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Browsing by Author "Singh, A"

Browsing by Author "Singh, A"

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  • 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 ...
  • The fast, luminous ultraviolet transient AT2018cow: extreme supernova, or disruption of a star by an intermediate-mass black hole? 
    Perley, D. A; Mazzali, P. A; Yan, Lin|; Cenko, S. Bradley; Gezari, Suvi; Taggart, Kirsty; Blagorodnova, Nadia; Fremling, Christoffer; Mockler, Brenna; Singh, A; Tominaga, Nozomu; Tanaka, Masaomi; Watson, Alan M; Ahumada, Tomas; Anupama, G. C; Ashall, Chris; Becerra, Rosa L; Bersier, David; Bhalerao, Varun; Bloom, Joshua S; Butler, Nathaniel R; Copperwheat, Chris; Coughlin, Michael W; De, Kishalay; Drake, Andrew J; Duev, Dmitry A; Frederick, Sara; Gonzalez, J. J; Goobar, Ariel; Heida, Marianne; Ho, Anna Y. Q; Horst, John; Hung, Tiara; Itoh, Ryosuke; Jencson, Jacob E; Kasliwal, Mansi M; Kawai, Nobuyuki; Khanam, Tanazza; Kulkarni, Shrinivas R; Brajesh Kumar; Harsh Kumar; Kutyrev, Alexander S; Lee, William H; Maeda, Keiichi; Ashish Mahabal; Murata, Katsuhiro L; Neill, James D; Ngeow, Chow-Choong; Penprase, Bryan; Pian, Elena; Quimby, Robert; Ramirez-Ruiz, Enrico; Richer, Michael G; Roman-Zuniga, Carlos G; Sahu, D. K; Srivastav, S; 9 others (Oxford University Press on behalf of the Royal Astronomical Society, 2019-03)
    Wide-field optical surveys have begun to uncover large samples of fast (trise ≲ 5 d), luminous (Mpeak < −18), blue transients. While commonly attributed to the breakout of a supernova shock into a dense wind, the great ...
  • Flash Ionization Signatures in the Type Ibn Supernova SN 2019uo 
    Gangopadhyay, A; Misra, K; Hiramatsu, D; Wang, Shan-Qin; Hosseinzadeh, G; Wang, Xiaofeng; Valenti, Stefano; Zhang, Jujia; Howel, D. A; Arcavi, Iair; Anupama, G. C; Burke, Jamison; Dastidar, Raya; Koichi Itagaki, Koichi; Kumar, Brajesh; Kumar, B; Li, Long; McCully, Curtis; Mo, Jun; Pandey, S. B; Pellegrino, Craig; Sa, Hanna; Sahu, D. K; Pankaj Sanwal; Singh, A; Singh, M; Zhang, Jicheng; Zhang, Tianmeng; Zhang, Xinhan (IOP Publishing, 2020-02-01)
    We present photometric and spectroscopic observations of the type Ibn supernova (SN) 2019uo, the second ever SN Ibn with flash ionization (He ii, C iii, N iii) features in its early spectra. SN 2019uo displays a rapid ...
  • GROWTH on S190426c II: GROWTH-India Telescope search for an optical counterpart with a custom image reduction and candidate vetting pipeline 
    Kumar, Harsh; Bhalerao, Varun; Anupama, G. C; Barway, Sudhanshu; Coughlin, Michael W; De, Kishalay; Deshmukh, Kunal; Dutta, Anirban; Goldstein, Daniel A; Jassani, Adeem; Joharle, Simran; Karambelker, Viraj; Khandagale, Maitreya; Kumar, B; Saraogi, Divita; Sharma, Yashvi; Shenoy, Vedant; Singer, Leo; Singh, A; Waratkar, Gaurav (Oxford University Press on behalf of Royal Astronomical Society, 2022-11)
    S190426c/GW190426 152155 was the first probable neutron star–black hole merger candidate detected by the LIGO-Virgo Collaboration. We undertook a tiled search for optical counterparts of this event using the 0.7-m ...
