Automated Extended Aperture Photometry of K2 variable stars
Abstract
Proper photometric data are challenging to obtain in the K2 mission of the Kepler space telescope due to strong systematics caused by the two-wheel-mode operation. It is especially true for variable stars wherein physical phenomena occur on timescales similar to the instrumental signals. We originally developed a method with the aim to extend the photometric aperture to be able to compensate the motion of the telescope which we named Extended Aperture Photometry (EAP). Here we present the outline of the automatized version of the EAP method, an open-source pipeline called autoEAP. We compare the light curve products to other photometric solutions for examples chosen from high-amplitude variable stars. Besides the photometry, we developed a new detrending method, which is based on phase dispersion minimization and is able to eliminate long-term instrumental signals for periodic variable stars.
Keywords
Cite
@article{arxiv.2112.07496,
title = {Automated Extended Aperture Photometry of K2 variable stars},
author = {Attila Bódi and Pál Szabó and Emese Plachy and László Molnár and Róbert Szabó},
journal= {arXiv preprint arXiv:2112.07496},
year = {2022}
}
Comments
15 pages, 12 figures. Accepted for publication in PASP. Code available on GitHub: https://github.com/konkolyseismolab/autoeap. Light curve data available: https://konkoly.hu/KIK/data_en.html