暖冰巨人GJ 3470 b.从光学到近红外的行星和恒星参数修正
Warm Ice Giant GJ 3470b. II Revised Planetary and Stellar Parameters from Optical to Near-infrared Transit Photometry
摘要：
探索低质量、低密度行星的多样性特征对于了解这类行星的性质和演化至关重要。我们提出了一个均匀的分析12个新的和9个以前发表的宽带测光观测天王星大小的太阳系外行星GJ 3470b，它属于越来越多的样本的次木星机构轨道M矮星。我们分析的一致性解释了先前发表的结果之间的一些差异，并提供了行星参数的更新约束。我们的数据也与以前的过境观测这个系统是一致的。我们还提供了新的光谱测量GJ 3470从0.33至2.42 $μ$ $m$，以帮助我们的分析。我们发现GJ 3470的$R_{\star}$ = 0.48 $\pm$ 0.04 $R_{\odot}$，$M_{\star}$ = 0.51 $\pm$ 0.06 $M_{\odot}$，$T_{\rm eff}$ = 3652 $\pm$ 50 K，旋转周期为$20.70\pm{0.15}$ d，R波段振幅为0.01 mag，这足够小，电流凌日测量不应该受到恒星变化的强烈影响。我们还提出了这个系统最精确的轨道星历：T $_{o}$ = 2455983.70472 $\pm$ 0.00021 BJD $_{TDB}$，P = 3.3366487 $^{+0.0000043}_{-0.0000033}$ d，我们没有看到凌日时间变化大于1分钟的证据。我们报告的行星与恒星的半径比是0.07642 $\pm$ 0.00037。这颗行星的物理参数是$R_{p}$ = 3.88 $\pm$ 0.32 $R_{\oplus}$，$M_{p}$ = 13.73 $\pm$ 1.61 $M_{\oplus}$。由于我们修正了恒星参数，我们提出的行星半径小于以前报道的值。我们还进行了第二次分析的整个合奏过境观测的透射谱，支持H $_{2}$为主的大气表现出较强的瑞利散射斜率的存在。
英文摘要：
It is important to explore the diversity of characteristics of low-mass, low-density planets to understand the nature and evolution of this class of planets. We present a homogeneous analysis of 12 new and 9 previously published broadband photometric observations of the Uranus-sized extrasolar planet GJ 3470b, which belongs to the growing sample of sub-Jovian bodies orbiting M dwarfs. The consistency of our analysis explains some of the discrepancies between previously published results and provides updated constraints on the planetary parameters. Our data are also consistent with previous transit observations of this system. We also provide new spectroscopic measurements of GJ 3470 from 0.33 to 2.42 $μ$$m$ to aid our analysis. We find $R_{\star}$ = 0.48$\pm$0.04 $R_{\odot}$, $M_{\star}$ = 0.51$\pm$0.06 $M_{\odot}$, and $T_{\rm eff}$ = 3652$\pm$50 K for GJ 3470, along with a rotation period of $20.70\pm{0.15}$ d and an R-band amplitude of 0.01 mag, which is small enough that current transit measurements should not be strongly affected by stellar variability. We also present the most precise orbital ephemeris for this system: T$_{o}$ = 2455983.70472$\pm$0.00021 BJD$_{TDB}$, P = 3.3366487$^{+0.0000043}_{-0.0000033}$ d, and we see no evidence for transit timing variations greater than 1 minute. Our reported planet to star radius ratio is 0.07642$\pm$0.00037. The physical parameters of this planet are $R_{p}$ = 3.88$\pm$0.32 $R_{\oplus}$, and $M_{p}$ = 13.73$\pm$1.61 $M_{\oplus}$. Because of our revised stellar parameters, the planetary radius we present is smaller than previously reported values. We also perform a second analysis of the transmission spectrum of the entire ensemble of transit observations to date, supporting the existence of a H$_{2}$ dominated atmosphere exhibiting a strong Rayleigh scattering slope.
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