ASTRON 2B03 Lecture Notes - Lecture 3: Orbital Period, Strong Gravity, Binary Star

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Easiest to study, parent tends to be brighter causing a stronger signal. Planet around the alpha centauri (closest star, brightest in. Centaurus constellation) o binary star (pair of stars orbiting), planet orbits brighter of the two, outside hz. Starspots complicate the analysis, need data to determine if. 11th system kepler looked at and con rmed there are planets around it. 6 planets orbiting in a tightly packed orbital system o all orbits smaller orbit than venus" orbit lowest mass con rmed exoplanet. Distributing prohibited | downloaded by arsen terzian ([email protected] com) lomoar cpsd| 2151316. Kepler 138b: 1. 0 +/- 0. 3 m earth (but lower density, therefore may not be rocky planet) Gliese 581 d (has at least 3 planets around it) 20 light years away, 7. 8 times more massive than the earth. Orbit radius is 25% of earth (orbital period of 83 days) Every object has a critical size below which it becomes a black hole.

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