1. We analyze the amount of lithium that has a star.
2. If you are around 1% means it is very likely to have around a planet (the stars without planets have up to 10%).
The explanation for this is that the existence of a planet is a gravitational field ... a gravitational field that varies as the orbit the planet is not constant, this variation causes changes in the field of "rolling" in the star that leads to a better mix of components. Since the lithium alone needs 2.5 million degrees to destroy, this mixture causes a drop in its concentration in relation to what would happen to a star without planets.
All this holds for stars such as ours, the lesser stars have no place to shelter the Lithium, and stars much larger site and also "pass" the gravitational field of the planets, on the other hand, could have planets far from the star and did not influence their internal motions.
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