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Retrievals of Dayside Emission Spectra: Trends in Chemistry. Michael Line, Aaron Wolf, Xi Zhang, Yuk Yung Caltech. Ions. Photochemistry. Vertically Mixed. CO . CH 4 quenched. CH 4. CO quenched. Thermo. Eq. H 2 O + CH 4 = CO + 3H 2. Synthetic Study. Spitzer Broadband+IRS+NICMOS.

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retrievals of dayside emission spectra trends in chemistry

Retrievals of Dayside Emission Spectra: Trends in Chemistry

Michael Line, Aaron Wolf, Xi Zhang,

Yuk Yung

Caltech

slide2

Ions

Photochemistry

Vertically Mixed

CO

CH4 quenched

CH4

CO quenched

Thermo. Eq.

synthetic study
Synthetic Study

Spitzer Broadband+IRS+NICMOS

Spitzer Broadband

FINESSE

S/N~3.5

Δλ=0.0075 μm

slide5

MCMC

Optimal Est.

slide6

GJ436

Line et al. 2011

HD189733

Moses et al. 2011

WASP12

Kopparapu et al. 2012

slide7

GJ436

Line et al. 2011

HD189733

Moses et al. 2011

TRES2

WASP12

Kopparapu et al. 2012

HD189733

WASP19

WASP12

HD149026

GJ436

slide8

MCMC

OPT. EST.

Dis-eq. Models

GJ436

Line et al. 2011

HD189733

Moses et al. 2011

TRES2

WASP12

Kopparapu et al. 2012

HD189733

WASP19

WASP12

HD149026

GJ436

conclusions
Conclusions
  • Opt est and MCMC agree for “quality” data
  • Most planets seem out of equilibrium (to within “1-sigma”)
  • Errors large on current gas estimations
  • Need dedicated space based spectroscopic instrument
  • Can maybe constrain Kzz
goals
Goals
  • Look at the ensemble of planetary atmospheres. Indentify trends in composition—equilibrium vs. disequilibrium
  • First must robustly determine temperatures and compositions of exoplanet atmosphere
two bayesian retrieval approaches
Two Bayesian Retrieval Approaches

Optimal Estimation

(Lee et al. 2011 , Line et al. 2012)

Markov Chain Monte Carlo

(Madhusudhan et al. 2011 , Benneke & Seager 2012)

That Parameter

That Parameter

This Parameter

  • Levenberg-Marquardt to find best solution
  • Assumes Gaussian posterior
  • - Fast—not slowed down by additional parameters or more sophisticated forward models
  • Randomly explore’s all of parameter space
  • - Accounts for non-Gaussian posteriors
  • - Slow—many parameters and more sophisticated forward models unwieldy

This Parameter

Forward Model: [T, fH2O, fCH4, fCO ,fCO2]

Guillot 2010 [γv1, γv2, κIR, α, β]

synthetic study1
Synthetic Study

Spitzer Broadband+IRS+NICMOS

Spitzer Broadband

FINESSE

MCMC

Opt. Est.

True

synthetic study2
Synthetic Study

Spitzer Broadband+IRS+NICMOS

Spitzer Broadband

FINESSE