  • Kilonova Luminosity Function Constraints Based on Zwicky Transient Facility Searches for 13 Neutron Star Merger Triggers during O3 
    Kasliwal, Mansi M; Anand, Shreya; Ahumada, Tomas; Stein, Robert; Carracedo, Ana Sagues; Andreoni, Igor; Coughlin, Michael W; Singer, Leo P; Kool, Erik C; Kishalay De; Harsh Kumar; Waratkar, Gaurav; Webb, Sara; Yu, Po-Chieh; Zhang, Bin-Bin; Zhou, Rongpu; Zolkower, Jeffry; AlMualla, Mouza; Yao, Yuhan; Bulla, Mattia; Dobie, Dougal; Reusch, Simeon; Perley, Daniel A; Cenko, S. Bradley; Bhalerao, Varun; Kaplan, David L; Sollerman, Jesper; Goobar, Ariel; Copperwheat, Christopher M; Bellm, Eric C; Anupama, G. C; Corsi, Alessandra; Nissanke, Samaya; Agudo, Ivan; Bagdasaryan, Ashot; Barway, Sudhanshu; Belicki, Justin; Bloom, Joshua S; Bolin, Bryce; Buckley, David A. H; Burdge, Kevin B; Burruss, Rick; Caballero-Garcia, Maria D; Cannella, Chris; Castro-Tirado, Alberto J; Cook, David O; Cooke, Jeff; Cunningham, Virginia; Dahiwale, Aishwarya; Deshmukh, Kunal; Dichiara, Simone; Duev, Dmitry A; Anirban Dutta; Feeney, Michael; Franckowiak, Anna; Frederick, Sara; Fremling, Christoffer; Gal-Yam, Avishay; Gatkine, Pradip; Ghosh, Shaon; Goldstein, Daniel A; Zach Golkhou, V; Graham, Matthew J; Graham, Melissa L; Hankins, Matthew J; Helou, George; Youdong Hu; Ip, Wing-Huen; Jaodand, Amruta; Karambelkar, Viraj; Kong, Albert K. H; Kowalski, Marek; Khandagale, Maitreya; Kulkarni, S. R; Brajesh Kumar; Laher, Russ R; Li, K. L; Mahaba, Ashish; Masci, Frank J; Miller, Adam A; Mogotsi, Moses; Mohite, Siddharth; Mooley, Kunal; Mroz, Przemek; Newman, Jeffrey A; Ngeow, Chow-Choong; Oates, Samantha R; Patil, Atharva Sunil; Pandey, S. B; Pavana, M; Pian, Elena; Riddle, Reed; Sanchez-Ramirez, Ruben; Sharma, Yashvi; Singh, A; Smith, Roger; Soumagnac, Maayane T; Taggart, Kirsty; Tan, Hanjie; Tzanidakis, Anastasios; Troja, Eleonora; Valeev, Azamat F; Walters, Richard (IOP Publishing, 2020-12-20)
    We present a systematic search for optical counterparts to 13 gravitational wave (GW) triggers involving at least one neutron star during LIGO/Virgo's third observing run (O3). We searched binary neutron star (BNS) and ...
  • Observational Signature of Circumstellar Interaction and 56Ni-mixing in the Type II Supernova 2016gfy 
    Singh, A; Brajesh Kumar; Moriya, Takashi J; Anupama, G. C; Sahu, D. K; Brown, Peter J; Andrews, Jennifer E; Smith, Nathan (IOP Publishing, 2019-09-01)
    The optical and ultraviolet broadband photometric and spectroscopic observations of the Type II supernova (SN) 2016gfy are presented. The V-band light curve (LC) shows a distinct plateau phase with a slope of s2 ∼ 0.12 mag ...
  • On the observational behaviour of the highly polarized Type IIn supernova SN 2017hcc 
    Brajesh Kumar; Eswaraiah, C; Singh, A; Sahu, D. K; Anupama, G. C; Kawabata, K. S; Yamanaka, Masayuki; Otsubo, Ikki; Pandey, S. B; Nakaoka, Tatsuya; Kawabata, Miho; Aryan, Amar; Akitaya, Hiroshi (Oxford University Press on behalf of the Royal Astronomical Society, 2019-09)
    We present the results based on photometric (Swift UVOT), broad-band polarimetric (V and Rbands) and optical spectroscopic observations of the Type IIn supernova (SN) 2017hcc. Our study is supplemented with spectropolarimetric ...
