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arXiv 1202.0446astro-ph.EP
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一个围绕M矮星GJ 667 C的行星系,在其宜居带中至少有一个超级地球

A planetary system around the nearby M dwarf GJ 667C with at least one super-Earth in its habitable zone

Guillem Anglada-Escudé, Pamela Arriagada, Steven S. Vogt, Eugenio J. Rivera, R. Paul Butler, Jeffrey D. Crane, Stephen A. Shectman, Ian B. Thompson, Dante Minni… 展开作者

Guillem Anglada-Escudé, Pamela Arriagada, Steven S. Vogt, Eugenio J. Rivera, R. Paul Butler, Jeffrey D. Crane, Stephen A. Shectman, Ian B. Thompson, Dante Minniti, Nader Haghighipour, Brad D. Carter, C. G. Tinney, Robert A. Wittenmyer, Jeremy A. Bailey, Simon J. O'Toole, Hugh R. A. Jones, James S. Jenkins

摘要:

我们重新分析了附近M1.5矮星GJ 667 C的4年HARPS光谱,这些光谱可以通过ESO公共档案获得。新的径向速度(RV)的测量获得使用一种新的数据分析技术,推导出多普勒测量和其他仪器的影响,使用最小二乘法。将这些新的143个测量结果与来自麦哲伦/PFS和凯克/HIRES光谱仪的41个额外的RV相结合,揭示了3个额外的信号,超出了先前报道的7.2天候选者,周期为28天,75天,并且长期趋势与气体巨星的存在一致(周期为10年)。28天的信号意味着一颗最小质量为4.5 Mearth的行星候选者在恒星液态水宜居带的规范定义范围内运行,这是一个类似地球的行星可以在其表面维持液态水的恒星周围区域。尽管如此,这个候选者的最终水支持能力取决于未知的属性,如它的大气组成和内部动力学。75天的信号不太确定,受到潜在的91天信号之间的混叠相互作用的显著影响,以及在两个活动指数中检测到的105天的恒星旋转周期。GJ 667 C是GJ 667 AB的共同自行伴星,与太阳相比,GJ 667 AB的金属含量较低。在三星系统中贫金属M矮星的宜居带中存在超级地球,支持了这样的世界在银河系中应该无处不在的证据。

英文摘要:

We re-analyze 4 years of HARPS spectra of the nearby M1.5 dwarf GJ 667C available through the ESO public archive. The new radial velocity (RV) measurements were obtained using a new data analysis technique that derives the Doppler measurement and other instrumental effects using a least-squares approach. Combining these new 143 measurements with 41 additional RVs from the Magellan/PFS and Keck/HIRES spectrometers, reveals 3 additional signals beyond the previously reported 7.2-day candidate, with periods of 28 days, 75 days, and a secular trend consistent with the presence of a gas giant (Period sim 10 years). The 28-day signal implies a planet candidate with a minimum mass of 4.5 Mearth orbiting well within the canonical definition of the star's liquid water habitable zone, this is, the region around the star at which an Earth-like planet could sustain liquid water on its surface. Still, the ultimate water supporting capability of this candidate depends on properties that are unknown such as its albedo, atmospheric composition and interior dynamics. The 75-day signal is less certain, being significantly affected by aliasing interactions among a potential 91-day signal, and the likely rotation period of the star at 105 days detected in two activity indices. GJ 667C is the common proper motion companion to the GJ 667AB binary, which is metal poor compared to the Sun. The presence of a super-Earth in the habitable zone of a metal poor M dwarf in a triple star system, supports the evidence that such worlds should be ubiquitous in the Galaxy.

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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