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arXiv 1503.00762astro-ph.EP
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从多色photometry得到的HAT-P-23和WASP-48行星系的物理性质

Physical properties of the HAT-P-23 and WASP-48 planetary systems from multi-colour photometry

S. Ciceri, L. Mancini, J. Southworth, I. Bruni, N. Nikolov, G. D'Ago, T. Schroeder, V. Bozza, J. Tregloan-Reed, Th. Henning

摘要:

对行星凌日事件进行精确和重复的光度跟踪观测,对于精确描述系外行星的物理特性非常重要。对系外行星的主要特征的良好了解是追踪其起源和演化的基础。多波段光度观测在这一过程中发挥了重要作用。通过使用新的测光数据,我们计算了两个过境行星系的物理性质的精确估计。我们提出了新的宽带,多色,测光观测使用三个小类望远镜和望远镜散焦技术。对于两个目标中的每一个,通过四个光学滤波器同时观察到一个过境事件。WASP-48 b的一次凌日是用同一个天文台的两台望远镜监测的。通过用{ \sc jktebop}拟合渡越光变曲线和从公开的光谱测量获得系统的物理参数。我们修改了两个行星系的物理参数,发现HAT-P-23 b和WASP-48 b的半径分别比发现论文($R_{b}=1.224 \pm 0.037 R_{Jup}$和$R_{b}=1.396 \pm 0.051 \, R_{Jup}$)中测量的半径小。这两颗行星的密度比之前公布的要高(HAT-P-23和WASP-48的$ρ_{b}$分别为~1.1和~0.3 $ρ_{jup}$),因此这两颗热彗星不再位于高度膨胀行星的参数空间区域。分析行星的测量半径作为光波长的函数的变化,揭示了实验不确定性内的平坦透射光谱。我们还确认了食接触双星NSVS-3071474在WASP-48的同一视场中的存在,我们将其周期值修正为0.459 d。

英文摘要:

Accurate and repeated photometric follow-up observations of planetary-transit events are important to precisely characterize the physical properties of exoplanets. A good knowledge of the main characteristics of the exoplanets is fundamental to trace their origin and evolution. Multi-band photometric observations play an important role in this process. By using new photometric data, we computed precise estimates of the physical properties of two transiting planetary systems. We present new broad-band, multi-colour, photometric observations obtained using three small class telescopes and the telescope-defocussing technique. For each of the two targets, one transit event was simultaneously observed through four optical filters. One transit of WASP-48 b was monitored with two telescopes from the same observatory. The physical parameters of the systems were obtained by fitting the transit light curves with {\sc jktebop} and from published spectroscopic measurements. We have revised the physical parameters of the two planetary systems, finding a smaller radius for both HAT-P-23 b and WASP-48 b, $R_{b}=1.224 \pm 0.037 R_{Jup}$ and $R_{b}=1.396 \pm 0.051 \, R_{Jup}$, respectively, than those measured in the discovery papers ($R_{b}=1.368 \pm 0.090 R_{Jup}$ and $R_{b}=1.67 \pm 0.10 R_{Jup}$). The density of the two planets are higher than those previously published ($ρ_{b}$ ~1.1 and ~0.3 $ρ_{jup}$ for HAT-P-23 and WASP-48 respectively) hence the two Hot Jupiters are no longer located in a parameter space region of highly inflated planets. An analysis of the variation of the planet's measured radius as a function of optical wavelength reveals flat transmission spectra within the experimental uncertainties. We also confirm the presence of the eclipsing contact binary NSVS-3071474 in the same field of view of WASP-48, for which we refine the value of the period to be 0.459 d.

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