A new instrument designed to give scientists a direct look at nearby alien worlds has seen its "first light" in Chile, astronomers announced today (June 4).
Credit: ESO/J.-L. Beuzit et al./SPHERE Consortium
Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE), the new alien planet detection tool was mounted on the European Southern Observatory's Very Large Telescope Unit Telescope 3 in the Atacama Desert last month.
In its first few days of operations, SPHERE already has produced images of Saturn's moon Titan and dust discs around stars as it gears up to take pictures of exoplanets, ESO officials said.
Using space and ground-based telescopes, astronomers have detected more than 2,000 exoplanets since spotting the first ones back in the 1990s but scientists have rarely been able to look at these worlds directly because the weak glow of a planet is often outshined by bright light from its parent star.
Instead, astronomers often use indirect techniques like the transit method, in which they look for telltale dips in a star's brightness caused when a planet crosses in front of the star.
To be observed directly, planets usually need to be very large and very far away from their parent star.
The first confirmed direct photo of an alien planet in 2010 showed a world eight times the mass of Jupiter that orbited its host star at from more than 300 times the distance between Earth and the sun.
Credit: ESO/J. Girard
SPHERE is designed to get the highest contrast possible in a small patch of sky around a star to see exoplanets that might otherwise be hidden.
To boost the contrast in its images, SPHERE uses adaptive optics to correct for the blurring effects of the Earth's atmosphere as well as a coronagraph also blocks out starlight.
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