The formation of the magnetic symbiotic star FN Sgr
arXiv:2402.08647 · doi:10.1051/0004-6361/202449602
Abstract
To shed light on the origin of magnetic symbiotic stars, we investigated the system FN Sgr in detail. We searched for a reasonable formation pathway to explain its stellar and binary parameters including the magnetic field of the accreting white dwarf. We used the MESA code to carry out pre-CE and post-CE binary evolution and determined the outcome of CE evolution assuming the energy formalism. For the origin and evolution of the white dwarf magnetic field, we adopted the crystallization scenario. We found that FN Sgr can be explained as follows. First, a non-magnetic white dwarf is formed through CE evolution. Later, during post-CE evolution, the white dwarf starts to crystallize and a weak magnetic field is generated. After a few hundred Myr, the magnetic field penetrates the white dwarf surface and becomes detectable. Meanwhile, its companion evolves and becomes an evolved red giant. Subsequently, the white dwarf accretes part of the angular momentum from the red giant stellar winds. As a result, the white dwarf spin period decreases and its magnetic field reaches super-equipartition, getting amplified due to a rotation- and crystallization-driven dynamo. The binary then evolves into a symbiotic star, with a magnetic white dwarf accreting from an evolved red giant through atmospheric Roche-lobe overflow. We conclude that the rotation- and crystallization-driven dynamo scenario, or any age-dependent scenario, can explain the origin of magnetic symbiotic stars reasonably well. This adds another piece to the pile of evidence supporting this scenario. If our formation channel is correct, our findings suggest that white dwarfs in most symbiotic stars formed through CE evolution might be magnetic, provided that the red giant has spent >3 Gyr as a main-sequence star.
Accepted for publication in A&A
References in corpus (61)
- Modules for Experiments in Stellar Astrophysics (MESA)
- Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
- Modules for Experiments in Stellar Astrophysics (MESA): Time-Dependent Convection, Energy Conservation, Automatic Differentiation, and Infrastructure
- Updated Electron-Conduction Opacities: The Impact on Low-Mass Stellar Models
- On the Spectral Evolution of Hot White Dwarf Stars. I. A Detailed Model-Atmosphere Analysis of Hot White Dwarfs from SDSS DR12
- Post-common-envelope binaries from SDSS. IX: Constraining the common-envelope efficiency
- Binary Star Origin of High Field Magnetic White Dwarfs
- Coulomb tunneling for fusion reactions in dense matter: Path integral Monte Carlo versus mean field
- Type Ia Supernova Explosions in Binary Systems: A Review
- Current challenges in the physics of white dwarf stars
- Skye: A Differentiable Equation of State
- The origin and evolution of magnetic white dwarfs in close binary stars
- NGC 6819: testing the asteroseismic mass scale, mass loss, and evidence for products of non-standard evolution
- Recombination energy in double white dwarf formation
- A common origin of magnetism from planets to white dwarfs
- On the role of recombination in common-envelope ejections
- Progenitors of type Ia supernovae
- New insight into the magnetism of degenerate stars from the analysis of a volume limited sample of white dwarfs
- Common envelopes in massive stars: Towards the role of radiation pressure and recombination energy in ejecting red supergiant envelopes
- Multiple channels for the onset of magnetism in isolated white dwarfs
- Monte Carlo simulations of post-common-envelope white dwarf + main sequence binaries: The effects of including recombination energy
- 123-321 Models of Classical Novae
- A two-stage formalism for common-envelope phases of massive stars
- A Spectro-photometric Analysis of Cool White Dwarfs in the Gaia and Pan-STARRS Footprint
- Formation of sdB-stars via common envelope ejection by substellar companions
- Convective boundary mixing in main-sequence stars: theory and empirical constraints
- First detection and characterization of symbiotic stars in M31
- Magnetic white dwarfs in post-common-envelope binaries
- Heat transport and convective velocities in compositionally-driven convection in neutron star and white dwarf interiors
- Period bouncers as detached magnetic cataclysmic variables
- Discovery of the first symbiotic star in NGC6822
- Are white dwarf magnetic fields in close binaries generated during common-envelope evolution?
- A fast spinning magnetic white dwarf in the double-degenerate, super-Chandrasekhar system NLTT 12758
- The OmegaWhite Survey for short period variable stars II: An overview of results from the first four years
- Magnetic dynamos in white dwarfs -- II. Relating magnetism and pollution
- Magnetic field breakout from white dwarf crystallization dynamos
- A Survey of the Local Group of Galaxies for Symbiotic Binary Stars. I. First detection of symbiotic stars in M33
- Gaia18aen: First symbiotic star discovered by Gaia
- Catalog of magnetic white dwarfs with hydrogen dominated atmospheres
- A Short Intense Dynamo at the Onset of Crystallization in White Dwarfs
- Magnetic dynamos in white dwarfs -- I. Explaining the dearth of bright intermediate polars in globular clusters
- Chemical abundance analysis of 13 southern symbiotic giants from high-resolution spectra at ~1.56 μm
- Spectroscopic and photometric analysis of symbiotic candidates -- I. Ten candidates on classical symbiotic stars
- Discovery of five new Galactic symbiotic stars in the VPHAS+ survey
- On the absence of symbiotic stars in globular clusters
- Formation of long-period post-common-envelope binaries I. No extra energy is needed to explain oxygen-neon white dwarfs paired with AFGK-type main-sequence stars
- Can we reveal the core-chemical composition of ultra-massive white dwarfs through their magnetic fields?
- SRGA J181414.6-225604: A new Galactic symbiotic X-ray binary outburst triggered by an intense mass loss episode of a heavily obscured Mira variable
- Where are the missing symbiotic stars? Uncovering hidden Symbiotic Stars in public catalogues
- SU Lyn -- a transient symbiotic star
- Formation of long-period post-common-envelope binaries II. Explaining the self-lensing binary KOI 3278
- Unveiling the white dwarf in J191213.72-441045.1 through ultraviolet observations
- Cataclysmic variables are a key population of gravitational wave sources for LISA
- Hen 3-860: New southern eclipsing symbiotic star observed in the outburst
- Chemical abundance analysis of symbiotic giants. I. RW Hya and SY Mus
- Chemical abundance analysis of symbiotic giants. Metallicity and CNO abundance patterns in 14 northern S-type systems
- DeGaPe 35: Amateur discovery of a new southern symbiotic star
- THA 15-31: Discovery with VLT/X-Shooter and Swift/UVOT of a new symbiotic star of the accreting-only variety
- Chemical abundance analysis of symbiotic giants - II. AE Ara, BX Mon, KX TrA, and CL Sco
- Recurrent mini-outbursts and a magnetic white dwarf in the symbiotic system FN Sgr
- Photometry and spectroscopy of the new symbiotic star 2SXPS J173508.4-292958
Cited by in corpus (9)
- Wide post-common envelope binaries from Gaia: orbit validation and formation models
- Symbiotic stars in the era of modern ground- and space-based surveys
- Magnetic field evolution for crystallization-driven dynamos in C/O white dwarfs
- No longer impossible: the self-lensing binary KIC 8145411 is a triple
- The Local Group Symbiotic Star Population and its Tenuous Link with Type Ia Supernovae
- Suggested magnetic braking prescription derived from field complexity fails to reproduce the cataclysmic variable orbital period gap
- Resolution of a paradox: SDSS J1257+5428 can be explained as a descendant of a cataclysmic variable with an evolved donor
- White dwarf eccentricity fluctuation and dissipation by AGB convection
- From Main Sequence Binary to Blast: MESA Modeling of the Double-Detonation Progenitor PTF1~J2238+7430