TIC 278825952: a triply eclipsing hierarchical triple system with the most intrinsically circular outer orbit

Abstract

We report the discovery of a compact triply eclipsing triple star system in the southern continuous viewing zone of the TESS space telescope. TIC 278825952 is a previously unstudied, circular eclipsing binary with a period of 4.781 days with a tertiary component in a wider, circular orbit of 235.55 days period that was found from three sets of third-body eclipses and from light travel-time effect dominated eclipse timing variations. We performed a joint photodynamical analysis of the eclipse timing variation curves, photometric data, and the spectral energy distribution, coupled with the use of PARSEC stellar isochrones. We find that the inner binary consists of slightly evolved, near twin stars of masses of 1.12 and 1.09 $M_{\odot }$ and radii of 1.40 and 1.31 $R_{\odot }$. The third, less massive star has a mass of 0.75 $M_{\odot }$ and radius of 0.70 $R_{\odot }$. The low mutual inclination and eccentricities of the orbits show that the system is highly coplanar and surprisingly circular.

References in corpus (39)

• Gaia Data Release 2. Summary of the contents and survey properties
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• The Transiting Exoplanet Survey Satellite
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• The WASP Project and the SuperWASP Cameras
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• A Computational Guide to Physics of Eclipsing Binaries. Paper I. Demonstrations and Perspectives
• The Eccentric Kozai-Lidov Effect and Its Applications
• The TESS Input Catalog and Candidate Target List
• Correcting systematic effects in a large set of photometric lightcurves
• The Radial Velocity Experiment (RAVE): Fifth Data Release
• New Grids of ATLAS9 Model Atmospheres
• The Runts of the Litter: Why planets formed through gravitational instability can only be failed binary stars
• Wotan: Comprehensive time-series de-trending in Python
• Mergers and Obliquities in Stellar Triples
• A fast hybrid algorithm for exoplanetary transit searches
• A Comprehensive Study of the Kepler Triples via Eclipse Timing
• Kepler Eclipsing Binary Stars. IV. Precise Eclipse Times for Close Binaries and Identification of Candidate Three-Body Systems
• The ASAS-SN Catalog of Variable Stars III: Variables in the Southern TESS Continuous Viewing Zone
• FITSH -- a software package for image processing
• Eclipse Timing Variation Analyses of Eccentric Binaries with Close Tertiaries in the Kepler field
• Formation of close binaries by disc fragmentation and migration, and its statistical modeling
• Dynamical Formation of Close Binaries During the Pre-main-sequence Phase
• The evolution of stellar triples: The most common evolutionary pathways
• The TESS-HERMES survey Data Release 1: high-resolution spectroscopy of the TESS southern continuous viewing zone
• APASS Landolt-Sloan BVgri photometry of RAVE stars. I. Data, effective temperatures and reddenings
• HD 181068: A Red Giant in a Triply-Eclipsing Compact Hierarchical Triple System
• Formation of the Galactic Millisecond Pulsar Triple System PSR J0337+1715 - a Neutron Star with Two Orbiting White Dwarfs
• Orbit alignment in triple stars
• Dynamical formation & scattering of hierarchical triples: Cross sections, Kozai-Lidov oscillations, and collisions
• Dynamical masses, absolute radii and 3D orbits of the triply eclipsing star HD 181068 from Kepler photometry
• Circumbinary planets - why they are so likely to transit
• Photodynamical analysis of the triply eclipsing hierarchical triple system EPIC 249432662
• The evolution of triples with a Roche-lobe filling outer star
• Secular and tidal evolution of circumbinary systems
• TICs 167692429 and 220397947: The first compact hierarchical triple stars discovered with TESS
• Circumbinary planets II - when transits come and go
• The Compact Triply Eclipsing Triple Star TIC 209409435 Discovered with TESS

Cited by in corpus (17)

• Six New Compact Triply Eclipsing Triples Found With TESS
• Triply eclipsing triple stars in the northern TESS fields: TICs 193993801, 388459317 and 52041148
• Newly identified compact hierarchical triple system candidates using Gaia DR3
• A Study of Nine Triply Eclipsing Triples
• Classification of OGLE eclipsing binary stars based on their morphology type with Locally Linear Embedding
• Von Zeipel - Lidov - Kozai cycles in action: $Kepler$ triples with eclipse depth variations: KICs 6964043, 5653126, 5731312 and 8023317
• Eclipse timing variation analysis of OGLE-IV eclipsing binaries toward the Galactic Bulge. II. Short periodic triple stellar systems
• Then and now: A new look at the eclipse timing variations of hierarchical triple star candidates in the primordial $Kepler$-field, revisited by TESS
• Mysterious Dust-emitting Object Orbiting TIC 400799224
• TIC 290061484: A Triply Eclipsing Triple System with the Shortest Known Outer Period of 24.5 Days
• TIC 114936199: A Quadruple Star System with a 12-day Outer Orbit Eclipse
• Analytic Light Curve for Mutual Transits of Two Bodies Across a Limb-darkened Star
• CoRoT-TESS eclipsing binaries with light-travel-time effect
• Precision timing of eclipsing binaries from TESS full frame images. Method and performance
• Ten new, ultracompact triply eclipsing triple star systems
• Spectroscopy of Eclipsing Compact Hierarchical Triples I
• Discovery of a compact hierarchical triple main-sequence star system while searching for binary stars with compact objects