Robert Lea is a science journalist in the U.K. whose articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space, Newsweek and ZME Science. He also writes about science communication for Elsevier and the European Journal of Physics. Rob holds a bachelor of science degree in physics and astronomy from the U.K.
Scientists have directly imaged eight dim objects accompanying very bright stars within the Gaia data catalog, including so-called"failed stars," otherwise known as brown dwarfs. on the peak of Cerro Paranal in Chile.
"We have demonstrated that it is possible to capture an image of a faint companion, even when it orbits very close to its bright host," team leader and European Southern Observatory scientist Thomas Winterhalder."This achievement highlights the remarkable synergy between Gaia and GRAVITY. Only Gaia can identify such tight systems hosting a star and a 'hidden' companion, and then GRAVITY can take over to image the smaller and fainter object with unprecedented accuracy.
This redshift and blueshift effect is analogous to the Doppler shift, the phenomenon that affects soundwaves on Earth. For instance, as an ambulance races toward you with its siren blaring, the soundwaves are compressed, and the siren is higher pitched, akin to blueshift. As the ambulance passes you, the wavelengths of sound stretch out, and the siren is low-pitched, just like the redshift of the light from the star as it moves away.
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