KIC 3749404: a heartbeat star with rapid apsidal advance indicative of a tertiary component
Article
Article Title | KIC 3749404: a heartbeat star with rapid apsidal advance indicative of a tertiary component |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Hambleton, K. (Author), Kurtz, D. W. (Author), Prsa, A. (Author), Quinn, S. N. (Author), Fuller, J. (Author), Murphy, S. J. (Author), Thompson, S. E. (Author), Latham, D. W. (Author) and Shporer, A. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 463 (2), pp. 1199-1212 |
Number of Pages | 14 |
Year | 2016 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stw1970 |
Web Address (URL) | https://academic.oup.com/mnras/article/463/2/1199/2892176 |
Abstract | Heartbeat stars are eccentric (e > 0.2) ellipsoidal variables whose light curves resemble a cardiogram. We present the observations and corresponding model of KIC 3749404, a highly eccentric (e = 0.66), short period (P = 20.3 d) heartbeat star with tidally induced pulsations. A binary star model was created using PHOEBE, which we modified to include tidally induced pulsations and Doppler boosting. The morphology of the photometric periastron variation (heartbeat) depends strongly on the eccentricity, inclination and argument of periastron. We show that the inclusion of tidally induced pulsations in the model significantly changes the parameter values, specifically the inclination and those parameters dependent on it. Furthermore, we determine the rate of apsidal advance by modelling the periastron variation at the beginning and end of the 4-yr Kepler data set and dividing by the elapsed time. We compare the model with the theoretical expectations for classical and general relativistic apsidal motion and find the observed rate to be two orders of magnitude greater than the theoretical rate. We find that the observed rate cannot be explained by tidally induced pulsations alone and consequently hypothesize the presence of a third body in the system. |
Keywords | Binaries: eclipsing; Stars: individual: KIC 3749404; Stars: oscillations; 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 ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Villanova University, United States |
University of Central Lancashire, United Kingdom | |
Georgia State University, United States | |
California Institute of Technology (Caltech), United States | |
Aarhus University, Denmark | |
NASA Ames Research Center, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7382/kic-3749404-a-heartbeat-star-with-rapid-apsidal-advance-indicative-of-a-tertiary-component
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