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Supernova Rates: Today, and with the New HST Dan Maoz

Supernova Rates: Today, and with the New HST Dan Maoz. Riess et al. (2004, 2007) + Astier et al. (2006). W m =0.3 , W L =0.7. W m =1 , W L =0. But supernova rates are also very interesting:. Supernovae: source of essentially all elements heavier than oxygen.

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Supernova Rates: Today, and with the New HST Dan Maoz

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  1. Supernova Rates: Today, and with the New HST Dan Maoz

  2. Riess et al. (2004, 2007) + Astier et al. (2006) Wm=0.3, WL=0.7 Wm=1, WL=0 But supernova rates are also very interesting:

  3. Supernovae: source of essentially all elements heavier than oxygen By measuring SN rates vs. redshift we can see cosmic metal enrichment in action! + Figure out what is exploding in type-Ia’s

  4. Type Ia supernova: Accretion on, or merging of, C/O WD, up to ~MChandra . Carbon ignition under degenerate conditions: Thermonuclear runaway

  5. Yungelson & Livio (2000)

  6. SN-Ia “delay time distribution” SN-Ia Rate (t) t

  7. But: (Mannucci et al. 2005) SN-Ia rate is proportional to star-formation rate! Locally, ~1/2SNe-Ia : “prompt” (~0.1 Gyr) and ~1/2 SNe-Ia “tardy” (~5 Gyr)

  8. Star-formation history (z) SN delay time distribution (t) * = SN rate (z)

  9. HST/ACS GOODS (~700 orbits) Riess et al. 2004, 2007, ~80 SNe, 46 SNe-Ia, 24 @ z>1

  10. Peak in SN-Ia rate at z~0.8 implies t > 3 Gyr; inconsistent with expected dominance of “prompt” channel when SFR was 10X greater than today.

  11. Need better/larger samples. but HST/GOODSvery expensive (~700 orbits). Can it be done from the ground?

  12. A deep SN survey in the Subaru Deep Field D. Poznanski et al 2007 • 2-night runs on Subaru/Suprime-Cam, 0.25 deg2 field • Re-image the SDF: r, i ~ 27 mag z ~ 26 mag Single-epoch photometric SN classification

  13. 0.2% of the field

  14. 33 SNe in 2 nights: Record-holder: Most distant SN withspec-z (1.56)

  15. Every additional epoch adds ~40 SNe: After two more successful runs in Feb and May 2007, + more in June 2008 ~150-200 SNe. Soon: similar project with LBT-Italy on COSMOS field

  16. Going to higher redshift with the new HST…

  17. Surveying for high-z SNe with WFC3: (predictions by K. Sharon)

  18. Potential for SNe out to z~2.5: (predictions by K. Sharon)

  19. Conclusions: • WFC3 can see SNe-Ia out to z~2.5, if there. • 2. Will show if SN-Ia have short/long delay at high z. • 3. Potentially extend Hubble diagram to decelaration era. • 4. Find core-collapse SNe at z>1: SFR • 5. Metal-enrichment in action over most of age of Universe.

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