Study of supernovae and massive stars and prospects with the 4m International Liquid Mirror Telescope
Université de Liège, Liège, Belgique, 2014
Online
Hochschulschrift
Zugriff:
Massive stars are the progenitors of the most energetic explosions in the Universe such as core-collapse supernovae (CCSNe) and gamma ray bursts. During their life time they follow various evolutionary phases (e.g. supergiant, luminous blue variable and Wolf-Rayet). They strongly influence their environments through their energetic ionization radiation and powerful stellar winds. Furthermore, the formation of low- and intermediate-mass stars are also being regulated by them. The Carina nebula region, which hosts a large population of massive stars and several young star clusters, provides an ideal target for studying the feedback of massive stars. In this thesis, we investigated a wide field (32′ × 31′ ) region located in the west of the Carina nebula and centered on the massive binary WR 22. For our study, we used new optical photometry (UBVRI Hα), along with some low resolution spectroscopy, archival near infra-red (2MASS), and X-ray (Chandra, XMM-Newton) data. We estimated several parameters such as reddening, reddening law, etc. and also identified young stellar objects located in the region under study (Kumar et al., 2014b). Among the various types of CCSNe, Type IIb are recognized with their typical observational properties. Some of them show clear indication of double peaks in their light curves. The spectral features of these SNe show a transition between Type II and Type Ib/c events at early and later epochs, respectively. It has been noticed that the occurrence of these events is not common in volume limited surveys.In this thesis we have studied the properties of the light curve and spectral evolutionof the Type IIb supernova 2011fu. The observational properties of this object showresemblance to those of SN 1993J with a possible signature of the adiabatic coolingphase (Kumar et al., 2013).When light passes through the expanding ejecta of the SNe, it retains informationabout the orientation of the ejected layers. In general, CCSNe exhibit a significantlevel of polarization during various phases of their evolution at different wavelengths.We have investigated the broad band polarimetric properties of a Type II plateauSN 2012aw and compared it with other well-studied CCSNe of similar kinds (Kumaret al., 2014a). In the framework of the present thesis, we have also contributed to the development of the 4m International Liquid Mirror Telescope (ILMT) project which isa joint collaborative effort among different universities and research institutes in Belgium, India, Canada and Poland. We performed various experiments includingthe spin casting of the primary mirror, optical quality tests of the mercury surface,mylar film experiments, etc. The possible scientific capabilities and future contri-butions of this telescope are also discussed. We propose our plans to identify thetransients (specially supernovae) with the ILMT and their further follow-up scheme.The installation of the ILMT will start very soon at the Devasthal observatory,ARIES Nainital, India.
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Study of supernovae and massive stars and prospects with the 4m International Liquid Mirror Telescope
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Autor/in / Beteiligte Person: | Kumar, Brajesh ; Surdej / Pandey S.B., superviser |
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Veröffentlichung: | Université de Liège, Liège, Belgique, 2014 |
Medientyp: | Hochschulschrift |
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