CU-Boulder ASTR 1020 - Lecture Notes (6 pages)

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Lecture Notes



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Lecture Notes

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Lecture Notes


Pages:
6
School:
University of Colorado at Boulder
Course:
Astr 1020 - Introductory Astronomy 2

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ASTR 1020 Stars Galaxies April 30 2008 The New Worlds Observer Looking for the Next Earth Using External Occulters Next class Review for Final Wrap up Final Exam May 5 4 30 7 00 pm Chapters 1 1 1 2 4 1 4 4 5 13 14 15 16 17 18 19 20 21 22 23 Phil Oakley University of Colorado April 30th 2008 1 Do there exist many worlds or is there but a single world This is one of the most noble and exalted questions in the study of Nature 2 Exoplanets The Planets That Circle Other Stars There are probably 10 000 within 10pc 30 light years of the Earth Indirect means have now found over 200 St Albertus Magnus 1206 1280 scholar and patron saint of scientists If we can observe them directly we will have a new field of astronomy every bit as rich as extragalactic 3 Detecting ExoPlanets Doppler Technique 4 First Extrasolar Planet Measuring a star s Doppler shift can tell us its motion toward and away from us Current techniques can measure motions as small as 1 m s walking speed Newton s version of Kepler s 3rd Law allows us to estimate mass Doppler shifts of star 51 Pegasi indirectly reveal a planet with 4 day orbital period Short period means small orbital distance First extrasolar planet discovered orbiting a regular star 1995 5 6 1 Clicker Question Clicker Question Suppose you found a star with the same mass as the Sun moving back and forth with a period of 16 months what could you conclude A B C D Suppose you found a star with the same mass as the Sun moving back and forth with a period of 16 months what could you conclude It has a planet orbiting at less than 1 AU It has a planet orbiting at greater than 1 AU It has a planet orbiting at exactly 1 AU It has a planet but we do not have enough information to know its orbital distance A B C D It has a planet orbiting at less than 1 AU It has a planet orbiting at greater than 1 AU It has a planet orbiting at exactly 1 AU It has a planet but we do not have enough information to know its orbital distance 7 8 Why Hasn t This Been Done



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