Analysis of White Dwarfs with Strange-Matter Cores
arXiv:astro-ph/0604366 · doi:10.1088/0954-3899/32/6/001
Abstract
We summarize masses and radii for a number of white dwarfs as deduced from a combination of proper motion studies, Hipparcos parallax distances, effective temperatures, and binary or spectroscopic masses. A puzzling feature of these data is that some stars appear to have radii which are significantly smaller than that expected for a standard electron-degenerate white-dwarf equations of state. We construct a projection of white-dwarf radii for fixed effective mass and conclude that there is at least marginal evidence for bimodality in the radius distribution forwhite dwarfs. We argue that if such compact white dwarfs exist it is unlikely that they contain an iron core. We propose an alternative of strange-quark matter within the white-dwarf core. We also discuss the impact of the so-called color-flavor locked (CFL) state in strange-matter core associated with color superconductivity. We show that the data exhibit several features consistent with the expected mass-radius relation of strange dwarfs. We identify eight nearby white dwarfs which are possible candidates for strange matter cores and suggest observational tests of this hypothesis.
arXiv comment11 pages, 6 figures, accepted for publication in J. Phys. G: Nucl. Part. Phys
References in corpus (16)
- Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
- Color-Flavor Locking and Chiral Symmetry Breaking in High Density QCD
- Strange Quark Matter and Compact Stars
- Photometric and Spectroscopic Analysis of Cool White Dwarfs with Trigonometric Parallax Measurements
- Enforced Electrical Neutrality of the Color-Flavor Locked Phase
- Electric fields at the quark surface of strange stars in the color-flavor locked phase
- Is RX J185635-375 a Quark Star?
- New Constraints on Neutron Star Cooling from Chandra Observations of 3C58
- Color-flavor locked strangelets
- High-density QCD pairing in compact star structure
- Mass-Radius Relation for Magnetic White Dwarfs
- 1E 1207.4-5209: a low-mass bare strange star?
- Mode identification of Pulsating White Dwarfs using the HST
- Rights and wrongs of the Hipparcos data: A critical assessment of the Hipparcos catalogue
- Strange Quark Matter in Stars: A General Overview
- Models Of Strange Stars With A Crust And Strange Dwarfs
Cited by in corpus (18)
- Generalized Uncertainty Principle: Approaches and Applications
- Pulsars as Astrophysical Laboratories for Nuclear and Particle Physics
- Generalized Uncertainty Principle, Black Holes, and White Dwarfs: A Tale of Two Infinities
- Generalized Uncertainty Principle and White Dwarfs Redux: How Cosmological Constant Protects Chandrasekhar Limit
- The DODO Survey II: A Gemini Direct Imaging Search for Substellar and Planetary Mass Companions around Nearby Equatorial and Northern Hemisphere White Dwarfs
- White dwarfs as test objects of Lorentz violations
- Effects of the Generalized Uncertainty Principle on Compact Stars
- On Modified Dispersion Relations and the Chandrasekhar Mass Limit
- Effect of Generalized Uncertainty Principle on Main-Sequence Stars and White Dwarfs
- UV and IR quantum-spacetime effects for the Chandrasekhar model
- Searching for Strange Quark Matter Objects Among White Dwarfs
- Consequence of total lepton number violation in strongly magnetized iron white dwarfs
- Probing Strange Stars with Advanced Gravitational Wave Detectors
- Quark-Novae in Low-mass X-ray Binaries II: Application to G87-7 and to GRB 110328A
- Does the Hubble Redshift Flip Photons and Gravitons?
- Structure of Strange Dwarfs with Color Superconducting Core
- Finite Temperature Considerations in the Structure of Quadratic GUP-modified White Dwarfs
- Rotating strange dwarfs and their indistinguishability from white dwarfs