the epoxi view of earth
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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. - PowerPoint PPT PresentationTRANSCRIPT
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The EPOXI View of Earth
Nick Cowan (University of Washington) KITP (May 18, 2010)
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May 18, 2010 Nick Cowan's Talk at ESMSSP 2
“Habitable” Planets
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May 18, 2010 Nick Cowan's Talk at ESMSSP 3
Looking for Water
• Water in atmosphere?– H2O vapor
– Variable cloud cover
• Water on surface?– Color of oceans– Glint of oceans– Polarization from oceans
Long-ExposureSpectroscopy
DailyVariability}}
YearlyVariability
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May 18, 2010 Nick Cowan's Talk at ESMSSP 4
NWO, THEIA, TPF/Darwin, etc.(n+1 decades from now)
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(Simulated image from Oakley & Cash 2009)
A. Long-Exposure SpectroscopyB.Time-Resolved Photometry
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May 18, 2010 Nick Cowan's Talk at ESMSSP 5
Oak
ley
& C
ash
(200
9)
Orbital & Rotational Variability
time
flux
• Will not know A0 (degenerate with Rp)
• Will measure A(t)/A0 and A()/A0
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May 18, 2010 Nick Cowan's Talk at ESMSSP 6
EPOXI (PI: A'Hearn) ~Deep Impact Part II
EPOCh (PI: Deming)1. Observe known
exoplanets
2. Observe Earth as an exoplanet
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May 18, 2010 Nick Cowan's Talk at ESMSSP 7
EPOXI Light Curves
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May 18, 2010 Nick Cowan's Talk at ESMSSP 8
EPOXI Light Curves
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Cow
an e
t al
. (2
009)
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May 18, 2010 Nick Cowan's Talk at ESMSSP 9
Backward Modeling v.s. Forward Modeling
Data
Simple Model
Sophisticated Simulation
Assumptions
Parameters
Data Starved
Data Rich
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May 18, 2010 Nick Cowan's Talk at ESMSSP 10
Forward (Predictive) Modeling
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March 19th, 2008(Robinson et al. 2010)
Data
Model
time
RMSE = 1.9%
RMSE = 1.6%RMSE = 2.0%
RMSE = 2.3%
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March 19th, 2008
time
RMSE = 1.9% RMSE = 2.3%
RMSE = 2.0% RMSE = 1.6%
Data
Model
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June 5th, 2008(Robinson et al. 2010)
time
RMSE = 3.7%
RMSE = 3.7%
RMSE = 2.8% RMSE = 3.5%Data
Model
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June 5th, 2008
time
RMSE = 2.8% RMSE = 3.5%
RMSE = 3.7%
RMSE = 3.7%
Data
Model
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May 18, 2010 Nick Cowan's Talk at ESMSSP 15
Backward (Interpretive) Modeling
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May 18, 2010 Nick Cowan's Talk at ESMSSP 16
Time-Averaged Spectrum
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Cow
an e
t al
. (2
009)1) Clouds are plentiful and bright
2) Can we learn about planetary surface despite them?
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May 18, 2010 Nick Cowan's Talk at ESMSSP 17
Principal Component Analysis
Fa
Fb
C1
C2
<C>
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May 18, 2010 Nick Cowan's Talk at ESMSSP 18
Eigencolors
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Cow
an e
t al
. (2
009)
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May 18, 2010 Nick Cowan's Talk at ESMSSP 19
Earth from Above
Cow
an e
t al
. (in
pre
p)
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May 18, 2010 Nick Cowan's Talk at ESMSSP 20
Northern Eigencolors
Cow
an e
t al
. (in
pre
p)
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May 18, 2010 Nick Cowan's Talk at ESMSSP 21
Earth from Below
Cow
an e
t al
. (in
pre
p)
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May 18, 2010 Nick Cowan's Talk at ESMSSP 22
Southern Eigencolors
Cow
an e
t al
. (in
pre
p)
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May 18, 2010 Nick Cowan's Talk at ESMSSP 23
Reflected Light
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Diffuse (Lambert) Reflection
Specular (Shiny) Reflection
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May 18, 2010 Nick Cowan's Talk at ESMSSP 24
Specular Reflection (it’s small)
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Williams & Gaidos (2008)
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May 18, 2010 Nick Cowan's Talk at ESMSSP 25
Equatorial Map
Cow
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009)
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May 18, 2010 Nick Cowan's Talk at ESMSSP 26
A Different Kind of Map
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1) Simulated white light curve of Earth with real cloud cover
2) Can’t recover major landforms
Oakley & Cash (2009)
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May 18, 2010 Nick Cowan's Talk at ESMSSP 27
Conclusion
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Fro
m V
PL
Time-Resolved, Multi-Band PhotometryComplements Time-Averaged Spectroscopy