Research Publications Based on data from Indian Astronomical Observatory: Recent submissions

  • Properties of Newly Formed Dust Grains in the Luminous Type IIn Supernova 2010jl 
    Maeda, K; Nozawa, T; Sahu, D. K; Minowa, Y; Motohara, K; Ueno, I; Folatelli, G; Pyo, T. S; Kitagawa, Y; Kawabata, K. S; Anupama, G. C; Kozasa, T; Moriya, T. J; Yamanaka, M; Nomoto, K; Bersten, M; Quimby, R; Iye, M (IOP Publishing, 2013-10-10)
    Supernovae (SNe) have been proposed to be the main production sites of dust grains in the universe. However, our knowledge of their importance to dust production is limited by observationally poor constraints on the nature ...
  • One year of monitoring of the Type IIb supernova SN 2011dh 
    Sahu, D. K; Anupama, G. C; Chakradhari, N. K (Oxford University Press on behalf of the Royal Astronomical Society, 2013-07-21)
    Optical UBVRI photometry and low-resolution spectroscopy of the Type IIb supernova SN 2011dh in M51 are presented, covering the first year after the explosion. The light curve and spectral evolution are discussed. The early ...
  • Habitable Planets Eclipsing Brown Dwarfs: Strategies for Detection and Characterization 
    Belu, A. R; Selsis, F; Raymond, S. N; Palle, E; Street, R; Sahu, D. K; Braun, K. V; Bolmont, E; Figueira, P; Anupama, G. C; Ribas, Ignasi (IOP Publishing, 2013-05-10)
    Given the very close proximity of their habitable zones, brown dwarfs (BDs) represent high-value targets in the search for nearby transiting habitable planets that may be suitable for follow-up occultation spectroscopy. ...
  • Photometric and spectroscopic evolution of supernova SN 2009an: another case of a transitional Type Ia event 
    Sahu, D. K; Anupama, G. C; Anto, P (Oxford University Press on behalf of the Royal Astronomical Society, 2013-04-01)
    We present optical UBVRI photometry and medium-resolution spectroscopy of a transitional Type Ia supernova, SN 2009an, over the period −6 to +150 d from the B maximum. With a Δm15(B) = 1.514 ± 0.132, SN 2009an declines ...
  • Light curve and spectral evolution of the Type IIb supernova 2011fu 
    Kumar, Brajesh; Pandey, S. B; Sahu, D. K; Vinko, J; Moskvitin, A. S; Anupama, G. C; Bhatt, V. K; Ordasi, A; Nagy, A; Sokolov, V. V; Sokolova, T. N; Komarova, V. N; Kumar, Brijesh; Bose, S; Roy, R; Sagar, R (Oxford University Press on behalf of the Royal Astronomical Society, 2013-05-01)
    We present the low-resolution spectroscopic and UBVRI broad-band photometric investigations of the Type IIb supernova (SN) 2011fu, discovered in UGC 01626. The photometric follow-up of this event was initiated a few days ...
  • Multiwavelength Study of the NGC 281 Region 
    Sharma, S; Pandey, A. K; Pandey, J. C; Chauhan, N; Ogura, K; Ojha, D. K; Borrissova, J; Mito, H; Verdugo, T; Bhatt, B. C (Astronomical Society of Japan, 2012-10)
    We present a multiwavelength study of the NGC 281 complex which contains the young cluster IC 1590 at the center, using deep wide-field optical UBV Ic photometry, slitless spectroscopy along with archival data sets in ...
  • Comprehensive multiwavelength modelling of the afterglow of GRB 050525A 
    Resmi, L; Misra, K; Johannesson, G; Castro-Tirado, A. J; Gorosabel, J; Jelınek, M; Bhattacharya, D; Kubanek, P; Anupama, G. C; Sota, A; Sahu, D. K; de Ugarte Postigo, A; Pandey, S. B; Sanchez-Ramırez, R; Bremer, M; Sagar, R (Wiley-Blackwell, 2012-11)
    The Swift era has posed a challenge to the standard blast-wave model of gamma-ray burst (GRB) afterglows. The key observational features expected within the model are rarely observed, such as the achromatic steepening ...
