A Few Years Later: Revisiting Period Variations of Eclipsing Binaries in the Northern Continuous Viewing Zone of TESS
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universe-12-00107.pdf
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Author(s)
Borkovits, Tamás
Mitnyan, Tibor
Czavalinga, Donát R.
Rappaport, Saul A.
Date Issued
April 3, 2026
Journal
Universe
Publisher
MDPI
Citation
Borkovits, T.; Mitnyan, T.; Czavalinga, D.R.; Rappaport, S.A. A Few Years Later: Revisiting Period Variations of Eclipsing Binaries in the Northern Continuous Viewing Zone of TESS. Universe 2026, 12, 107.
Version
Final published version
Abstract
In our previous analysis of the eclipse timing variation patterns of eclipsing binaries located
in and near the Northern Continuous Viewing Zone (NCVZ) of the TESS space telescope,
135 hierarchical triple star candidates were found. Now, two additional years of TESS
observations are available and, hence, we have extended the former analysis with the use
of the new observational data. We now detect 168 triple star candidates in the updated
and reanalyzed sample. The majority (∼74%) of them are identical to the former triples
candidates. For many of them, our new solutions are more certain than the original ones.
Therefore, we can now conclude that we have identified at least 66 short-period hierarchical
triple stellar systems in the NCVZ with full confidence. In the case of the majority of the
remaining systems in our sample, the presence of a close third stellar component appears to
be very likely. We also identify additional, longer timescale period variations in 34 systems
(20% of the total sample) and conclude that in at least three systems the presence of a fourth
stellar component is quite plausible. Finally, we report the complete disappearance of
the eclipses in two former EBs and detect eclipse depth variations in seven other EBs as
well. We interpret this effect as the consequence of changing orbital inclination caused by a
non-coplanar third body.
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DOI of Published Version
https://doi.org/10.3390/universe12040107
