The planetary nebula IC 4776 and its post-common-envelope binary central star

Abstract

We present a detailed analysis of IC 4776, a planetary nebula displaying a morphology believed to be typical of central star binarity. The nebula is shown to comprise a compact hourglass-shaped central region and a pair of precessing jet-like structures. Time-resolved spectroscopy of its central star reveals periodic radial velocity variability consistent with a binary system. While the data are insufficient to accurately determine the parameters of the binary, the most likely solutions indicate that the secondary is probably a low-mass main sequence star. An empirical analysis of the chemical abundances in IC 4776 indicates that the common-envelope phase may have cut short the AGB evolution of the progenitor. Abundances calculated from recombination lines are found to be discrepant by a factor of approximately two relative to those calculated using collisionally excited lines, suggesting a possible correlation between low abundance discrepancy factors and intermediate-period post-common-envelope central stars and/or Wolf-Rayet central stars. The detection of a radial velocity variability associated with binarity in the central star of IC 4776 may be indicative of a significant population of (intermediate-period) post-common-envelope binary central stars which would be undetected by classic photometric monitoring techniques.

Accepted for publication in MNRAS

References in corpus (56)

• Astropy: A Community Python Package for Astronomy
• Common Envelope Evolution: Where we stand and how we can move forward
• The Origin and Shaping of Planetary Nebulae: Putting the Binary Hypothesis to the Test
• Simulating the Common Envelope Phase of a Red Giant Using SPH and Uniform Grid Codes
• On the alpha formalism for the common envelope interaction
• The Hα surface brightness - radius relation: a robust statistical distance indicator for planetary nebulae
• Binary Planetary Nebulae Nuclei towards the Galactic Bulge. I. Sample Discovery, Period Distribution and Binary Fraction
• Ionization Correction Factors for Planetary Nebulae: I- Using optical spectra
• Binary stars as the key to understanding planetary nebulae
• The effect of common-envelope evolution on the visible population of post-common-envelope binaries
• Binary planetary nebulae nuclei towards the Galactic bulge. II. A penchant for bipolarity and low-ionisation structures
• The Magellanic Cloud Calibration of the Galactic Planetary Nebula Distance Scale
• Isolated vs. Common Envelope Dynamos in Planetary Nebula Progenitors
• Post common envelope binaries from SDSS. XII: The orbital period distribution
• A deep survey of heavy element lines in planetary nebulae - I. Observations and forbidden-line densities, temperatures and abundances
• Evolution of Massive Black Hole Binaries
• Binarity and the abundance discrepancy problem in planetary nebulae
• Observational Confirmation of a Link Between Common Envelope Binary Interaction and Planetary Nebula Shaping
• The Necklace: equatorial and polar outflows from the binary central star of the new planetary nebula IPHASXJ194359.5+170901
• Binary central stars of PN discovered through photometric variability. I. What we know and what we would like to find out
• An Interacting Binary System Powers Precessing Outflows of an Evolved Star
• Elemental abundances of Galactic bulge planetary nebulae from optical recombination lines
• Physical conditions in the planetary nebula Abell 30
• Why Magnetic Fields Cannot be the Main Agent Shaping Planetary Nebulae
• Electron temperatures and densities of planetary nebulae determined from the nebular hydrogen recombination spectrum and temperature and density variations
• Close stellar binary systems by grazing envelope evolution
• Oxygen enrichment in carbon-rich planetary nebulae
• Constraints on Common Envelope Magnetic Fields from Observations of Jets in Planetary Nebulae
• ETHOS 1: A high latitude planetary nebula with jets forged by a post common envelope binary central star
• Single Rotating Stars and the Formation of Bipolar Planetary Nebula
• The mixed chemistry phenomenon in Galactic Bulge PNe
• NGC 6778: Strengthening the link between extreme abundance discrepancy factors and central star binarity in planetary nebulae
• The hydrogen-deficient knot of the `born again' planetary nebula Abell 58 (V605 Aql)
• A carbon dwarf wearing a Necklace: first proof of accretion in a post-common-envelope binary central star of a planetary nebula with jets
• ALFA: an automated line fitting algorithm
• Understanding and reducing statistical uncertainties in nebular abundance determinations
• Discovery of close binary central stars in the planetary nebulae NGC 6326 and NGC 6778
• The post-common envelope central stars of the planetary nebulae Henize 2-155 and Henize 2-161
• A radial velocity survey for post-common-envelope Wolf-Rayet central stars of planetary nebulae: First results and discovery of the close binary nucleus of NGC 5189
• Analysis of chemical abundances in planetary nebulae with [WC] central stars. II. Chemical abundances and the abundance discrepancy factor
• C/O abundance ratios, iron depletions, and infrared dust features in Galactic planetary nebulae
• The long-period binary central stars of the planetary nebulae NGC 1514 and LoTr 5
• Observations and 3D photoionisation modelling of the Wolf-Rayet planetary nebula NGC 1501
• Simulating the Onset of Grazing Envelope Evolution of Binary Stars
• The role of planets in shaping planetary nebulae
• Imaging the elusive H-poor gas in the high ADF planetary nebula NGC 6778
• PAH Formation in O-rich Planetary Nebulae
• The post-common-envelope, binary central star of the planetary nebula Hen 2-11
• The Double-Degenerate Nucleus of the Planetary Nebula TS 01. A Close Binary Evolution Showcase
• The outflows and 3D structure of NGC 6337, a planetary nebula with a close binary nucleus
• The impact of atomic data selection on nebular abundance determinations
• Problems for the WELS classification of planetary nebulae central stars: Self-consistent nebular modelling of four candidates
• Hydrodynamical Velocity Fields in Planetary Nebulae
• SALT HRS discovery of a long period double-degenerate binary in the planetary nebula NGC 1360
• New groups of planetary nebulae with peculiar dust chemistry towards the Galactic bulge
• Comments on the Final Orbital Separation in Common Envelope Evolution

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• Temperature inhomogeneities cause the abundance discrepancy in H II regions
• Density biases and temperature relations for DESIRED HII regions
• SALT HRS discovery of the binary nucleus of the Etched Hourglass Nebula MyCn 18
• C/O ratios in planetary nebulae with dual-dust chemistry from faint optical recombination lines
• Space Velocity and Time Span of Jets in Planetary Nebulae
• Accounting for planet-shaped planetary nebulae
• On the post-common-envelope central star of the planetary nebula NGC 2346
• IFU spectroscopy of Southern PNe: VII Photo-ionization modelling of intermediate excitation class objects
• The formation of `columns crowns' by jets interacting with a circumstellar dense shell
• Kinematical Investigation of Possible Fast Collimated Outflows in Twelve Planetary Nebulae
• The post-common-envelope binary nucleus of the planetary nebula IC~4776: Neither an anomalously long orbital period nor a Wolf-Rayet binary
• Counterparts of Far Eastern Guest Stars: Novae, supernovae, or something else?
• Simulating the shaping of point-symmetric structures in the jittering jets explosion mechanism
• Variable jets at the termination of the common envelope evolution
• [Fe II] 1.644$\mu$m imaging survey of planetary nebulae with low-ionisation structures