What question did this study set out to answer?

This research aims to identify hypervelocity stars that have been ejected from the Galactic centre.

April 29, 2026

Discovery of Galactic-centre-ejected star in DESI DR1

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Randomized trial identifies a hypervelocity star from the Galactic centre, indicating its origin in the Milky Way's innermost regions.

This research aims to identify hypervelocity stars that have been ejected from the Galactic centre.
Conducted a six-dimensional search using spectroscopy from DESI and astrometry data.
Identified a candidate star with a trajectory traceable back to the central 2pc of the Galaxy.
Analyzed the star's metallicity and inferred ejection velocity.
Identified a candidate star with a GC ejection velocity of 698^ +35 -27 consistent with the Hills mechanism.
The star has an inferred metallicity of 0.27± 0.09, indicating it originates near the Galactic centre.
Compared to other HVSs, this star is a ∼1,M_⊙ main sequence or early sub-giant branch star, offering a unique opportunity for chemical analysis.

Cavieres et al. (2026) studied this question.

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