arXiv 2004.000142020-04astro-ph.EP

热木星Qatar-1b斯皮策相位曲线中比预期的亮点偏移小

Smaller than expected bright-spot offsets in Spitzer phase curves of the hot Jupiter Qatar-1b

Dylan Keating, Kevin B. Stevenson, Nicolas B. Cowan, Emily Rauscher, Jacob L. Bean, Taylor Bell, Lisa Dang, Drake Deming, Jean-Michel Désert, Y. Katherina Feng,… 展开作者

Dylan Keating, Kevin B. Stevenson, Nicolas B. Cowan, Emily Rauscher, Jacob L. Bean, Taylor Bell, Lisa Dang, Drake Deming, Jean-Michel Désert, Y. Katherina Feng, Jonathan J. Fortney, Tiffany Kataria, Eliza M. -R. Kempton, Nikole Lewis, Michael R. Line, Megan Mansfield, Erin May, Caroline Morley, Adam P. Showman

备注：: 14 pages, 8 figures. Accepted for publication in AJ
DOI：: 10.3847/1538-3881/ab83f4

阅读 PDF

arXiv 页面 ↗HTML 原文 ↗

摘要：

我们提出了热木星卡塔尔-1b的\textit{Spitzer}全轨道热相位曲线，这是一颗具有相同平衡温度的行星-以及中间表面重力和轨道周期-作为研究良好的行星HD 209458 b和WASP-43 b。我们测量二次日食的$0.21 \pm 0.02 \%$在$3.6~μ$ m和$0.30 \pm 0.02 \%$在$4.5~μ$ m，对应的昼侧亮度温度$1542^{+32}_{-31}$ ~K和$1557^{+35}_{-36}$ ~K，分别与垂直等温昼侧。它们的夜面亮温分别为$1117^{+76}_{-71}$ ~K和$1167^{+69}_{-74}$ ~K，这与热彗星的夜面温度相近的趋势一致。我们推断债券债券的$0.12_{-0.16}^{+0.14}$和温和的昼夜热再循环效率，类似于HD 209458 b。HD 209458 b和WASP-43 b的大气环流模型预测，它们的亮斑应该向东移动数十度，这些预测先前已被\textit{Spitzer}全轨道相位曲线观测所证实。Qatar-1b的相位曲线预计也会向东偏移。相反，观察到的相位曲线与无偏移一致：$3.6~μ$ m处的$11^{\circ}\pm 7^{\circ}$和$4.5~μ$ m处的$-4^{\circ}\pm 7^{\circ}$。这三颗行星在其他方面相似的环流模式之间的差异指出了次要参数的重要性，如旋转速率和表面重力，以及云的存在或不存在，在确定热彗星上的大气条件。

英文摘要：

We present \textit{Spitzer} full-orbit thermal phase curves of the hot Jupiter Qatar-1b, a planet with the same equilibrium temperature---and intermediate surface gravity and orbital period---as the well-studied planets HD 209458b and WASP-43b. We measure secondary eclipse of $0.21 \pm 0.02 \%$ at $3.6~μ$m and $0.30 \pm 0.02 \%$ at $4.5~μ$m, corresponding to dayside brightness temperatures of $1542^{+32}_{-31}$~K and $1557^{+35}_{-36}$~K, respectively, consistent with a vertically isothermal dayside. The respective nightside brightness temperatures are $1117^{+76}_{-71}$~K and $1167^{+69}_{-74}$~K, in line with a trend that hot Jupiters all have similar nightside temperatures. We infer a Bond albedo of $0.12_{-0.16}^{+0.14}$ and a moderate day-night heat recirculation efficiency, similar to HD 209458b. General circulation models for HD 209458b and WASP-43b predict that their bright-spots should be shifted east of the substellar point by tens of degrees, and these predictions were previously confirmed with \textit{Spitzer} full-orbit phase curve observations. The phase curves of Qatar-1b are likewise expected to exhibit eastward offsets. Instead, the observed phase curves are consistent with no offset: $11^{\circ}\pm 7^{\circ}$ at $3.6~μ$m and $-4^{\circ}\pm 7^{\circ}$ at $4.5~μ$m. The discrepancy in circulation patterns between these three otherwise similar planets points to the importance of secondary parameters like rotation rate and surface gravity, and the presence or absence of clouds, in determining atmospheric conditions on hot Jupiters.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文