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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Tachyons in Robertson-Walker cosmology 
    Tomaschitz, R (World Scientific, 1998-04)
    Superluminal signal transfer is studied in the context of a preferred cosmic frame of reference provided by the galactic background. The receding galaxies constitute a frame of absolute rest, in which the energy of tachyons ...
  • A tale of two GRB-SNe at a common redshift of z=0.54 
    Cano, Z; Bersier, D; Guidorzi, C; Margutti, R; Svensson, K. M; Kobayashi, S; Melandri, A; Wiersema, K; Pozanenko, A; van der Horst, A. J; Pooley, G. G; Fernandez-Soto, A; Castro-Tirado, A. J; de Ugarte Postigo, A; Im, M; Kamble, A. P; Sahu, D. K; Alonso-Lorite, J; Anupama, G. C; Bibby, J. L; Burgdorf, M. J; Clay, N; Curran, P. A; Fatkhullin, T. A; Fruchter, A. S; Garnavich, P; Gomboc, A; Gorosabel, J; Graham, J. F; Gurugubelli, U. K; Haislip, J; Huang, K; Huxor, A; Ibrahimov, M; Jeon, Y; Jeon, Y. B; Ivarsen, K; Kasen, D; Klunko, E; Kouveliotou, C; LaCluyze, A; Levan, A. J; Loznikov, V; Mazzali, P. A; Moskvitin, A. S; Mottram, C; Mundell, C. G; Nugent, P. E; Nysewander, M; O’Brien, P. T; Park, W. K; Peris, V; Pian, E; Reichart, D; Rhoads, J. E; Rol, E; Rumyantsev, V; Scowcroft, V; Shakhovskoy, D; Small, E; Smith, R. J; Sokolov, V. V; Starling, R. L. C; Steele, I; Strom, R. G; Tanvir, N. R; Tsapras, Y; Urata, Y; Vaduvescu, O; Volnova, A; Volvach, A; Wijers, R. A. M. J; Woosley, S. E; Young, D. R (Wiley-Blackwell, 2011-05)
    We present ground-based and Hubble Space Telescope optical observations of the optical transients (OTs) of long-duration Gamma Ray Bursts (GRBs) 060729 and 090618, both at a redshift of z= 0.54. For GRB 060729, bumps are ...
  • A tale of two nearby dwarf irregular galaxies WLM and IC 2574: As revealed by UVIT 
    Mondal, Chayan; Subramaniam, A; George, Koshy (Indian Academy of Sciences, 2021-10)
    We present an ultra-violet study of two nearby dwarf irregular galaxies WLM and IC 2574, using the Far-UV and Near-UV data from the Ultra-Violet Imaging Telescope (UVIT). We used the F148W band Far-UV images and identified ...
  • Tales from India. 1: Meteor showers in classical and colonial sources 
    Kapoor, R. C (University of Science and Technology of China, 2022-09)
    Meteor phenomena are always fascinating and capture popular attention. This paper reports results of a search for references to and records of meteor showers observed in the Indian region, until the close of the nineteenth ...
  • Tales from India: the great march comet of 1843 (C/1843 D1) 
    Kapoor, R. C (National Astronomical Research Institute of Thailand, 2021-11)
    This paper discusses the observations of the Great March Comet of 1843 made from India. The observers were at various locations and the newly formed observatories participated in the astronomical observations spread over ...
  • Taming the Electronic Structure of Diradicals through the Window of Computationally Cost Effective Multireference Perturbation Theory 
    Sinha Ray, Suvonil; Ghosh, A; Chattopadhyay, S; Chaudhuri, R. K (American Chemical Society, 2016-07-28)
    Recently a state-specific multireference perturbation theory (SSMRPT) with an improved virtual orbitals complete active space configuration interaction (IVO-CASCI) reference function has been proposed for treating electronic ...
  • Taming the Electronic Structure of Lead and Eka-lead (Flerovium) by the Relativistic Coupled Cluster Method 
    Chaudhuri, R. K; Chattopadhyay, S; Mahapatra, U. S (American Chemical Society, 2013-09-12)
    Theoretical investigations of the super-heavy elements (SHEs) are extremely challenging and are often the sole source of useful chemical information. Relativistic Fock-space multireference coupled cluster (RFS-MRCC) ...
  • Taming the excited states of butadiene, hexatriene, and octatetraene using state specific multireference perturbation theory with density functional theory orbitals 
    Manna, S; Chaudhuri, R. K; Chattopadhyay, S (American Institute of Physics, 2020-06-28)
    To compute the electronic excitation energies, a state-specific multireference Møller–Plesset perturbation theory (SSMRPT) with a complete active space configuration interaction reference function constructed using the ...
