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arXiv 0905.1728astro-ph.EPastro-ph.IM
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太阳系外行星的高频差近红外计时观测:I. GJ 436 b和XO-1 b

High Cadence Near Infrared Timing Observations of Extrasolar Planets: I. GJ 436b and XO-1b

C. Caceres, V. D. Ivanov, D. Minniti, D. Naef, C. Melo, E. Mason, F. Selman, G. Pietrzynski

摘要:

目前,唯一对附近恒星(太近而无法进行微透镜)周围的地球质量行星敏感的技术是监测凌日系外行星的凌日时间变化。我们在热海王星GJ 436 b和热木星XO-1b系统中寻找其他行星,使用J和Ks波段的高节奏观测。报道了新的高精度凌日定时测量:GJ 436 b Tc = 2454238.47898 \pm 0.00046 HJD; XO-1b Tc(A)= 2454218.83331 \pm 0.00114 HJD,Tc(B)= 2454222.77539 \pm 0.00036 HJD,Tc(C)= 2454222.77597 \pm 0.00039 HJD,Tc(D)= 2454226.71769 \pm 0.00034 HJD,它们被用来推导新的星历。我们还确定了这些过境的深度。未检测到统计学显著的时间偏差。我们证明了高节奏地面近红外观测成功地将平均渡越时间限制在~30秒,是太空任务的可行替代方案。

英文摘要:

Currently the only technique sensitive to Earth mass planets around nearby stars (that are too close for microlensing) is the monitoring of the transit time variations of the transiting extrasolar planets. We search for additional planets in the systems of the hot Neptune GJ 436b, and the hot-Jupiter XO-1b, using high cadence observations in the J and Ks bands. New high-precision transit timing measurements are reported: GJ 436b Tc = 2454238.47898 \pm 0.00046 HJD; XO-1b Tc(A) = 2454218.83331 \pm 0.00114 HJD, Tc(B) = 2454222.77539 \pm 0.00036 HJD, Tc(C) = 2454222.77597 \pm 0.00039 HJD, Tc(D) = 2454226.71769 \pm 0.00034 HJD, and they were used to derive new ephemeris. We also determined depths for these transits. No statistically significant timing deviations were detected. We demonstrate that the high cadence ground based near-infrared observations are successful in constraining the mean transit time to ~30 sec., and are a viable alternative to space missions.

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。

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