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TICs 167692429 and 220397947: the first compact hierarchical triple stars discovered with TESS

Borkovits, T. and Rappaport, S. and Hajdu, T. and Maxted, P. F. L. and Pal, A. and Forgács-Dajka, E and Klagyivik, Peter and Mitnyan, T. (2020) TICs 167692429 and 220397947: the first compact hierarchical triple stars discovered with TESS. Monthly Notices of the Royal Astronomical Society, 493 (4), pp. 5005-5023. Oxford University Press. doi: 10.1093/mnras/staa495. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/493/4/5005/5739936

Abstract

We report the discovery and complex analyses of the first two compact hierarchical triple star systems discovered with TESS in or near its southern continuous viewing zone during Year 1. Both TICs 167692429 and 220397947 were previously unknown eclipsing binaries, and the presence of a third companion star was inferred from eclipse timing variations exhibiting signatures of strong third-body perturbations and, in the first system, also from eclipse depth variations. We carried out comprehensive analyses, including the simultaneous photodynamical modelling of TESS and archival ground-based WASP light curves, as well as eclipse timing variation curves. Also, for the first time, we included in the simultaneous fits multiple star spectral energy distribution data and theoretical PARSEC stellar isochrones, taking into account Gaia DR2 parallaxes and catalogued metallicities. We find that both systems have twin F-star binaries and a lower mass tertiary star. In the TIC 167692429 system, the inner binary is moderately inclined (Imut = 27°) with respect to the outer orbit, and the binary versus outer (triple) orbital periods are 10.3 versus 331 d, respectively. The mutually inclined orbits cause a driven precession of the binary orbital plane that leads to the disappearance of binary eclipses for long intervals. In the case of TIC 220397947, the two orbital planes are more nearly aligned and the inner versus outer orbital periods are 3.5 and 77 d, respectively. In the absence of radial velocity observations, we were unable to calculate highly accurate masses and ages for the two systems. According to stellar isochrones TIC 167692429 might be either a pre-main sequence (MS) or an older post-MS system. In the case of TIC 220397947, our solution prefers a young pre-MS scenario.

Item URL in elib:https://elib.dlr.de/137205/
Document Type:Article
Title:TICs 167692429 and 220397947: the first compact hierarchical triple stars discovered with TESS
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Borkovits, T.Baja Astronomical Observatory of Szeged University, Szegedi ́ut, Kt. 766, H-6500 Baja, Hungary; Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Konkoly Thege Mikl ́os ́ut 15-17, H-1121 Budapest, HungaryUNSPECIFIED
Rappaport, S.Department of Physics and Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, MA, 02139, USAUNSPECIFIED
Hajdu, T.Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Konkoly Thege Mikl ́os ́ut 15-17, H-1121 Budapest, Hungary; MTA CSFK Lend ̈ulet Near-Field Cosmology Research Group, Konkoly Thege Mikl ́os ́ut 15-17, H-1121 Budapest, HungaryUNSPECIFIED
Maxted, P. F. L.Astrophysics Group, Keele University, UKUNSPECIFIED
Pal, A.Konkoly Observatory, HungaryUNSPECIFIED
Forgács-Dajka, EEötvös UniversityUNSPECIFIED
Klagyivik, PeterPeter.Klagyivik (at) dlr.dehttps://orcid.org/0000-0003-0700-6176
Mitnyan, T.Baja Astronomical Observatory of Szeged University, Szegedi ́ut, Kt. 766, H-6500 Baja, HungaryUNSPECIFIED
Date:April 2020
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:493
DOI :10.1093/mnras/staa495
Page Range:pp. 5005-5023
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:binaries: eclipsing, binaries: close, stars: individual: TIC 167692429, stars: individual: TIC220397947, Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Klagyivik, Peter
Deposited On:06 Nov 2020 10:33
Last Modified:06 Nov 2020 10:33

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