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arXiv 1208.5709astro-ph.EP
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重新审视巨蟹座rho 1 e:凌日超级地球的新质量测定

Revisiting rho 1 Cancri e: A New Mass Determination Of The Transiting super-Earth

Michael Endl, Paul Robertson, William D. Cochran, Phillip J. MacQueen, Erik J. Brugamyer, Caroline Caldwell, Robert A. Wittenmyer, Stuart I. Barnes, Kevin Gullikson

摘要:

我们提出了一个质量测定凌日超地球rho 1巨蟹座e的基础上,近700个精确的径向速度(RV)测量。这个广泛的RV数据集包括麦克唐纳天文台行星搜索收集的数据和Lick和Keck天文台公布的数据(Fischer等人,2008年)。我们在Harlan J. Smith 2.7 m望远镜的Tull Coude光谱仪上获得了212个RV测量值,并将它们与我们在2003-2004年使用Hobby-Eberly望远镜(HET)的高分辨率光谱仪(HRS)拍摄的131个光谱的新多普勒缩减相结合,用于最初发现rho 1 Cancri e。使用这个大数据集,我们获得了该系统的5行星开普勒轨道解,并测量了rho 1 Cnc e的RV半振幅K = 6.29 +/- 0.21 m/s,并确定质量为8.37 +/- 0.38 M_Earth。因此,质量的不确定性小于5%。这颗行星之前被发现过境其母星(Winn et al. 2011,Demory et al. 2011),这使他们能够估计其半径。结合Gillon等人(2012)的最新半径估计值,我们得到平均密度为rho = 4.50 +/- 0.20 g/cm^3。rho 1 Cnc e在质量半径图中的位置表明,这颗行星含有大量的volitales,可能是围绕岩石核心的富含水的外壳。

英文摘要:

We present a mass determination for the transiting super-Earth rho 1 Cancri e based on nearly 700 precise radial velocity (RV) measurements. This extensive RV data set consists of data collected by the McDonald Observatory planet search and published data from Lick and Keck observatories (Fischer et al. 2008). We obtained 212 RV measurements with the Tull Coude Spectrograph at the Harlan J. Smith 2.7 m Telescope and combined them with a new Doppler reduction of the 131 spectra that we have taken in 2003-2004 with the High-Resolution-Spectrograph (HRS) at the Hobby-Eberly Telescope (HET) for the original discovery of rho 1 Cancri e. Using this large data set we obtain a 5-planet Keplerian orbital solution for the system and measure an RV semi-amplitude of K = 6.29 +/- 0.21 m/s for rho 1 Cnc e and determine a mass of 8.37 +/- 0.38 M_Earth. The uncertainty in mass is thus less than 5%. This planet was previously found to transit its parent star (Winn et al. 2011, Demory et al. 2011), which allowed them to estimate its radius. Combined with the latest radius estimate from Gillon et al. (2012), we obtain a mean density of rho = 4.50 +/- 0.20 g/cm^3. The location of rho 1 Cnc e in the mass-radius diagram suggests that the planet contains a significant amount of volitales, possibly a water-rich envelope surrounding a rocky core.

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