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arXiv 1109.5166astro-ph.EPastro-ph.SR
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HD 168443 b的Transit搜索:改进的轨道参数和Photometry

A Search for the Transit of HD 168443b: Improved Orbital Parameters and Photometry

Genady Pilyavsky, Suvrath Mahadevan, Stephen R. Kane, Andrew W. Howard, David R. Ciardi, Chris de Pree, Diana Dragomir, Debra Fischer, Gregory W. Henry, Eric L.… 展开作者

Genady Pilyavsky, Suvrath Mahadevan, Stephen R. Kane, Andrew W. Howard, David R. Ciardi, Chris de Pree, Diana Dragomir, Debra Fischer, Gregory W. Henry, Eric L. N. Jensen, Gregory Laughlin, Hannah Marlowe, Markus Rabus, Kaspar von Braun, Jason T. Wright, Xuesong X. Wang

摘要:

在明亮恒星周围发现凌日行星,有可能大大增进我们对行星大气的了解。在这项工作中,我们提出了对HD 168443 b凌日的搜索,HD 168443 b是一颗围绕明亮恒星HD 168443 V=6.92运行的大质量行星,周期为58.11天。行星轨道的高偏心率e=0.53显著提高了先验的过境概率,超出了圆形轨道的预期,使HD 168443成为我们正在进行的过境星历精化和监测调查(TERMS)的候选者。使用额外的径向速度从ESPRIK-HIRES,我们改进了这个多行星系统的轨道参数,并推导出一个新的过境星历表HD 168443 b。在过境窗口减少的不确定性,使光度过境搜索切实可行。在预测的过境窗口期间获得的光度观测在三个晚上。2010年9月7日获得的CTIO 1.0 m测光具有检测凌日所需的精度,但刚好落在我们最终的凌日窗口之外。费尔伯恩天文台的T8 0.8米自动测光望远镜(APT)在109个夜晚进行的夜间测光表明,HD 168443在几周的时间尺度上是恒定的。2011年4月28日和6月25日的高步频测光显示没有凌日的证据。我们能够排除HD 168443 b的非掠食凌日。

英文摘要:

The discovery of transiting planets around bright stars holds the potential to greatly enhance our understanding of planetary atmospheres. In this work we present the search for transits of HD 168443b, a massive planet orbiting the bright star HD 168443 V=6.92 with a period of 58.11 days. The high eccentricity of the planetary orbit e=0.53 significantly enhances the a-priori transit probability beyond that expected for a circular orbit, making HD 168443 a candidate for our ongoing Transit Ephemeris Refinement and Monitoring Survey (TERMS). Using additional radial velocities from Keck-HIRES, we refined the orbital parameters of this multi-planet system and derived a new transit ephemeris for HD 168443b. The reduced uncertainties in the transit window make a photometric transit search practicable. Photometric observations acquired during predicted transit windows were obtained on three nights. CTIO 1.0 m photometry acquired on 2010 September 7 had the required precision to detect a transit but fell just outside of our final transit window. Nightly photometry from the T8 0.8 m Automated Photometric Telescope (APT) at Fairborn Observatory, acquired over a span of 109 nights, demonstrates that HD 168443 is constant on a time scale of weeks. Higher-cadence photometry on 2011 April 28 and June 25 shows no evidence of a transit. We are able to rule out a non-grazing transit of HD 168443b.

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