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Browsing by Author "Sahu, D. K"

Browsing by Author "Sahu, D. K"

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  • SN 2020ank: a bright and fast-evolving H-deficient superluminous supernova 
    Amit Kumar; Brajesh Kumar; Pandey, S. B; Sahu, D. K; Singh, A; Anupama, G. C; Aryan, Amar; Gupta, Rahul; Anirban Dutta; Misra, K (Oxford University Press on behalf of the Royal Astronomical Society, 2021-04)
    We investigate the observational properties of a hydrogen-deficient superluminous supernova (SLSN) SN 2020ank (at z = 0.2485), with the help of early phase observations carried out between –21 and +52 d since g-band maximum. ...
  • SN 2020jfo: A Short-plateau Type II Supernova from a Low-mass Progenitor 
    Teja, Rishabh Singh; Singh, A; Sahu, D. K; Anupama, G. C; Kumar, Brajesh; Nayana, A. J (American Astronomical Society, 2022-05-01)
    We present spectroscopic and photometric observations of the Type IIP supernova, SN 2020jfo, in ultraviolet and optical wavelengths. SN 2020jfo occurred in the spiral galaxy M61 (NGC 4303), with eight observed supernovae ...
  • SN 2020sck: Deflagration in a Carbon-Oxygen White Dwarf 
    Dutta, Anirban; Sahu, D. K; Anupama, G. C; Joharle, Simran; Kumar, Brajesh; Nayana, A. J; Singh, Avinash; Kumar, Harsh; Bhalerao, Varun; Barway, Sudhanshu (American Astronomical Society, 2022-02-01)
    We present optical UBVRI photometry and low-to-medium resolution spectroscopic observations of type Iax supernova SN 2020sck spanning −5.5 days to +67 days from maximum light in the B-band. From the photometric analysis ...
  • SN2007rw- A Type IIL Supernova 
    Arora, S; Sahu, D. K; Anupama, G. C (Astronomical Society of the Pacific, 2011-12)
    We present BVRI photometry and medium resolution spectroscopy of the supernova SN2007rw during ˜ 1 week to ˜ 7 months after discovery. This supernova was classified as a type IIb event, however, based on our analysis we ...
  • Star formation in blue compact dwarf Galaxies 
    Ramya, S; Prabhu, T. P; Sahu, D. K (Astronomical Society of India, 2012)
    Blue compact dwarf galaxies (BCDGs) are dwarfs undergoing current burst of star formation (SF). In our work, we determine the ages of the underlying old stellar population to be ∼4 Gyr that is dominating the mass of the ...
  • Star formation in blue compact dwarf galaxies: Mkn 104 and I Zw 97 
    Ramya, S; Sahu, D. K; Prabhu, T. P (Blackwell Publishing, 2009-06)
    Two blue compact dwarf galaxies, Mkn 104 and I Zw 97, are studied photometrically and spectroscopically. Mkn 104 is found to contain three distinct bright star-forming regions, whereas I Zw 97 is found to contain three ...
  • Stardust-NExT, Deep Impact, and the accelerating spin of 9P/Tempel 1 
    Belton, M. J. S; Meech, K. J; Chesley, S; PittichovĆ, J; Carcich, B; Drahus, M; Harris, A; Gillam, S; Veverka, J; Mastrodemos, N; Owen, W; A’Hearn, M. F; Bagnulo, S; Bai, J; Barrera, L; Bastien, F; Bauer, J. M; Bedient, J; Bhatt, B. C; Boehnhardt, H; Brosch, N; Buie, M; Candia, P; Chen, W; Chiang, P; Choi, Y; Cochran, A; Crockett, C. J; Duddy, S; Farnham, T; Fernández, Y. R; Gutiérrez, P; Hainaut, O. R; Hampton, D; Herrmann, K. A; Hsieh, H; Kadooka, M. A; Kaluna, H; Keane, J; Kim, M; Klaasen, K; Kleyna, J; Krisciunas, K; Lara, L. M; Lauer, T. R; Li, J; Licandro, J; Lisse, C. M; Lowry, S. C; McFadden, L; Moskovitz, N; Mueller, B; Polishook, D; Raja, N. S; Riesen, T; Sahu, D. K; Samarasinha, N; Sarid, G; Sekiguchi, T; Sonnett, S; Suntzeff, N. B; Taylor, B. W; Thomas, P; Tozzi, G. P; Vasundhara, R; Vincent, J; Wasserman, L. H; Webster-Schultz, B; Yang, B; Zenn, T; Zhao, H (Elsevier B.V., 2011-05)
    The evolution of the spin rate of Comet 9P/Tempel 1 through two perihelion passages (in 2000 and 2005) is determined from 1922 Earth-based observations taken over a period of 13 year as part of a World-Wide observing ...
  • Study of dust and ionized gas in early-type galaxies 
    Kulkarni, S; Sahu, D. K; Chaware, L; Chakradhari, N. K; Pandey, S. K (Elsevier B.V, 2014-07)
    We present results of optical broad-band and narrow-band Hα observations of a sample of forty nearby early-type galaxies. The majority of sample galaxies are known to have dust in various forms viz. dust lanes, nuclear ...
  • Study of star formation in NGC 1084 
    Ramya, S; Sahu, D. K; Prabhu, T. P (Blackwell Publishing, 2007-10)
    We present UBVRI broad-band, Hα narrow-band photometry of the star-forming complexes in the infrared bright galaxy NGC 1084. Results of medium-resolution spectroscopy of some of the brighter complexes are also discussed. ...
  • Supernova SN 2012dn: a spectroscopic clone of SN 2006gz 
    Chakradhari, N. K; Sahu, D. K; Srivastav, S; Anupama, G. C (Oxford University Press on behalf of the Royal Astronomical Society, 2014-09-11)
