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  The GALAH survey: unresolved triple Sun-like stars discovered by the Gaia mission

Čotar, K., Zwitter, T., Traven, G., Kos, J., Asplund, M., Bland-Hawthorn, J., et al. (2019). The GALAH survey: unresolved triple Sun-like stars discovered by the Gaia mission. Monthly Notices of the Royal Astronomical Society, 487, 2474-2490.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D172-E Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D173-D
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2019MNRAS.487.2474C (Any fulltext)
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 Creators:
Čotar, Klemen1, Author
Zwitter, Tomaž1, Author
Traven, Gregor1, Author
Kos, Janez1, Author
Asplund, Martin1, Author
Bland-Hawthorn, Joss1, Author
Buder, Sven1, Author
D'Orazi, Valentina1, Author
de Silva, Gayandhi M.1, Author
Lin, Jane1, Author
Martell, Sarah L.1, Author
Sharma, Sanjib1, Author
Simpson, Jeffrey D.1, Author
Zucker, Daniel B.1, Author
Horner, Jonathan1, Author
Lewis, Geraint F.1, Author
Nordlander, Thomas1, Author
Ting, Yuan-Sen1, Author
Wittenmyer, Rob A.1, Author
Collaboration, Galah1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: methods: data analysis binaries: general stars: solar-type Galaxy: stellar content Astrophysics - Solar and Stellar Astrophysics Astrophysics - Astrophysics of Galaxies
 Abstract: The latest Gaia data release enables us to accurately identify stars that are more luminous than would be expected on the basis of their spectral type and distance. During an investigation of the 329 best solar twin candidates uncovered among the spectra acquired by the GALAH survey, we identified 64 such overluminous stars. In order to investigate their exact composition, we developed a data-driven methodology that can generate a synthetic photometric signature and spectrum of a single star. By combining multiple such synthetic stars into an unresolved binary or triple system and comparing the results to the actual photometric and spectroscopic observations, we uncovered 6 definitive triple stellar system candidates and an additional 14 potential candidates whose combined spectrum mimics the solar spectrum. Considering the volume correction factor for a magnitude-limited survey, the fraction of probable unresolved triple stars with long orbital periods is ̃2 per cent. Possible orbital configurations of the candidates were investigated using the selection and observational limits. To validate the discovered multiplicity fraction, the same procedure was used to evaluate the multiplicity fraction of other stellar types.

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 Dates: 2019
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 487 Sequence Number: - Start / End Page: 2474 - 2490 Identifier: -