Supernova Rates: Today, and with the New HST
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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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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:


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


Type Ia supernova: oxygen

Accretion on, or merging of,

C/O WD, up to ~MChandra .

Carbon ignition under degenerate conditions:

Thermonuclear runaway



SN-Ia “delay time distribution” oxygen

SN-Ia Rate (t)

t


But: oxygen (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)


Star-formation history (z) oxygen

SN delay time distribution (t)

*

=

SN rate (z)



Peak in SN-Ia rate at z~0.8 implies ~80 SNe, 46 SNe-Ia, 24 @ z>1t > 3 Gyr; inconsistent with expected dominance of “prompt” channel when SFR was 10X greater than today.


Need better/larger samples. ~80 SNe, 46 SNe-Ia, 24 @ z>1

but

HST/GOODSvery expensive (~700 orbits).

Can it be done from the ground?


A deep sn survey in the subaru deep field
A deep SN survey in the Subaru Deep Field ~80 SNe, 46 SNe-Ia, 24 @ z>1

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


0.2% of the field ~80 SNe, 46 SNe-Ia, 24 @ z>1


33 SNe in 2 nights: ~80 SNe, 46 SNe-Ia, 24 @ z>1

Record-holder: Most distant SN withspec-z (1.56)


Every additional epoch adds ~40 SNe: ~80 SNe, 46 SNe-Ia, 24 @ z>1

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


Going to higher redshift with the new HST… ~80 SNe, 46 SNe-Ia, 24 @ z>1


Surveying for high-z SNe with WFC3: ~80 SNe, 46 SNe-Ia, 24 @ z>1

(predictions by K. Sharon)


Potential for SNe out to z~2.5: ~80 SNe, 46 SNe-Ia, 24 @ z>1

(predictions by K. Sharon)


  • Conclusions: ~80 SNe, 46 SNe-Ia, 24 @ z>1

  • 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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