Amanullah, R. and Stanishev, V. and Goobar, A. and Schahmaneche, K. and Astier, P. and Balland, C. and Ellis, R. S. and Fabbro, S. and Hardin, D. and Hook, I. M. and Irwin, M. J. and McMahon, R. G. and Mendez, J. M. and Mouchet, M. and Pain, R. and Ruiz-Lapuente, P. and Walton, N. A. (2008) Light curves of five type Ia supernovae at intermediate redshift. Astronomy and Astrophysics, 486 (2). pp. 375-382. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:AMAaanda08
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Aims. We present multi-band light curves and distances for five type Ia supernovae at intermediate redshifts, 0.18 < z < 0.27. Methods. Three telescopes on the Canary Island of La Palma, INT, NOT, and JKT, were used for discovery and follow-up of type Ia supernovae in the g' and r' filters. Supernova fluxes were measured by simultaneously fitting a supernova and host galaxy model to the data, and then calibrated using star catalogues from the Sloan Digital Sky Survey. Results. The light curve shape and colour corrected peak luminosities are consistent with the expectations of a flat ΛCDM universe at the 1.5σ level. One supernova in the sample, SN1999dr, shows surprisingly large reddening, considering both that it is located at a significant distance from the core of its host (~4 times the fitted exponential radius) and that the galaxy can be spectroscopically classified as early-type with no signs of ongoing star formation.
|Additional Information:||© ESO 2008.Received 14 November 2007 / Accepted 21 April 2008. The authors would like to thank David Rubin at UC Berkeley for assisting in parts of the analysis. Ariel Goobar and Vallery Stanishev would like to thank the Göran Gustafsson Foundation for financial support.|
|Subject Keywords:||cosmology: observations; cosmology: cosmological parameters; cosmology: distance scale; stars: supernovae: general|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||25 Jun 2009 19:10|
|Last Modified:||26 Dec 2012 10:50|
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