New Era of Exoplanet Discovery Begins with Images of ‘Jupiter’s Younger Sibling’

June 22, 2023 • by Marc Airhart

Astrometry uses the shift in a star’s position on the sky relative to other stars to infer the existence of orbiting planets.

In this side-by-side comparison of two telescope images, a white dot on a blue background changes position as it orbits around a central star symbol

The movement of the extrasolar planet AF Lep b (white spot at about 10 o’clock) around its host star (center) can be seen in these two images taken in Dec. 2021 and Feb. 2023. Images were collected using the W.M. Keck Observatory’s 10-meter telescope in Hawaii. Image credit: Kyle Franson/University of Texas at Austin.


Two telescope domes silhouetted by sunlight creeping over the horizon beneath a blue and purple sky

W.M. Keck Observatory. Photo credit: Ethan Tweedie.

Chart showing masses and distances for all directly imaged extrasolar planets

This chart shows the masses and orbital distances of all of the extrasolar planets that have been directly imaged so far. Astronomers have confirmed the masses of five (marked with stars) and estimated the rest (dots). The newly imaged planet, AF Lep b (yellow star), has a mass and orbit that make it one of the most Jupiter-like extrasolar planets imaged so far. Illustration credit: Brendan Bowler/University of Texas at Austin.

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