Barnards Stern hat vier kleine Planeten, die jeweils etwa zwei- bis dreimal so hoch wie die Masse des Mars
Barnards Stern hat vier kleine Planeten, die jeweils etwa zwei- bis dreimal so hoch wie die Masse des Mars
1 Kommentar
>The nearest single star to the sun, Barnard’s star, has a brood of planets all its own. The red dwarf star, about six light-years from Earth, hosts [four close-in planets](https://iopscience.iop.org/article/10.3847/2041-8213/adb8d5) each about two to three times the mass of Mars, astronomers report in the March 20 *Astrophysical Journal Letters*.
>“Barnard’s star has a long history of claimed detections, but none of them could be confirmed for a long time,” says astronomer Ritvik Basant of the University of Chicago. “It’s pretty exciting to know what’s orbiting the nearest stars.”
>From 2021 to 2023, Basant and his colleagues observed Barnard’s star 112 times using the [MAROON-X](https://www.gemini.edu/instrumentation/maroon-x) spectrograph on the Gemini North telescope in Hawaii. “I was starting to see these signals in the dataset,” Basant says. But because he was still calibrating the instrument, “we ignored it for that time.”
>Then last October, a team using the ESPRESSO spectrograph on a telescope in Chile reported evidence of [one planet orbiting Barnard’s star](https://www.sciencenews.org/article/barnards-star-exoplanet-in-orbit), dubbed simply b, and hints of three others — designated c, d and e. With these hints in mind, Basant and colleagues reexamined their data, confirming three of the planets.
Read [more here](https://www.sciencenews.org/article/barnards-star-four-small-planets) and the [research article here](https://iopscience.iop.org/article/10.3847/2041-8213/adb8d5).