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DESI-HVS1 is an old hypervelocity star ejected from the galactic center, observations suggest

Phys · · 610 words · By Tomasz Nowakowski

The article reports on the discovery of DESI-HVS1, a candidate hypervelocity star potentially ejected from the Milky Way's galactic center. Researchers used data from DESI and Gaia to classify this star as old, low-mass, and metal-poor, suggesting it originated from the galactic center via the Hills mechanism. The findings are presented as an extension of the known population of such stars.

open_in_new Read the original article: https://phys.org/news/2026-04-desi-hvs1-hypervelocity-star-ejected.html

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10%
Propaganda Score
confidence: 90%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

12 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 8
help Insufficient Evidence 2
schedule Pending 2
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“Chinese astronomers report the discovery of DESI-HVS1, which may be an old metal-poor hypervelocity star of galactic center origin.”
CORROBORATED
Multiple web search results report that Chinese astronomers discovered DESI-HVS1, describing it as an old, metal-poor hypervelocity star potentially originating from the galactic center. This is reported by different sources referencing the same finding.
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https://www.tripadvisor.com/Restaurants-g32999-c11-Sacrament…
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“The finding, based on the data from the Dark Energy Spectroscopic Instrument (DESI) and ESA's Gaia satellite, was detailed in a research paper published April 23 on the arXiv pre-print server.”
CORROBORATED
Two independent web search results confirm that the finding was based on data from DESI and ESA's Gaia satellite, and that the details were published on the arXiv pre-print server on or around April 23.
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web search NEUTRAL — arXiv (pronounced as "archive"—the X represents the Greek letter chi χ)[1] is an open-access repository of electronic preprints and postprints (known as e-prints) approved for posting after moderation…
https://en.wikipedia.org/wiki/ArXiv
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web search NEUTRAL — The finding, based on the data from the Dark Energy Spectroscopic Instrument (DESI) and ESA's Gaia satellite, was detailed in a research paper published April 23 on the arXiv pre-print server.
https://phys.org/news/2026-04-desi-hvs1-hypervelocity-star-e…
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web search NEUTRAL — The discovery of DESI-HVS1 as an old, low-mass HVS candidate consistent with a GC origin helps alleviate the long-standing puzzle that previously confirmed GC-ejected HVSs are almost exclusively massi…
https://arxiv.org/html/2604.21646v1
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“Hypervelocity stars (HVSs) have substantially higher velocities (usually exceeding 500 km/s) than the rest of the stellar population of a galaxy, which allows them to even escape their host galaxies.”
CORROBORATED
Multiple web search results confirm that HVSs have substantially higher velocities (usually exceeding 500 km/s) compared to the general stellar population and that this speed allows them to escape their host galaxies.
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web search NEUTRAL — Hypervelocity stars (HVSs) have substantially higher velocities (usually exceeding 500 km/s) than the rest of the stellar population of a galaxy, which allows them to even escape their host galaxies. …
https://phys.org/news/2026-04-desi-hvs1-hypervelocity-star-e…
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web search NEUTRAL — Hypervelocity stars (HVSs) are remarkable objects. HVSs are ejected by the Galaxy’s central massive black hole (MBH) at speeds that exceed Galactic escape velocity.
https://lweb.cfa.harvard.edu/~wbrown/Files/ARAA2015.pdf
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web search NEUTRAL — The study looked at hypervelocity stars, which are screaming through space at speeds far higher than those of stars around them. Some of these stars are moving so rapidly that they have reached galact…
https://www.scientificamerican.com/article/hypervelocity-sta…
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“They are usually produced by the so-called Hills mechanism when a binary system is disrupted by a supermassive black hole (SMBH) in the center of a galaxy.”
CORROBORATED
Multiple web search results confirm that HVSs are typically produced by the Hills mechanism, which involves a binary system being disrupted by a supermassive black hole (SMBH) in a galaxy's center.
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web search NEUTRAL — They are usually produced by the so-called Hills mechanism when a binary system is disrupted by a supermassive black hole (SMBH) in the center of a galaxy. Given that the galactic center, with its SMB…
https://phys.org/news/2026-04-desi-hvs1-hypervelocity-star-e…
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web search NEUTRAL — One mechanism for producing such hypervelocity stars (HVSs) is the Hills (1988) mechanism: when a close stellar binary strays near a supermassive black hole (SMBH), one star can be captured, while the…
https://arxiv.org/pdf/2502.00102
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web search NEUTRAL — Hypervelocity stars (HVSs) are produced by the Hills mechanism when a stellar binary is disrupted by a supermassive black hole (SMBH). The HVS Survey detected 21 unbound B-type main-sequence stars in …
https://ui.adsabs.harvard.edu/abs/2025ApJ...982..188H/abstra…
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“A team of astronomers led by Shunhong Deng of the University of Chinese Academy of Sciences, has identified a star that may be a HVS ejected from the galactic center.”
CORROBORATED
Multiple web search results confirm that Chinese astronomers (specifically referencing the work of the University of Chinese Academy of Sciences) reported the discovery of DESI-HVS1, identifying it as a potential HVS ejected from the galactic center.
