The binary fraction of planetary nebula central stars: the promise of VPHAS+

Abstract

The majority of planetary nebulae (PNe) are not spherical, and current single-star models cannot adequately explain all the morphologies we observe. This has led to the Binary Hypothesis, which states that PNe are preferentially formed by binary systems. This hypothesis can be corroborated or disproved by comparing the estimated binary fraction of all PNe central stars (CS) to that of the supposed progenitor population. One way to quantify the rate of CS binarity is to detect near infra-red (IR) excess indicative of a low-mass main sequence companion. In this paper, a sample of known PNe within data release 2 of the ongoing VPHAS+ are investigated. We give details of the method used to calibrate VPHAS+ photometry, and present the expected colours of CS and main sequence stars within the survey. Objects were scrutinized to remove PN mimics from our sample and identify true CS. Within our final sample of 7 CS, 6 had previously either not been identified or confirmed. We detected an $i$ band excess indicative of a low-mass companion star in 3 CS, including one known binary, leading us to to conclude that VPHAS+ provides the precise photometry required for the IR excess method presented here, and will likely improve as the survey completes and the calibration process finalised. Given the promising results from this trial sample, the entire VPHAS+ catalogue should be used to study PNe and extend the IR excess-tested CS sample.

arXiv comment21 pages, 9 figures, accepted for publication in MNRAS

References in corpus (32)

• Astropy: A Community Python Package for Astronomy
• A Survey of Stellar Families: Multiplicity of Solar-Type Stars
• An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
• Stellar Diameters and Temperatures II. Main Sequence K & M Stars
• Post-Asymptotic Giant Branch Evolution of Low- and Intermediate-Mass Stars. Preliminary Results
• New models for the evolution of Post-Asymptotic Giant Branch stars and Central Stars of Planetary Nebulae
• The Origin and Shaping of Planetary Nebulae: Putting the Binary Hypothesis to the Test
• The VST Photometric Halpha Survey of the Southern Galactic Plane and Bulge (VPHAS+)
• The Molonglo Galactic Plane Survey (MGPS-2): Compact Source Catalogue
• The Hα surface brightness - radius relation: a robust statistical distance indicator for planetary nebulae
• The Blue Tip of the Stellar Locus: Measuring Reddening with the SDSS
• Binary planetary nebulae nuclei towards the Galactic bulge. II. A penchant for bipolarity and low-ionisation structures
• Optical atmospheric extinction over Cerro Paranal
• Binarity and the abundance discrepancy problem in planetary nebulae
• Observational Confirmation of a Link Between Common Envelope Binary Interaction and Planetary Nebula Shaping
• Sulfur, Chlorine, & Argon Abundances in Planetary Nebulae. I: Observations and Abundances in a Northern Sample
• The binary fraction of planetary nebula central stars I. A high-precision, I-band excess search
• Single Rotating Stars and the Formation of Bipolar Planetary Nebula
• NGC 6778: Strengthening the link between extreme abundance discrepancy factors and central star binarity in planetary nebulae
• The post-common envelope central stars of the planetary nebulae Henize 2-155 and Henize 2-161
• Angular diameters, fluxes and extinction of compact planetary nebulae: further evidence for steeper extinction towards the Bulge
• High-velocity collimated outflows in planetary nebulae: NGC 6337, He 2-186, and K 4-47
• IPHAS extinction distances to Planetary Nebulae
• Binary Central Stars of Planetary Nebulae Discovered Through Photometric Variability V: The Central Stars of HaTr 7 and ESO 330-9
• Abell 48 - a rare WN-type central star of a planetary nebula
• New Planetary Nebulae in the Galactic Bulge region with l>0deg - I. Discovery method and first results
• The planetary nebula Abell 48 and its [WN] nucleus
• Radio-continuum detections of Galactic Planetary Nebulae I. MASH PNe detected in large-scale radio surveys
• Where Are the Binaries? Results of a Long-Term Search for Radial Velocity Binaries in Proto-Planetary Nebulae
• The Central Star Candidate of the Planetary Nebula Sh2-71: Photometric and Spectroscopic Variability
• The Interstellar Extinction Toward the Milky Way Bulge with Planetary Nebulae, Red Clump, and RR Lyrae stars
• Preliminary analysis of photometric variations of central star of planetary nebula Sh 2-71

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