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arXiv 1406.3261astro-ph.EPastro-ph.SR
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凌日暖木星WASP-80 b的多波段、多历元观测

Multi-band, Multi-epoch Observations of the Transiting Warm Jupiter WASP-80b

Akihiko Fukui, Yui Kawashima, Masahiro Ikoma, Norio Narita, Masahiro Onitsuka, Yoshifusa Ita, Hiroki Onozato, Shogo Nishiyama, Haruka Baba, Tsuguru Ryu, Teruyuk… 展开作者

Akihiko Fukui, Yui Kawashima, Masahiro Ikoma, Norio Narita, Masahiro Onitsuka, Yoshifusa Ita, Hiroki Onozato, Shogo Nishiyama, Haruka Baba, Tsuguru Ryu, Teruyuki Hirano, Yasunori Hori, Kenji Kurosaki, Kiyoe Kawauchi, Yasuhiro H. Takahashi, Takahiro Nagayama, Motohide Tamura, Nobuyuki Kawai, Daisuke Kuroda, Shogo Nagayama, Kouji Ohta, Yasuhiro Shimizu, Kenshi Yanagisawa, Michitoshi Yoshida, Hideyuki Izumiura

摘要:

WASP-80 b是一颗温暖的木星,它正在穿越一颗明亮的晚K/早M矮星,这为将热木星的大气研究扩展到低温区域提供了一个很好的机会。我们报告了WASP-80 b的多波段,多历元凌日观测,使用三个地面望远镜,覆盖从光学(g ',Rc和Ic波段)到近红外(NIR; J,H和Ks波段)波长。我们观测到5次主凌日,每次同时在3或4个不同的波段,得到17条独立的凌日光变曲线。结合它们与以前的工作的结果,我们发现,所观察到的透射光谱是在很大程度上一致的太阳丰度和厚云大气模型在1.7 $σ$差异水平。另一方面,我们发现在光学区相比,在2.9 $σ$水平的近红外区的边际光谱上升,这可能表明在大气中的霾的存在。我们模拟了太阳丰度,但有雾的大气中的理论透射光谱,发现一个平衡温度为600 K的模型可以很好地解释观测数据,具有1.0 $σ$的差异水平。我们还搜索过境时间的变化,但没有发现超过50秒的线性星历的时间过剩。此外,我们进行了43天的光度监测的主恒星的光学波段,发现没有显着变化的恒星亮度。结合这一事实,即没有点交叉事件中观察到的五个凌日,我们的研究结果证实了以前的发现,主机星出现安静的斑点活动,尽管强烈的色球活动的迹象。

英文摘要:

WASP-80b is a warm Jupiter transiting a bright late-K/early-M dwarf, providing a good opportunity to extend the atmospheric study of hot Jupiters toward the lower temperature regime. We report multi-band, multi-epoch transit observations of WASP-80b by using three ground-based telescopes covering from optical (g', Rc, and Ic bands) to near-infrared (NIR; J, H, and Ks bands) wavelengths. We observe 5 primary transits, each of which in 3 or 4 different bands simultaneously, obtaining 17 independent transit light curves. Combining them with results from previous works, we find that the observed transmission spectrum is largely consistent with both a solar abundance and thick cloud atmospheric models at 1.7$σ$ discrepancy level. On the other hand, we find a marginal spectral rise in optical region compared to the NIR region at 2.9$σ$ level, which possibly indicates the existence of haze in the atmosphere. We simulate theoretical transmission spectra for a solar abundance but hazy atmosphere, finding that a model with equilibrium temperature of 600 K can explain the observed data well, having a discrepancy level of 1.0$σ$. We also search for transit timing variations, but find no timing excess larger than 50 s from a linear ephemeris. In addition, we conduct 43 day long photometric monitoring of the host star in the optical bands, finding no significant variation in the stellar brightness. Combined with the fact that no spot-crossing event is observed in the five transits, our results confirm previous findings that the host star appears quiet for spot activities, despite the indications of strong chromospheric activities.

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