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

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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.

I: Monthly Notices of the Royal Astronomical Society, Vol. 487, Nr. 2, 2019, s. 2474-2490.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Harvard

Čotar, K, Zwitter, T, Traven, G, Kos, J, Asplund, M, Bland-Hawthorn, J, Buder, S, D'Orazi, V, De Silva, GM, Lin, J, Martell, SL, Sharma, S, Simpson, JD, Zucker, DB, Horner, J, Lewis, GF, Nordlander, T, Ting, YS & Wittenmyer, RA 2019, 'The GALAH survey: Unresolved triple Sun-like stars discovered by the Gaia mission', Monthly Notices of the Royal Astronomical Society, vol. 487, nr. 2, s. 2474-2490. https://doi.org/10.1093/mnras/stz1397

APA

Čotar, K., Zwitter, T., Traven, G., Kos, J., Asplund, M., Bland-Hawthorn, J., Buder, S., D'Orazi, V., De Silva, G. M., Lin, J., Martell, S. L., Sharma, S., Simpson, J. D., Zucker, D. B., Horner, J., Lewis, G. F., Nordlander, T., Ting, Y. S., & Wittenmyer, R. A. (2019). The GALAH survey: Unresolved triple Sun-like stars discovered by the Gaia mission. Monthly Notices of the Royal Astronomical Society, 487(2), 2474-2490. https://doi.org/10.1093/mnras/stz1397

CBE

Čotar K, Zwitter T, Traven G, Kos J, Asplund M, Bland-Hawthorn J, Buder S, D'Orazi V, De Silva GM, Lin J, Martell SL, Sharma S, Simpson JD, Zucker DB, Horner J, Lewis GF, Nordlander T, Ting YS, Wittenmyer RA. 2019. The GALAH survey: Unresolved triple Sun-like stars discovered by the Gaia mission. Monthly Notices of the Royal Astronomical Society. 487(2):2474-2490. https://doi.org/10.1093/mnras/stz1397

MLA

Vancouver

Author

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. / The GALAH survey : Unresolved triple Sun-like stars discovered by the Gaia mission. I: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 487, Nr. 2. s. 2474-2490.

RIS

TY - JOUR

T1 - The GALAH survey

T2 - Unresolved triple Sun-like stars discovered by the Gaia mission

AU - Čotar, Klemen

AU - Zwitter, Tomaž

AU - Traven, Gregor

AU - Kos, Janez

AU - Asplund, Martin

AU - Bland-Hawthorn, Joss

AU - Buder, Sven

AU - D'Orazi, Valentina

AU - De Silva, Gayandhi M.

AU - Lin, Jane

AU - Martell, Sarah L.

AU - Sharma, Sanjib

AU - Simpson, Jeffrey D.

AU - Zucker, Daniel B.

AU - Horner, Jonathan

AU - Lewis, Geraint F.

AU - Nordlander, Thomas

AU - Ting, Yuan Sen

AU - Wittenmyer, Rob A.

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

KW - Binaries: general

KW - Galaxy: stellar content

KW - Methods: data analysis

KW - Stars: solar-type

U2 - 10.1093/mnras/stz1397

DO - 10.1093/mnras/stz1397

M3 - Article

AN - SCOPUS:85071159376

VL - 487

SP - 2474

EP - 2490

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 1365-2966

IS - 2

ER -