IIA Institutional Repository: Recent submissions

  • Polarized line formation with incomplete Paschen-Back effect and partial frequency redistribution 
    Sampoorna, M; Nagendra, K. N; Sowmya, K; Stenflo, J. O; Anusha, L. S (Astronomical Society of the Pacific, 2019-07)
    Quantum interference between the hyperfine structure states is known to depolarize the cores of some of the lines in the linearly polarized spectrum of the Sun (the Second Solar Spectrum). The presence of external magnetic ...
  • Polarized line formation in spherically symmetric expanding atmospheres 
    Megha, A; Sampoorna, M; Nagendra, K. N; Anusha, L. S; Sankarasubramanian, K (Astronomical Society of the Pacific, 2019-07)
    We consider the problem of polarized line formation in the spherically symmetric expanding atmospheres. The velocity fields in line forming regions produce Doppler shift, aberration of photons and also gives rise to ...
  • Precise photometric transit follow-up observations of five close-in exoplanets: update on their physical properties 
    Aritra Chakrabarty; Sengupta, S (IOP Publishing, 2019-07)
    We report the results of the high-precision photometric follow-up observations of five transiting hot Jupiters, WASP-33b, WASP-50b, WASP-12b, HATS-18b, and HAT-P-36b. The observations are made from the 2 m Himalayan Chandra ...
  • On the observational behaviour of the highly polarized Type IIn supernova SN 2017hcc 
    Brajesh Kumar; Eswaraiah, C; Singh, A; Sahu, D. K; Anupama, G. C; Kawabata, K. S; Yamanaka, Masayuki; Otsubo, Ikki; Pandey, S. B; Nakaoka, Tatsuya; Kawabata, Miho; Aryan, Amar; Akitaya, Hiroshi (Oxford University Press on behalf of the Royal Astronomical Society, 2019-09)
    We present the results based on photometric (Swift UVOT), broad-band polarimetric (V and Rbands) and optical spectroscopic observations of the Type IIn supernova (SN) 2017hcc. Our study is supplemented with spectropolarimetric ...
  • GASP XVIII: star formation quenching due to AGN feedback in the central region of a jellyfish galaxy 
    George, K; Poggianti, B. M; Bellhouse, C; Radovich, M; Fritz, J; Paladino, R; Bettoni, R D; Jaff, Y; Moretti, A; Gullieuszik, M; Vulcani, B; Fasano, G; Stalin, C. S; Subramaniam, A; Tandon, S. N (Oxford University Press on behalf of the Royal Astronomical Society, 2019-08)
    We report evidence for star formation quenching in the central 8.6 kpc region of the jellyfish galaxy JO201 that hosts an active galactic nucleus (AGN), while undergoing strong ram-pressure stripping. The ultraviolet imaging ...
  • MHD Waves in Coronal Holes 
    Banerjee, D; Krishna Prasad, S (John Wiley & Sons, Inc., 2015-05)
    Coronal holes are the dark patches in the solar corona associated with relatively cool, less dense plasma and unipolar fields. The fast component of the solar wind emanates from these regions. Several observations ...
  • Multi-messenger Observations of a Binary Neutron Star Merger 
    Abbott, B. P; LIGO Scientific Collaboration; Fermi GBM||INTEGRAL; IceCube Collaboration; AstroSat Cadmium Zinc Telluride Imager Team; IPN Collaboration; The Insight-HXMT Collaboration; ANTARES Collaboration; The Swift Collaboration; AGILE Team; The 1M2H Team; The Dark Energy Camera GW-EM Collaboration and the DES Collaboration; The DLT40 Collaboration; GRAWITA: GRAvitational Wave Inaf TeAm; The Fermi Large Area Telescope Collaboration; ATCA: Australia Telescope Compact Array; ASKAP: Australian SKA Pathfinder; Las Cumbres Observatory Group; OzGrav; DWF ( Deeper, Wider, Faster Program ); AST3; CAASTRO Collaborations; The VINROUGE Collaboration; MASTER Collaboration; J-GEM; GROWTH; JAGWAR; Caltech- NRAO; TTU-NRAO; NuSTAR Collaborations; Pan-STARRS; The MAXI Team; TZAC onsortium; KU Collaboration; Nordic Optical Telescope; ePESSTO; GROND; Texas Tech University; SALT Group; TOROS: Transient Robotic Observatory of the South Collaboration; The BOOTES Collaboration; MWA: Murchison Widefield Array; The CALET Collaboration; IKI-GW Follow-up Collaboration; H.E.S.S. Collaboration; LOFAR Collaboration; LWA: Long Wavelength Array; HAWC Collaboration; The Pierre Auger Collaboration; ALMA Collaboration; Euro VLBI Team; Pi of the Sky Collaboration; The Chandra Team at McGill University; DFN: Desert Fireball Network; ATLASx; High Time Resolution Universe Survey; RIMAS and RATIR; SKA South Africa / MeerKAT; Pavana, M; Anupama, G. C (IOP Publishing, 2017-10)
    On 2017 August 17 a binary neutron star coalescence candidate ( later designated GW170817 ) with merger time 12:41:04 UTC was observed through gra vitational waves by the Advanced LIG O and Advanced Virgo detectors. ...
