| Title: | Exploring the Universe with supernovae |
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| Authors: | ID Petrushevska, Tanja (Author) |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.10 - Published Scientific Conference Contribution Abstract (invited lecture) |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | Supernovae have proven to be exquisite tools for a variety of astrophysics and cosmology topics. In this lecture, I will highlight a selection of dedicated tele- scopic surveys for detecting supernovae and I will report some of our interesting discoveries during the past few years. I will dedicate special attention to strongly lensed supernovae by galaxies and galaxy clusters. Under the right circumstances, multiple images of the lensed supernovae can be observed, and due to the variable nature of the objects, the difference between the arrival times of the images can be measured. Since the images have taken different paths through space before reaching us, the time-differences are sensitive to the expansion rate of the universe. Therefore, measuring time delays from strongly lensed supernovae is emerging as a novel and independent tool for estimating the Hubble constant (H0). This is very important given the recent discord in the value of H0 from two methods that probe different distance ranges: the ESA mission Planck value corresponds to 67.74 ± 0.46 km s−1 Mpc−1; [1], while a reanalysis of the local distance scale gives 73.24 ± 1.74 km s−1 Mpc−1; [2, 3], these measurements thus being inconsistent at the ≈ 3.5σ level. Therefore, the results of additional independent and high- precision techniques, which rely on different physics, are of key importance. In this context, I will report our discovery of the first resolved multiply-imaged gra- vitationally lensed supernova Type Ia [4]. Moving forward, I will discuss some of the prospects of upcoming facilities such as the Large Synoptic Survey Telescope and James Webb Space Telescope [5, 6]. |
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| Keywords: | supernovae, strong lensing, neutron stars |
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| Publication status: | Published |
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| PID: | 20.500.12556/RUNG-4258-2cf88697-329e-e6e9-1b4f-49cdeaaded6e |
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| COBISS.SI-ID: | 5273851 |
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| NUK URN: | URN:SI:UNG:REP:WXOLFT8W |
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| Publication date in RUNG: | 29.11.2018 |
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| Views: | 2996 |
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| Downloads: | 0 |
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