Polarization of hot Jupiter systems: a likely detection of stellar activity and a possible detection of planetary polarization
Polarization of hot Jupiter systems: a likely detection of stellar activity and a possible detection of planetary polarization
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DOI：
10.1093/mnras/stab172
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发表时间：
2021-01
期刊：
影响因子：
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通讯作者：
J. Bailey;K. Bott;D. Cotton;L. Kedziora-Chudczer;Jinglin Zhao;D. Evensberget;J. Marshall;D. Wright
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文献类型：
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作者：
J. Bailey;K. Bott;D. Cotton;L. Kedziora-Chudczer;Jinglin Zhao;D. Evensberget;J. Marshall;D. Wright
我们提供了四个明亮的热木星系统(τBoo，HD 179949，HD 189733和51Peg)的高精度线偏振观测，并使用这些数据来搜索来自行星的偏振反射光。51Peg的数据与反射光偏振信号在大约2.8Peg的预期水平上是一致的，虚警概率为1.9%。σ的重要性为2.8peg。将需要更多的数据来确认在该系统中检测到反射光。HD 189733显示了高度可变的偏振，这似乎最有可能是主星磁活动的结果。这掩盖了由于反射光引起的任何偏振，但不能排除预期水平为20ppm的∼的偏振信号。τBOO和HD 179949没有显示由于反射光而产生偏振的证据。这一结果与许多热木星具有低几何反照率的观点是一致的。对来自热木星的偏振反射光的确凿探测可能需要进一步提高仪器灵敏度。
We present high-precision linear polarization observations of four bright hot Jupiter systems (τ Boo, HD 179949, HD 189733, and 51 Peg) and use the data to search for polarized reflected light from the planets. The data for 51 Peg are consistent with a reflected light polarization signal at about the level expected with 2.8σ significance and a false alarm probability of 1.9 per cent. More data will be needed to confirm a detection of reflected light in this system. HD 189733 shows highly variable polarization that appears to be most likely the result of magnetic activity of the host star. This masks any polarization due to reflected light, but a polarization signal at the expected level of ∼20 ppm cannot be ruled out. τ Boo and HD 179949 show no evidence for polarization due to reflected light. The results are consistent with the idea that many hot Jupiters have low geometric albedos. Conclusive detection of polarized reflected light from hot Jupiters is likely to require further improvements in instrument sensitivity.