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arXiv 2203.09618astro-ph.EPastro-ph.SR
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未对准系外行星系统WASP-33中的重力暗化和潮汐扰动恒星脉动

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

Szilard Kalman, Andras Bokon, Aliz Derekas, Gyula Szabo M., Viola Hegedus, Kristof Nagy

摘要:

WASP-33是为数不多的拥有已知行星伴星的$δ$ Sct恒星之一。通过分析恒星的振荡,我们寻找可能的恒星-行星相互作用的脉动模式。我们利用凌日和光变曲线模型(TLCM)来求解凌日系外行星勘测卫星(TESS)的光变曲线。我们将引力暗化纳入我们的分析。WASP-33的恒星振荡模式清楚地显示出几种潮汐扰动模式的迹象。我们发现在$3$ rd、$12$ th和$25$ th轨道谐波($f_{orb} \sim 0.82$ d $^{-1}$)处或附近的频谱中存在峰。此外,在轨道谐波的右侧有一个明显的过剩的脉动频率,这是潮汐扰动恒星脉动的特征,这是未对准系统中恒星-行星相互作用的结果。在傅立叶光谱的$δ$ Sct和$γ$ Dor范围内都有峰,这意味着WASP-33是$γ$ Dor - $δ$ Sct混合物。凌日光变曲线最适合重力变暗恒星模型,行星参数与早期的测定结果一致。

英文摘要:

WASP-33 is one of the few $δ$ 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. We made use of the Transit and Light Curve Modeller (TLCM) to solve the light curve from the Transiting Exoplanet Survey Satellite (TESS). We include gravity darkening into our analysis. 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 $3$rd, $12$th and $25$th orbital harmonics ($f_{orb} \sim 0.82$ d$^{-1}$). Also, there is a prominent overabundance of pulsational frequencies rightwards of the orbital harmonics, being 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 $δ$ Sct and $γ$ Dor ranges of the Fourier spectrum, implying that WASP-33 is a $γ$ Dor -- $δ$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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