论文标题
五个热木星的苔丝反照率的限制
Constraints on TESS albedos for five hot Jupiters
论文作者
论文摘要
传播系外星球的掩星的光度观察可以对其大气的热发射和反照率施加重要的约束。我们分析了光度测量结果，并得出了几何反照率（$ a_ \ mathrm {g} $）的约束，用于在光学中观察到的五个热木星：wasp-18 b，wasp-36 b，wasp-36 b，wasp-43 b，wasp-43 b，wasp-50 b，wasp-50 b和wasp-51 b。对于WASP-43 B，我们的结果通过$ 2.09〜μ $ m的近红外观察VLT/Hawk-I观察得到补充。我们得出WASP-50 B和WASP-51 B的第一个几何反照率约束：$ A_ \ Mathrm {G} <0.445 $和$ A_ \ Mathrm {G} <0.368 $。我们发现WASP-43 B和WASP-18 B都与低几何反照率（$ A_ \ Mathrm {g} <0.16 $）一致，即使它们位于热木星温度范围的相对端，平衡温度分别为$ \ sim1400 $ k和$ \ sim2500 $K。我们报告了自洽的大气模型，这些模型解释了苔丝，\ hst，\ spitzer和VLT/Hawk-i的行星的宽带观测。我们发现，两个热木星的数据可以通过热排放和效率低下的昼夜能量再分配来解释。数据不需要来自云/危险的光学散射，与观察到的低几何反照率一致。
Photometric observations of occultations of transiting exoplanets can place important constraints on the thermal emission and albedos of their atmospheres. We analyse photometric measurements and derive geometric albedo ($A_\mathrm{g}$) constraints for five hot Jupiters observed with TESS in the optical: WASP-18 b, WASP-36 b, WASP-43 b, WASP-50 b and WASP-51 b. For WASP-43 b, our results are complemented by a VLT/HAWK-I observation in the near-infrared at $2.09~μ$m. We derive the first geometric albedo constraints for WASP-50 b and WASP-51 b: $A_\mathrm{g}<0.445$ and $A_\mathrm{g}<0.368$, respectively. We find that WASP-43 b and WASP-18 b are both consistent with low geometric albedos ($A_\mathrm{g}<0.16$) even though they lie at opposite ends of the hot Jupiter temperature range with equilibrium temperatures of $\sim1400$ K and $\sim2500$ K, respectively. We report self-consistent atmospheric models which explain broadband observations for both planets from TESS, \HST, \Spitzer and VLT/HAWK-I. We find that the data of both hot Jupiters can be explained by thermal emission alone and inefficient day-night energy redistribution. The data do not require optical scattering from clouds/hazes, consistent with the low geometric albedos observed.
