KIC 7177553

A QUADRUPLE SYSTEM of TWO CLOSE BINARIES

H. Lehmann, T. Borkovits, S. A. Rappaport, H. Ngo, D. Mawet, Sz Csizmadia, E. Forgács-Dajka

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

KIC 7177553 was observed by the Kepler satellite to be an eclipsing eccentric binary star system with an 18-day orbital period. Recently, an eclipse timing study of the Kepler binaries has revealed eclipse timing variations (ETVs) in this object with an amplitude of ∼100 s and an outer period of 529 days. The implied mass of the third body is that of a super-Jupiter, but below the mass of a brown dwarf. We therefore embarked on a radial velocity (RV) study of this binary to determine its system configuration and to check the hypothesis that it hosts a giant planet. From the RV measurements, it became immediately obvious that the same Kepler target contains another eccentric binary, this one with a 16.5-day orbital period. Direct imaging using adaptive optics reveals that the two binaries are separated by 0.″4 (∼167 AU) and have nearly the same magnitude (to within 2%). The close angular proximity of the two binaries and very similar γ velocities strongly suggest that KIC 7177553 is one of the rare SB4 systems consisting of two eccentric binaries where at least one system is eclipsing. Both systems consist of slowly rotating, nonevolved, solar-like stars of comparable masses. From the orbital separation and the small difference in γ velocity, we infer that the period of the outer orbit most likely lies in the range of 1000-3000 yr. New images taken over the next few years, as well as the high-precision astrometry of the Gaia satellite mission, will allow us to set much narrower constraints on the system geometry. Finally, we note that the observed ETVs in the Kepler data cannot be produced by the second binary. Further spectroscopic observations on a longer timescale will be required to prove the existence of the massive planet.

Original languageEnglish
Article number33
JournalAstrophysical Journal
Volume819
Issue number1
DOIs
Publication statusPublished - Mar 1 2016

Fingerprint

eccentrics
eclipses
time measurement
orbitals
radial velocity
planets
astrometry
planet
binary stars
Jupiter (planet)
adaptive optics
velocity measurement
proximity
satellite mission
Jupiter
orbits
stars
geometry
configurations
timescale

Keywords

  • binaries: eclipsing
  • binaries: spectroscopic
  • planetary systems
  • stars: fundamental parameters

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Lehmann, H., Borkovits, T., Rappaport, S. A., Ngo, H., Mawet, D., Csizmadia, S., & Forgács-Dajka, E. (2016). KIC 7177553: A QUADRUPLE SYSTEM of TWO CLOSE BINARIES. Astrophysical Journal, 819(1), [33]. https://doi.org/10.3847/0004-637X/819/1/33

KIC 7177553 : A QUADRUPLE SYSTEM of TWO CLOSE BINARIES. / Lehmann, H.; Borkovits, T.; Rappaport, S. A.; Ngo, H.; Mawet, D.; Csizmadia, Sz; Forgács-Dajka, E.

In: Astrophysical Journal, Vol. 819, No. 1, 33, 01.03.2016.

Research output: Contribution to journalArticle

Lehmann, H, Borkovits, T, Rappaport, SA, Ngo, H, Mawet, D, Csizmadia, S & Forgács-Dajka, E 2016, 'KIC 7177553: A QUADRUPLE SYSTEM of TWO CLOSE BINARIES', Astrophysical Journal, vol. 819, no. 1, 33. https://doi.org/10.3847/0004-637X/819/1/33
Lehmann H, Borkovits T, Rappaport SA, Ngo H, Mawet D, Csizmadia S et al. KIC 7177553: A QUADRUPLE SYSTEM of TWO CLOSE BINARIES. Astrophysical Journal. 2016 Mar 1;819(1). 33. https://doi.org/10.3847/0004-637X/819/1/33
Lehmann, H. ; Borkovits, T. ; Rappaport, S. A. ; Ngo, H. ; Mawet, D. ; Csizmadia, Sz ; Forgács-Dajka, E. / KIC 7177553 : A QUADRUPLE SYSTEM of TWO CLOSE BINARIES. In: Astrophysical Journal. 2016 ; Vol. 819, No. 1.
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