Gravity darkening and tidally perturbed stellar pulsation in the misaligned exoplanet system WASP-33

被引：7
作者：
Kalman, Sz [1 ,2 ,3 ]
Bokon, A. [2 ,4 ,6 ]
Derekas, A. [2 ,5 ,6 ]
Szabo, Gy M. [2 ,5 ,6 ]
Hegedus, V [6 ,7 ]
Nagy, K. [8 ]
机构：
[1] Eotvos Lorand Res Network ELKH, Res Ctr Astron & Earth Sci, Konkoly Observ, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary
[2] MTA ELTE Exoplanet Res Grp, Szent Imre H U 112, H-9700 Szombathely, Hungary
[3] Eotvos Lorand Univ, Doctoral Sch Phys, Peter Setany 1-A, H-1117 Budapest, Hungary
[4] Univ Szeged, Inst Phys, Dept Opt & Quantum Elect, Dom Ter 9, H-6720 Szeged, Hungary
[5] Eotvos Lorand Univ, Gothard Astrophys Observ, Szent Imre H U 112, H-9700 Szombathely, Hungary
[6] MTA ELTE Lendulet Momentum Milky Way Res Grp, Budapest, Hungary
[7] Univ Szeged, Inst Phys, Dom Ter 9, H-6720 Szeged, Hungary
[8] Univ Szeged, Doctoral Sch Phys, Dom Ter 9, H-6720 Szeged, Hungary
来源：
ASTRONOMY & ASTROPHYSICS | 2022年 / 660卷
关键词：
techniques: photometric; planets and satellites: general; stars: variables: delta Scuti; DETACHED BINARY-SYSTEMS; PHOTOMETRIC-OBSERVATIONS; LIGHT CURVES; EXPONENTS; TRANSITS; STAR;
D O I：
10.1051/0004-6361/202243299
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Aims. WASP-33 is one of the few delta Sct stars with a known planetary companion. By analyzing the stellar oscillations, we search for possible star-planet interactions in the pattern of the pulsation. Methods. We made use of the Transit and Light Curve Modeller to solve the light curve from the Transiting Exoplanet Survey Satellite. We include gravity darkening in our analysis. Results. The stellar oscillation pattern of WASP-33 clearly shows signs of several tidally perturbed modes. We find that there are peaks in the frequency spectrum that are at or near the 3rd, 12th, and 25th orbital harmonics ( f(orb) similar to 0.82 d(-1)). Also, there is a prominent overabundance of pulsational frequencies rightward of the orbital harmonics, a characteristic of a tidally perturbed stellar pulsation, which is an outcome of star-planet interactions in the misaligned system. There are peaks in both the delta Sct and gamma Dor ranges of the Fourier spectrum, implying that WASP-33 is a gamma Dor - delta Sct hybrid pulsator. The transit light curves are best fitted by a gravity-darkened stellar model, and the planet parameters are consistent with earlier determinations.
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页数：6
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