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LSST and SNAP Complementarity in Dark Energy Studies

Learn about the complementarity between LSST and SNAP instruments in advancing research on dark energy and dark matter. Explore their apparatus, surveys, and strategies for supernovae and weak lensing studies. Discover how they yield improved constraints on cosmological parameters.

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LSST and SNAP Complementarity in Dark Energy Studies

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  1. LSST-SNAP complementarity Reynald Pain IN2P3/LPNHE Paris, France 9/18/2008

  2. LSST vs SNAP (and vice-versa) • True: • Target Dark Energy (and Dark Matter) as primary science • Use wide field imager as (main) instrument • Hope to start operating in ~2015 • Are competing for (some of) the same money • But … 9/18/2008

  3. LSST & SNAP apparatus • Primary mirror : ~2m • Field-of-view : ~ 1 deg2 • 6 filters in the visible : • 320 nm -> 1100 nm • 3 filters in NIR (->1700 nm) • low-z spectrograph • Primary mirror : 8.4 m • Field-of-view : ~ 10 deg2 • 6 filters in the visible : • 320 nm -> 1100 nm 9/18/2008

  4. LSST & SNAP surveys LSST Survey SNAP Survey Area(sq.deg) Depth(AB mag) ngal(arcmin-2) Ngal Deep/SNe 15 30.3 250 107 Wide 4000 27.8 100 108.5 Panoramic 7000-10000 26.7 40-50 109 9/18/2008

  5. SNAP & LSST strategies for Supernovae SNAP: Area : 2x7.5 sq. deg. Cadence : 4 days Imaging and spectroscopy Total nb of SN : ~ 2000 LSST: full sky, twice a week => 250000 SN/yr ! well measured subsample at z<1 Some DE models require SN at z>1 Dust modeling requires IR meas. Need for “nearby” SN (ground) Light curve modeling requires lots of SN 9/18/2008

  6. SNAP & LSST strategies for Weak Lensing SNAP: increase the number of resolved galaxies (spatial resolution) and PSF stability LSST: 200 exposures per sky patch will yield negligible PSF induced shear systematics Cosmic shear signal Stars 9-band photometry (incl NIR) helps for phot-z SNAP and LSST will have very different systematic uncertainties 9/18/2008

  7. LSST and SNAP Rely on the same techniques (SN, WL, BAO, ..) to constraint DE but use a very different instrumental approach DE is a difficult measurement. Improving on current (+ near future) constraints will be extremely difficult and will in fine come tohow well one does on controlling the systematic uncertainties LSST and SNAP are complementarity in particular when dealing with systemactic uncertainties Combined, they will yield improved constraints on Dark Energy 9/18/2008

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  9. Cosmological parameters (1st year) 68.3, 95.5 and 99.7% CL Green SNLS, Blue SDSS/BAO 2005 WM = 0.271 +/- 0.021 (stat) +/- 0.007 (syst) w = -1.023 +/- 0.090 (stat) +/- 0.054 (syst) 9/18/2008

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