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

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  • 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. Balestra
  • S. 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
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


  • Graur_2014_ApJ_783_28

    Rights statement: O. Graur et al 2014 ApJ 783 28. © 2014. Reproduced by permission of the AAS.

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