On the hierarchical triple nature of the former red nova precursor candidate KIC 9832227

Abstract

We revisit the issue of period variation of the recently claimed red nova precursor candidate KIC 9832227. By using the data gathered during the main mission of the Kepler satellite, those collected by ground-based wide-field surveys and other monitoring programs (such as ASAS-SN), we find that the currently available timing data strongly support a model consisting of the known W UMa binary and a distant low-mass companion with an orbital period of ~13.5 years. The period of the W UMa component exhibits a linear period decrease with a pace of (1.10+/-0.05)x10^{-6} days per year, within the range of many other similar systems. This rate of decrease is several orders of magnitude lower than that of V1309 Sco, the first (and so far the only) well-established binary precursor of a nova observed a few years before the outburst. The high-fidelity fit of the timing data and the conformity of the derived minimum mass of (0.38+/-0.02) Msun of the outer companion from these data with the limit posed by the spectroscopic non-detection of this component, are in agreement with the suggested hierarchical nature of this system.

Submitted to A&A; 11 pages, ~0.6 Mb, after the first favorable referee report

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Cited by in corpus (8)

• New low mass ratio contact binaries in the Catalina Sky Survey
• CoBiToM Project -- I. Contact Binaries Towards Merging
• Runaway Coalescence of Pre-Common-Envelope Stellar Binaries
• Then and now: A new look at the eclipse timing variations of hierarchical triple star candidates in the primordial $Kepler$-field, revisited by TESS
• Period Changes of 14,127 Contact Eclipsing Binaries in the Galactic Bulge
• One of Everything: The Breakthrough Listen Exotica Catalog
• Characteristics of Kepler Eclipsing Binaries Displaying a Significant O'Connell Effect
• A speckle search for the outer companion of KIC 9832227