Astronomy and Astrophysics; Space and Planetary Science
Abstract :
[en] KIC 6362386 is an eclipsing binary system that exhibits both γ Doradus (γ Dor)-type pulsations and starspots. In this study, we investigated this binary system using the Kepler photometry and the spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope. After employing the PHOEBE program for light-curve and radial-velocity-curve synthesis, analyses reveal that the binary is a circle (e ∼ 0.0006), has a small mass ratio (q ∼ 0.311), and is a detached system consisting of an F-type primary star and an M-type secondary star with masses and radii of M 1 = 1.43 ± 0.13 M ⊙, R 1 = 1.68 ± 0.08 R ⊙ and M 2 = 0.44 ± 0.18 M ⊙, R 2 = 0.46 ± 0.06 R ⊙, respectively. Utilizing the Padova isochrone, we estimate the age of the binary system to be 1.58 − 0.13 + 0.15 Gyr. By analyzing the out-of-eclipse residuals, we identify variations in the residuals attributed to both starspots and stellar pulsations. The autocorrelation function analysis indicates the decay time of starspots is approximately 37 days with the rotation period aligning with the orbital period. Considering the masses, radii, and positions of the two components on the Hertzsprung-Russell diagram, we deduce that the γ Dor-type g-mode pulsations came from the primary star where the main frequency is 0.1642c/d. Consequently, KIC 6362386 becomes a valuable target for the investigation of γ Dor-type pulsations and asteroseismology in a binary system.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Jin, Mengqi; Department of Astronomy, Beijing Normal University, Beijing, China ; Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing, China
Fu, Jianning ; Department of Astronomy, Beijing Normal University, Beijing, China ; Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing, China
Zhang, Xiaobin ; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
Zong, Weikai ; Department of Astronomy, Beijing Normal University, Beijing, China ; Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing, China
Wang, Jiaxin ; School of Science, Chongqing University of Posts and Telecommunications, Chongqing, China
Ma, Xiaoyu ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR) ; Department of Astronomy, Beijing Normal University, Beijing, China
Xing, Keyu ; Department of Astronomy, Beijing Normal University, Beijing, China
Wang, Haotian; Department of Astronomy, Beijing Normal University, Beijing, China
Language :
English
Title :
KIC 6362386: An Eclipsing Binary with γ Doradus-type Pulsations and Starspots
J.N.F. acknowledges the support from the National Natural Science Foundation of China (NSFC) through the grants 12090040 and 12090042, and the science research grants from the China Manned Space Project. This research made use of Lightkurve, a Python package for Kepler and TESS data analysis (Lightkurve Collaboration 2018). Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope LAMOST) is a National Major Scientific Project built by the Chinese Academy of Sciences. Funding for the project has been provided by the National Development and Reform Commission. LAMOST is operated and managed by the National Astronomical Observatories, Chinese Academy of Sciences. All of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST) at the Space Telescope Science Institute. The specific observations analyzed can be accessed via doi:10.17909/3aqh-ah32. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS526555. Support to MAST for these data is provided by the NASA Office of Space Science via grant NAG57584 and by other grants and contracts.J.N.F. acknowledges the support from the National Natural Science Foundation of China (NSFC) through the grants 12090040 and 12090042, and the science research grants from the China Manned Space Project. This research made use of Lightkurve, a Python package for Kepler and TESS data analysis (Lightkurve Collaboration ). Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope LAMOST) is a National Major Scientific Project built by the Chinese Academy of Sciences. Funding for the project has been provided by the National Development and Reform Commission. LAMOST is operated and managed by the National Astronomical Observatories, Chinese Academy of Sciences. All of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST) at the Space Telescope Science Institute. The specific observations analyzed can be accessed via doi: 10.17909/3aqh-ah32 . STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS526555. Support to MAST for these data is provided by the NASA Office of Space Science via grant NAG57584 and by other grants and contracts.
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