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Browsing by Author "Sahu, D. K."

Browsing by Author "Sahu, D. K."

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  • Bridging between Type IIb and Ib Supernovae: SN IIb 2022crv with a Very Thin Hydrogen Envelope 
    Gangopadhyay, Anjasha; Maeda, Keiichi; Singh, Avinash; A. J, Nayana; Nakaoka, Tatsuya; Kawabata, Koji S; Taguchi, Kenta; Singh, Mridweeka; Chandra, Poonam; Ryder, Stuart D; Dastidar, Raya; Yamanaka, Masayuki; Kawabata, Miho; Alsaberi, Rami Z. E; Dukiya, Naveen; Singh Teja, Rishabh; Ailawadhi, Bhavya; Dutta, Anirban; Sahu, D. K.; Moriya, Takashi J; Misra, Kuntal; Tanaka, Masaomi; Chevalier, Roger; Tominaga, Nozomu; Uno, Kohki; Imazawa, Ryo; Hamada, Taisei; Hori, Tomoya; Isogai, Keisuke (The Astrophysical Journal, 2023-11)
    We present optical, near-infrared, and radio observations of supernova (SN) SN IIb 2022crv. We show that it retained a very thin H envelope and transitioned from an SN IIb to an SN Ib; prominent Hα seen in the pre-maximum ...
  • Early optical and millimeter observations of GRB 030226 afterglow 
    Pandey, S. B.; Sagar, R.; Anupama, G. C.; Bhattacharya, D.; Sahu, D. K.; Castro-Tirado, A. J.; Bremer, M. (2004)
    The CCD magnitudes in Johnson UBV and Cousins RI photometric passbands for the afterglow of the long duration GRB 030226 are presented. Upper limits of a few mJy to millimeter wave emission at the location of optical are ...
  • Far-ultraviolet to Near-infrared Observations of SN 2023ixf: A High-energy Explosion Engulfed in Complex Circumstellar Material 
    Teja, Rishabh Singh; Singh, Avinash; Basu, Judhajeet; Anupama, G. C.; Sahu, D. K.; Dutta, Anirban; Swain, Vishwajeet; Nakaoka, Tatsuya; Pathak, Utkarsh; Bhalerao, Varun; Barway, Sudhanshu; Kumar, Harsh; A. J, Nayana; Imazawa, Ryo; Kumar, Brajesh; Kawabata, Koji S. (Astrophysical Journal Letters, 2023-09)
    We present early-phase panchromatic photometric and spectroscopic coverage spanning the far-ultraviolet to near infrared regime of the nearest hydrogen-rich core-collapse supernova (SN) in the last 25 yr, SN 2023ixf. ...
  • A flattening in the optical light curve of SN 2002ap 
    Pandey, S. B.; Anupama, G. C.; Sagar, R.; Bhattacharya, D.; Sahu, D. K.; Pandey, J. C. (2003)
    We present the UBVRc I c broad-band optical photometry of the type Ic supernova SN 2002ap obtained during 2002 February 6–March 23 in the early decline phases and also later on 2002 August 15. Combining these data with the ...
  • Further evidence for intra-night optical variability of radio-quiet quasars 
    Goyal, A.; Krishna, G.; Sagar, R.; Anupama, G. C.; Sahu, D. K. (2007)
    Although well established for BL Lac objects and radio-loud quasars, the occurrence of intra-night optical variability (INOV) in radio-quiet quasars is still debated, primarily since only a handful of INOV events with ...
  • Intra-night optical variability of core dominated radio quasars: the role of optical polarization 
    Goyal, A.; Gopal-Krishna; Witta, P. J; Anupama, G. C.; Sahu, D. K.; Sagar, R.; Joshi, S. (2012)
    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 ...
  • A multiwavelength census of stellar contents in the young cluster NGC 1624 
    Jose, J.; Pandey, A. K.; Ogura, K.; Ojha, D. K.; Bhatt, B. C.; Samal, M. R.; Chauhan, N.; Sahu, D. K.; Rawat, P. S. (2011)
    We present a comprehensive multiwavelength analysis of the young cluster NGC 1624 associated with the HII region Sh2-212 using optical UBVRI photometry, optical spectroscopy and GMRT radio continuum mapping along with ...
  • NGC 146: A young open cluster with a Herbig Be star and intermediate mass pre-main sequence stars 
    Subramaniam, A.; Sahu, D. K.; Sagar, R.; Vijitha, P. (2005)
    We present UBV CCD photometry and low-resolution spectra of stars in the field of the young open cluster NGC 146.We estimated 10–16 Myr as the turn-off age for the upper main sequence of the cluster using isochrones and ...
  • The optical afterglow of the not so dark GRB 021211 
    Pandey, S. B.; Anupama, G. C.; Sagar, R.; Bhattacharya, D.; Castro-Tirado, A. J.; Sahu, D. K.; Parihar, P.; Prabhu, T. P. (2003)
