The Direct Study of Exoplanet Atmospheres
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1 The Direct Study of Exoplanet Atmospheres David Charbonneau (Harvard-Smithsonian Center for Astrophysics) Symposium in Honor of Giovanni Fazio 27 May 2008
2 Statement about the Astronomy & Astrophysics Decadal Survey
3 Astronomers have developed two clever (but indirect) methods to find exoplanets Doppler Method Determine Planet Mass Transit Method Determine Planet Diameter Calculate Planet Density and Infer Composition: Gas giant (Jupiter), Ice giant (Neptune), or Rocky planet (Earth)
4 Why All the Fuss About Transiting Exoplanets? They permit direct estimates of the masses and radii. They permit studies of the exoplanetary atmospheres. They will enable the first studies of the spectra of potentially habitable worlds beyond the Solar system.
5 Masses and Sizes
6 Masses and Sizes Present Day
7 Masses and Sizes Present Day
8 Masses and Sizes Present Day
9 Welcome to the Era of Comparative Exoplanetology Images courtesy of G. Laughlin. Figures courtesy G. Laughlin
10 Transits Allows Studies of the Atmospheres That Are Not Possible for Non-Transiting Planets Secondary Eclipse See thermal radiation and reflected light from planet disappear and reappear Transit See radiation from star transmitted through the planet s atmosphere
11 Transits Allows Studies of the Atmospheres That Are Not Possible for Non-Transiting Planets Transit See radiation from star transmitted through the planet s atmosphere
12 Transits Allows Studies of the Atmospheres That Are Not Possible for Non-Transiting Planets Transit See radiation from star transmitted through the planet s atmosphere
13 Prior to launch
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15
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17 Transits Allows Studies of the Atmospheres That Are Not Possible for Non-Transiting Planets Secondary Eclipse See thermal radiation and reflected light from planet disappear and reappear Detection of: Transit See radiation from star transmitted through the planet s atmosphere -Water -Methane -Carbon Monoxide -Clouds
18 Discovery of Bright Transiting Systems + Amazing Stability of Spitzer Space Telescope = Direct Study of Exoplanet Emission 8 BRIGHT systems + 35 moderately bright systems Cold or Warm: Preeminent for Studies of Exoplanets Image credit: G. Laughlin
19 Spitzer Photometry of an Exoplanet Passing Behind Its Star Charbonneau, Knutson et al. 2008
20 These Observations Permit Us to Study the Temperature and Chemistry of Exoplanet Atmospheres Model Data Charbonneau, Knutson et al. (2008)
21 Mapping the Surface Emission of an Exoplanet Knutson, Charbonneau, et al. Nature (2007) Modest day/night temperature difference indicates efficient heat redistribution. Hottest point on planet lies east of high noon, indicating winds.
22 How can we use these techniques to study the atmosphere of a habitable exoplanet?
23 What Are the Prospects for Finding Transi5ng Terrestrial Planets? This is what we ve observed so far This is what we would like to observe Jupiter s area is 120 times greater than the Earth s, and it has over 300 times the Earth s mass.
24
25 Kepler Mission Successful Launch March 6th, 2009
26 Kepler First Light Images!!!
27 Many Kepler-detected worlds will be studied by Warm Spitzer / IRAC
28 The Small Star Opportunity
29 The Small Star Opportunity Consider rocky planet in the habitable zone of a lowmass star (known as an M-star): Transits are deeper Sun: 0.03% M-star: 0.5% Transits are more frequent Sun: 365 days M-star: 15 days Transits are more likely Sun: 0.5% M-star: 1.6%
30 The MEarth Project with P. Nutzman, J. Irwin, C. Burke, Z. Berta, and E. Falco Charbonneau, Irwin, Nutzman, Falco and others! Nutzman & Charbonneau 2008; Irwin et al. 2008
31 MEarth Project, Whipple Observatory, AZ
32 Transit Studies of the Atmospheres Are Facilitated by the Small Size of the Star Secondary Eclipse See thermal radiation and reflected light from planet disappear and reappear MEarth System Transit See radiation from star transmitted through the planet s atmosphere Earth-Sun System.
33 Habitable-Zone Planets Orbiting Low-Mass Stars are Ideal Targets for Atmospheric Studies to Search for BIOMARKERS James Webb Space Telescope is scheduled for launch in 2013.
34 : Hydrogen + Helium Worlds Transit Detection Atmospheric Characterization
35 : Hydrogen + Helium Worlds Transit Detection Atmospheric Characterization Near Future: Rock + Ice Worlds Transit Detection Atmospheric Characterization
36 MEarth Project Whipple Observatory, AZ Coming Soon: SuperEarths Transiting Small Stars
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