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Tidally Induced Pulsations in Kepler Eclipsing Binary KIC 3230227

Guo, Zhao and Gies, Douglas R. and Fuller, Jim (2017) Tidally Induced Pulsations in Kepler Eclipsing Binary KIC 3230227. Astrophysical Journal, 834 (1). Art. No. 59. ISSN 0004-637X. doi:10.3847/1538-4357/834/1/59.

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KIC 3230227 is a short period (P ≈ 7.0 days) eclipsing binary with a very eccentric orbit (e = 0.6). From combined analysis of radial velocities and Kepler light curves, this system is found to be composed of two A-type stars, with masses of M_1 = 1.84 ± 0.18 M_⊙, M_2 = 1.73 ± 0.17 M_⊙ and radii of R_1 = 2.01 ± 0.09 R_⊙, R_2 = 1.68 ± 0.08 R_⊙ for the primary and secondary, respectively. In addition to an eclipse, the binary light curve shows a brightening and dimming near periastron, making this a somewhat rare eclipsing heartbeat star system. After removing the binary light curve model, more than 10 pulsational frequencies are present in the Fourier spectrum of the residuals, and most of them are integer multiples of the orbital frequency. These pulsations are tidally driven, and both the amplitudes and phases are in agreement with predictions from linear tidal theory for l = 2, m = −2 prograde modes.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Guo, Zhao0000-0002-0951-2171
Fuller, Jim0000-0002-4544-0750
Additional Information:© 2016. The American Astronomical Society. Received 2016 September 20; revised 2016 November 2; accepted 2016 November 8; published 2016 December 30. We thank the anonymous referee for helpful comments and suggestions which improved the quality of this paper. We thank Jerome A. Orosz for making his ELC code available to us. We thank Bill Paxton, Rich Townsend, and others for maintaining and updating MESA and GYRE. GZ is grateful to Joshua Burkart for explaining tidal asteroseismology and Rachel Smullen for her help in clarifying some issues in the analysis of radial velocities. We thank Kelly Hambleton for useful discussions. This work is partly based on data from the Kepler mission. Kepler was competitively selected as the tenth Discovery mission. Funding for this mission is provided by NASA's Science Mission Directorate. The photometric data were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. This study was supported by NASA grants NNX12AC81G, NNX13AC21G, and NNX13AC20G. This material is based upon work supported by the National Science Foundation under Grant No. AST-1411654. Institutional support has been provided from the GSU College of Arts and Sciences and the Research Program Enhancement fund of the Board of Regents of the University System of Georgia, administered through the GSU Office of the Vice President for Research and Economic Development.
Group:TAPIR, Walter Burke Institute for Theoretical Physics, Astronomy Department
Funding AgencyGrant Number
Georgia State UniversityUNSPECIFIED
Board of Regents of the University System of GeorgiaUNSPECIFIED
Subject Keywords: binaries: eclipsing; binaries: spectroscopic; stars: individual (KIC 3230227) ; stars: variables: general
Issue or Number:1
Record Number:CaltechAUTHORS:20170104-142038437
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Official Citation:Zhao Guo et al 2017 ApJ 834 59
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73220
Deposited By: George Porter
Deposited On:04 Jan 2017 22:36
Last Modified:11 Nov 2021 05:13

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