Comment on Ádám et al. (2023): Large fraction of already known systems reported

Charles University, Faculty of Mathematics and Physics, Astronomical Institute, V Holešovičkách 2, 180 00 Praha 8, Czech Republic
e-mail: zasche@sirrah.troja.mff.cuni.cz

Received: 22 April 2024
Accepted: 2 June 2024

Abstract

In this work, I report that large fraction of stars detected by Ádám et al. (2023, A&A, 674, A170) and noted in that work as new discoveries are in fact known systems. This is especially true for the dense bulge fields with large blending of nearby sources. Among the published 245 stars determined to be doubly eclipsing (i.e. containing two eclipsing signals), I identified 53 blends. In other words, about a quarter of the systems noted by Ádám et al. (2023, A&A, 674, A170) are not actually doubly eclipsing; rather, these are contaminations of known nearby sources that have already been detected by OGLE. Such a high proportion of reported false positives should not be readily ignored and ought to be addressed in future studies.