Planet detection using radial velocity

Référence de la vidéo 11926760
Extrasolar planet detection using the radial velocity method. This is one of the main ways that astronomers can find planets around distant stars. It relies on the Doppler effect altering the light from the star in a regular way. In this diagram, the orbit of the planet is shown as a dotted line. The planet and the star orbit their common centre of mass, meaning the star varies in position, shown by the inner dotted circle. The effect has been greatly exaggerated here. At the bottom is the spectrum of light from the star. When the star is moving towards Earth, the Doppler effect shifts the spectrum towards the blue end, and when it is moving away it is redshifted. Studying the period of this cycle reveals the period of the planet's orbit, and also its mass.<br>Restrictions:
Licence : Droits gérés
Crédit : Science Photo Library / L CALCADA / EUROPEAN SOUTHERN OBSERVATORY
Model Release : Le droit n'est pas encore disponible. Merci de nous contacter avant utilisation.
Property release : Non requis
Durée : 20 Secondes
Aspect ratio : 16/9
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  • This clip may not be used by or to promote the arms, nuclear power or tobacco industries or any religious organisation, or in any discriminatory way, or to imply the endorsement by ESO of any product, service or activity

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