  • Optical studies of two stripped envelope supernovae − SN 2015ap (Type Ib) and SN 2016P (Type Ic) 
    Gangopadhyay, A; Misra, K; Sahu, D. K; Wang, Shan-Qin; Kumar, Brajesh; Li, Long; Anupama, G. C; Dastidar, R; Elias-Rosa, N; Kumar, Brijesh; Singh, Mridweeka; Pandey, S. B; Sanwal, Pankaj; Singh, A; Srivastav, S; Tartaglia, L; Tomasella, L (Oxford University Press on behalf of the Royal Astronomical Society, 2020-09)
    We present the photometric and spectroscopic studies of a Type Ib SN 2015ap and a Type Ic SN 2016P. SN 2015ap is one of the bright (MV = −18.04 mag) Type Ib while SN 2016P lies at an average value among the Type Ic SNe (MV ...
  • Photometric, polarimetric, and spectroscopic studies of the luminous, slow-decaying Type Ib SN 2012au 
    Pandey, S. B; Amit Kumar; Brajesh Kumar; Anupama, G. C; Srivastav, S; Sahu, D. K; Vinko, J; Aryan, A; Pastorello, A; Benetti, S; Tomasella, L; Singh, A; Moskvitin, A. S; Sokolov, V. V; Gupta, R; Misra, K; Ochner, P; Valenti, S (Oxford University Press on behalf of Royal Astronomical Society, 2021-10)
    Optical, near-infrared (NIR) photometric and spectroscopic studies, along with the optical imaging polarimetric results for SN 2012au, are presented in this article to constrain the nature of the progenitor and other ...
  • SN 2016B a.k.a. ASASSN-16ab: a transitional Type II supernova 
    Dastidar, R; Misra, K; Singh, M; Sahu, D. K; Pastorello, A; Gangopadhyay, A; Tomasella, L; Benetti, S; Terreran, G; Sanwal, Pankaj; Kumar, B; Singh, A; Brajesh Kumar; Anupama, G. C; Pandey, S. B (Oxford University Press on behalf of the Royal Astronomical Society, 2019-06)
    We present photometry, polarimetry, and spectroscopy of the Type II supernova ASASSN-16ab/SN 2016B in PGC 037392. The photometric and spectroscopic follow-up commenced about 2 weeks after shock breakout and continued until ...
  • SN 2017gmr: An Energetic Type II-P Supernova with Asymmetries 
    Andrews, Jennifer E.; Sand, D. J.; Valenti, S.; Smith, Nathan; Dastidar, Raya; Sahu, D. K.; Misra, Kuntal; Singh, A; Hiramatsu, D; Brown, P. J.; Hosseinzadeh, G.; Wyatt, S.; Vinko, J.; Anupama, G. C; & 62 Co-authors (IOP Publishing, 2019-12)
    We present high-cadence UV, optical, and near-infrared data on the luminous Type II-P supernova SN 2017gmr from hours after discovery through the fi rst 180 days. SN 2017gmr does not show signs of narrow, ...
  • SN 2017hpa: a carbon-rich Type Ia supernova 
    Anirban Dutta; Singh, A; Anupama, G. C; Sahu, D. K; Brajesh Kumar (Oxford University Press on behalf of the Royal Astronomical Society, 2021-05)
    We present the optical (UBVRI) and ultraviolet (Swift-Ultraviolet and Optical Telescope) photometry, and optical spectroscopy of Type Ia supernova SN 2017hpa. We study broad-band ultraviolet (UV)+optical light curves and ...
  • SN 2018hna: 1987A-like supernova with a signature of shock breakout 
    Singh, A; Sahu, D. K; Anupama, G. C; Brajesh Kumar; Harsh Kumar; Yamanaka, Masayuki; Baklanov, Petr V; Tominaga, Nozomu; Blinnikov, Sergei. I; Maeda, Keiichi; Anirban, D; Bhalerao, Varun; Ramya, M. Anche; Barway, Sudhanshu; Akitaya, Hiroshi; Nakaoka, Tatsuya; Kawabata, Miho; Kawabata, Koji. S; Sasada, Mahito; Takagi, Kengo; Maehara, Hiroyuki; Isogai, Keisuke; Kino, Masaru; Taguchi, Kenta; Nagao, Takashi (IOP Publishing, 2019-09-10)
    High-cadence ultraviolet, optical, and near-infrared photometric and low-resolution spectroscopic observations of the peculiar Type II supernova (SN) 2018hna are presented. The early-phase multiband light curves (LCs) ...
  • 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 ...

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