Netherlands Research School for Astronomy (NOVA) | 2017 Nov 09
A team of mainly Dutch astronomers has observed moving shadows on a dust disk around a star. On multiple days they took a 'photo' of the star and its disk. They used the SPHERE instrument, partially built in the Netherlands, on the Very Large Telescope in Chile. Probably, processes in the inner disk cast their shadows at the outer disk. ...
The discovery builds on an earlier publication in which the researchers made one image of the disk. By making multiple images, the astronomers clearly saw variations in the shadows. As a result, they could study the shadows in more detail.
The astronomers observed the shadows near the star HD135344B. That's a young star at a distance of about 450 light years of the earth. The dust disk around the star shows striking spiral arms. The researchers suspect that they are caused by one or more heavy protoplanets that will evolve into Jupiter-like worlds. ...
Variable Dynamics in the Inner Disk of HD 135344B Revealed
with Multi-Epoch Scattered Light Imaging - Tomas Stolker et al
- arXiv.org > astro-ph > arXiv:1710.02532 > 06 Oct 2017