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The EPOXI View of Earth

The EPOXI View of Earth. Nick Cowan (University of Washington) KITP (May 18, 2010). “Habitable” Planets. Looking for Water. }. Daily Variability. Water in atmosphere? H 2 O vapor Variable cloud cover Water on surface? Color of oceans Glint of oceans Polarization from oceans.

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The EPOXI View of Earth

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  1. The EPOXI View of Earth Nick Cowan (University of Washington) KITP (May 18, 2010)

  2. “Habitable” Planets Nick Cowan's Talk at ESMSSP

  3. Looking for Water } Daily Variability • Water in atmosphere? • H2O vapor • Variable cloud cover • Water on surface? • Color of oceans • Glint of oceans • Polarization from oceans Long-Exposure Spectroscopy } Yearly Variability Nick Cowan's Talk at ESMSSP

  4. NWO, THEIA, TPF/Darwin, etc.(n+1 decades from now) Long-Exposure Spectroscopy Time-Resolved Photometry (Simulated image from Oakley & Cash 2009) Nick Cowan's Talk at ESMSSP

  5. Orbital & Rotational Variability flux Oakley & Cash (2009) time • Will not know A0 (degenerate with Rp) • Will measure A(t)/A0 and A()/A0 Nick Cowan's Talk at ESMSSP

  6. EPOXI (PI: A'Hearn)~Deep Impact Part II EPOCh (PI: Deming) • Observe known exoplanets • Observe Earth as an exoplanet Nick Cowan's Talk at ESMSSP

  7. EPOXI Light Curves Nick Cowan's Talk at ESMSSP

  8. EPOXI Light Curves Cowan et al. (2009) Nick Cowan's Talk at ESMSSP

  9. Backward Modeling v.s. Forward Modeling Simple Model Data Starved Assumptions Data Parameters Sophisticated Simulation Data Rich Nick Cowan's Talk at ESMSSP

  10. Forward (Predictive) Modeling Nick Cowan's Talk at ESMSSP

  11. RMSE = 1.9% Data RMSE = 2.3% Model time March 19th, 2008 (Robinson et al. 2010) RMSE = 2.0% RMSE = 1.6%

  12. RMSE = 1.9% Data RMSE = 2.3% Model time March 19th, 2008 RMSE = 2.0% RMSE = 1.6%

  13. RMSE = 2.8% Data RMSE = 3.5% Model time June 5th, 2008 (Robinson et al. 2010) RMSE = 3.7% RMSE = 3.7%

  14. RMSE = 2.8% Data RMSE = 3.5% Model time June 5th, 2008 RMSE = 3.7% RMSE = 3.7%

  15. Backward (Interpretive) Modeling Nick Cowan's Talk at ESMSSP

  16. Time-Averaged Spectrum 1) Clouds are plentiful and bright Can we learn about planetary surface despite them? Cowan et al. (2009) Nick Cowan's Talk at ESMSSP

  17. Principal Component Analysis C2 C1 <C> Fb Fa Nick Cowan's Talk at ESMSSP

  18. Eigencolors Cowan et al. (2009) Nick Cowan's Talk at ESMSSP

  19. Earth from Above Cowan et al. (in prep) Nick Cowan's Talk at ESMSSP

  20. Northern Eigencolors Cowan et al. (in prep) Nick Cowan's Talk at ESMSSP

  21. Earth from Below Cowan et al. (in prep) Nick Cowan's Talk at ESMSSP

  22. Southern Eigencolors Cowan et al. (in prep) Nick Cowan's Talk at ESMSSP

  23. Reflected Light Diffuse (Lambert) Reflection Specular (Shiny) Reflection Nick Cowan's Talk at ESMSSP

  24. Specular Reflection (it’s small) Williams & Gaidos (2008) Nick Cowan's Talk at ESMSSP

  25. Equatorial Map Cowan et al. (2009) Nick Cowan's Talk at ESMSSP

  26. A Different Kind of Map Simulated white light curve of Earth with real cloud cover 2) Can’t recover major landforms Oakley & Cash (2009) Nick Cowan's Talk at ESMSSP

  27. Conclusion Time-Resolved, Multi-Band PhotometryComplements Time-Averaged Spectroscopy From VPL Nick Cowan's Talk at ESMSSP

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