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Browsing by Author "Anupama, G. C"

Browsing by Author "Anupama, G. C"

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  • Big science in India 
    Anupama, G. C; Subhasis, Chattopadhyay; Deshpande, Shishir; Ghosh, Joydeep; Godbol, Rohini M; Indumathi, D; Souradeep, Tarun (Nature Publishing Group, 2021-11)
    Current and future big science projects in India are providing opportunities for young researchers and building technological capabilities, while contributing to new scientific discoveries. Seven scientists involved in ...
  • Black holes are in sight - Nobel in physics 2020 
    Anupama, G. C (Indian Physics Association, 2020-10)
    The Nobel Prize in Physics 2020 has been awarded to three scientists. One half of the prize was awarded to Roger Penrose and the other half was jointly awarded to Reinhard Genzel and Andrea Ghez. Penrose’s discovery of ...
  • 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; 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; Kučáková, 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; Rodríguez-Gil, P; Sala, G; Sano, Y; Shafter, A. W; Sugiura, Y; Tan, H; Tordai, T; Vraštil, J; Wagner, R. M; Watanabe, F; Williams, B. F; Bode, M. F; Bruno, A; Buchheim, B; Crawford, T; Goff, B; Hernanz, M; Igarashi, A. S; José, J; Motta, M; O’Brien, T. J; Oswalt, T; Poyner, G; Ribeiro, V. A. R. M; Sabo, R; Shara, M.M; Shears, J; Starkey, D; Starrfield, S; Woodward, C. E (IOP Publishing, 2018-04-10)
    which is the most promising candidate for the single-degenerate progenitor of a Type Ia supernova known to date. The previous three eruptions of M31N 2008-12a have displayed remarkably homogeneous multiwavelength properties: ...
  • 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 ...
  • The broad-line type ic supernova SN 2007ru: adding to the diversity of type ic supernovae 
    Sahu, D. K; Tanaka, M; Anupama, G. C; Gurugubelli, U. K; Nomoto, K (Institute of Physics, 2009-05)
    Photometric and spectral evolution of the Type Ic supernova SN 2007ru until around 210 days after maximum are presented. The spectra show broad spectral features due to very high expansion velocity, normally seen in ...
  • Broad-line Type Ic supernova SN 2014ad 
    Sahu, D. K; Anupama, G. C; Chakradhari, N. K; Srivastav, S; Tanaka, M; Maeda, K; Nomoto, K (Oxford University Press on behalf of the Royal Astronomical Society, 2018-04)
    We present optical and ultraviolet photometry and low-resolution optical spectroscopy of the broad-line Type Ic supernova SN 2014ad in the galaxy PGC 37625 (Mrk 1309), covering the evolution of the supernova during −5 to ...
  • BVRI photometry of the Dipper Asterism region in M 67 
    Anupama, G. C; Kembhavi, A. K; Prabhu, T. P; Singh, K. P; Bhat, P. N (European Southern Observatory, 1995-02)
    We present Cousins BVRI magnitudes for stars in the M 67 `dipper asterism' region, based on observations carried out at the prime focus of the 2.3 m Vainu Bappu Telescope of the Vainu Bappu Observatory, Kavalur. The ...
  • Can the Violent Merger of White Dwarfs Explain the Slowest Declining Type Ia Supernova SN 2011aa? 
    Dutta, Anirban; Anupama, G. C; Chakradhari, Nand Kumar; Sahu, D. K (American Astronomical Society, 2022-10-20)
    We present optical observations and Monte Carlo radiative transfer modeling of the Type Ia supernova (SN Ia) SN 2011aa. With a Δm15(B) of 0.59 ± 0.07 mag and a peak magnitude MB of −19.30 ± 0.27 mag, SN 2011aa has the ...
  • Cataclysmic variables: interclass connections 
    Anupama, G. C (Astronomical Society of India, 1996)
    The observational properties of the subclasses of the Cataclysmic Variables; classical and recurrent novae, dwarf novae, intermediate polars and the polars are described here. An interclass connection based on the properties ...
  • Characterization of sites for Indian large optical telescope project 
    Parihar, P. S; Sharma, T. K; Surendran, A; Kemkar, P. M. M; Dadul; Stanzin, U; Anupama, G. C (IOP Publishing, 2015-04)
    Growing Indian astronomical community require access to large observing facility preferably located within the country. Site surveys carried out in the post indicates that the best sites for optical-NIR astronomy can better ...
