Story perspectives

New Companion Discovered Orbiting Red Giant ?1 Gruis

11/16/2025

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Summary

Story summary

Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) found a hidden companion orbiting the red giant ?1 Gruis, about 530 light-years away.
The companion follows a nearly circular orbit.
The circular path challenges prior elliptical models and implies more efficient tidal interactions.
The study, led by Mats Esseldeurs, was published in Nature Astronomy and underscores understanding companion behavior to predict stellar and planetary evolution.

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Story summary

Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) found a hidden companion orbiting the red giant ?1 Gruis, about 530 light-years away.
The companion follows a nearly circular orbit.
The circular path challenges prior elliptical models and implies more efficient tidal interactions.
The study, led by Mats Esseldeurs, was published in Nature Astronomy and underscores understanding companion behavior to predict stellar and planetary evolution.