exoplanets grade5 2015
TRANSCRIPT
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Exoplanets:Finding Other Worlds Around Other Stars
Paul GreenCenter for Astrophysics
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• What's the nearest star?
• Different kinds of stars• hot and cool• large and small• far and near
• Difference between a star and a planet?• Stars shine, planets don't• So why can we see planets?
• There are different kinds of planets too!
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Our Solar System
(Comparing Sizes)
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Terrestrial (Rocky) Planets
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Gas Giant Planets
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Planets’ Distances from the Sun
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How the Solar System FormedAbout 5,000,000,000 years ago
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Why do you think the rocky planetsare close to the Sun, and the gas giants far away?
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Exoplanets
Do you think there are planets around other stars?
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Finding Exoplanets
Like a mosquito near a far away headlight, planets around other stars are too faint to be seen.
So how can we find them?
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TIME
BRIGHT
NESS
00
Imagine you have a light sensor aimed a lamp.
What would the transit of a book look like if you made a graph of brightness vs time?
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Like this?
TIME00
BRIGHT
NESS
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What would the transit of a planet look like if you made a graph brightness vs
time?
TIME00
BRIGHT
NESS
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TIME00
This is a “light curve.”
How are the planet’s size and orbital period
shown in the light curve?
BRIGHT
NESS
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What’s This?
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NASA’s Kepler Mission
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A Kepler Planetary Transit Lightcurve
3.2 day period
5 hour eclipse
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Transiting Planets pre-Kepler
Orbital Period in days
Size
Rel
ative
to E
arth
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2222
Transiting Planets as of June 2010Data: May-Sep 2009
Orbital Period in days
Size
Rel
ative
to E
arth
Jun 2010
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Transiting Planets as of Feb 2011Q0-Q5: May 2009 - Jun 2010
Orbital Period in days
Size
Rel
ative
to E
arth
Jun 2010 Feb 2011
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24 Orbital Period in days
Size
Rel
ative
to E
arth
Transiting Planets as of Dec 2011Q0-Q6: May 2009 - Sep 2010
Jun 2010 Feb 2011 Dec 2011
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Different Types of Stars
Do blue stars always look fainter than red stars?
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What’s Next?• Kepler has discovered thousands of planets, now what?
• There are big surprises, like gas giants in close orbits,and enormous super-earths in large orbits.
• Time to search for signs of life!
• Giant telescopes are being built right now!
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Habitable Zone