  • Characterizing the Ordinary Broad-line Type Ic SN 2023pel from the Energetic GRB 230812B 
    Srinivasaragavan, Gokul P; Swain, Vishwajeet; O’Connor, Brendan; Anand, Shreya; Ahumada, Tomás; Perley, Daniel; Stein, Robert; Sollerman, Jesper; Fremling, Christoffer; Cenko, S. Bradley; Antier, S; Guessoum, Nidhal; Hussenot-Desenonges, Thomas; Hello, Patrice; Lesage, Stephen; Hammerstein, Erica; Miller, M. Coleman; Andreoni, Igor; Bhalerao, Varun; Bloom, Joshua S; Dutta, Anirban; Gal-Yam, Avishay; Hinds, K-Ryan; Jaodand, Amruta; Kasliwal, Mansi; Kumar, Harsh; Kutyrev, Alexander S; Ragosta, Fabio; Ravi, Vikram; Sharma, Kritti; Teja, Rishabh Singh; Yang, Sheng; Anupama, G. C; Bellm, Eric C; Coughlin, Michael W; Mahabal, Ashish A; Masci, Frank J; Pathak, Utkarsh; Purdum, Josiah; Roberts, Oliver J; Smith, Roger; Wold, Avery (American Astronomical Society, 2024-01-10)
    We report observations of the optical counterpart of the long gamma-ray burst (GRB) GRB 230812B and its associated supernova (SN) SN 2023pel. The proximity (z = 0.36) and high energy (Eγ,iso ∼ 1053 erg) make it an important ...
  • Classification of Nova Spectra 
    Anupama, G. C (Astronomical Society of India, 2012)
    The evolution of the optical spectrum of a nova outburst is described. The classification schemes used to classify novae based on the outburst spectral features and their evolution are discussed.
  • 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 ...
  • Constraints on the evolution of the Triton atmosphere from occultations: 1989–2022 
    Sicardy, B; Tej, A; Gomes-Júnior, A. R; Romanov, F. D; Bertrand, T; Ashok, N. M; Lellouch, E; Morgado, B. E; Assafin, M; Desmars, J; Camargo, J. I. B; Kilic, Y; Ortiz, J. L; Vieira-Martins, R; Braga-Ribas, F; Ninan, J. P; Bhatt, B. C; Pramod Kumar, S; Swain, V; Sharma, S; Saha, A; Ojha, D. K; Pawar, G; Deshmukh, S; Deshpande, A; Ganesh, S; Jain, J. K; Mathew, S. K; Kumar, H; Bhalerao, V; Anupama, G. C; Barway, Sudhanshu; Brandeker, A; Floren, H. G; Olofsson, G; Bruno, G; Mao, Y. M; Ye, R. H; Zou, Q. Y; Sun, Y. K; Shen, Y. Y; Zhao, J. Y; Grishin, D. N; Romanova, L. V; Marchis, F; Fukui, K; Kukita, R; Benedetti-Rossi, G; Santos-Sanz, P; Dhyani, N; Gokhale, A; Kate, A (EDP Sciences, 2024-02)
    Context. In about 2000, the south pole of Triton experienced an extreme summer solstice that occurs every ∼650 years, when the subsolar latitude reached about 50°S. Bracketing this epoch, a few occultations probed the ...
  • Cosmic ray electron acceleration in the remnant of nova GK Persei? 
    Kantharia, N. G; Anupama, G. C; Subramanian, P (Tata Institute of Fundamental Research, 2005)
    Radio observations of the nova remnant of GK Per around 1985 (epoch 1) have shown it to have a spectral index of -0.4 (S propto nu^alpha) at frequencies <1.4 GHz and a spectral index of -0.7 at frequencies >1.4 GHz (Seaquist ...
