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How to find a planet?
Geert Barentsen
August 01, 2017
Science
0
35
How to find a planet?
An introductory talk on NASA's Kepler and K2 missions, presented in August 2017.
Geert Barentsen
August 01, 2017
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Transcript
How to find a planet? (Not what the actual data
look like) @GeertHub www.geert.io github.com/barentsen Geert Barentsen
*
Are we alone?
None
Image: NASA
Detecting Planet Transits
Jupiter Earth Small planets are really hard to find
Jupiter Neptune 2 x Earth Earth Small planets are really
hard to find
* •need to look at the right place • at
the right time •and measure the brightness of stars • with extreme accuracy
NASA’s Kepler Mission “Are Earth-like planets common?”
* Kepler was launched on 6 March 2009 Attached to
a big telescope 100 megapixel camera (100 deg2) Makes movies of stars! The Kepler Spacecraft
* March 6, 2009
* The Kepler Field of View
• So what does the data look like?
None
Exoplanet Detections, 1989-1995 Radius Relative to Earth Orbital Period in
days Earth
Radius Relative to Earth Orbital Period in days Earth Jupiter
Exoplanet Detections, 1989-1995
Radius Relative to Earth Orbital Period in days Exoplanet Detections,
1995-2009
Radius Relative to Earth Orbital Period in days Earth Exoplanet
Detections, 1995-2013
Too big! Just right. Too small!
None
None
None
!24
2009-2013 Kepler observed 200,000 stars over 4 years, finding 4,496
candidate planets
And then it BROKE
Balancing Solar Pressure
None
None
Kepler now changes its pointing every 3 months ecliptic This
is called the K2 Mission
The Pleiades
Photometry of the Seven Sisters
33
None
!35
None
None
*
*
Are we alone?
None