Summary Thoughts - Scientific Wesley A. Traub Chief Scientist, NASA’s Exoplanet Exploration...
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Transcript of Summary Thoughts - Scientific Wesley A. Traub Chief Scientist, NASA’s Exoplanet Exploration...
![Page 1: Summary Thoughts - Scientific Wesley A. Traub Chief Scientist, NASA’s Exoplanet Exploration Program Jet Propulsion Laboratory, California Institute of.](https://reader036.fdocuments.net/reader036/viewer/2022082820/56649f555503460f94c79726/html5/thumbnails/1.jpg)
Summary Thoughts - Scientific
Wesley A. TraubChief Scientist, NASA’s Exoplanet Exploration Program
Jet Propulsion Laboratory, California Institute of Technology
Ozma 50 WorkshopGreen Bank, West Virginia
15 Sept. 2010
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SETI
Radio survey• 1-15 GHz, full spectrum, continuous observation• Sounds wise, not precluding any spectral region• “Expect the unexpected” philosophy
Optical survey• Visible or near-infrared• Could detect a beacon• Could have a radio signal in parallel, or be the signal itself
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SETU or SETSOL
Direct Imaging of Nearby Exoplanet Systems• Must be in space• Probably optical (possibly infrared)• Could happen in early 2020s• Would give images of planets (Earth-size and larger) and exozodi• Image from HZ to beyond Jupiter• Would give spectrum of each pixel• Detect H20, O2, O3, CO2, CH4, land plants, atmosphere, rotation, etc.
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Drake Equation Term ne
Preliminary derivation of ne from Kepler data• 42 days of data published so far• Select subset of exoplanets, complete in the 2-17 day period range• Select Jupiters in this complete sample• Compare to expected number in period & mass/radius range• Get excellent agreement; good sign!
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Exoplanet Mass-Radius
Kepl
er, B
oruc
ki e
t al 2
010
Cumming et al 2008
dN/dln(M) ~ M-0.31
Ref.: Seager, Kuchner, et al. 2007
“Jupiters”
“Earths”
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“Jupiters”
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“Jupiters”“Ice giants” “Earths & SuperEarths”
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ne
Preliminary derivation of ne from Kepler data• 42 days of data published so far• Select subset of exoplanets, complete in the 2-17 day period range• Select Jupiters in this complete sample• Compare to expected number in period & mass/radius range• Get excellent agreement; good sign!
• Fit ice-giant trend• Assume smallest radius bin is not complete• Extend trend to 1 Earth radius• Count expected number of 1-2 Earth-radius planets
• Extrapolate to HZ planets (Venus to Mars distances, 1-2 Earth radii)• Compare to sample size• Derive estimated ne, find a large number.