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Constructing the Hubble Diagram from a sample of Type Ia Supernovae
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The astounding discovery of a universe expanding with positive acceleration, has called for the existence of a hypothetical new constitute of the universe tagged as dark energy. Even though the positive acceleration of the cosmos has been confirmed, questions regarding the nature of this new constitute remain unanswered. The first signatures of this sensational discovery were initially revealed by the Hubble diagram constructed by a sample of Type Ia supernovae with redshifts predominantly smaller than 1 ( z < 1). However in order to comprehend the features of dark energy information regarding the behavior of the Hubble curve at redshifts lower than 0.1 and higher than 1 are needed. Type Ia supernovae with a redshift lower than 0.1 (z<0.1) are relatively observed less in compare to supernovae with redshift 0.1< z < 1. In order to understand the nature of dark energy different surveys have been constructing the Hubble diagram for Type Ia’s with z<0.1. Members of Yale’s La Silla-Quest Survey (LSQ) has been actively involved in discovering and constructing photometric light curves from a large sample of low redshift Type Ia supernovae (z<0.1). The supernovae of this sample were initially discovered through exploiting the 10 square degree QUEST camera installed on the ESO Schmidt telescope located at the La Silla Observatory Chile. In order to generate photometric light curves the Carnegie Supernova Project II (CSP) and the Las Cumbres Observatory Global Telescope Network (LCOGT) continuously observed these objects and produced a precious data set for 46 Type Ia supernovae. In this thesis I go through the methods and analyses that resulted in the construction of light curves for LSQ’s sample of Type Ia supernovae. I also discuss using the SALT 2.4 supernova light curve fitter for analyzing the photometric data and building the Hubble diagram for our sample. The results of SALT 2.4 analysis gives us an intrinsic spread of 14 %, an absolute B band magnitude of -19.086, a stretch coefficient of 0.114, and a color correction of 2.436, which are consistent with other photometric supernovae samples.

Place, publisher, year, edition, pages
2015. , 103 p.
Keyword [en]
Technology, Yale University, La Silla-Quest Survey (LSQ), Carnegie Supernova Project II (CSP), Las Cumbres Observatory Global Telescope Network (LCOGT)
Keyword [sv]
URN: urn:nbn:se:ltu:diva-46062Local ID: 3b432f32-1ad6-42a8-9d2f-680899172443OAI: diva2:1019371
External cooperation
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Validerat; 20150630 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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