the transient universe: ay 250 spring 2007 future observations of sn ia geoff bower
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The Transient Universe: AY 250 Spring 2007
Future Observations of SN IA
Geoff Bower
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The Transient Universe: AY 250 Spring 2007
SN Ia
SN 2002hpFrom GOODS
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The Transient Universe: AY 250 Spring 2007
Type Ia Supernovae and Cosmology
Filippenko 2003
H0 = 72 +/- 8 km/s/Mpc
Omega_lambda = 0.7
Omega_m = 0.3
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The Transient Universe: AY 250 Spring 2007
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The Transient Universe: AY 250 Spring 2007
Stretch Correction
• Time dilation correction
• The more luminous the SN, the longer the timescale
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The Transient Universe: AY 250 Spring 2007
Goals of Supernova Searches
• Nearby SNe– Calibrate stretch
relations– Dependence on
environment, SN host– SN rate – Physical
understanding of progenitor(s), events, & calibrations
• Distant SNe– Add points to
magnitude-redshift relation
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The Transient Universe: AY 250 Spring 2007
Two Future Directions
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The Transient Universe: AY 250 Spring 2007
SNAP
• Space mission• 2m telescope• 1 sq deg FOV• Small NIR imager• Spectrometer
– 0.3 – 1.7 microns
• Survey 20 sq degrees
• 2000 SN IA/year– Z = 0.1 – 1.7
• Full light curves– 2 to 80 days
• Tight control of systematics
Perlmutter et al 2004
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The Transient Universe: AY 250 Spring 2007
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The Transient Universe: AY 250 Spring 2007
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The Transient Universe: AY 250 Spring 2007
Separating Cosmological Constant from Quintessence
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The Transient Universe: AY 250 Spring 2007
System Design
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The Transient Universe: AY 250 Spring 2007
System Design
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The Transient Universe: AY 250 Spring 2007
Redshift Dependence of Results
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The Transient Universe: AY 250 Spring 2007
Quality of Space-Based PSF
Z=0.83
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The Transient Universe: AY 250 Spring 2007
Space-Based Observations Win Over Ground-Based
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The Transient Universe: AY 250 Spring 2007
Comparison with Other Facilities
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The Transient Universe: AY 250 Spring 2007
LSST
• Ground-based telescope
• 8 meter• 5 colors• Two observing modes
– All sky every 3 days– Staring
• Photo-red shift only– Delta Z ~ 0.01
• 250,000 SN IA/year in all sky– Z <0.8
• 14,000 in Staring mode– Z < 1.4
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The Transient Universe: AY 250 Spring 2007
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The Transient Universe: AY 250 Spring 2007
Wang et al 2005
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The Transient Universe: AY 250 Spring 2007
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The Transient Universe: AY 250 Spring 2007
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The Transient Universe: AY 250 Spring 2007
Summary
• SNAP– Limited number– Small FOV
– Spectroscopy– Control of systematics– No gaps due to
weather
• LSST– Many objects– Whole sky
– Photo-z
– Simultaneous BAO– Hubble constant
measurement