Common envelope evolution in born-again planetary nebulae -- Shaping the H-deficient ejecta of A30
arXiv:2204.08501 · doi:10.1093/mnras/stac1697
Abstract
Born-again planetary nebulae (PNe) are extremely rare cases in the evolution of solar-like stars. It is commonly accepted that their central stars (CSPN) experienced a very late thermal pulse (VLTP), ejecting H-deficient material inside the evolved H-rich PN. Given the short duration of this event and the fast subsequent evolution of the CSPN, details of the mass ejection are unknown. We present the first morpho-kinematic model of the H-deficient material surrounding a born-again PN, namely A30. New San Pedro Mártir observations with the Manchester Echelle Spectrograph were recently obtained to map the inner region of A30 which are interpreted by means of the software SHAPE in conjunction with HST WFC3 images. The SHAPE morpho-kinematic model that best reproduces the observations is composed by a disrupted disk tilted with respect to the line of sight and a pair of orthogonal opposite bipolar ejections. We confirm previous suggestions that the structures closer to the CSPN present the highest expansion velocities, that is, the disrupted disk expands faster than the farther bipolar features. We propose that the current physical structure and abundance discrepancy of the H-deficient clumps around the CSPN of A30 can be explained by a common envelope phase following the VLTP event. Our proposed scenario is also compared with other known born-again PNe (A58, A78, HuBi1 and the Sakurai's Object).
9 pages, 6 figures, 1 table; Accepted to MNRAS
References in corpus (15)
- Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
- Bipolar planetary nebulae from common envelope evolution of binary stars
- A dense disk of dust around the born-again Sakurai's object
- Expansion of hydrogen-poor knots in the born-again planetary nebulae A30 and A78
- Common Envelope Evolution on the Asymptotic Giant Branch: Unbinding within a Decade?
- Common Envelope Shaping of Planetary Nebulae. III. The Launching of Jets in Proto-Planetary Nebulae
- The born-again planetary nebula A78: an X-ray twin of A30
- Abell 30 -- A Binary Central Star Among the Born-Again Planetary Nebulae
- Carbon dust in the evolved born-again planetary nebulae A30 and A78
- The infrared view of dust and molecules around V4334 Sgr (Sakurai's Object): a 20-year retrospective
- Discovery of a Fast Expanding Shell in the Inside-out Born-Again Planetary Nebula HuBi 1 Through High-Dispersion Integral Field Spectroscopy
- Chemistry and physical properties of the born-again planetary nebula HuBi 1
- (sub)Millimeter Emission Lines of Molecules in Born-again Stars
- First images of the molecular gas around a born-again star revealed by ALMA
- Abundance Analysis of the J4 Equatorial Knot of the Born-again Planetary Nebula A30