  • Star Formation Activity in the Galactic H II Region Sh2-297 
    Mallick, K. K; Ojha, D. K; Samal, M. R; Pandey, A. K; Bhatt, B. C; Ghosh, S. K; Dewangan, L. K; Tamura, M (IOP Publishing, 2012-11-01)
    We present a multiwavelength study of the Galactic H II region Sh2-297, located in the Canis Major OB1 complex. Optical spectroscopic observations are used to constrain the spectral type of ionizing star HD 53623 as B0V. ...
  • An unusual very low-mass high-amplitude pre-main sequence periodic variable 
    Rodríguez-Ledesma, M. V; Mundt, R; Ibrahimov, M; Messina, S; Parihar, P. S; Hessman, F. V; Alves de Oliveira, C; Herbst, W (EDP Sciences, 2012-08)
    Aims. We have investigated the nature of the variability of CHS 7797, an unusual periodic variable in the Orion Nebula Cluster. Methods. An extensive I-band photometric data set of CHS 7797 was compiled between 2004−2010 ...
  • NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field 
    Wade, G. A; Maiz, J. A; Martins, F; Petit, V; Grunhut, J; Walborn, N. R; Barba, R. H; Gagne, M; Garcia-Melendo, E; Jose, J; Moffat, A. F. J; Naze, Y; Neiner, C; Pellerin, A; Penades, O. M; Shultz, M; Simon-Diaz, S; Sota, A (Wiley-Blackwell, 2012-09)
    This paper presents a first observational investigation of the faint Of?p star NGC 1624-2, yielding important new constraints on its spectral and physical characteristics, rotation, magnetic field strength, X-ray emission ...
  • Intra-night optical variability of core dominated radio quasars: the role of optical polarization 
    Goyal, A; Gopal-Krishna; Wiita, P. J; Anupama, G. C; Sahu, D. K; Sagar, R; Joshi, S (EDP Sciences, 2012-08)
    Context. Rapid variations in optical flux are seen in many quasars and all blazars. The amount of variability in different classes of active galactic nuclei has been studied extensively but many questions remain unanswered. ...
  • A Study of the Role of Lyβ Fluorescence on O I Line Strengths in Be Stars 
    Blesson, M; Banerjee, D. P. K; Subramaniam, A; Ashok, N. M (IOP Publishing, 2012-07-01)
    The possibility of the Lyβ fluorescence mechanism being operational in classical Be (CBe) stars and thereby contributing to the strength of the O I λ8446 line has been recognized for long. However, this supposition needs ...
  • Star formation in bulgeless late-type galaxies: clues to their evolution 
    Mousumi Das; Sengupta, C; Ramya, S; Misra, K (Wiley-Blackwell, 2012-07)
    We present Giant Meterwave Radio Telescope 1280-MHz radio continuum observations and follow-up optical studies of the disc and nuclear star formation in a sample of low-luminosity bulgeless galaxies. The main aim is to ...
  • Panchromatic observations of the textbook grb 110205a: constraining physical mechanisms of prompt emission and afterglow 
    Zheng, W; Shen, R. F; Sakamoto, T; Beardmore, A. P; De Pasquale, M; Wu, X. F; Gorosabel, J; Urata, Y; Sugita, S; Zhang, B; Pozanenko, A; Nissinen, M; Sahu, D. K; Im, M; Ukwatta, T. N; Andreev, M; Klunko, E; Volnova, A; Akerlof, C. W; Anto, P; Barthelmy, S. D; Breeveld, A; Carsenty, U; Castillo-Carrion, S; Castro-Tirado, A. J; Chester, M. M; Chuang, C. J; Cunniffe, R; De Ugarte Postigo, A; Duffard, R; Flewelling, H; Gehrels, N; Guver, T; Guziy, S; Hentunen, V. P; Huang, K. Y; Jelinek, M; Koch, T. S; Kubanek, P; Kuin, P; McKay, T. A; Mottola, S; Oates, S. R; O'Brien, P; Ohno, M; Page, M. J; Pandey, S. B; Perez del Pulgar, C; Rujopakarn, W; Rykoff, E; Salmi, T; Sanchez-Ramirez, R; Schaefer, B. E; Sergeev, A; Sonbas, E; Sota, A; Tello, J. C; Yamaoka, K; Yost, S. A; Yuan, F (IOP Publishing, 2012-06-01)
    We present a comprehensive analysis of a bright, long-duration (T /sub90/ ~ 257 s) GRB 110205A at redshift z = 2.22. The optical prompt emission was detected by Swift/UVOT, ROTSE-IIIb, and BOOTES telescopes when the gamma-ray ...
