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arXiv 2005.11293astro-ph.EP
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HST PanCET程序:HAT-P-32 Ab的光学至红外透射光谱

The HST PanCET Program: An Optical to Infrared Transmission Spectrum of HAT-P-32Ab

Munazza K. Alam, Mercedes Lopez-Morales, Nikolay Nikolov, David K. Sing, Gregory W. Henry, Claire Baxter, Jean-Michel Desert, Joanna K. Barstow, Thomas Mikal-Ev… 展开作者

Munazza K. Alam, Mercedes Lopez-Morales, Nikolay Nikolov, David K. Sing, Gregory W. Henry, Claire Baxter, Jean-Michel Desert, Joanna K. Barstow, Thomas Mikal-Evans, Vincent Bourrier, Panayotis Lavvas, Hannah R. Wakeford, Michael H. Williamson, Jorge Sanz-Forcada, Lars A. Buchhave, Ofer Cohen, Antonio Garcia Munoz

摘要:

我们提出了一个0.3-5微米的热木星HAT-P-32Ab的透射光谱观测与空间望远镜成像光谱仪(STIS)和宽视场相机3(WFC 3)仪器安装在哈勃太空望远镜,结合斯皮策红外阵列相机(IRAC)测光。光谱由51个分光光度箱组成,宽度范围在150到400 nm之间,测量的中位精度为215 ppm。所观察到的透射光谱的一维辐射对流平衡模型的网格的比较表明云/霾的存在,与以前的过境观测和二次日食测量一致。为了提供更强大的约束行星的大气特性,我们执行的第一个完整的光学红外检索分析这颗行星。检索的光谱是一致的肢体温度为1248 $\pm$ 92 K,厚的云甲板,增强瑞利散射,和$\sim$ 10倍太阳H2O丰度。我们发现log($Z/Z_{\odot}$)= 2.41 $_{-0.07}^{+0.06}$,与太阳系的质量-金属丰度关系一致。

英文摘要:

We present a 0.3-5 micron transmission spectrum of the hot Jupiter HAT-P-32Ab observed with the Space Telescope Imaging Spectrograph (STIS) and Wide Field Camera 3 (WFC3) instruments mounted on the Hubble Space Telescope, combined with Spitzer Infrared Array Camera (IRAC) photometry. The spectrum is composed of 51 spectrophotometric bins with widths ranging between 150 and 400 Å, measured to a median precision of 215 ppm. Comparisons of the observed transmission spectrum to a grid of 1D radiative-convective equilibrium models indicate the presence of clouds/hazes, consistent with previous transit observations and secondary eclipse measurements. To provide more robust constraints on the planet's atmospheric properties, we perform the first full optical to infrared retrieval analysis for this planet. The retrieved spectrum is consistent with a limb temperature of 1248$\pm$92 K, a thick cloud deck, enhanced Rayleigh scattering, and $\sim$10x solar H2O abundance. We find log($Z/Z_{\odot}$) = 2.41$_{-0.07}^{+0.06}$, in agreement with the mass-metallicity relation derived for the Solar System.

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