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Spectroscopy of twelve type Ia supernovae at intermediate redshift

Abstract : We present spectra of twelve type Ia supernovae obtained in 1999 at the William Herschel Telescope and the Nordic Optical Telescope during a search for type Ia supernovae (SN Ia) at intermediate redshift. The spectra range from z=0.178 to z=0.493, including five high signal-to-noise ratio SN Ia spectra in the still largely unexplored range 0.15≤ z ≤ 0.3. Most of the spectra were obtained before or around restframe B-band maximum light. None of them shows the peculiar spectral features found in low-redshift over- or under-luminous SN Ia. Expansion velocities of characteristic spectral absorption features such as Si ii at 6355 Å, S ii at 5640 Å and Ca ii at 3945 Å are found to be consistent with those of their low-z SN Ia counterparts.
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Submitted on : Wednesday, February 10, 2010 - 10:10:13 AM
Last modification on : Monday, January 4, 2021 - 2:44:02 PM

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C. Balland, M. Mouchet, R. Pain, N. A. Walton, R. Amanullah, et al.. Spectroscopy of twelve type Ia supernovae at intermediate redshift. Astronomy and Astrophysics - A&A, EDP Sciences, 2006, 445, pp.387-402. ⟨10.1051/0004-6361:20053552⟩. ⟨in2p3-00455315⟩



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