  • Polarized line scattering theory with applications in astrophysical radiative transfer: a historical perspective 
    Nagendra, K. N (Astronomical Society of the Pacific, 2019-07)
    Ivan Hubeny did fundamental work in the theory of partial frequency redistribution (PFR) and radiative transfer (RT). One of the most elegant works is the "theory of generalized redistribution functions (GRFs)" for ...
  • The 3.6 metre Devasthal optical telescope: from inception to realization 
    Sagar, R; Kumar, Brijesh; Omar, A (Indian Academy of Sciences, 2019-08-10)
    India’s largest 3.6 metre Devasthal Optical Telescope (DOT) was commissioned in 2016, though the idea of building it germinated way back in 1976. This article provides research accounts as well as glimpses of its nearly ...
  • Outlying Hα emitters in SDSS IV MaNGA 
    Bait, O; Wadadekar, Y; Barway, Sudhanshu (Oxford University Press on behalf of the Royal Astronomical Society, 2019-05)
    We have carried out a systematic search for outlying Hα emitters in the entire Data Release 14 of the Sloan Digital Sky Survey (SDSS) IV Mapping Nearby Galaxies at APO (MaNGA) survey. We have discovered six outlying Hα ...
  • Near UV imager with an MCP-based photon counting detector 
    Ambily, S; Mathew, J; Mayuresh, Sarpotdar; Sreejith, A. G; Nirmal, K; Prakash, A; Safonova, M; Murthy, J (SPIE-The International Society for Optical Engineering, 2016-07)
    We are developing a compact UV Imager using light weight components, that can be own on a small CubeSat or a balloon platform. The system has a lens-based optics that can provide an aberration-free image over a wide field ...
  • The fast, luminous ultraviolet transient AT2018cow: extreme supernova, or disruption of a star by an intermediate-mass black hole? 
    Perley, D. A; Mazzali, P. A; Yan, Lin|; Cenko, S. Bradley; Gezari, Suvi; Taggart, Kirsty; Blagorodnova, Nadia; Fremling, Christoffer; Mockler, Brenna; Singh, A; Tominaga, Nozomu; Tanaka, Masaomi; Watson, Alan M; Ahumada, Tomas; Anupama, G. C; Ashall, Chris; Becerra, Rosa L; Bersier, David; Bhalerao, Varun; Bloom, Joshua S; Butler, Nathaniel R; Copperwheat, Chris; Coughlin, Michael W; De, Kishalay; Drake, Andrew J; Duev, Dmitry A; Frederick, Sara; Gonzalez, J. J; Goobar, Ariel; Heida, Marianne; Ho, Anna Y. Q; Horst, John; Hung, Tiara; Itoh, Ryosuke; Jencson, Jacob E; Kasliwal, Mansi M; Kawai, Nobuyuki; Khanam, Tanazza; Kulkarni, Shrinivas R; Brajesh Kumar; Harsh Kumar; Kutyrev, Alexander S; Lee, William H; Maeda, Keiichi; Ashish Mahabal; Murata, Katsuhiro L; Neill, James D; Ngeow, Chow-Choong; Penprase, Bryan; Pian, Elena; Quimby, Robert; Ramirez-Ruiz, Enrico; Richer, Michael G; Roman-Zuniga, Carlos G; Sahu, D. K; Srivastav, S; 9 others (Oxford University Press on behalf of the Royal Astronomical Society, 2019-03)
    Wide-field optical surveys have begun to uncover large samples of fast (trise ≲ 5 d), luminous (Mpeak < −18), blue transients. While commonly attributed to the breakout of a supernova shock into a dense wind, the great ...
  • An ultraviolet imager to study bright UV sources 
    Mathew, J; Prakash, A; Mayuresh, Sarpotdar; Sreejith, A. G; Safonova, M; Murthy, J (SPIE-The International Society for Optical Engineering, 2016-07)
    We have designed and developed a compact ultraviolet imaging payload to y on a range of possible platforms such as high altitude balloon experiments, cubesats, space missions, etc. The primary science goals are to study ...
  • Optical and NIR observations of the nearby type Ia supernova SN 2014J 
    Srivastav, S; Ninan, J. P; Kumar, B; Anupama, G. C; Sahu, D. K; Ojha, D. K; Prabhu, T. P (Oxford University Press on behalf of the Royal Astronomical Society, 2016-03)
    Optical and NIR observations of the Type Ia supernova SN 2014J in M82 are presented. The observed light curves are found to be similar to normal Type Ia supernovae (SNe Ia), with a decline rate parameter m 15 ( B ...
