eccentric planets
eccentric planets
eccentric planets
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N. Santos et al. (2005)<br />
Metallicity effect for giant <strong>planets</strong><br />
search sample (all stars)<br />
stars with giant <strong>planets</strong><br />
•the detection probability for giant <strong>planets</strong> is a strongly increasing function of the host star<br />
metallicity.<br />
•No hot Jupiters found in globular cluster 47 Tuc ([Fe/H]=-0.76). Expected for solar neighborhood<br />
frequency (~0.5%): seven discoveries.<br />
•Best known star-planet correlation for exo<strong>planets</strong>. Important constraint for formation.<br />
•Explanation:<br />
• <strong>planets</strong> form more readily in metal rich systems (primordial hypothesis). Likely.<br />
• falling in <strong>planets</strong> have enriched the star (pollution hypothesis)
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