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Browsing IIAP Publications by Subject "Techniques: photometric"

Browsing IIAP Publications by Subject "Techniques: photometric"

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  • Optical studies of a bright Type Iax supernova SN 2020rea 
    Singh, Mridweeka; Misra, Kuntal; Sahu, D. K; Ailawadhi, Bhavya; Dutta, Anirban; Howell, D. Andrew; Anupama, G. C; Bostroem, K. Azalee; Burke, Jamison; Dastidar, Raya; Gangopadhyay, Anjasha; Hiramatsu, Daichi; Im, Hyobin; McCully, Curtis; Pellegrino, Craig; Srivastav, Shubham; Teja, Rishabh Singh (Oxford University Press on behalf of Royal Astronomical Society, 2022-12)
    We present optical photometric and spectroscopic analysis of a Type Iax supernova (SN) 2020rea situated at the brighter luminosity end of Type Iax supernovae (SNe). The light curve decline rate of SN 2020rea is m15(g) = ...
  • Optical variability of narrow-line and broad-line Seyfert 1 galaxies 
    Rakshit, S; Stalin, C. S (IOP Publishing, 2017-05)
    We studied the optical variability ( OV ) of a large sample of narrow-line Seyfert 1 ( NLSy1 ) and broad-line Seyfert 1 ( BLSy1 ) galaxies with z  <  0.8 to investigate any differences in their OV ...
  • Orbital solutions derived from radial velocities and time delays for four Kepler systems with A/F-type (candidate) hybrid pulsators⋆ 
    Lampens, P; Vermeylen, L; Fremat, Y; Sodor, A; Skarka, M; Samadi-Ghadim, A; Bognar, Zs; Lehmann, H; De Cat, P; Goswami, A; Dumortier, L (EDP Sciences, 2021-03)
    Context. The presence of A/F-type Kepler hybrid stars extending across the entirety of the δ Scuti – γ Doradus instability strips and beyond remains largely unexplained. In order to better understand these particular stars, ...
  • The PHEMU15 catalogue and astrometric results of the Jupiter's Galilean satellite mutual occultation and eclipse observations made in 2014-2015 
    Saquet, E; Emelyanov, N; Robert, V; Arlot, J. -E; Anbazhagan, P; Baillie, K; Bardecker, J; Berezhnoy, A. A; Bretton, M; Campos, F; Capannoli, L; Pomazan, A; Popescu, M; Pratt, A; Raskhozhev, V. N; Resch, J.-M; Robilliard, D; Roschina, E; Rothenberg, E; Rottenborn, M; Rusov, S. A; Talbot, J; Saby, F; Saya, L. F; Selvakumar, G; Signoret, F; Slesarenko, V. Y; Sokov, E. N; Soldateschi, J; Sonka, A; Soulie, G; Tejfel, V. G; Thuillot, W; Timerson, B; Toma, R; Torsellini, S; Trabuco, L. L; Traverse, P; Tsamis, V; Unwin, M; Carry, B; Van Den Abbeel, F; Vandenbruaene, H; Vasundhara, R; Velikodsky, Y. I; Vienne, A; Vilar, J; Vugnon, J. -M; Wuensche, N; Zeleny, P; Castet, M; Charbonnier, Y; Chernikov, M. M; Christou, A; Colas, F; Coliac, J. -F; Dangl, G; Dechambre, O; Delcroix, M; Dias-Oliveira, A; Drillaud, C; Duchemin, Y; Dunford, R; Ellington, C; Fabre, P; Filippov, V. A; Finnegan, J; Foglia, S; Font, D; Gaillard, B; Galli, G; Garlitz, J; Gasmi, A; Gaspar, H. S; Gault, D; Gazeas, K; George, T; Gorda, S. Y; Gorshanov, D. L; Gualdoni, C; Guhl, K; Halir, K; Hanna, W; Henry, X; Herald, D; Houdin, G; Ito, Y; Izmailov, I. S; Jacobsen, J; Jones, A; Kamoun, S; Kardasis, E; Karimov, A. M; Khovritchev, M. Y; Kulikova, A. M; Laborde, J; Lainey, V; Lavayssiere, M; Guen, P. Le; Leroy, A; Loader, B; Lopez, O. C; Lyashenko, A. Y; Lyssenko, P. G; Machado, D. I; Maigurova, N; Manek, J; Marchini, A; Midavaine, T; Montier, J; Morgado, B. E; Naumov, K. N; Nedelcu, A; Newman, J; Ohlert, J. M; Oksanen, A; Pavlov, H; Petrescu, E (Oxford University Press on behalf of the Royal Astronomical Society, 2018-03)
    During the 2014–2015 mutual events season, the Institut de M ́ ecanique C ́ eleste et de Calcul des ́ Eph ́ em ́ erides (IMCCE), Paris, France, and the Sternberg Astronomical Institute (SAI), Moscow, Russia, ...
  • 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 ...
  • Photometric and spectroscopic evolution of the peculiar Type IIn SN 2012ab 
    Gangopadhyay, A; Turatto, Massimo; Benetti, Stefano; Misra, K; Brajesh Kumar; Cappellaro, Enrico; Pastorello, Andrea; Tomasella, Lina; Vanni, Sabrina; Fiore, Achille; Morales-Garoffolo, A; Elias-Rosa, Nancy; Singh, Mridweeka; Dastidar, R; Ochner, Paolo; Tartaglia, Leonardo; Brijesh Kumar; Pandey, S. B (Oxford University Press on behalf of the Royal Astronomical Society, 2020-11)
    We present an extensive (∼1200 d) photometric and spectroscopic monitoring of the Type IIn supernova (SN) 2012ab. After a rapid initial rise leading to a bright maximum (MR = −19.39 mag), the light curves show a plateau ...
  • Photometric identification of compact galaxies, stars, and quasars using multiple neural networks 
    Chaini, Siddharth; Bagul, Atharva; Deshpande, Anish; Gondkar, Rishi; Sharma, Kaushal; Vivek, M; Kembhavi, Ajit (Oxford University Press on behalf of Royal Astronomical Society, 2023-01)