  • TANSPEC: TIFR-ARIES Near-infrared Spectrometer 
    Sharma, Saurabh; Ojha, Devendra. K; Ghosh, Arpan; Ninan, Joe. P; Ghosh, Supriyo; Ghosh, Swarna. K; Manoj, P; Naik, Milind. B; D'Costa, Savio, L. A; Reddy, B. Krishna; Nanjappa, Nandish; Pandey, Rakesh; Sinha, Tirthendu; Panwar, Neelam; Susmitha, A; Kaur, Harmeen; Sahu, Sanjit; Bangia, Tarun; Poojary, Satheesha S; Jadhav, Rajesh. B; Bhagat, Shailesh. B; Meshram, Ganesh. S; Shah, Harshit; Rayner, John. T; Toome, Douglas. W; Sandimani, Pradeep. R (IOP Publishing Ltd on behalf of the Astronomical Society of the Pacific, 2022-08)
    We present the design and performance of the TANSPEC, a medium-resolution 0.55–2.5 μm cryogenic spectrometer and imager, now in operation at the 3.6 m Devasthal Optical Telescope (DOT), Nainital, India. The TANSPEC provides ...
  • Target selection for the SDSS-III marvels survey 
    Paegert, M; Stassun, K. G; De Lee, N; Pepper, J; Fleming, S. W; Sivarani, T; Mahadevan, S; Mack, C. E; Dhital, S; Hebb, L; Ge, J (IOP Publishing, 2015-06)
    We present the target selection process for the Multi-object APO Radial Velocity Exoplanets Large-area Survey (MARVELS), which is part of the Sloan Digital Sky Survey (SDSS) III. MARVELS is a medium-resolution (R ∼ 11,000) ...
  • TAUVEX flight calibrations: Plans and challenges 
    Safonova, M; Shalima, P; Murthy, J (Astronomical Society of India, 2009-06)
    The operational tasks for the Performance Verification (PV) and calibration phase in the first year of TAUVEX operation are presented. The new challenges regarding the possible reduction in sensitivity are outlined and are ...
  • TAUVEX---UV observations from geosynchronous orbit 
    Murthy, J; Safonova, M; Mohan, Rekhesh; Gopakumar, P (Astronomical Society of India, 2007-06)
    The T Observatory consists of three identical co-aligned telescopes operating in several bands in the 1200-3500, rmAA bandpass from geostationary orbit. The major science objectives of T are (a) searches for QSOs and AGNs ...
  • TAUVEX: status in 2011 
    Brosch, N; Murthy, J (Springer, 2011-09)
    We present a short history of the TAUVEX instrument, conceived to provide multi-band wide-field imaging in the ultraviolet, emphasizing the lack of sufficient and aggressive support on the part of the different space ...
  • TCP J18224935-2408280: a symbiotic star identified during outburst 
    Sonith, L. S; Kamath, U. S (Oxford University Press on behalf of Royal Astronomical Society, 2023-12)
    TCP J18224935-2408280 was reported to be in outburst on 2021 May 19. Follow-up spectroscopic observations confirmed that the system was a symbiotic star. We present optical spectra obtained from the Himalayan Chandra ...
  • A technique for measurement of rotational frequency 
    Das, G. C (D. Reidel Publishing Co., 1979-12)
    On the basis of Chandrasekhar's proposition that the Coriolis force has an influence on the magnetohydrodynamic waves excited in cosmic phenomena, a simple approximate formula determining the rotational frequency from the ...
  • Telescope drive requirements and design of a Microcontroller based drive and display system 
    Chinnappan, V (Indian Institute of Astrophysics, Bangalore, 1993)
    Optical telescope is a precision instrument which gives images of stars and galaxies when the telescope is pointed towards them. To design a good telescope drive, the requirements of a good telescope is to be well defined. ...
  • 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 ...
  • Temperature and emission-line structure at the edges of H II regions 
    Mallik, D. C. V (American Astronomical Society, 1975-04)
    Models of ionization fronts located at the edges of expanding H II regions are presented. These fronts are of the weak D-type and are preceded by shocks in the H I clouds. Since the energy input time is smaller than the ...
  • Temperature at the poles and at the equator of the sun 
    Das, A. K; Abhyankar, K. D (Elsevier, 1955)
    The equivalent widths of the g and K lines are measured at the pole and at the equator of the Sun during a period of minimum solar activity. The difference of temperature between pole and equator is evaluated by Woolley's ...
  • Temperature of the F region of the ionosphere over Kodaikanal 
    Venugopal, V. R (Manager of Publications Civil Lines Delhi, 1960-04)
    Night temperature of the F region of the ionosphere over Kodaikanal has been computed by the scale height method for the months of June and December. The temperature at a height of 300km is found to be round about 1200°K. ...

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