Extra-solar planet search by radial velocity measurements of stars

通过恒星径向速度测量来搜索太阳系外行星

• 批准号: 17340056
• 负责人: ANDO Hiroyasu
• 金额: $ 8.84万
• 依托单位: National Astronomical Observatory of Japan
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17340056/
• 关键词: Extra-solar Planet Search; Oriain and evolution of planets; G-type giants; Space science; Astronomy; 惑星期限・進化

In this three-year project, we have completed the extra-solar planet search program, that is, we tried to pick up the planet candidates by radial velocity observation of 300 G-giants with Subaru telescope (HDS), and followed up the radial velocity variations of these candidates with HIDES high dispersion spectrograph at Okayama Astrophysical Observatory, NAOCCES at Xinglong station in China, and HOES at Hugen san in Korea. As a result, we discovered 5 exoplanets and 1 brown dwarf, whose results were published in refereed journals. In addition to this, we submitted a paper on the discovery of 4 exoplanets. It is quite rare even in the world that one group accomplished the discovery of about 10 exoplanets, and we are now in a good position to discuss on the planet formation in intermediate mass stars. In a preliminary analysis, orbital periods of these planets are shown to be longer than 100days, and there seems to be a lower limit in orbital period for stars of intermediate mass range, … More which is a different situation from the planets around dwarf stars like the Sun. If this is true, it gives a certain limit on planet formation scenario. Increase of these sample might lead to give a firm foundation on this scenario. It is also shown that metallicity in the planet hovering stars is higher than that in non-hovering stars, which is a confirmation of the previous works.Scientists of Japan, China, and Korea had two workshops at Hakone in Japan in 2006 and at Lijiang in China in 2007, respectively. In these meeting, we presented the observational results and discussed on the observational plans, and developed the software concerning radial velocity reduction. In particular, we achieved a tremendous progress in improving accuracy of radial velocity measurement. Previous precision, 5m/s at Okayama and 9m/s at Hugen san are much improved into 2m/s and 4m/s, respectively. Our intensive discussion during these workshops could lead to the mutual understandings that it is important that instrumental profile (IP) of the spectrograph should not change over the relevant wavelength, and the sampling points for IP should be increased in a sense of over sampling, that is, use of CCD with a small pixel size. Accuracy at Xinglong in China was not improved into less than 10m/s, but we are confident about how to improve radial velocity accuracy in futur.Based on these results, we are considering increase in number of exoplanets around G-giants and based on the reinforced statistical data we try to understand planet formation Less

在这个为期三年的项目中，我们完成了太阳系外行星搜索计划，即利用斯巴鲁望远镜(HDS)对300G巨星进行径向速度观测来拾取候选行星，并利用冈山天体物理天文台的HIDS高色散谱仪、中国兴隆站的NAOCCES和韩国虎根山的HOES跟踪这些候选行星的径向速度变化。结果，我们发现了5颗系外行星和1颗棕矮星，其结果发表在参考期刊上。除此之外，我们还提交了一篇关于发现4颗系外行星的论文。一个小组完成了大约10颗系外行星的发现，这在世界上也是相当罕见的，我们现在处于一个很好的位置来讨论中等质量恒星中的行星形成。初步分析表明，这些行星的轨道周期长于100天，中等质量范围的恒星…的轨道周期似乎有一个下限。这与太阳等矮星周围的行星情况不同。如果这是真的，它对行星形成的情景给予了一定的限制。这些样本增加可能会为这种情况奠定坚实的基础。这也证实了之前的工作。日本、中国和韩国的科学家分别于2006年在日本箱根和2007年在中国丽江举办了两次研讨会。在这些会议上，我们介绍了观测结果，讨论了观测计划，并开发了径向速度折减软件。特别是，我们在提高径向速度测量精度方面取得了巨大的进步。之前的精度，冈山的5米/S和虎根山的9米/S分别提高到了2米/S和4米/S。我们在这些研讨会期间的深入讨论可能会导致相互理解，即重要的是光谱仪的仪器剖面(IP)不应随相关波长而改变，IP的采样点应在过度采样的意义上增加，即使用小像素尺寸的CCD。中国在兴隆的精度没有提高到10m/S以下，但我们对未来如何提高径向速度精度有信心。基于这些结果，我们正在考虑增加G巨星周围的系外行星数量，并基于加强的统计数据，我们试图更少地理解行星的形成

项目成果

Development of Iodine Cells for Subaru HDS and Okayama HIDES. III. An Improvement on the Radial-Velocity Measurement Technique

为斯巴鲁 HDS 和冈山 HIDES 开发碘电池。

• 发表时间: 2008
• 期刊: PASJ 60
• 作者: Kambe;E.;Sato;B.;Izumiura;H.;他13名
• 通讯作者: 他13名

The N2K Consortium. II. A Transiting Hot Saturn around HD 149026 with a Large Dense Core

• DOI: 10.1086/449306
• 发表时间: 2005-06
• 期刊: The Astrophysical Journal
• 作者: B. Sato;Debra A. Fischer;Gregory W. Henry;G. Laughlin;R. P. Butler;Geoffrey W Marcy;S. Vogt;P. Bodenheimer;Shigeru Ida;Shigeru Ida;E. Toyota;A. Wolf;J. A. Valenti;Louis J. Boyd;John A. Johnson;Jason T. Wright;M. Ammons;S. Robinson;J. Strader;C. McCarthy;K. Tah;D. Minniti

2006/2007 Procyon Big Campaign:岡山での観測と視線速度解析

2006/2007 Procyon 大活动：冈山观测和径向速度分析

• 发表时间: 2007
• 作者: 神戸 栄治;安藤 裕康;ほか
• 通讯作者: ほか

2006/2007 Procyon big campaign Observation and redial velocity analysis at Okayama

2006/2007 Procyon 大活动 冈山观察和重拨速度分析

• 发表时间: 2007
• 作者: Kambe;E.;Ando;H.;et. al.
• 通讯作者: et. al.

A Substellar Companion to the Intermediate-Mass Giant 11 Comae

中等质量巨星 11 彗发的亚恒星伴星

• DOI: 10.1086/523297
• 发表时间: 2007-09
• 期刊: Astrophysical Journal
• 影响因子: 4.9
• 作者: et a;Zhao G.;Wang H.;Liu Y. J.;K. Noguchi;Bun'ei Sato
• 通讯作者: Bun'ei Sato