演化中质量恒星的行星伴星：仙女座14、鲸鱼座81、猎户座6和HD 167042
Planetary Companions to Evolved Intermediate-Mass Stars: 14 Andromedae, 81 Ceti, 6 Lyncis, and HD 167042
摘要：
我们报告冈山天体物理天文台对G和K巨星进行精确的多普勒测量，发现了四颗围绕演化的中等质量恒星运行的太阳系外行星。所有的主星都被认为是早期的F-型或A-型矮星。[14]（K 0 III）是一个质量为2.2 M_solar的团簇巨星，有一颗质量最小的行星m_2sin i=4.8 M_Jup，其轨道近似为圆形，周期为186天。这是一颗围绕着中等质量恒星的最内层行星，而这样的行星只在巨星系中被发现。Cet 81（G5 III）是一颗质量为2.4 M_2的团簇巨星，其主行星质量为m_2sini =5.3 M_Jup，轨道周期为953天，偏心率为e=0.21。6 Lyn（K 0 IV）是一颗演化程度较低的亚巨星，太阳质量为1.7 M，其行星质量为m_2sin i=2.4 M_Jup，公转周期为899天，轨道半径为0.13。HD 167042（K1 IV）也是一颗演化程度较低的恒星，太阳质量为1.5 M_，拥有一颗质量为m_2sin i=1.6 M_Jup的行星，轨道周期为418天，e=0.10。这颗行星是由Johnson等人独立宣布的（2008，ApJ，675，784）。所有的主星都有太阳或太阳以下的金属丰度，这支持了与矮星相比，行星所在的巨星缺乏富含金属的倾向。
英文摘要：
We report on the detection of four extrasolar planets orbiting evolved intermediate-mass stars from a precise Doppler survey of G and K giants at Okayama Astrophysical Observatory. All of the host stars are considered to be formerly early F-type or A-type dwarfs when they were on the main sequence. 14 And (K0 III) is a clump giant with a mass of 2.2 M_solar and has a planet of minimum mass m_2sin i=4.8 M_Jup in a nearly circular orbit with a 186 day period. This is one of the innermost planets around evolved intermediate-mass stars and such planets have only been discovered in clump giants. 81 Cet (G5 III) is a clump giant with 2.4 M_solar hosting a planet of m_2sin i=5.3 M_Jup in a 953 day orbit with an eccentricity of e=0.21. 6 Lyn (K0 IV) is a less evolved subgiant with 1.7 M_solar and has a planet of m_2sin i=2.4 M_Jup in a 899 day orbit with e=0.13. HD 167042 (K1 IV) is also a less evolved star with 1.5 M_solar hosting a planet of m_2sin i=1.6 M_Jup in a 418 day orbit with e=0.10. This planet was independently announced by Johnson et al. (2008, ApJ, 675, 784). All of the host stars have solar or sub-solar metallicity, which supports the lack of metal-rich tendency in planet-harboring giants in contrast to the case of dwarfs.
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