Eclipse timing variation analysis of OGLE-IV eclipsing binaries towards the Galactic Bulge – II. Short periodic triple stellar systems

Author:

Hajdu T123,Borkovits T24ORCID,Forgács-Dajka E1ORCID,Sztakovics J15,Bódi A23

Affiliation:

1. Eötvös Loránd University, Department of Astronomy, H-1118 Budapest, Pázmány Péter stny. 1/A, Hungary

2. Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Eötvös Loránd Research Network (ELKH), H-1121 Budapest, Konkoly Thege Miklós út 15-17, Hungary

3. MTA CSFK Lendület Near-Field Cosmology Research Group, Research Group, 1121, Budapest, Konkoly Thege Miklós út 15-17, Hungary

4. Baja Astronomical Observatory of Szeged University, H-6500 Baja, Szegedi út, Kt. 766, Hungary

5. Eszterházy Károly University, Department of Physics, H-3300 Eger, Eszterházy tér 1, Hungary

Abstract

ABSTRACT We report an eclipse timing variations (ETV) study to identify close, stellar mass companions to the eclipsing binaries monitored during the photometric survey Optical Gravitational Lensing Experiment-IV. We also present an alternative automatic way to determine the first and last contacts of an eclipse. Applying the phase dispersion minimization method to identify potential triples, we find close third components with outer periods in less than 1500 d in 23 systems. We present outer orbit solution for 21 of 23 systems. For the 10 tightest triples, we find that the ETV can only be modelled with the combination of the light-travel-time effect (LTTE) and third-body perturbations, while in case of another 11 systems, pure LTTE solutions are found to be satisfactory. In the remaining two systems, we identify extra eclipses connected to the outer component, but for the incomplete and noisy ETV curves, we are unable to find realistic three-body solutions. Therefore, in these cases we give only the outer period.

Funder

NKFIH

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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