (IOP Publishing, 2019-05)
    The DESI Legacy Imaging Surveys (http://legacysurvey.org/) are a combination of three public projects (the Dark Energy Camera Legacy Survey, the Beijing–Arizona Sky Survey, and the Mayall z-band Legacy Survey) that will ...
  • Detection of a white dwarf companion to a blue straggler star in the outskirts of globular cluster NGC 5466 with the ultraviolet imaging telescope (UVIT) 
    Snehalata Sahu; Subramaniam, A; Simunovic, Mirko; Postma, J; Cote, Patrick; Kameswara Rao, N; Geller, Aaron M; Leigh, Nathan; Shara, Michael; Puzia, Thomas H; Stetson, Peter B (IOP Publishing, 2019-05-01)
    We report the discovery of a hot white dwarf (WD) companion to a blue straggler star (BSS) in the globular cluster (GC) NGC 5466, based on observations from the Ultra-Violet Imaging Telescope (UVIT) on board AstroSat. ...
  • Observational properties of a type Ib supernova MASTER OT J120451.50+265946.6 in NGC 4080 
    Singh, M; Misra, K; Sahu, D. K; Dastidar, R; Gangopadhyay, A; Srivastav, S; Anupama, G. C; Bose, S; Lipunov, V; Chakradhari, N. K; Brajesh Kumar; Pandey, S. B; Gorbovskoy, E; Balanutsa, P (Oxford University Press on behalf of the Royal Astronomical Society, 2019-06)
    MASTER OT J120451.50+265946.6 (M12045), discovered by the MASTER Global Robotic Net, is a Type Ib supernova (SN) that exploded in NGC 4080. We present the BVRI photometric and spectroscopic observations up to ∼250 d since ...
  • The hot γ Doradus and Maia stars 
    Balona, L. A; Engelbrecht, C. A; Joshi, Y. C; Joshi, S; Sharma, K; Semenko, E; Pandey, G; Chakradhari, N. K; Mkrtichian, D; Hema, B. P; Nemec, J. M (Oxford University Press on behalf of the Royal Astronomical Society, 2016-09)
    The hot γ Doradus stars have multiple low frequencies characteristic of γ Dor or SPB variables, but are located between the red edge of the SPB and the blue edge of the γ Dor instability strips where all low-frequency ...
  • Cosmological magnetic braking and the formation of high-redshift, super-massive black holes 
    Pandey, Kanhaiya L; Sethi, Shiv K; Ratra, Bharat (Oxford University Press on behalf of the Royal Astronomical Society, 2019-06)
    We study the effect of magnetic braking due to a primordial magnetic field in the context of the formation of massive (≳104M⊙) direct-collapse black holes (DCBHs) at high redshifts. Under the assumption of axial symmetry, ...
  • Temporal correlation between the optical and γ-ray flux variations in the blazar 3C 454.3 
    Rajput, Bhoomika; Stalin, C. S; Sahayanathan, S; Rakshit, S; Amit Kumar Mandal (Oxford University Press on behalf of the Royal Astronomical Society, 2019-06)
    Blazars show optical and γ-ray flux variations that are generally correlated, although there are exceptions. Here we present anomalous behaviour seen in the blazar 3C 454.3 based on an analysis of quasi-simultaneous data ...
  • Cosmic evolution of AGN using self-consistent black hole energetics 
    Mangalam, A (Astronomical Society of India, 2015)
    We consider a model that takes into account the mass and spin accreted by the hole and the angular momentum torque due to an electrodynamical jet. The spin evolution is calculated with and without accretion; if the accretion ...
  • High-resolution, high-sensitivity, ground-based solar spectropolarimetry with a new fast imaging polarimeter: I .Prototype characterization 
    Iglesias, F. A; Feller, A; Nagaraju, K; Solanki, S. K (EDP Sciences, 2016-06)
    Remote sensing of weak and small-scale solar magnetic fields is of utmost relevance when attempting to respond to a number of important open questions in solar physics. This requires the acquisition of spectropolarimetric ...
  • Tracking galaxy evolution through low-frequency radio continuum observations using SKA and citizen-science research using multi-wavelength data 
    Hota, A; Konar, C; Stalin, C. S; Vaddi, Sravani; Mohanty, Pradeepta K; Dabhade, Pratik; Arun, Sai; Bhoga, Dharmik; Rajoria, Megha; Sethi, Sagar (Indian Academy of Sciences, 2016-12)
    We present a brief review of progress in the understanding of general spiral and elliptical galaxies, through merger, star formation and AGN activities. With reference to case studies performed with the GMRT, we highlight ...
  • Silicon depletion in the interstellar medium 
    Haris, U; Parvathi, V. S; Gudennavar, S. B; Bubbly, S. G; Murthy, J; Sofia, U. J (IOP Publishing, 2016-07)
    We report interstellar silicon ( Si ) depletion and dust-phase column densities of Si along 131 Galactic sight lines using archival observations. The data were corrected for differences in the assumed oscillator ...
  • Probing magnetic fields with square kilometre array and its precursors 
    Roy, S; Sur, Sharanya; Subramanian, K; Mangalam, A; Seshadri, T. R; Chand, H (Indian Academy of Sciences, 2016-12)
    Origin of magnetic fields, its structure and effects on dynamical processes in stars to galaxies are not well understood. Lack of a direct probe has remained a problem for its study. The first phase of Square Kilometre ...
  • Solar wind associated with near equatorial coronal Hole 
    Hegde, M; Hiremath, K. M; Doddamani, V. H; Gurumath, S. R (2015-09)
    Present study probes temporal changes in the area and radiative flux of near equatorial coronal hole associated with solar wind parameters such as wind speed, density, magnetic field and temperature. Using high temporal ...
  • A new study of the variable star population in the Hercules globular cluster (M13; NGC 6205) 
    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, 2019-06)
    We present the results from VI CCD time-series photometry of the globular cluster M13 (NGC 6205). From the Fourier decomposition of the light curves of RRab and RRc stars we found an average metallicity of [Fe/H]zw = −1.58 ...

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