    We present optical and UV analysis of the luminous Type Ia supernova SN 2012dn covering the period from ∼−11 to +109 d with respect to the B-band maximum, which occurred on JD 245 6132.89 ± 0.19, with an apparent magnitude ...
  • 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 ...
  • TNO or Comet? The Search for Activity and Characterization of Distant Object 418993 (2009 MS9) 
    Bufanda, Erica; Meech, Karen J; Kleyna, Jan T; Hainaut, Olivier R; Bauer, James M; Stephens, Haynes; Veres, Peter; Micheli, Marco; Keane, Jacqueline V; Weryk, Robert; Wainscoat, Richard; Sahu, D. K; Bhatt, B. C (American Astronomical Society, 2023-01)
    The perihelion of the trans-Neptunian object (TNO) 2009 MS9 brings it close to the distance where some longperiod comets are seen to become active. Knowing this, and the fact that this object appears to brighten in excess ...
  • The Transit Timing and Atmosphere of Hot Jupiter HAT-P-37b 
    A-thano, Napaporn; Jiang, Ing-Guey; Awiphan, Supachai; Rattanamala, Ronnakrit; Su, Li-Hsin; Hengpiya, Torik; Sariya, Devesh P.; Yeh, Li-Chin; Shlyapnikov, A. A.; Gorbachev, Mark A.; Rublevski, Alexey N.; Mannaday, Vineet Kumar; Thakur, Parijat; Sahu, D. K; Mkrtichian, David; Griv, Evgeny (American Astronomical Society, 2022-02-01)
    We perform transit timing variation (TTV) and transmission spectroscopy analyses of the planet HAT-P-37b, which is a hot Jupiter orbiting a G-type star. Nine new transit light curves are obtained and analyzed together with ...
  • Type Ia supernova SN 2003du: Optical observations 
    Anupama, G. C; Sahu, D. K; Jose, J (EDP Sciences, 2005-01)
    UBVRI photometry and optical spectra of type Ia supernova SN 2003du obtained at the Indian Astronomical Observatory for nearly a year since discovery are presented. The apparent magnitude at maximum was $B=13.53\pm ...
  • Type Ia supernovae SN 2013bz, PSN J0910 + 5003, and ASASSN-16ex: similar to 09dc-like? 
    Tiwari, S; Chakradhari, N. K; Sahu, D. K; Anupama, G. C; Kumar, B; Sahu, K. R (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    We present optical photometric and spectroscopic studies of three supernovae (SNe): SN 2013bz, PSN J0910 + 5003, and ASASSN-16ex (SN 2016ccj). UV–optical photometric data of ASASSN-16ex obtained with the Swift ...
  • Type Ia Supernovae: Progenitors and Peculiarity 
    Nomoto, K; Tanaka, M; Kawabata, K. S; Sahu, D. K; Anupama, G. C (American Institute of Physics, 2007-08)
    Among the controversial issues on Type Ia supernovae (SNe Ia), we discuss (1) the evolutionary paths of the progenitor systems to SNe Ia, especially, the thermal stability of hydrogen shell burning in accreting white dwarfs, ...
  • Type Ib supernova 2008d associated with the luminous x-ray transient 080109: an energetic explosion of a massive helium star 
    Tanaka, M; Tominaga, N; Nomoto, K; Valenti, S; Sahu, D. K; Minezaki, T; Yoshii, Y; Yoshida, M; Anupama, G. C; Benetti, S; Chincarini, G; Valle, M. D; Mazzali, P. A; Pian, E (The American Astronomical Society, 2009-02)
    We present a theoretical model for supernova SN 2008D associated with the luminous X-ray transient 080109. The bolometric light curve and optical spectra of the SN are modeled based on the progenitor models and the explosion ...
  • The Unique Type Ib Supernova 2005bf: A WN Star Explosion Model for Peculiar Light Curves and Spectra 
    Tominaga, N; Tanaka, M; Nomoto, K; Mazzali, P. A; Deng, J; Maeda, K; Umeda, H; Modjaz, M; Hicken, M; Challis, P; Kirshner, R. P; Wood-Vasey, W. M; Blake, C. H; Bloom, J. S; Skrutskie, M. F; Szentgyorgyi, A; Falco, E. E; Inada, N; Minezaki, T; Yoshii, Y; Kawabata, K; Iye, M; Anupama, G. C; Sahu, D. K; Prabhu, T. P (The American Astronomical Society, 2005-11-10)
    Observations and modeling for the light curve (LC) and spectra of supernova (SN) 2005bf are reported. This SN showed unique features: the LC had two maxima, and declined rapidly after the second maximum, while the spectra ...
  • Unravelling optical and X-ray properties of the disc-dominated intermediate polar IGR J15094-6649 
    Joshi, Arti; Rawat, Nikita; Schwope, Axel; Pandey, J. C; Scaringi, Simone; Sahu, D. K; Rao, Srinivas M; Singh, Mridweeka (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    We present analyses of an Intermediate Polar, IGR J15094-6649, based on the archival optical data obtained from the Transiting Exoplanet Survey Satellite (TESS) and X-ray data obtained from the Suzaku, NuSTAR, and Neil ...
  • Unusual optical quiescence of the classical BL Lac object PKS 0735+178 on intranight time scale 
    Goyal, A; Gopal-Krishna; Anupama, G. C; Sahu, D. K; Sagar, R; Britzen, S; Karouzos, M; Aller, M. F; Aller, H. D (Wiley Blackwell, 2009-07)
    We present the result of our extensive intranight optical monitoring of the well known low-energy peaked BL Lac (LBL) object PKS 0735+178. This long-term follow-up consists of $R$-band monitoring for a minimum duration of ...

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