Type-Ia supernova rates to redshift 2.4 from CLASH: the Cluster Lensing And Supernova survey with Hubble

Or Graur*, S. A. Rodney, D. Maoz, A. G. Riess, S. W. Jha, M. Postman, T. Dahlen, T. W. -S. Holoien, C. McCully, B. Patel, L. -G. Strolger, N. Benitez, D. Coe, S. Jouvel, E. Medezinski, A. Molino, M. Nonino, L. Bradley, A. Koekemoer, I. BalestraS. B. Cenko, K. I. Clubb, M. E. Dickinson, A. V. Filippenko, T. F. Frederiksen, P. Garnavich, J. Hjorth, D. O. Jones, B. Leibundgut, T. Matheson, B. Mobasher, P. Rosati, J. M. Silverman, V. U, K. Jedruszczuk, C. Li, K. Lin, M. Mirmelstein, J. Neustadt, A. Ovadia, E. H. Rogers

*Corresponding author for this work

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We present the supernova (SN) sample and Type-Ia SN (SN Ia) rates from the Cluster Lensing And Supernova survey with Hubble (CLASH). Using the Advanced Camera for Surveys and the Wide Field Camera 3 on the Hubble Space Telescope (HST), we have imaged 25 galaxy-cluster fields and parallel fields of non-cluster galaxies. We report a sample of 27 SNe discovered in the parallel fields. Of these SNe, ~13 are classified as SN Ia candidates, including four SN Ia candidates at redshifts z > 1.2. We measure volumetric SN Ia rates to redshift 1.8 and add the first upper limit on the SN Ia rate in the range 1.8 < z < 2.4. The results are consistent with the rates measured by the HST/GOODS and Subaru Deep Field SN surveys. We model these results together with previous measurements at z < 1 from the literature. The best-fitting SN Ia delay-time distribution (DTD; the distribution of times that elapse between a short burst of star formation and subsequent SN Ia explosions) is a power law with an index of -1.00 +0.06(0.09) -0.06(0.10) (statistical) +0.12 -0.08 (systematic), where the statistical uncertainty is a result of the 68% and 95% (in parentheses) statistical uncertainties reported for the various SN Ia rates (from this work and from the literature), and the systematic uncertainty reflects the range of possible cosmic star-formation histories. We also test DTD models produced by an assortment of published binary population synthesis (BPS) simulations. The shapes of all BPS double-degenerate DTDs are consistent with the volumetric SN Ia measurements, when the DTD models are scaled up by factors of 3-9. In contrast, all BPS single-degenerate DTDs are ruled out by the measurements at a >99% significance level.
Original languageEnglish
Article number28
Number of pages19
JournalThe Astrophysical Journal
Issue number1
Publication statusPublished - 10 Feb 2014




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