The European Southern Observatory’s Very Large Telescope has captured a remarkable series of images showing the exoplanet Beta Pictoris b orbiting its star, swinging from one side to the other. Discovered by the VLT in 2008, the same research team tracked the exoplanet over two years, from late 2014 to late 2016, using the Spectro-Polarimetric High-contrast Exoplanet REsearch instrument, or SPHERE, attached to the VLT.
Beta Pictoris b orbits its star at a distance of about 1.3 billion kilometres (808 million miles), roughly the distance from the Sun to Saturn, making it the most closely orbiting exoplanet ever directly imaged. The VLT-SPHERE images captured the planet as it appeared to approach its star then disappear into its glare before emerging as a separate object again on the other side. While the images give the appearance of a transit, the planet did not cross directly in front of its star as viewed from Earth.
In a release describing the observations, the ESO called the images “a remarkable achievement, heralding a new era in one of the most exciting and challenging areas of astronomy — discovering and characterising exoplanets.”