A1 Refereed original research article in a scientific journal

See Change: VLT spectroscopy of a sample of high-redshift Type Ia supernova host galaxies




AuthorsS. C. Williams, I. M. Hook, B. Hayden, J. Nordin, G. Aldering, K. Boone, A. Goobar , C. E. Lidman , S. Perlmutter, D. Rubin, P. Ruiz-Lapuente, C. Saunders

PublisherOXFORD UNIV PRESS

Publication year2020

JournalMonthly Notices of the Royal Astronomical Society

Journal name in sourceMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Journal acronymMON NOT R ASTRON SOC

Volume495

Issue4

First page 3859

Last page3880

Number of pages22

ISSN0035-8711

eISSN1365-2966

DOIhttps://doi.org/10.1093/mnras/staa1319

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/50013890


Abstract
The Supernova Cosmology Project has conducted the 'See Change' programme, aimed at discovering and observing high-redshift (1.13 <= z <= 1.75) Type Ia supernovae (SNe Ia). We used multifilter Hubble Space Telescope (HST) observations of massive galaxy clusters with sufficient cadence to make the observed SN Ia light curves suitable for a cosmological probe of dark energy at z > 0.5. This See Change sample of SNe Ia with multi-colour light curves will be the largest to date at these redshifts. As part of the See Change programme, we obtained ground-based spectroscopy of each discovered transient and/or its host galaxy. Here, we present Very Large Telescope (VCT) spectra of See Change transient host galaxies, deriving their redshifts, and host parameters such as stellar mass and star formation rate. Of the 39 See Change transients/hosts that were observed with the VLT, we successfully determined the redshift for 26, including 15 SNe Ia at z > 0.97. We show that even in passive environments, it is possible to recover secure redshifts for the majority of SN hosts out to z = 1.5. We find that with typical exposure times of 3-4h on an 8-m-class telescope we can recover similar to 75 per cent of SN Ia redshifts in the range of 0.97 < z < 1.5. Furthermore, we show that the combination of HST photometry and VLT spectroscopy is able to provide estimates of host galaxy stellar mass that are sufficiently accurate for use in a mass-step correction in the cosmological analysis.

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