  • Very long baseline interferometry with the SKA 
    Paragi, Z; Godfrey, L; Reynolds, C; Rioja, M. J; Deller, A; Zhang, B; Gurvits, L; Bietenholz, M; Szomoru, A; Bignall, H. E; Boven, P; Charlot, P; Dodson, R; Frey, S; Garrett, M. A; Imai, H; Lobanov, A; Reid, M. J; Ros, E; Van Langevelde, H. J; Zensus, A. J; Zheng, X W; Alberdi, A; Agudo, I; An, T; Argo, M; Beswick, R; Biggs, A; Brunthaler, A; Campbell, B; Cimo, G; Colomer, F; Corbel, S; Conway, J. E; Cseh, D; Deane, R; Falcke, H .D. E; Gawronski, M; Gaylard, M; Giovannini, G; Giroletti, M; Goddi, C; Goedhart, S; Gomez, J. L; Gunn, A; Kharb, P; Kloeckner, H. R; Koerding, E; Kovalev, Y; Kunert-Bajraszewska, M; Lindqvist, M; Lister, M; Mantovani, F; Marti-Vidal, I; Mezcua, M; McKean, J; Middelberg, E; Miller-Jones, J. C. A; Moldon, J; Muxlow, T; O'Brien, T; Perez-Torres, M; Pogrebenko, S. V; Quick, J; Rushton, A; Schilizzi, R; Smirnov, O; Sohn, B .W; Surcis, G; Taylor, G. B; Tingay, S; Tudose, V. M; van der Horst, A; van Leeuwen, J; Venturi, T; Vermeulen, R; Vlemmings, W. H. T; de Witt, A; Wucknitz, O; Yang, J; Gabanyi, K; Jung, T (International School for Advanced Studies (SISSA), 2015-04)
    Adding VLBI capability to the SKA arrays will greatly broaden the science of the SKA, and is feasible within the current specifications. SKA-VLBI can be initially implemented by providing phased-array outputs for SKA1-MID ...
  • From nearby low luminosity AGN to High Redshift Radio Galaxies: science interests with square kilometre array 
    Kharb, P; Lal, D. V; Singh, V; Bagchi, J; Ishwara-Chandra, C. H; Hota, A; Konar, C; Wadadekar, Yogesh; Shastri, P; Mousumi Das; Baliyan, K; Nath, B. B; M. Pandey-Pommier (Springer, 2016-12)
    We present detailed science cases that a large fraction of the Indian AGN community is interested in pursuing with the upcoming Square Kilometre Array (SKA). These interests range from understanding low luminosity active ...
  • Breaking the habit: the peculiar 2016 eruption of the unique recurrent nova M31N 2008-12a 
    Henze, M; Darnley, M. J; Williams, S. C; Kato, M M; Hachisu, I; Anupama, G. C; Arai, A; Boyd, D; Burke, D; Ciardullo, R; Chinetti, K; Cook, L. M; Cook, M. J; Erdman, P; Gao, X; Harris, B; Hartmann, D. H; Hornoch, K; Chuck Horst, J; Hounsel, R; Husar, D; Itagaki, K; Kabashima, F; Kafka, S; Kaur, A; Kiyota, S; Kojiguchi, N; Kucakova, H; Kuramoto, K; Maehara, H; Mantero, A; Masci, F. J; Matsumoto, K; Naito, H; Ness, J.-U; Nishiyama, K; Oksanen, A; Osborne, J. P; Page, K. L; Paunzen, E; Pavana, M; Pickard, R; Prieto-Arranz, J; Rodri­guez-Gil, P; Sala, G; Sano, Y; Shafter, A. W; Sugiura, Y; Tan, H; Tordai, T; Vrastil, J; 22 others (IOP Publishing, 2018-04-10)
    Since its discovery in 2008, the Andromeda galaxy nova M31N 2008-12a has been observed in eruption every single year. This unprecedented frequency indicates an extreme object, with a massive white dwarf and a high accretion ...
  • Broad-band polarimetric investigation of the Type II-plateau supernova 2013ej 
    Brajesh Kumar; Pandey, S. B; Eswaraiah, C; Kawabata, K. S (Oxford University Press on behalf of the Royal Astronomical Society, 2016-03)
    We present results based on follow-up observations of the Type II-plateau supernova (II-P SN) 2013ej at six epochs spanning a total duration of ∼ 37 d. The R C -band linear polarimetric observations were carried out ...
  • Estimation of asymmetries in point spread function for the echelle spectrograph operating at Vainu Bappu Telescope for high precision radial velocity studies 
    Sireesha, C; Banyal, R. K; Sriram, S (SPIE--The International Society for Optical Engineering, 2018-07)
    Precision in the Radial Velocity (RV) measurements depends upon the efficiency of the technique to remove instrumental artifacts from stellar measurements. Iodine absorption cell technique is being implemented for high ...
  • Irradiation effects in close binaries in an electron scattering medium 
    Varghese, B. A; Srinivasa Rao, M (Springer, 2016-03)
    In a close binary system, the effects of irradiation are studied from an extended surface of the secondary component on the atmosphere of the primary. Primary and the secondary components are assumed to have equal radii ...

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