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arXiv 0902.4493astro-ph.EP
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HD 80606 b的Transit的光度检测

Photometric Detection of a Transit of HD 80606b

E. Garcia-Melendo, P. R. McCullough

摘要:

我们报告了一个时间序列的B波段光度观测开始于情人节前夕,2009年2月14日,在预期的时间过境的太阳系外行星HD 80606 b。同样的凌日现象也被独立观察到(Fossey等人,2009年; Moutou等人,2009年)。对于一个由数据支持的凌日模型,最小亮度等于HD 80606标称亮度的0.990倍,发生在HJD 2454876.33。后一个时间,结合轨道周期$P = 111.4277 \pm 0.0032$天,近星点经度,$ω= 300.4977 \pm 0.0045$度,以及中次食HJD $2454424.736 \pm 0.003$的时间(Laughlin et al. 2009),改进了轨道偏心率和倾角。模型凌日的持续时间是0.47天,它的四次接触发生在HJD 2454876加上0.10、0.24、0.42和0.57天。我们描述了一个凌日模型的参数化与相互适应的偏心率,$e = 0.9337^{+0.0009}_{-0.0006}$,倾角,$i = 89.26^{+0.24}_{-0.09}$度,和行星半径单位的恒星半径\RpRs $ = 0.11^{+0.04}_{-0.02}$。

英文摘要:

We report a times series of B-band photometric observations initiated on the eve of Valentine's day, February 14, 2009, at the anticipated time of a transit of the extrasolar planet HD 80606b. The same transit has been observed independently (Fossey et al. 2009; Moutou et al. 2009). For one transit model favored by the data, minimum light equals 0.990 times the nominal brightness of HD 80606 and occurs at HJD 2454876.33. The latter time, combined with the orbital period $P = 111.4277 \pm 0.0032$ days, longitude of periastron, $ω= 300.4977 \pm 0.0045$ degrees, and time of mid-secondary eclipse HJD $2454424.736 \pm 0.003$ (Laughlin et al. 2009), refines the orbital eccentricity and inclination. The duration of the model transit is 0.47 days, and its four contacts occur at HJD 2454876 plus 0.10, 0.24, 0.42, and 0.57 days. We describe parameterizations of a transit model with mutually accommodating eccentricity, $e = 0.9337^{+0.0009}_{-0.0006}$, inclination, $i = 89.26^{+0.24}_{-0.09}$ degrees, and the planetary radius in units of the stellar radius \RpRs$ = 0.11^{+0.04}_{-0.02}$.

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