TESS observations of the asynchronous polar CD Ind: mapping the changing accretion geometry
Abstract
We present the results of near continuous TESS optical observations of the asynchronous polar CD Ind (RX J2115-5840). The 27.9 d long light curve, with 2 min resolution, reveals remarkable changes in the magnetic accretion geometry of the system over the 7.3 d beat period. We have modelled the changes in the optical spin period pulse shape using a cyclotron emission mapping technique. The resulting cyclotron emission maps of the magnetic white dwarf reveal how the accretion geometry changes from single to two pole accretion and back over the beat cycle. Finally, we present the results from particle based numerical magnetic accretion simulations, that agree with our interpretation of the changing accretion scenario.
Cite
@article{arxiv.1904.02949,
title = {TESS observations of the asynchronous polar CD Ind: mapping the changing accretion geometry},
author = {Pasi Hakala and Gavin Ramsay and Stephen B. Potter and Andrew Beardmore and David A. H. Buckley and Graham Wynn},
journal= {arXiv preprint arXiv:1904.02949},
year = {2019}
}
Comments
Accepted for publication in MNRAS on 4th Apr 2019, originally submitted 28th Feb 2019. 8 pages, 6 figures. See also a preprint by Littlefield et al. (1903.00490) that uses the same dataset