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Evolution of spin in the intermediate polar CC sculptoris

Paice, John A; Scaringi, S; Castro Segura, N; Sahu, A; Iłkiewicz, K; Coppejans, Deanne L; De Martino, D; Knigge, C; Veresvarska, M

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Dr John Paice
Postdoctoral Research Associate

N Castro Segura

A Sahu

K Iłkiewicz

Deanne L Coppejans

D De Martino

C Knigge


We report on spin variations in the intermediate polar and cataclysmic variable CC Scl, as seen by the Transiting Exoplanet Survey Satellite (TESS). By studying both the spin period and its harmonic, we find that the spin has varied since it was first observed in 2011. We find the latest spin value for the source to be 389.473(6) s, equivalent to 0.00450779(7) d, 0.02 s shorter than the first value measured. A linear fit to these and intermediate data give a rate of change of spin (Ṗ) ∼ −4.26(2.66)× 10−11 and a characteristic time-scale τ ∼ 2.90 × 105 yr, in line with other known intermediate polars with varying spin. The spin profile of this source also matches theoretical spin profiles of high-inclination intermediate polars, and furthermore, appears to have changed in shape over a period of three years. Such ‘spin-up’ in an intermediate polar is considered to be from mass accretion on to the white dwarf (the primary), and we note the presence of dwarf nova eruptions in this source as being a possible catalyst of the variations.


Paice, J. A., Scaringi, S., Castro Segura, N., Sahu, A., Iłkiewicz, K., Coppejans, D. L., …Veresvarska, M. (2024). Evolution of spin in the intermediate polar CC sculptoris. Monthly Notices of the Royal Astronomical Society: Letters, 531(1), L82-L86.

Journal Article Type Article
Acceptance Date Apr 23, 2024
Online Publication Date Apr 27, 2024
Publication Date Mar 29, 2024
Deposit Date Jul 8, 2024
Publicly Available Date Jul 8, 2024
Journal Monthly Notices of the Royal Astronomical Society: Letters
Electronic ISSN 1745-3933
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 531
Issue 1
Pages L82-L86
Public URL


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