Validation of the frequency modulation technique applied to the pulsating δ Sct–γ Dor eclipsing binary star KIC 8569819
Article
Article Title | Validation of the frequency modulation technique applied to the pulsating δ Sct–γ Dor eclipsing binary star KIC 8569819 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Kurtz, Donald W. (Author), Hambleton, Kelly M. (Author), Shibahashi, Hiromoto (Author), Murphy, Simon J. (Author) and Prsa, Andrej (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 446 (2), pp. 1223-1233 |
Number of Pages | 11 |
Year | 2014 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stu2075 |
Web Address (URL) | https://academic.oup.com/mnras/article/446/2/1223/2891893 |
Abstract | KIC 8569819 is an eclipsing binary star with an early F primary and G secondary in a 20.85-d eccentric orbit. The primary is a δ Sct–γ Dor star pulsating in both p modes and g modes. Using four years of Kepler Mission photometric data, we independently model the light curve using the traditional technique with the modelling code PHOEBE, and we study the orbital characteristics using the new frequency modulation technique. We show that both methods provide the equivalent orbital period, eccentricity and argument of periastron, thus illustrating and validating the FM technique. In the amplitude spectrum of the p-mode pulsations, we also discovered an FM signal compatible with a third body in the system, a low-mass M dwarf in an 861-d orbit around the primary pair. However, the eclipses show no timing variations, indicating that the FM signal is a consequence of the intrinsic change in pulsation frequency, thus providing a cautionary tale. Our analysis shows the potential of the FM technique using Kepler data, and we discuss the prospects to detect planets and brown dwarfs in Kepler data for A and F stars even in the absence of transits and with no spectroscopic radial velocity curves. This opens the possibility of finding planets orbiting hotter stars that cannot be found by traditional techniques. |
Keywords | Stars: individual: KIC 8569819; Stars: oscillations; Stars: variables: δ Scuti; Techniques: radial velocities; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Central Lancashire, United Kingdom |
University of Tokyo, Japan | |
Villanova University, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q738z/validation-of-the-frequency-modulation-technique-applied-to-the-pulsating-sct-dor-eclipsing-binary-star-kic-8569819
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