Issue |
A&A
Volume 678, October 2023
|
|
---|---|---|
Article Number | L1 | |
Number of page(s) | 5 | |
Section | Letters to the Editor | |
DOI | https://doi.org/10.1051/0004-6361/202347607 | |
Published online | 29 September 2023 |
Letter to the Editor
Stability and instability of strange dwarfs
1
Dipartimento di Fisica e Scienze della Terra, Universitá di Ferrara, Via Saragat 1, 44122 Ferrara, Italy
2
INFN Sezione di Ferrara, Via Saragat 1, 44122 Ferrara, Italy
e-mail: drago@fe.infn.it
3
Space Sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Bât. B5a, 4000 Liège, Belgium
Received:
30
July
2023
Accepted:
12
September
2023
Aims. More than 20 years ago, the existence of stable white dwarfs with a core of strange quark matter was proposed. More recently, via the study of radial modes, it has been concluded instead that such objects are unstable. We aim to clarify this issue.
Methods. We investigated the stability of these objects by looking at their radial oscillations while incorporating boundary conditions at the quark–hadron interface, which correspond to either a rapid or a slow conversion of hadrons into quarks.
Results. Our analysis shows that objects of this type are stable if the star is not strongly perturbed and ordinary matter cannot transform into strange quark matter because of the Coulomb barrier separating the two components. On the other hand, ordinary matter can be transformed into strange quark matter if the star undergoes a violent process, as in the preliminary stages of a type Ia supernova, and this causes the system to become unstable and collapse into a strange quark star. In this way, the accretion-induced collapse of strange dwarfs can be facilitated, and kilometre-sized objects with sub-solar masses can be produced.
Key words: white dwarfs / equation of state / stars: neutron / dark matter
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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