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Light curves of five type Ia supernovae at intermediate redshift

Abstract : 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. Based on joint observations made through the Isaac Newton Groups' Wide Field Camera Survey Programme with the Isaac Newton Telescope and the Jacobus Kapteyn Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. Part of the data presented here have also been taken using ALFOSC, which is owned by the Instituto de Astrofisica de Andalucia (IAA) and operated at the Nordic Optical Telescope under agreement between IAA and the NBIfAFG of the Astronomical Observatory of Copenhagen. Figure 2 and Table 2 are only available in electronic form at http://www.aanda.org
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Submitted on : Wednesday, February 10, 2010 - 9:44:33 AM
Last modification on : Wednesday, October 21, 2020 - 4:32:13 PM

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R. Amanullah, V. Stanishev, A. Goobar, K. Schahmaneche, P. Astier, et al.. Light curves of five type Ia supernovae at intermediate redshift. Astronomy and Astrophysics - A&A, EDP Sciences, 2008, 486, pp.375-382. ⟨10.1051/0004-6361:20079070⟩. ⟨in2p3-00455301⟩

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