4.28 Astro 1 Section 1 Professor Brandt

4.28 Astro 1 Section 1 Professor Brandt - Astro 1 Section 1...

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Astro 1 Section 1 Professor Brandt Wednesday April 28th 1999 Announcements: Lecture notes: Other Planets Last time we talked about the formation of the planets in a protoplanetary disk around the Sun. These disks seem to be common for young stars suggesting that planets should be fairly common about stars. In fact this appears to be the case based on recent discoveries since 1995. We now know of at least 20 planets orbiting Sun-like stars and more are being found all the time. We'll briefly discuss these today but only in basic details. The first planets outside the solar system were found by PSU's Wolszczan around PSR 1957+12. Has 3 planets 4.3 3.6 0.019 Earth masses at 0.19-.47 AU. So for planets around Sun-like stars how do we discover them? First of all we can't at present make direct images to see these planets. Planets don't shine with their own light (at least in the optical band) and only have reflected light. Expected to be greater than 1 million times fainter than their host
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This note was uploaded on 02/20/2008 for the course ASTRO 1 taught by Professor Brandt during the Spring '99 term at Pennsylvania State University, University Park.

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4.28 Astro 1 Section 1 Professor Brandt - Astro 1 Section 1...

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