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

May 18, 2010Nick Cowan's Talk at ESMSSP2 “Habitable” Planets

May 18, 2010Nick Cowan's Talk at ESMSSP3 Looking for Water Water in atmosphere? –H 2 O vapor –Variable cloud cover Water on surface? –Color of oceans –Glint of oceans –Polarization from oceans Long-Exposure Spectroscopy Daily Variability } } Yearly Variability

May 18, 2010Nick Cowan's Talk at ESMSSP4 NWO, THEIA, TPF/Darwin, etc. (n+1 decades from now) (Simulated image from Oakley & Cash 2009) A.Long-Exposure Spectroscopy B.Time-Resolved Photometry

May 18, 2010Nick Cowan's Talk at ESMSSP5 Oakley & Cash (2009) Orbital & Rotational Variability time flux Will not know A 0 (degenerate with R p ) Will measure A(t)/A 0 and A( )/A 0

May 18, 2010Nick Cowan's Talk at ESMSSP6 EPOXI (PI: A'Hearn) ~Deep Impact Part II EPOCh (PI: Deming) 1.Observe known exoplanets 2.Observe Earth as an exoplanet

May 18, 2010Nick Cowan's Talk at ESMSSP7 EPOXI Light Curves

May 18, 2010Nick Cowan's Talk at ESMSSP8 EPOXI Light Curves Cowan et al. (2009)

May 18, 2010Nick Cowan's Talk at ESMSSP9 Backward Modeling v.s. Forward Modeling Data Simple Model Sophisticated Simulation Assumptions Parameters Data Starved Data Rich

May 18, 2010Nick Cowan's Talk at ESMSSP10 Forward (Predictive) Modeling

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

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

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

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

May 18, 2010Nick Cowan's Talk at ESMSSP15 Backward (Interpretive) Modeling

May 18, 2010Nick Cowan's Talk at ESMSSP16 Time-Averaged Spectrum Cowan et al. (2009) 1) Clouds are plentiful and bright 2)Can we learn about planetary surface despite them?

May 18, 2010Nick Cowan's Talk at ESMSSP17 Principal Component Analysis FaFa FbFb C1C1 C2C2

May 18, 2010Nick Cowan's Talk at ESMSSP18 Eigencolors Cowan et al. (2009)

May 18, 2010Nick Cowan's Talk at ESMSSP19 Earth from Above Cowan et al. (in prep)

May 18, 2010Nick Cowan's Talk at ESMSSP20 Northern Eigencolors Cowan et al. (in prep)

May 18, 2010Nick Cowan's Talk at ESMSSP21 Earth from Below Cowan et al. (in prep)

May 18, 2010Nick Cowan's Talk at ESMSSP22 Southern Eigencolors Cowan et al. (in prep)

May 18, 2010Nick Cowan's Talk at ESMSSP23 Reflected Light Diffuse (Lambert) Reflection Specular (Shiny) Reflection

May 18, 2010Nick Cowan's Talk at ESMSSP24 Specular Reflection (it’s small) Williams & Gaidos (2008)

May 18, 2010Nick Cowan's Talk at ESMSSP25 Equatorial Map Cowan et al. (2009)

May 18, 2010Nick Cowan's Talk at ESMSSP26 A Different Kind of Map 1)Simulated white light curve of Earth with real cloud cover 2) Can’t recover major landforms Oakley & Cash (2009)

May 18, 2010Nick Cowan's Talk at ESMSSP27 Conclusion From VPL Time-Resolved, Multi-Band Photometry Complements Time-Averaged Spectroscopy