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Applying the expanding photosphere and standardized candle methods to Type II-Plateau supernovae at cosmologically significant redshifts
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Number of Authors: 6
2016 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 592, A129Article in journal (Refereed) Published
Abstract [en]

Based on optical imaging and spectroscopy of the Type II-Plateau SN 2013eq, we present a comparative study of commonly used distance determination methods based on Type II supernovae. The occurrence of SN 2013eq in the Hubble flow (z = 0.041 +/- 0.001) prompted us to investigate the implications of the difference between angular and luminosity distances within the framework of the expanding photosphere method (EPM) that relies upon a relation between flux and angular size to yield a distance. Following a re-derivation of the basic equations of the EPM for SNe at non-negligible redshifts, we conclude that the EPM results in an angular distance. The observed flux should be converted into the SN rest frame and the angular size, theta, has to be corrected by a factor of (1 + z)(2). Alternatively, the EPM angular distance can be converted to a luminosity distance by implementing a modification of the angular size. For SN 2013eq, we find EPM luminosity distances of D-L = 151 +/- 18 Mpc and D-L = 164 +/- 20 Mpc by making use of different sets of dilution factors taken from the literature. Application of the standardized candle method for Type II-P SNe results in an independent luminosity distance estimate (D-L = 168 +/- 16 Mpc) that is consistent with the EPM estimate.

Place, publisher, year, edition, pages
2016. Vol. 592, A129
Keyword [en]
supernovae: individual: SN 2013eq, distance scale
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-135987DOI: 10.1051/0004-6361/201628333ISI: 000384722600105OAI: oai:DiVA.org:su-135987DiVA: diva2:1050324
Available from: 2016-11-28 Created: 2016-11-28 Last updated: 2016-11-28Bibliographically approved

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Kromer, Markus
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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