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

Čotar, Klemen; Zwitter, Tomaž; Traven, Gregor; Kos, Janez; Asplund, Martin; Bland-Hawthorn, Joss; Buder, Sven; D'Orazi, Valentina; de Silva, Gayandhi M.; Lin, Jane; Martell, Sarah L.; Sharma, Sanjib; Simpson, Jeffrey D.; Zucker, Daniel B.; Horner, Jonathan; Lewis, Geraint F.; Nordlander, Thomas; Ting, Yuan-Sen; Wittenmyer, Rob A.; Collaboration, Galah

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

MPS-Authors

Čotar, Klemen
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zwitter, Tomaž
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Traven, Gregor
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kos, Janez
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Asplund, Martin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bland-Hawthorn, Joss
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Buder, Sven
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

D'Orazi, Valentina
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

de Silva, Gayandhi M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lin, Jane
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martell, Sarah L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sharma, Sanjib
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Simpson, Jeffrey D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zucker, Daniel B.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Horner, Jonathan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lewis, Geraint F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nordlander, Thomas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ting, Yuan-Sen
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wittenmyer, Rob A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collaboration, Galah
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019MNRAS.487.2474C
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Citation

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.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D172-E

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.