Hierarchical triple star systems towards the Galactic Bulge through OGLE's eye.

We report the result of eclipse timing variation (ETV) analyses of OGLE-IV eclipsing binaries (EBs). We have identified around 1000 potential triple (or multiple) system candidates and, in addition, we determined the orbital parameters and we carried out statistical analyses of the properties of the candidates. We found that (i) the distribution of the outer eccentricity has a maximum around e2 = 0.3; (ii) in most cases the estimated outer mass ratio is lower than q2 ∼ 0.5. Besides, we also present some systems that deserve special attention.

[1]  G. Marschalk'o,et al.  Eclipse timing variation analysis of OGLE-IV eclipsing binaries towards the Galactic Bulge – I. Hierarchical triple system candidates , 2019, Monthly Notices of the Royal Astronomical Society.

[2]  A. Tokovinin.  Dancing Twins: Stellar Hierarchies That Formed Sequentially? , 2018, 1802.06445.

[3]  Kaitlin M. Kratter,et al.  Dynamical Formation of Close Binaries during the Pre-main-sequence Phase , 2017, 1706.09894.

[4]  S. P. Portegies Zwart,et al.  The evolution of hierarchical triple star-systems , 2016, 1612.06172.

[5]  R. Poleski,et al.  The OGLE Collection of Variable Stars. Over 450 000 Eclipsing and Ellipsoidal Binary Systems Toward the Galactic Bulge , 2016, 1701.03105.

[6]  D. Dimitrov,et al.  Ultrashort-period main-sequence eclipsing systems: new observations and light-curve solutions of six NSVS binaries , 2015, 1501.05043.

[7]  S. Rappaport,et al.  Eclipse timing variation analyses of eccentric binaries with close tertiaries in the Kepler field , 2014, 1412.5759.

[8]  D. Fabrycky,et al.  MERGERS AND OBLIQUITIES IN STELLAR TRIPLES , 2014, 1405.5223.

[9]  S. Tremaine,et al.  Submitted to ApJ Preprint typeset using L ATEX style emulateapj v. 10/09/06 SHRINKING BINARY AND PLANETARY ORBITS BY KOZAI CYCLES WITH TIDAL FRICTION , 2022 .

[10]  F. Bouchy,et al.  Two new “very hot Jupiters” among the OGLE transiting candidates , 2004, astro-ph/0404264.

[11]  Seppo Mikkola,et al.  Tidal friction in triple stars , 1998 .

[12]  Marcin Kubiak,et al.  The Optical Gravitational Lensing Experiment , 1992 .