    We determine Johnson B,V and Cousins R, I photometric CCD magnitudes for the afterglow of GRB 021211 during the first night after the GRB trigger. The afterglow was very faint and would have been probably missed if no ...
  • Optical observations of GRB 060124 afterglow: a case for an injection break 
    Misra, K.; Bhattacharya, D.; Sahu, D. K.; Sagar, R.; Anupama, G. C.; Castro-Tirado, A. J.; Guziy, S. S.; Bhatt, B. C. (2007)
    We present broad band optical afterglow observations of a long duration GRB 060124 using the 1.04-m Sampurnanand Telescope at ARIES, Nainital and the 2.01-m HCT at IAO, Hanle, including the earliest ground-based observations ...
  • Photometric and spectroscopic study of a highly reddened type Ia supernova SN 2003hx in NGC 2076 
    Misra, K.; Sahu, D. K.; Anupama, G. C.; Pandey, K. (2008)
    We present UBVRI CCD photometry and optical spectra of the type Ia supernova SN 2003hx which appeared in the galaxy NGC 2076, obtained till ∼ 146 d after the epoch of B-band maximum. The supernova reached at maximum ...
  • Post-outburst Evolution of Bona Fide FU Ori-type V2493 Cygnus: A Spectro photometric Monitoring 
    Ghosh, Arpan; Sharma, Saurabh; Ninan, Joe P.; Ojha, Devendra K.; Bhatt, Bhuwan C.; Sahu, D. K.; Baug, Tapas; Yadav, R. K.; Irawati, Puji; Gour, A. S.; Panwar, Neelam; Pandey, Rakesh; Sinha, Tirthendu (The Astrophysical Journal, 2023-09)
    We present here the results of 8 yr of our near-simultaneous optical–near-infrared spectro-photometric monitoring of the bona fide FU Ori (FUor)-type candidate V2493 Cygnus (V2493 Cyg) starting from 2013 September to ...
  • Prolonged intranight optical quiescence of the classical BL Lac object PKS 0735+178 
    Goyal, A.; Gopal-Krishna; Anupama, G. C.; Sahu, D. K.; Sagar, R.; Britzen, S.; Karazous, M.; Aller, M. F.; Aller, H. D. (2009)
    We report our extensive intranight optical monitoring of the well known low-energy peaked (LBL) BL Lac object PKS 0735+178. This long-term follow-up consists of R-band monitoring for a minimum duration of ∼ 4 hours, on 17 ...
  • Rapid optical variability of TeV blazars 
    Gopal-Krishna; Goyal, A.; Joshi, S.; Karthick, C.; Sagar, R.; Wiita, P. J.; Anupama, G. C.; Sahu, D. K. (2011)
    In this first systematic attempt to characterize the intranight optical variability (INOV) of TeVdetected blazars, we have monitored a well-defined set of nine TeV blazars on total 26 nights during 2004–10. In this R- or ...
  • SN 2002ap, the Hypernova of Class Ic 
    Pandey, S. B.; Sahu, D. K.; Anupama, G. C.; Bhattacharya, D.; Sagar, R. (2003)
    The supernova SN2002ap was discovered in the outer regions of the nearby spiral M74 on January 29.4 UT. Early photometric and spectroscopic observations indicate the supernova belongs to the class of Ic hypernovae SN 1997ef ...
  • SN 2018gj: A Short Plateau Type II Supernova with Persistent Blueshifted Ha Emission 
    Teja, Rishabh Singh; Singh, Avinash; Sahu, D. K.; Anupama, G. C.; Kumar, Brajesh; Nakaoka, Tatsuya; Kawabata, Koji S; Yamanaka, Masayuki; Takey, Ali; Kawabata, Miho (The Astrophysical Journal, 2023-09)
    We present an extensive, panchromatic photometric (UV, optical, and near-IR) and low-resolution optical spectroscopic coverage of a Type IIP supernova SN 2018gj that occurred on the outskirts of the host galaxy NGC 6217. ...
  • SN 2020ank: a bright and fast-evolving H-deficient superluminous supernova 
    Kumar, Amit; Kumar, Brajesh; Pandey, S. B.; Sahu, D. K.; Singh, Avinash; Anupama, G.C.; Aryan, Amar; Gupta, Rahul; Dutta, Anirban; Misra, Kuntal (Oup, 2021-09)
    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 ...
  • 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. (Monthly Notices of the 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 ...
  • Unusual optical quiescence of the classical BL Lac object PKS 0735+178 on intranight time-scale 
    Goyal, A.; Krishna-Gopal; Anupama, G. C.; Sahu, D. K.; Sagar, R.; Britzen, S.; Karouzos, M.; Aller, M. F.; Aller, H. D. (2009)
    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 ...

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