Investigating the flyby scenario for the HD 141569 system

Abstract

HD 141569, a triple star system, has been intensively observed and studied for its massive debris disk. It was rather regarded as a gravitationally bound triple system but recent measurements of the HD 141569A radial velocity seem to invalidate this hypothesis. The flyby scenario has therefore to be investigated to test its compatibility with the observations. We present a study of the flyby scenario for the HD141569 system, by considering 3 variants: a sole flyby, a flyby associated with one planet and a flyby with two planets. We use analytical calculations and perform N-body numerical simulations of the flyby encounter. The binary orbit is found to be almost fixed by the observational constraint on a edge-on plane with respect to the observers. If the binary has had an influence on the disk structure, it should have a passing time at the periapsis between 5000 and 8000 years ago and a distance at periapsis between 600 and 900 AU. The best scenario for reproducing the disk morphology is a flyby with only 1 planet. For a 2 Mj (resp. 8 Mj) planet, its eccentricity must be around 0.2 (resp. below 0.1). In the two cases, its apoapsis is about 130 AU. Although the global disk shape is reasonably well reproduced, some features cannot be explain by the present model and the likehood of the flyby event remains an issue. Dynamically speaking, HD 141569 is still a puzzling system.

References in corpus (2)

• Outer edges of debris discs: how sharp is sharp?
• Modeling the gas-phase chemistry of the transitional disk around HD 141569A

Cited by in corpus (11)

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• First detection of orbital motion for HD 106906 b: A wide-separation exoplanet on a Planet Nine-like orbit
• A Near-coplanar Stellar Flyby of the Planet Host Star HD 106906
• Circumstellar disks and planets. Science cases for next-generation optical/infrared long-baseline interferometers
• ALMA and VLA Observations of the HD 141569 System
• Revealing asymmetrical dust distribution in the inner regions of HD 141569
• The GRAVITY Young Stellar Object survey VIII. Gas and dust faint inner rings in the hybrid disk of HD141569
• Search for Stellar Flybys in the Sco-Cen OB Association with the Gaia DR2
• Dynamical Fates of S-Type Planetary Systems in Embedded Cluster Environments