| Full text | |
| Author(s): |
Otoniel, Edson
[1]
;
Coelho, Jaziel G.
[2, 3]
;
Nunes, Silvia P.
[4]
;
Malheiro, Manuel
[4]
;
Weber, Fridolin
[5, 6]
Total Authors: 5
|
| Affiliation: | [1] Univ Fed Cariri, Inst Formacao Educadores, R Olegario Emidio Araujo S-N, BR-63260000 Brejo Santo, CE - Brazil
[2] Inst Nacl Pesquisas Espaciais, Div Astrofis, Ave Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[3] Univ Tecnol Fed Parana, Dept Fis, BR-85884000 Medianeira, PR - Brazil
[4] Inst Tecnol Aeronaut, Dept Fis, Praca Marechal Eduardo Gomes 50, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[5] Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 - USA
[6] San Diego State Univ, Dept Phys, 5500 Campanile Dr, San Diego, CA 92182 - USA
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | Astronomy & Astrophysics; v. 656, DEC 3 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
CTCV J2056-3014 is a nearby cataclysmic variable with an orbital period of approximately 1.76 h at a distance of about 853 light-years from the Earth. Its recently reported X-ray properties suggest that J2056-3014 is an unusual accretion-powered intermediate polar that harbors a fast-spinning white dwarf (WD) with a spin period of 29.6 s. The low X-ray luminosity and the relatively modest accretion rate per unit area suggest that the shock is not occurring near the WD surface. It has been argued that, under these conditions, the maximum temperature of the shock cannot be directly used to determine the mass of the WD (which, under the abovementioned assumptions, would be around 0.46 M-circle dot). Here, we explore the stability of this rapidly rotating WD using a modern equation of state (EoS) that accounts for electron-ion, electron-electron, and ion-ion interactions. For this EoS, we determine the mass density thresholds for the onset of pycnonuclear fusion reactions and study the impact of microscopic stability and rapid rotation on the structure and stability of WDs, considering them with helium, carbon, oxygen, and neon. From this analysis, we obtain a minimum mass for CTCV J2056-3014 of 0.56 M-circle dot and a maximum mass of around 1.38 M-circle dot. If the mass of CTCV J2056-3014 is close to the lower mass limit, its equatorial radius would be on the order of 10(4) km due to rapid rotation. Such a radius is significantly larger than that of a nonrotating WD of average mass (0.6 M-circle dot), which is on the order of 7 x 10(3) km. The effects on the minimum mass of J2056-3014 due to changes in the temperature and composition of the stellar matter were found to be negligibly small. (AU) | |
| FAPESP's process: | 15/15897-1 - Cherenkov Telescope Array - CTA |
| Grantee: | Luiz Vitor de Souza Filho |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/26258-4 - Superdense matter in the universe |
| Grantee: | Manuel Máximo Bastos Malheiro de Oliveira |
| Support Opportunities: | Research Projects - Thematic Grants |