    We present MargNet, a deep learning-based classifier for identifying stars, quasars, and compact galaxies using photometric parameters and images from the Sloan Digital Sky Survey Data Release 16 catalogue. MargNet consists ...
  • Photometric identification of objects from Galaxy Evolution Explorer Survey and Sloan Digital Sky Survey 
    Preethi, K; Gudennavar, S. B; Bubbly, S. G; Murthy, J; Brosch, N (Oxford University Press on behalf of the Royal Astronomical Society, 2014-01-01)
    We have used Galaxy Evolution Explorer (GALEX) and Sloan Digital Sky Survey (SDSS) observations to extract seven band photometric magnitudes for over 80 000 objects in the vicinity of the North Galactic Pole. Although these ...
  • Photometric variability of blue straggler stars in M67 with TESS and K2 
    Vernekar, Nagaraj; Subramaniam, A; Jadhav, Vikrant V; Bowman, Dominic M (Oxford University Press on behalf of Royal Astronomical Society, 2023-09)
    Blue straggler stars (BSSs) are formed through mass transfers or mergers in binaries. The recent detections of white dwarf (WD) companions to BSSs in M67 suggested a mass transfer pathway of formation. In search of a close ...
  • 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 ...
  • Precise photometric transit follow-up observations of five close-in exoplanets: update on their physical properties 
    Aritra Chakrabarty; Sengupta, S (IOP Publishing, 2019-07)
    We report the results of the high-precision photometric follow-up observations of five transiting hot Jupiters, WASP-33b, WASP-50b, WASP-12b, HATS-18b, and HAT-P-36b. The observations are made from the 2 m Himalayan Chandra ...
  • SN 2015as: a low-luminosity Type IIb supernova without an early light-curve peak 
    Gangopadhyay, A; Misra, K; Pastorello, A; Sahu, D. K; Tomasella, L; Tartaglia, L; Singh, M; Dastidar, R; Srivastav, S; Ochner, P; Brown, P. J; Anupama, G. C; Benetti, S; Cappellaro, E; Brajesh Kumar; Kumar, B; Pandey, S. B (Oxford University Press on behalf of the Royal Astronomical Society, 2018-05)
    We present results of the photometric (from 3 to 509 days past explosion) and spectroscopic (up to 230 days past explosion) monitoring campaign of the He-rich Type IIb supernova (SN) 2015as. The (B-V) colour evolution of ...
  • SN 2015ba: a Type IIP supernova with a long plateau 
    Dastidar, R; Misra, K; Hosseinzadeh, G; Pastorello, A; Pumo, M. L; Valenti, S; McCully, C; Tomasella, L; Arcavi, I; Elias-Rosa, N; Singh, M; Gangopadhyay, A; Howell, D. A; Morales-Garoffolo, A; Zampieri, L; Kumar, Brijesh; Turatto, M; Benetti, S; Tartaglia, L; Ochner, P; Sahu, D. K; Anupama, G. C; Pandey, S. B (Oxford University Press on behalf of the Royal Astronomical Society, 2018-09)
    We present optical photometry and spectroscopy from about a week after explosion to ∼272 d of an atypical Type IIP supernova, SN 2015ba, which exploded in the edge-on galaxy IC 1029. SN 2015ba is a luminous event with an ...
  • 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 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. ...
  • Spectroscopic study of Herbig Ae/Be stars in the Galactic anti-centre region from LAMOST DR5 
    Nidhi, S; Mathew, Blesson; Shridharan, B; Arun, R; Anusha, R; Kartha, Sreeja S (Oxford University Press on behalf of Royal Astronomical Society, 2023-10)
    We study a sample of 119 Herbig Ae/Be stars in the Galactic anti-centre direction using the spectroscopic data from large sky area multi-object fiber spectroscopic telescope survey program. Emission lines of hydrogen ...
  • 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 ...
  • A study of the star-forming regions in the spiral galaxy NGC 2336 using the Ultraviolet Imaging Telescope (UVIT) 
    Rahna, P. T; Mousumi Das; Murthy, J; Gudennavar, S. B; Bubbly, S. G (Oxford University Press on behalf of the Royal Astronomical Society, 2018-11)
    We present a far-ultraviolet (FUV) and near-ultraviolet (NUV) imaging study at 1.2 arcsec resolution of recent star formation in the nearby spiral galaxy NGC 2336 using the Ultraviolet Imaging Telescope (UVIT) on-board ...
  • A study of the starless dark cloud LDN 1570: Distance, dust properties, and magnetic field geometry 
    Eswaraiah, C; Maheswar, G; Pandey, A. K; Jose, J; Ramaprakash, A. N; Bhatt, H. C (EDP Sciences, 2013-08)
    Aims. We aim to map the magnetic field geometry and to study the dust properties of the starless cloud, L1570, using multi-wavelength optical polarimetry and photometry of the stars projected on the cloud. Methods. The ...
  • 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 ...

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