The post-common-envelope binary central star of the planetary nebula ETHOS 1

Abstract

We present a detailed study of the binary central star of the planetary nebula ETHOS 1 (PN G068.1+11.0). Simultaneous modelling of light and radial velocity curves reveals the binary to comprise a hot and massive pre-white-dwarf with an M-type main-sequence companion. A good fit to the observations was found with a companion that follows expected mass-temperature-radius relationships for low-mass stars, indicating that despite being highly irradiated it is consistent with not being significantly hotter or larger than a typical star of the same mass. Previous modelling indicated that ETHOS 1 may comprise the first case where the orbital plane of the central binary does not lie perpendicular to the nebular symmetry axis, at odds with the expectation that the common envelope is ejected in the orbital plane. We find no evidence for such a discrepancy, deriving a binary inclination in agreement with that of the nebula as determined by spatio-kinematic modelling. This makes ETHOS 1 the ninth post-common-envelope planetary nebula in which the binary orbital and nebular symmetry axes have been shown to be aligned, with as yet no known counter-examples. The probability of finding such a correlation by chance is now less than 0.00002%.

arXiv comment8 pages, 4 figures, accepted for publication in MNRAS

References in corpus (50)

• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• Stellar Diameters and Temperatures II. Main Sequence K & M Stars
• New Grids of ATLAS9 Model Atmospheres
• New models for the evolution of Post-Asymptotic Giant Branch stars and Central Stars of Planetary Nebulae
• Post-Asymptotic Giant Branch Evolution of Low- and Intermediate-Mass Stars. Preliminary Results
• Stellar yields from metal-rich asymptotic giant branch models
• Physics Of Eclipsing Binaries. II. Towards the Increased Model Fidelity
• The White Dwarf Initial-Final Mass Relation for Progenitor Stars From 0.85 to 7.5 M${}_{\odot }$
• Yields of AGB and SAGB models with chemistry of low- and high-metallicity Globular Clusters
• Interrelated Main-Sequence Mass-Luminosity, Mass-Radius and Mass-Effective Temperature Relations
• Mocassin: A fully three-dimensional Monte Carlo photoionization code
• The Hα surface brightness - radius relation: a robust statistical distance indicator for planetary nebulae
• First science with SALT: peering at the accreting polar caps of the eclipsing polar SDSS J015543.40+002807.2
• A Hubble Space Telescope Survey for Resolved Companions of Planetary-Nebula Nuclei
• Binary Planetary Nebulae Nuclei towards the Galactic Bulge. I. Sample Discovery, Period Distribution and Binary Fraction
• Binary stars as the key to understanding planetary nebulae
• The Magellanic Cloud Calibration of the Galactic Planetary Nebula Distance Scale
• The scatter of the M dwarf mass-radius relationship
• The Chandra X-ray Survey of Planetary Nebulae (ChanPlaNS): Probing Binarity, Magnetic Fields, and Wind Collisions
• 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
• Electron temperatures and densities of planetary nebulae determined from the nebular hydrogen recombination spectrum and temperature and density variations
• Physics of Eclipsing Binaries. III. Spin-Orbit Misalignment
• Physics of Eclipsing Binaries. IV. The impact of interstellar extinction on the light curves of eclipsing binaries
• Identifying close binary central stars of PN with Kepler
• ETHOS 1: A high latitude planetary nebula with jets forged by a post common envelope binary central star
• A carbon dwarf wearing a Necklace: first proof of accretion in a post-common-envelope binary central star of a planetary nebula with jets
• The post-common envelope central stars of the planetary nebulae Henize 2-155 and Henize 2-161
• Gravity and limb-darkening coefficients for compact stars: DA, DB, and DBA eclipsing white dwarfs
• Proof of polar ejection fom the close-binary core of the planetary nebula Abell 63
• Post Common Envelope Binaries from SDSS - III. Seven new orbital periods
• Abell 41: shaping of a planetary nebula by a binary central star?
• Two-colour photometry of the binary planetary nebula nuclei UU Sagitte and V477 Lyrae: oversized secondaries in post-common-envelope binaries
• SALT reveals the barium central star of the planetary nebula Hen 2-39
• Binary Central Stars of Planetary Nebulae Discovered Through Photometric Variability V: The Central Stars of HaTr 7 and ESO 330-9
• C/O ratios in planetary nebulae with dual-dust chemistry from faint optical recombination lines
• The short orbital period binary star at the heart of the planetary nebula M 3-1
• Two rings but no fellowship: LoTr 1 and its relation to planetary nebulae possessing barium central stars
• NGC 6778: a disrupted planetary nebula around a binary central star
• The planetary nebula IPHASXJ211420.0+434136 (Ou5): insights into common-envelope dynamical and chemical evolution
• A study of the kinematics and binary-induced shaping of the planetary nebula HaTr 4
• Discovery of Eclipsing Binary Central Stars in the Planetary Nebulae M 3-16, H 2-29 and M 2-19
• Bolometric treatment of irradiation effects: general discussion and application to binary stars
• The post-common-envelope X-ray binary nucleus of the planetary nebula NGC 2392
• New models for the evolution of central stars of planetary nebulae: Faster and Brighter

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• The double-degenerate, super-Chandrasekhar nucleus of the planetary nebula Henize 2-428
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• The ionised and molecular mass of post-common-envelope planetary nebulae. The missing mass problem
• The future influence of six exoplanets on the envelope properties of their parent stars on the giant branches
• YY Hya and its interstellar environment
• The variability and radial velocity of planetary nebulae central stars
• A detailed study of the barium central star of the planetary nebula Abell 70
• Appraising the Necklace: A post-common-envelope carbon dwarf inside an apparently carbon-poor planetary nebula
• Two hot pre-white dwarfs inside the red-giant-branch planetary nebula Pa 13 -- Double core evolution or common envelope-induced rejuvenation?
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