论文标题
热木星黄蜂12b的衰减轨道：带有苔丝观察的确认
Decaying Orbit of the Hot Jupiter WASP-12b: Confirmation with TESS Observations
论文作者
论文摘要
理论表明，由于与宿主星星的潮汐相互作用，某些近距离行星的轨道应腐烂。迄今为止，WASP-12B是据报道的唯一具有腐烂轨道的热木星，速率为29 $ \ pm $ 2毫秒$^YEAM $^{ - 1} $。我们分析了NASA过境系外行星调查卫星（TESS）的数据，以验证WASP-12B的轨道确实在发生变化。我们发现，苔丝的过境和掩盖数据与衰减轨道一致，更新的周期为1.091420090 $ \ pm $ 0.000000041天，衰减率为32.53 $ \ pm $ 1.62 msec年$^$^{ - 1} $。我们发现$τ$ = p/$ | \ dot p | $ = 2.90 $ \ pm $ 0.14 MYR的轨道衰减时间尺度。如果观察到的衰减是潮汐消散的结果，则修改的潮汐质量因子为q'$ _ {\ star} $ = 1.39 $ \ pm $ 0.15 $ \ times 10^{5} $，它落在二进制恒星系统和热木星的值下的下端。我们的结果突出了用于研究短期外球星的轨道演化的空间光度法的力量。
Theory suggests that the orbits of some close-in giant planets should decay due to tidal interactions with their host stars. To date, WASP-12b is the only hot Jupiter reported to have a decaying orbit, at a rate of 29$\pm$2 msec year$^{-1}$. We analyzed data from NASA's Transiting Exoplanet Survey Satellite (TESS) to verify that WASP-12b's orbit is indeed changing. We find that the TESS transit and occultation data are consistent with a decaying orbit with an updated period of 1.091420090$\pm$0.000000041 days and a decay rate of 32.53$\pm$1.62 msec year$^{-1}$. We find an orbital decay timescale of $τ$ = P/$|\dot P|$ = 2.90$\pm$0.14 Myr. If the observed decay results from tidal dissipation, the modified tidal quality factor is Q'$_{\star}$ = 1.39$\pm$0.15 $\times 10^{5}$, which falls at the lower end of values derived for binary star systems and hot Jupiters. Our result highlights the power of space-based photometry for investigating the orbital evolution of short-period exoplanets.