  • The dark nature of GRB 051022 and its host galaxy 
    Castro-Tirado, A. J; Bremer, M; McBreen, S; Gorosabel, J; Guziy, S; Fakthullin, T. A; Sokolov, V. V; González Delgado, R. M; Bihain, G; Pandey, S. B; Jelínek, M; de Ugarte Postigo, A; Misra, K; Sagar, R; Bama, P; Kamble, A. P; Anupama, G. C; Licandro, J; Pérez-Ramírez, D; Bhattacharya, D; Aceituno, F. J; Neri, R (EDP Sciences, 2007-11)
    Aims.We present multiwavelength (X-ray/optical/near-infrared/millimetre) observations of GRB 051022 between 2.5 h and ~1.15 yr after the event. It is the most intense gamma-ray burst (~10-4 erg cm-2) detected by HETE-2, ...
  • Data analysis method for the search of point sources of gamma rays with the HAGAR telescope array 
    Britto, R. J; Acharya, B. S; Anupama, G. C; Bhattacharjee, P; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Mahesh, P. K; Manoharan, J; Nagesh, B. K; Parmar, N. K; Prabhu, T. P; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tsewang, D; Upadhya, S. S; Vishwanath, P. R (French Society of Astronomy and Astrophysics, 2011-12)
    The High Altitude GAmma-Ray (HAGAR) experiment is the highest altitude atmospheric Cherenkov sampling array, set up at 4300 m amsl in the Himalayas (Northern India). It constitutes 7 telescopes, each one with seven 90 ...
  • Dead or Alive? Long-term evolution of SN 2015bh (SNhunt275) 
    Elias-Rosa, N; Pastorello, A; Benetti, S; Cappellaro, E; Taubenberger, S; Terreran, G; Fraser, M; Brown, P. J; Tartaglia, L; Morales-Garoffolo, A; Harmanen, J; Richardson, N. D; Artigau, E; Tomasella, L; Margutti, R; Smartt, S. J; Dennefeld, M; Turatto, M; Anupama, G. C; Arbour, R; Berton, M; Bjorkman, K. S; Boles, T; Briganti, F; Chornock, R; Ciabattari, F; Cortini, G; Dimai, A; Gerhartz, C. J; Itagaki, K; Kotak, R; Mancini, R; Martinelli, F; Milisavljevic, D; Misra, K; Ochner, P; Patnaude, D; Polshaw, J; Sahu, D. K; Zaggia, S (Oxford University Press on behalf of the Royal Astronomical Society, 2016-12)
    Supernova (SN) 2015bh (or SNhunt275) was discovered in NGC 2770 on 2015 February with an absolute magnitude of Mr ∼ −13.4 mag, and was initially classified as an SN impostor. Here, we present the photometric and spectroscopic ...
  • delta Scuti stars in Praesepe. II. The STACC 1998 campaign - The spectroscopy 
    Dall, T. H; Frandsen, S; Lehmann, H; Anupama, G. C; Kambe, E; Handler, G; Kawanomoto, S; Watanabe, E; Fukata, M; Nagae, T; Horner, S (E D P Sciences, 2002-04)
    We present the results of a large international spectroscopic campaign on the delta Scuti star BN Cnc. Combining observations from five observatories taken over more than two weeks, we calculate line indices of the Hα line. ...
  • Discovery and rapid follow-up observations of the unusual type II SN 2018ivc in NGC 1068 
    Bostroem, K. A; Valenti, S; Sand, D. J; Andrews, J. E; Van Dyk, S. D; Galbany, L; Pooley, D; Amaro, R. C; Smith, N; Yang, S; Anupama, G. C; Arcavi, I; Baron, E; Brown, P. J; Burke, J; Cartier, R; Hiramatsu, D; Dastidar, R; DerKacy, J. M; Dong, Y; Egami, E; Ertel, S; Filippenko, A. V; Fox, O. D; Haislip, J; Hosseinzadeh, G; Howell, D. A; Gangopadhyay, A; Jha, S. W; Kouprianov, V; Kumar, B; Lundquist, M; Milisavljevic, D; McCully, C; Milne, P; Misra, K; Reichart, D. E; Sahu, D. K; Sai, H; Singh, A; Smith, P. S; Vinko, J; Wang, X; Wang, Y; Wheeler, J. C; Williams, G. G; Wyatt, S; Zhang, J; Zhang, X (IOP Publishing, 2020-05-20)
    We present the discovery and high-cadence follow-up observations of SN 2018ivc, an unusual SNe II that exploded in NGC 1068 (D = 10.1 Mpc). The light curve of SN 2018ivc declines piecewise-linearly, changing slope ...

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