  • FR Cnc revisited: photometry, polarimetry and spectroscopy 
    Golovin, A; Galvez-Ortiz, M. C; Hernan-Obispo, M; Andreev, M; Barnes, J. R; Montes, D; Pavlenko, E; Pandey, J. C; Martinez-Arnaiz, R; Medhi, B. J; Parihar, P. S; Henden, A; Sergeev, A; Zaitsev, S. V; Karpov, N (Wiley-Blackwell, 2012-03)
    This paper is part of a multiwavelength study aimed at using complementary photometric, polarimetric and spectroscopic data to achieve an understanding of the activity process in late-type stars. Here, we present the ...
  • Discovery of Main-belt Comet P/2006 VW139 by Pan-STARRS1 
    Hsieh, H. H; Yang, Bin; Haghighipour, N; Kaluna, H. M; Fitzsimmons, A; Denneau, L; Novakovic, B; Jedicke, R; Wainscoat, R. J; Armstrong, J. D; Duddy, S. R; Lowry, S. C; Trujillo, C. A; Micheli, M; Keane, J. V; Urban, L; Riesen, T; Meech, K. J; Abe, S; Cheng, Yu-Chi; Chen, Wen-Ping; Granvik, M; Grav, T; Ip, Wing-Huen; Kinoshita, D; Kleyna, J; Lacerda, P; Lister, T; Milani, A; Tholen, D. J; Vereš, P; Lisse, C. M; Kelley, M. S; Fernández, Y. R; Bhatt, B. C; Sahu, D. K; Kaiser, N; Chambers, K. C; Hodapp, K. W; Magnier, E. A; Price, P. A; Tonry, J. L (IOP Publishing, 2012-03-20)
    The main-belt asteroid (300163) 2006 VW139 (later designated P/2006 VW139) was discovered to exhibit comet-like activity by the Pan-STARRS1 (PS1) survey telescope using automated point-spread-function analyses performed ...
  • Studies of a possible new Herbig Ae/Be star in the open cluster NGC 7380 
    Mathew, B; Banerjee, D. P. K; Ashok, N. M; Subramaniam, A; Bhavya, B; Joshi, V (Chinese Academy of Sciences, 2012-02)
    We present a study of the star 2MASS J22472238+5801214 with the aim of identifying its true nature which has hitherto been uncertain. This object, which is a member of the young cluster NGC 7380, has been variously proposed ...
  • Optical spectroscopy of classical Be stars in open clusters 
    Mathew, B; Subramaniam, A (Astronomical Society of India, 2011-12)
    We present a spectroscopic study of 150 Classical Be stars in 39 open clusters using medium resolution spectra in the wavelength range 3800 – 9000 A° . Onethird of the sample (48 stars in 18 clusters) has been studied ...
  • The unusually large population of Blazhko variables in the globular cluster NGC 5024 (M53) 
    Arellano Ferro, A; Bramich, D. M; Figuera Jaimes, R; Giridhar, S; Kuppuswamy, K (Wiley-Blackwell, 2012-02)
    We report the discovery of amplitude and phase modulations typical of the Blazhko effect in 22 RRc and nine RRab type RR Lyrae stars in NGC 5024 (M53). This brings the confirmed Blazhko variables in this cluster to 23 RRc ...
  • Active galactic nucleus activity and black hole masses in low surface brightness galaxies 
    Ramya, S; Prabhu, T. P; Mousumi Das (Wiley-Blackwell, 2011-12)
    We present medium resolution optical spectroscopy of a sample of nine low surface brightness (LSB) galaxies. For those that show clear signatures of active galactic nucleus (AGN) emission, we have disentangled the AGN ...

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