Lecture 22 - Search for Extraterrestrial Life and SETI - December 3.docx

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University of Toronto St. George
Astronomy & Astrophysics
Michael Reid

December 3, 2013. Lecture 22 - The Search for Extraterrestrial Life and SETI • Both methods for finding exoplanets have significant biases o Radial velocity/wobble/Doppler method  Star orbiting around centre of mass; Doppler shift in absorption spectrum  Easier to detect solar systems that have massive planets orbiting closer to their sun; more wobble  We can use the magnitude of the Doppler shift to estimate the mass of the unseen planet  Most radial velocity planets are “hot Jupiters” • Some of these planets will get so close to the star that they begin to evaporate • Bring their moons with them when they migrate towards the sun; could be life on those moons • Abundance of hot Jupiters is an observational bias o Transit Method  Measuring dips in light from planets passing in front of and behind a star  Nearly edge-on orbit • We see a transitAND a Doppler shift  Face-on orbit • We see no transit and no Doppler shift o Direct Imaging  Taking a picture  Terrestrial Planet Finder interferometer concept • Can take detailed images of
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