AST101H1 Chapter Notes - Chapter 13: Exoplanet, Jupiter Mass, Orbital Eccentricity
27 Dec 2013
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AST101H1 Full Course Notes
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Brown dwarves: objects with masses greater than 13 times jupiters mass and. 0. 08 times the suns mass, are like large jovian planets but tiny stars. A sun like star would be a billion times as bright as the light reflected from any planets and telescopes blur light. Directly: pictures or spectra of the planets themselves constitute direct evidence of their existence. Indirectly: precise measurements of stellar properties (such as position, brightness, or spectra), may indirectly reveal the effects of orbiting planets. Nearly all extrasolar planets have been discovered by indirect techniques. Detected by indirectly observing tugs they exert on the stars they orbit (we observe stars without actually seeing the planets themselves- why indirect) All objects in star system, including sun, orbit the systems balance point or center of mass. Jupiters tug on the sun is greater than the rest of the planets combined.
