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arXiv 0902.4616astro-ph.EP
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HD 80606的行星伴星探测到transit

Detection of a transit by the planetary companion of HD 80606

Stephen J. Fossey, Ingo P. Waldman, David M. Kipping

摘要:

我们报告了一个过境出口的检测~ 3.9-质量的行星HD 80606 b,一个物体在一个高偏心率(e ~ 0.93)围绕其母星的近似太阳型。HD 80606的变星信号的天体物理学真实性通过两个独立的望远镜系统的观测得到了证实,并与现场的几颗参考星进行了核对。相对于附近的比较星HD 80607的差分测光提供了精确的光变曲线。用全偏心轨道模型模拟的光变曲线表明,行星/恒星半径比为0.1057 +/- 0.0018,对应于太阳半径母星的行星半径为1.029 R_J;精确的轨道倾角为89.285 +/- 0.023度,总的过境时间为12.1 +/- 0.4小时。这颗行星因此加入HD 17156 b的行列,成为一类高偏心率的凌日行星,其中HD 80606 b的周期最长,轨道偏心率也最高。斯皮策空间天文台最近报告发现了HD 80606 b的二次日食,这使得可以结合主凌的中期时间进行分析,其中系统的轨道参数可以受到严格的限制。我们得到了T_tr = HJD(2454876.344 +/- 0.011)+(111.4277 +/- 0.0032)E的凌日星历。

英文摘要:

We report the detection of a transit egress by the ~ 3.9-Jupiter-mass planet HD 80606b, an object in a highly-eccentric orbit (e ~ 0.93) about its parent star of approximately solar type. The astrophysical reality of the signal of variability in HD 80606 is confirmed by observation with two independent telescope systems, and checks against several reference stars in the field. Differential photometry with respect to the nearby comparison star HD 80607 provides a precise light curve. Modelling of the light curve with a full eccentric-orbit model indicates a planet/star-radius ratio of 0.1057 +/- 0.0018, corresponding to a planet radius of 1.029 R_J for a solar-radius parent star; and a precise orbital inclination of 89.285 +/- 0.023 degrees, giving a total transit duration of 12.1 +/- 0.4 hours. The planet hence joins HD 17156b in a class of highly eccentric transiting planets, in which HD 80606b has both the longest period and most eccentric orbit. The recently reported discovery of a secondary eclipse of HD 80606b by the Spitzer Space Observatory permits a combined analysis with the mid-time of primary transit in which the orbital parameters of the system can be tightly constrained. We derive a transit ephemeris of T_tr = HJD (2454876.344 +/- 0.011) + (111.4277 +/- 0.0032) E.

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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