They observed it for five years (from 2016 to 2020) with CARMENES (or Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle spectrographs, so you can see why they go with the acronym). This is a project to observe nearby red dwarfs (called M-type stars by astronomers) and look for Earth-sized planets orbiting them.
Two objects of different masses orbit each other; the more massive one makes a little circle and the lower mass one a bigger circle. Credit: NASA/Spaceplace
Astronomers found that the star underwent a shift with a 1.467-day period, indicating a planet in a close orbit. They found the planet has a mass of 2.8 times that of Earth, and orbits just 2.6 million kilometers from it. That’s