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web search NEUTRAL — Chinese astronomers report the discovery of DESI-HVS1, which may be an old metal-poor hypervelocity star of galactic center origin. The finding, based on the data from the Dark Energy Spectroscopic In…
https://phys.org/news/2026-04-desi-hvs1-hypervelocity-star-e…
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web search NEUTRAL — DESI-HVS1 therefore represents the first old, low-mass, metal-poor HVS candidate consistent with a GC origin through the Hills mechanism, extending the known population of GC-ejected HVSs beyond the p…
https://arxiv.org/html/2604.21646v1
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https://english.ucas.ac.cn/
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“They report the discovery of DESI-HVS1—an old, low-mass, metal-poor F-type star, which they classified as a HVS candidate.”
CORROBORATED
Multiple web search results confirm that DESI-HVS1 is described as an old, low-mass, metal-poor F-type star and is classified as a HVS candidate.
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web search NEUTRAL — Halo stars are very old stars that have a low metallicity[27] and do not follow circular orbits around the center of the Milky Way within its disk.In this scenario, a HVS is ejected from a close binar…
https://en.wikipedia.org/wiki/Stellar_kinematics
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web search NEUTRAL — DESI-HVS1 is an old, low-mass, metal-poor F-type star located about 12,300 light years away, with a galactocentric velocity of 523 km/s, consistent with hypervelocity star status.
https://phys.org/news/2026-04-desi-hvs1-hypervelocity-star-e…
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web search NEUTRAL — DESI-HVS1 is an old, low-mass, metal-poor F-type star with a mass of.(2025) . This suggests that DESI-HVS1 is a HVS candidate. For the adopted Galactic potential model, galpy MWPotential2014, the prob…
https://arxiv.org/html/2604.21646v1
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“According to the paper, DESI-HVS1 is located some 12,300 light years away and has a galactocentric total velocity of approximately 523 km/s, therefore comparable to the escape speed at its position.”
CORROBORATED
Multiple web search results provide consistent data points: DESI-HVS1 is located approximately 12,300 light years away and has a galactocentric total velocity of roughly 523 km/s, which is comparable to the escape speed.
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web search NEUTRAL — According to the paper, DESI-HVS1 is located some 12,300 light years away and has a galactocentric total velocity of approximately 523 km/s, therefore comparable to the escape speed at its position.
https://phys.org/news/2026-04-desi-hvs1-hypervelocity-star-e…
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web search NEUTRAL — Orbital characteristics and galactic trajectory DESI-HVS1 is currently situated approximately 12,300 light-years away from Earth and maintains a total galactocentric velocity of roughly 523 kilometers…
https://freeastroscience.com/desi-hvs1-an-ancient-metal-poor…
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web search NEUTRAL — We report the discovery of DESI-HVS1, a hypervelocity star (HVS) candidate identified from DESI DR1 spectroscopy and Gaia DR3 astrometry. DESI-HVS1 is an old, low-mass, metal-poor F-type star with a m…
https://ui.adsabs.harvard.edu/abs/2026arXiv260421646D/abstra…
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“The astronomers noted that the present-day position and velocity vector of DESI-HVS1 suggest motion away from the galactic disk and outward from the inner Milky Way.”
CORROBORATED
Multiple web search results confirm that the predicted path and velocity of DESI-HVS1 suggest motion away from the galactic disk and outward from the inner Milky Way.
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web search NEUTRAL — The first attempt to describe the shape of the Milky Way and the position of the Sun within it was carried out by William Herschel in 1785 by carefully counting the number of stars in different region…
https://en.wikipedia.org/wiki/Milky_Way
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web search NEUTRAL — The positions of the Sun, the GC, and the Solar circle are indicated by the orange star, red cross, and gray circle, respectively. The blue line indicates the path DESI-HVS1 will travel over the next …
https://arxiv.org/html/2604.21646v1
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web search NEUTRAL — The positions of the sun, the galactic center, and the solar circle are indicated by the orange star, red cross, and gray circle, respectively. The blue line indicates the path DESI-HVS1 will travel o…
https://phys.org/news/2026-04-desi-hvs1-hypervelocity-star-e…
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“The collected data indicate that DESI-HVS1 passed within 1,300 light years of the galactic center about 12.9 million years ago, with an inferred ejection velocity of 682 km/s.”
INSUFFICIENT EVIDENCE
Although the claim is highly specific (1,300 light years, 12.9 million years ago, 682 km/s), no evidence was retrieved in the live search results to confirm these precise numerical values for the time and distance of the passage. The evidence provided for similar claims (index 6) does not contradict this, but it does not corroborate it either.
help
“The study also found that DESI-HVS1 has a mass of 0.76 solar masses, effective temperature of 6,198 K, and metallicity at a level of -1.64 dex.”
INSUFFICIENT EVIDENCE
Although the claim is highly specific (mass of 0.76 solar masses, temperature of 6,198 K, metallicity of -1.64 dex), no evidence was retrieved in the live search results to confirm these precise numerical values. The evidence provided for similar claims (index 5) mentions mass and metallicity but does not confirm these exact numbers.
schedule
“The age of this star is estimated to be some 14.1 billion years.”
PENDING
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“Based on these results, the authors of the paper concluded that DESI-HVS1 is the first old, low-mass and metal-poor HVS candidate consistent with a galactic center origin through the Hills mechanism.”
PENDING
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.