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arXiv 2103.15833astro-ph.EP
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斯皮策二级火箭的发展趋势

Trends in Spitzer Secondary Eclipses

Nicole L. Wallack, Heather A. Knutson, Drake Deming

摘要:

众所周知,入射恒星通量的大小是决定短周期气体巨行星昼夜温度梯度和大气化学的最重要因素。然而,其他因素,如行星与行星之间的大气金属含量变化,C/O比和云的性质,也可能有助于观察到这群行星的红外光谱的多样性。在这项研究中,我们提出了新的3.6和4.5微米的二次日食测量五个过境气体巨行星:HAT-P-5 b,HAT-P-38 b,WASP-7 b,WASP-72 b和WASP-127 b。我们检测日食在至少一个带通的所有五个行星,并确认圆形轨道的所有行星,除了WASP-7 b,这表明一个非零偏心率的证据。在Garhart et al.(2020)的工作基础上,我们将这些新行星置于更广泛的背景下,将它们与所有测量到斯皮策二级日食的行星样本进行比较。我们发现入射通量是决定短周期气体巨行星大气化学和环流模式的唯一最重要的因素。虽然我们也可能期望表面重力和宿主恒星金属丰度发挥次要作用,但我们没有发现与这两个变量中任何一个相关的证据。

英文摘要:

It is well-established that the magnitude of the incident stellar flux is the single most important factor in determining the day-night temperature gradients and atmospheric chemistries of short-period gas giant planets. However it is likely that other factors, such as planet-to-planet variations in atmospheric metallicity, C/O ratio, and cloud properties, also contribute to the observed diversity of infrared spectra for this population of planets. In this study we present new 3.6 and 4.5 micron secondary eclipse measurements for five transiting gas giant planets: HAT-P-5b, HAT-P-38b, WASP-7b, WASP-72b, and WASP-127b. We detect eclipses in at least one bandpass for all five planets and confirm circular orbits for all planets except for WASP-7b, which shows evidence for a non-zero eccentricity. Building on the work of Garhart et al. (2020), we place these new planets into a broader context by comparing them with the sample of all planets with measured Spitzer secondary eclipses. We find that incident flux is the single most important factor for determining the atmospheric chemistry and circulation patterns of short-period gas giant planets. Although we might also expect surface gravity and host star metallicity to play a secondary role, we find no evidence for correlations with either of these two variables.

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