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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

CTCV J2056-3014: An X-Ray-faint Intermediate Polar Harboring an Extremely Fast-spinning White Dwarf

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Author(s):
Lopes de Oliveira, R. [1, 2] ; Bruch, A. [3] ; Rodrigues, V, C. ; Oliveira, A. S. [4] ; Mukai, K. [5, 6]
Total Authors: 5
Affiliation:
[1] Observatorio Nacl, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ - Brazil
[2] Univ Fed Sergipe, Dept Fis, Av Marechal Rondon S-N, BR-49000000 Sao Cristovao, SE - Brazil
[3] Lab Nacl Astrofis, Rua Estados Unidos 154, BR-37504364 Itajuba, MG - Brazil
[4] Univ Vale Paraiba, IP&D, BR-12244000 Sao Jose Dos Campos, SP - Brazil
[5] Univ Maryland, Ctr Space Sci & Technol, 1000 Hilltop Circle, Baltimore, MD 21250 - USA
[6] NASA, Goddard Space Flight Ctr, CRESST & Xray Astrophys Lab 2, Greenbelt, MD 20771 - USA
Total Affiliations: 6
Document type: Journal article
Source: Astrophysical Journal Letters; v. 898, n. 2 AUG 2020.
Web of Science Citations: 0
Abstract

We report on XMM-Newton X-ray observations that reveal CTCV J2056-3014 to be an unusual accretion-powered, intermediate polar (IP) system. It is a member of the class of X-ray-faint IPs whose space density remains unconstrained but potentially very high, withL(x,0.3-12 keV)of 1.8 x 10(31)erg s(-1). We discovered a coherent 29.6 s pulsation in X-rays that was also revealed in our reanalysis of published optical data, showing that the system harbors the fastest-spinning, securely known white dwarf (WD) so far. There is no substantial X-ray absorption in the system. Accretion occurs at a modest rate (similar to 6 x 10(-12)Myr(-1)) in a tall shock above the WD, while the star seems to be spinning in equilibrium and to have low magnetic fields. Further studies of CTCV J2056-3014 potentially have broad implications on the origin of magnetic fields in WDs, on the population and evolution of magnetic cataclysmic variables, and also on the physics of matter around rapidly rotating magnetic WDs. (AU)

FAPESP's process: 13/26258-4 - Superdense matter in the universe
Grantee:Manuel Máximo Bastos Malheiro de Oliveira
Support type: Research Projects - Thematic Grants
FAPESP's process: 17/20309-7 - Search and characterization of new magnetic cataclysmic variables
Grantee:Alexandre Soares de Oliveira
Support type: Regular Research Grants