Observational Confirmation of a Link Between Common Envelope Binary Interaction and Planetary Nebula Shaping

Abstract

A current issue in the study of planetary nebulae with close binary central stars is the extent to which the binaries affect the shaping of the nebulae. Recent studies have begun to show a high coincidence rate between nebulae with large-scale axial or point symmetries and close binary stars. In addition, combined binary-star and spatio-kinematic modeling of the nebulae have demonstrated that all of the systems studied to date appear to have their central binary axis aligned with the primary axis of the nebula. Here we add two more systems to the list, the central stars and nebulae of NGC 6337 and Sp 1. We show both systems to be low inclination, with their binary axis nearly aligned with our line-of-sight. Their inclinations match published values for the inclinations of their surrounding nebulae. Including these two systems with the existing sample statistically demonstrates a direct link between the central binary and the nebular morphology. In addition to the systems' inclinations we give ranges for other orbital parameters from binary modeling, including updated orbital periods for the binary central stars of NGC 6337 and Sp 1.

Accepted for publication in the Astrophysical Journal. In the previously uploaded version of this paper, Figure 7 was displayed rotated 180 degrees. That and minor additional editorial items have been corrected

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Cited by in corpus (6)

• Binary Central Stars of Planetary Nebulae Discovered Through Photometric Variability V: The Central Stars of HaTr 7 and ESO 330-9
• The planetary nebula IC 4776 and its post-common-envelope binary central star
• Where Are the Binaries? Results of a Long-Term Search for Radial Velocity Binaries in Proto-Planetary Nebulae
• Accounting for planet-shaped planetary nebulae
• Neutron-capture element abundances in the planetary nebula NGC 5315 from deep optical and near-infrared spectrophotometry
• On the possible triple central star system of PN SuWt 2: No ménage à trois at the heart of the Wedding Ring