Hypervelocity star drags fastest exoplanet through space at 1.2 million mph

[Admin]

Astronomers have discovered what seems to be a star racing through the Milky Way at 1.2 million mph, dragging a Neptune-sized planet along for the ride.

Hypervelocity star drags fastest exoplanet through space at 1.2 million mph : Read more

 

[rod]

"In this case, the team detected a microlensing signal that indicated two cosmic objects. They determined one of these lensing bodies has a mass around 2,300 times greater than its companion, but weren't able to determine the exact masses of the objects because they were simply too far away."

313 exoplanets show confirmed by microlensing at this site, https://exoplanet.eu/home/

Masses range 0.0009000 mjup for OGLE-2016-BLG-1928 b up to 61 mjup for KMT-2021-BLG-1643 b

 

[JPL_ACE]

Why cant they use red shift to get a speed along the Earth : star direction?