New era of exoplanet discovery begins with images of 'Jupiter's younger sibling' AAS_Office
The planet, called AF Lep b, is among the first ever discovered using a technique called astrometry; this method measures the subtle movements of aover many years to help astronomers determine whether hard-to-see orbiting companions, including planets, are gravitationally tugging at it.
The direct images Franson's team captured revealed that AF Lep b is about three times the mass of Jupiter and orbits AF Leporis, a young sun-like star about 87.5 light-years away. They took a series of deep images of the planet starting in December 2021; two other teams also captured images of the same planet since then.
This chart shows the masses and orbital distances of all the extrasolar planets that have been directly imaged so far. Astronomers have confirmed the masses of five and estimated the rest . The newly imaged planet, AF Lep b , has a mass and orbit that make it one of the most Jupiter-like extrasolar planets imaged so far. Credit: Brendan Bowler, University of Texas at Austin
To directly image the planet, the UT Austin team used Keck Observatory's adaptive optics system, which corrects for fluctuations caused by turbulence in Earth's atmosphere, paired with the Keck II Telescope's Near-Infrared Camera 2 Vector Vortex Coronagraph, which suppresses light from the host star so the planet could be seen more clearly. AF Lep b is about 10,000 times fainter than its host star and is located about eight times the Earth-sun distance.
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