Mass loss from the exoplanet WASP-12b inferred from Spitzer phase curves

Mass loss from the exoplanet WASP-12b inferred from Spitzer phase curves
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从斯皮策相位曲线推断系外行星 WASP-12b 的质量损失

DOI:
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发表时间:
2019
影响因子:
4.8
通讯作者:
M. Line
M. Line
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
T. Bell;Michael M. Zhang;P. Cubillos;L. Dang;L. Fossati;K. Todorov;N. Cowan;D. Deming;R. Zellem;K. Stevenson;I. Crossfield;I. Dobbs;J. Fortney;H. Knutson;M. Line

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WASP-12b系外行星是新出现的一类超热、木星质量系外行星的原型。过去的模型预测——近紫外线观测也表明——这颗行星正在失去质量。我们对该系统的两组3.6和4.5 $mu m{m}$斯皮策相位曲线观测结果进行了分析,这些观测结果清楚地表明,从行星上剥离的气体产生了红外辐射,并且这些气体似乎直接流向或远离主恒星。这个吸积特征只在4.5美元μ m{m}$处可见,而在3.6美元μ m{m}$处看不到,这表明要么是较长波长的CO发射,要么是来自冷却的、小于600 K的气体的黑体发射。目前还不清楚为什么WASP-12b是唯一一颗表现出这种质量损失特征的超热木星,但也许WASP-12b的轨道正在衰减,就像一些人声称的那样,而其他系外行星的轨道可能更稳定;另外,WASP-12A的高能辐射可能比其他主星更强。我们还发现了在3.6 $mu m{m}$的6.4σ(46.2°)水平上的相位偏移变化的证据。
The exoplanet WASP-12b is the prototype for the emerging class of ultrahot, Jupiter-mass exoplanets. Past models have predicted – and near-ultraviolet observations have shown – that this planet is losing mass. We present an analysis of two sets of 3.6 and 4.5 $mu m{m}$Spitzer phase curve observations of the system which show clear evidence of infrared radiation from gas stripped from the planet, and the gas appears to be flowing directly toward or away from the host star. This accretion signature is only seen at 4.5 $mu m{m}$, not at 3.6 $mu m{m}$, which is indicative either of CO emission at the longer wavelength or blackbody emission from cool, ≲600 K gas. It is unclear why WASP-12b is the only ultrahot Jupiter to exhibit this mass-loss signature, but perhaps WASP-12b’s orbit is decaying as some have claimed, while the orbits of other exoplanets may be more stable; alternatively, the high-energy irradiation from WASP-12A may be stronger than the other host stars. We also find evidence for phase offset variability at the level of 6.4σ (46.2°) at 3.6 $mu m{m}$.
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发表时间: 2014
期刊: The Astrophysical Journal
影响因子: --
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DOI: 10.1088/0004-637x/727/2/125
发表时间: 2011
期刊: The Astrophysical Journal
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DOI: 10.1093/mnras/stt1725
发表时间: 2013
影响因子: 4.8
作者:
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通讯作者: Llama J