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arXiv 1305.6985astro-ph.EPastro-ph.SR
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GJ 1214 b的多色Transit Photometry通过BJHKs波段和GJ 1214恒星光变的长期监测

Multi-Color Transit Photometry of GJ 1214b through BJHKs-Bands and a Long-Term Monitoring of the Stellar Variability of GJ 1214

Norio Narita, Akihiko Fukui, Masahiro Ikoma, Yasunori Hori, Kenji Kurosaki, Yui Kawashima, Takahiro Nagayama, Masahiro Onitsuka, Amnart Sukom, Yasushi Nakajima,… 展开作者

Norio Narita, Akihiko Fukui, Masahiro Ikoma, Yasunori Hori, Kenji Kurosaki, Yui Kawashima, Takahiro Nagayama, Masahiro Onitsuka, Amnart Sukom, Yasushi Nakajima, Motohide Tamura, Daisuke Kuroda, Kenshi Yanagisawa, Teruyuki Hirano, Kiyoe Kawauchi, Masayuki Kuzuhara, Hiroshi Ohnuki, Takuya Suenaga, Yasuhiro H. Takahashi, Hideyuki Izumiura, Nobuyuki Kawai, Michitoshi Yoshida

摘要:

本文给出了GJ 1214 b在BJHKs波段的5条新的凌日光变曲线。使用Subaru 8.2米望远镜上的Suprime-Cam和FOCAS仪器在B波段观测到两次凌日,使用IRSF 1.4米望远镜上的SIRIUS相机在JHKs波段同时观测到一次凌日。MCMC分析表明,行星与恒星的半径比为:Rp/Rs = 0.11651 \pm 0.00065(B波段,Subaru/Suprime-Cam),Rp/Rs = 0.11601 \pm 0.00117(B波段,斯巴鲁/FOCAS),Rp/Rs = 0.11654 \pm 0.00080(J波段,IRSF/SIRIUS),Rp/Rs = 0.11550 ^{+0.00142}-0.00153}(H波段,IRSF/SIRIUS),Rp/Rs = 0.11547 \pm 0.00127(K波段,IRSF/SIRIUS)。斯巴鲁Suprime-Cam凌日测光显示了可能的点交叉功能。新的过境深度与Howe & Burrows(2012)的理论模型的先前研究的过境深度的比较表明,高分子量大气(例如,1% H $_2$ O + 99% N $_2$)模式是最有可能的,然而,仍然不排除有大量云的低分子量(以氢为主)大气。我们还报告了用MITSUME 50厘米望远镜在g ′-、Rc-和Ic-波段同时观测到的GJ 1214恒星亮度变化的长期监测结果。在2012年的78个夜晚进行了32个夜晚的监测,我们发现了周期Ps = 44.3 \pm 1.2天的周期性亮度变化,g '波段的半振幅为2.1% \pm 0.4%,Rc波段的半振幅为0.56% \pm 0.08%,Ic波段的半振幅为0.32% \pm 0.04%。

英文摘要:

We present 5 new transit light curves of GJ 1214b taken in BJHKs-bands. Two transits were observed in B-band using the Suprime-Cam and the FOCAS instruments onboard the Subaru 8.2m telescope, and one transit was done in JHKs-bands simultaneously with the SIRIUS camera on the IRSF 1.4m telescope. MCMC analyses show that the planet-to-star radius ratios are, Rp/Rs = 0.11651 \pm 0.00065 (B-band, Subaru/Suprime-Cam), Rp/Rs = 0.11601 \pm 0.00117 (B-band, Subaru/FOCAS), Rp/Rs = 0.11654 \pm 0.00080 (J-band, IRSF/SIRIUS), Rp/Rs = 0.11550 ^{+0.00142}_{-0.00153} (H-band, IRSF/SIRIUS), and Rp/Rs = 0.11547 \pm 0.00127 (Ks-band, IRSF/SIRIUS). The Subaru Suprime-Cam transit photometry shows a possible spot-crossing feature. Comparisons of the new transit depths and those from previous studies with the theoretical models by Howe & Burrows (2012) suggest that the high molecular weight atmosphere (e.g., 1% H$_2$O + 99% N$_2$) models are most likely, however, the low molecular weight (hydrogen dominated) atmospheres with extensive clouds are still not excluded. We also report a long-term monitoring of the stellar brightness variability of GJ 1214 observed with the MITSuME 50cm telescope in g'-, Rc-, and Ic-bands simultaneously. The monitoring was conducted for 32 nights spanning 78 nights in 2012, and we find a periodic brightness variation with a period of Ps = 44.3 \pm 1.2 days and semi-amplitudes of 2.1% \pm 0.4% in g'-band, 0.56% \pm 0.08% in Rc-band, and 0.32% \pm 0.04% in Ic-band.

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