HD 37605 c的发现和HD 37605 b凌日的处置性双光子检测
The Discovery of HD 37605c and a Dispositive Null Detection of Transits of HD 37605b
摘要：
我们报告的径向速度发现的第二个行星质量的同伴K 0 V星HD 37605，这是已知的主机偏心，P~55天的类木行星，HD 37605 b。第二颗行星HD 37605 c的周期约为7.5年，偏心率较低，Msini约为3.4兆木星。我们的发现是在Hobby-Eberly望远镜和Keck天文台近8年的径向速度跟踪中完成的，其中包括作为Transit Ephemeris Refinement and Monitoring Survey（TERMS）努力的一部分进行的观测，以提供精确的星历表给长周期行星进行过境跟踪。通过近8年的137次径向速度观测，我们提供了HD 37605系统的良好轨道解和HD 37605 b的精确凌日星历。我们的动态分析揭示了非常小的行星-行星相互作用和一个微不足道的过境时间变化。使用预测的星历表，我们进行了过境搜索HD 37605 b的光度数据采取的T12 0.8米自动光电望远镜（APT）和恒星的微变和振荡（MOST）卫星。虽然APT测光没有捕捉到凌日窗，但它描述了HD 37605的恒星活动，这与它是一颗古老的不活跃恒星的说法一致，它的自转周期为57.67天。MOST测光使我们能够报告一个决定性的零检测的非放牧过境这颗行星。在预测的过境窗口内，我们排除了>> 10 σ时1.9%的边缘预测深度，并排除了大于5 σ时碰撞参量b>0.951的任何过境。我们提出了通过自举计算开普勒轨道参数不确定度的BOOTTRAN程序包。我们发现我们的轨道参数计算的RVLIN软件包和误差条BOOTTRAN与贝叶斯分析使用MCMC产生的一致性。
英文摘要：
We report the radial-velocity discovery of a second planetary mass companion to the K0 V star HD 37605, which was already known to host an eccentric, P~55 days Jovian planet, HD 37605b. This second planet, HD 37605c, has a period of ~7.5 years with a low eccentricity and an Msini of ~3.4 MJup. Our discovery was made with the nearly 8 years of radial velocity follow-up at the Hobby-Eberly Telescope and Keck Observatory, including observations made as part of the Transit Ephemeris Refinement and Monitoring Survey (TERMS) effort to provide precise ephemerides to long-period planets for transit follow-up. With a total of 137 radial velocity observations covering almost eight years, we provide a good orbital solution of the HD 37605 system, and a precise transit ephemeris for HD 37605b. Our dynamic analysis reveals very minimal planet-planet interaction and an insignificant transit time variation. Using the predicted ephemeris, we performed a transit search for HD 37605b with the photometric data taken by the T12 0.8-m Automatic Photoelectric Telescope (APT) and the Microvariability and Oscillations of Stars (MOST) satellite. Though the APT photometry did not capture the transit window, it characterized the stellar activity of HD 37605, which is consistent of it being an old, inactive star, with a tentative rotation period of 57.67 days. The MOST photometry enabled us to report a dispositive null detection of a non-grazing transit for this planet. Within the predicted transit window, we exclude an edge-on predicted depth of 1.9% at >>10sigma, and exclude any transit with an impact parameter b>0.951 at greater than 5sigma. We present the BOOTTRAN package for calculating Keplerian orbital parameter uncertainties via bootstrapping. We found consistency between our orbital parameters calculated by the RVLIN package and error bars by BOOTTRAN with those produced by a Bayesian analysis using MCMC.
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