Burning lithium inside a star (artist's impression)

Artist’s impression of a baby star still surrounded by a protoplanetary disc in which planets are forming. Using ESO’s very successful HARPS spectrograph, a team of astronomers has found that Sun-like stars which host planets have destroyed their lithium much more efficiently than planet-free stars. This finding does not only shed light on the low levels of this chemical element in the Sun, solving a long-standing mystery, but also provides astronomers with a very efficient way to pick out the stars most likely to host planets. It is not clear what causes the lithium to be destroyed. The general idea is that the planets or the presence of the protoplanetary disc disturb the interior of the star, bringing the lithium deeper down into the star than usual, into regions where the temperature is so hot that it is destroyed.

Crédit:

ESO/L. Calçada

À propos de l'image

Identification:eso0942a
Type:Dessin
Date de publication:11 novembre 2009
Communiqués de presse en rapport:eso0942
Annonces en rapport:ann1046
Taille:3000 x 2000 px

À propos de l'objet

Nom:Protoplanetary disc
Type:Unspecified : Star : Circumstellar Material : Disk : Protoplanetary
Catégorie:Illustrations

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