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KIC 9533489: a genuine γ Doradus – δ Scuti Kepler hybrid pulsator with transit events

Bognár, Zs. and Lampens, P. and Frémat, Y. and Southworth, J. and Sódor, Á. and De Cat, P. and Isaacson, H. T. and Marcy, G. W. and Ciardi, D. R. and Gilliland, R. L. and Martín-Fernández, P. (2015) KIC 9533489: a genuine γ Doradus – δ Scuti Kepler hybrid pulsator with transit events. Astronomy and Astrophysics, 581 . Art. No. A77. ISSN 0004-6361.

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Context. Several hundred candidate hybrid pulsators of type A–F have been identified from space-based observations. Their large number allows both statistical analyses and detailed investigations of individual stars. This offers the opportunity to study the full interior of the genuine hybrids, in which both low radial order p- and high-order g-modes are self-excited at the same time. However, a few other physical processes can also be responsible for the observed hybrid nature, related to binarity or to surface inhomogeneities. The finding that most δ Scuti stars also show long-period light variations represents a real challenge for theory. Aims. We aim at determining the pulsation frequencies of KIC 9533489, to search for regular patterns and spacings among them, and to investigate the stability of the frequencies and the amplitudes. An additional goal is to study the serendipitously detected transit events: is KIC 9533489 the host star? What are the limitations on the physical parameters of the involved bodies? Methods. We performed a Fourier analysis of all the available Kepler light curves. We investigated the frequency and period spacings and determined the stellar physical parameters from spectroscopic observations. We also modelled the transit events. Results. The Fourier analysis of the Kepler light curves revealed 55 significant frequencies clustered into two groups, which are separated by a gap between 15 and 27 d^(1). The light variations are dominated by the beating of two dominant frequencies located at around 4 d^(-1). The amplitudes of these two frequencies show a monotonic long-term trend. The frequency spacing analysis revealed two possibilities: the pulsator is either a highly inclined moderate rotator (v ≈ 70 km s^(-1), i> 70°) or a fast rotator (v ≈ 200 km s^(-1)) with i ≈ 20°. The transit analysis disclosed that the transit events that occur with a ≈197 d period may be caused by a 1.6 R_(Jup) body orbiting a fainter star, which would be spatially coincident with KIC 9533489.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Isaacson, H. T.0000-0002-0531-1073
Marcy, G. W.0000-0002-2909-0113
Ciardi, D. R.0000-0002-5741-3047
Gilliland, R. L.0000-0002-1554-5578
Alternate Title:KIC 9533489: a genuine gamma Doradus-delta Scuti Kepler hybrid pulsator with transit events
Additional Information:© 2015 ESO. Article published by EDP Sciences. Received 22 March 2015; Accepted 4 June 2015; Published online 07 September 2015. The authors thank the anonymous referee for the constructive comments and recommendations on the manuscript. Zs.B. acknowledges the support of the Hungarian Eötvös Fellowship (2013), the kind hospitality of the Royal Observatory of Belgium as a temporary voluntary researcher (2013–2014), and, together with Á.S., the support of the ESA PECS project 4000103541/11/NL/KML. Á.S. acknowledges support by the Belgian Federal Science Policy (project M0/33/029, PI: P.D.C.) and by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences. P.M.F. acknowledges support from MICINN of Spain via grants BES-2012-053246 and AYA2011-24728, and from the “Junta de Andalucía” through the FQM-108 project. Funding for the Kepler mission is provided by the NASA Science Mission directorate. We thank the Kepler team for the high-quality data obtained by this outstanding mission. We are very grateful to Jorge Jiménez Vicente (Universidad de Granada, Spain) and Evencio Mediavilla (Instituto de Astrofísica de Canarias) for kindly providing a spectrum with the INTEGRAL optical fiber system. Based on spectra obtained with the HERMES spectrograph installed at the Mercator Telescope, operated by the Flemish Community, with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association, and with the William Herschel Telescope, operated by the Isaac Newton Group of Telescopes. All instruments are located at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors thank Simon Murphy for his useful comments on the first version of this manuscript.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Hungarian Eötvös FellowshipUNSPECIFIED
European Space Agency (ESA)4000103541/11/NL/KML
Belgian Federal Science Policy Office (BELSPO)M0/33/029
Hungarian Scientific Research Fund (OTKA)UNSPECIFIED
Ministerio de Economía y Competitividad (MICINN)BES-2012-053246
Ministerio de Economía y Competitividad (MICINN)AYA2011-24728
Ministerio de Economía y Competitividad (MICINN)FQM-108
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:techniques: photometric – stars: individual: KIC 9533489 – stars: variables: delta Scuti – planets and satellites: detection – stars: oscillations
Record Number:CaltechAUTHORS:20151030-154101932
Persistent URL:
Official Citation:KIC 9533489: a genuine γ Doradus – δ Scuti Kepler hybrid pulsator with transit events Zs. Bognár, P. Lampens, Y. Frémat, J. Southworth, Á. Sódor, P. De Cat, H. T. Isaacson, G. W. Marcy, D. R. Ciardi, R. L. GillilandZs. Bognár, P. Lampens, Y. Frémat, J. Southworth, Á. Sódor, P. De Cat, H. T. Isaacson, G. W. Marcy, D. R. Ciardi, R. L. Gilliland and P. Martín-Fernández A&A, 581 (2015) A77 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61755
Deposited By: Tony Diaz
Deposited On:02 Nov 2015 21:30
Last Modified:22 Sep 2017 22:31

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