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Lessons from the curious case of the ‘fastest’ star in Gaia DR2

Abstract:

Gaia DR2 5932173855446728064 was recently proposed to be unbound from the Milky Way based on the −614.3 ± 2.5 km s−1 median radial velocity given in Gaia DR2. We obtained eight epochs of spectroscopic follow-up and find a very different median radial velocity of −56.5 ± 5.3 km s−1. If this difference were to be explained by binarity, then the unseen companion would be an intermediate-mass black hole; we therefore argue that the Gaia DR2 radial velocity must be in error. We find it likely that...

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Publication status:
Published
Peer review status:
Peer reviewed
Version:
Publisher's version

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Publisher copy:
10.1093/mnras/stz253

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Institution:
University of Oxford
Division:
MPLS Division
Department:
Physics
Oxford college:
Magdalen College
Role:
Author
ORCID:
0000-0002-7521-6231
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Publisher:
Oxford University Press Publisher's website
Journal:
Monthly Notices of the Royal Astronomical Society Journal website
Volume:
486
Issue:
2
Pages:
2618–2630
Publication date:
2019-01-29
Acceptance date:
2019-01-22
DOI:
EISSN:
1365-2966
ISSN:
0035-8711
Pubs id:
pubs:974193
URN:
uri:0d036e39-ab97-477d-862c-d791beb0a070
UUID:
uuid:0d036e39-ab97-477d-862c-d791beb0a070
Local pid:
pubs:974193

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