热木星XO-5 b的独立确认和精确参数
Independent confirmation and refined parameters of the hot Jupiter XO-5b
摘要：
我们提出了XO-5 b的HATNet观测结果，根据Burke等人（2008年）声明中描述的证据，即光谱平分线变化和轨道相位之间缺乏显着相关性，证实了其行星性质。此外，使用广泛的光谱测量跨越多个季节，我们调查了相对较大的散射在谱线平分线。我们还研究了可能的混合恒星配置（分层三元组，机会对齐），可以模仿行星信号，我们能够表明，没有一个是一致的所有数据的总和。对S活动指数的分析表明没有显著的恒星活动。我们对行星参数的结果与Burke et al.（2008）中的值一致，我们使用我们的数据改进了恒星和行星参数。XO-5 b是一颗稍微演化的晚G型恒星，质量M_s = 0.88 ± 0.03，半径R_s = 1.08 ± 0.04，金属丰度接近太阳。行星的质量和半径分别为M_p = 1.059 +/- 0.028 M_Jup和R_p = 1.109 +/- 0.050 R_Jup，对应的平均密度为0.96 -0.11 +0.14 g/cm^3。轨道星历为P = 4.187757 +/- 0.000011，E= 2454552.67168 +/- 0.00029（BJD），凌日为0.1307 +/- 0.0013 d。通过测量四个单独的转运中心，我们没有发现转运时间变化的迹象。行星XO-5 b以其惊人的高萨夫罗诺夫数而闻名，并且与其他具有类似周期的凌日系外行星相比，具有高表面重力。
英文摘要：
We present HATNet observations of XO-5b, confirming its planetary nature based on evidence beyond that described in the announcement of Burke et al. (2008), namely, the lack of significant correlation between spectral bisector variations and orbital phase. In addition, using extensive spectroscopic measurements spanning multiple seasons, we investigate the relatively large scatter in the spectral line bisectors. We also examine possible blended stellar configurations (hierarchical triples, chance alignments) that can mimic the planet signals, and we are able to show that none are consistent with the sum of all the data. The analysis of the S activity index shows no significant stellar activity. Our results for the planet parameters are consistent with values in Burke et al. (2008), and we refine both the stellar and planetary parameters using our data. XO-5b orbits a slightly evolved, late G type star with mass M_s = 0.88 +/- 0.03, radius R_s = 1.08 +/- 0.04, and metallicity close to solar. The planetary mass and radius are M_p = 1.059 +/- 0.028 M_Jup and R_p = 1.109 +/- 0.050 R_Jup, respectively, corresponding to a mean density of 0.96 -0.11 +0.14 g/cm^3. The ephemeris for the orbit is P = 4.187757 +/- 0.000011, E= 2454552.67168 +/- 0.00029 (BJD) with transit duration of 0.1307 +/- 0.0013 d. By measuring four individual transit centers, we found no signs for transit timing variations. The planet XO-5b is notable for its anomalously high Safronov number, and has a high surface gravity when compared to other transiting exoplanets with similar period.
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