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arXiv 1901.04739astro-ph.EP
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靠近M0矮星可宜居带内缘的凌日超级地球

A transiting super-Earth close to the inner edge of the habitable zone of an M0 dwarf star

E. Díez Alonso, J. I. González Hernández, B. Toledo-Padrón, S. L. Suárez Gómez, A. Suárez Mascareño, D. S. Aguado, C. González Gutiérrez, A. Cabrera-Lavers, J. … 展开作者

E. Díez Alonso, J. I. González Hernández, B. Toledo-Padrón, S. L. Suárez Gómez, A. Suárez Mascareño, D. S. Aguado, C. González Gutiérrez, A. Cabrera-Lavers, J. Carballido-Landeira, L. Bonavera, F. J. de Cos Juez, R. Rebolo

摘要:

我们提出了一个超级地球轨道接近冷矮星K2-286(EPIC 249889081)的宜居带的内边缘,从K2任务在其$15^{th}$活动的数据检测。这颗行星的半径为$2.1\pm0.2$ R $_{\oplus}$,接近半径分布的1.5 - 2.0 R $_{\oplus}$间隙。平衡温度为$347^{+21}_{-11}$ K,比大多数质量测量良好的小行星要低,轨道周期为$27.359\pm0.005$天。K2-286位于距离$76.3\pm0.3$ pc的位置,是一颗M0 V恒星,估计有效温度为$3926\pm100$ K,比其他拥有系外行星的M型矮星活跃度低。行星在恒星上引起的径向速度半振幅预计为$1.9^{+1.3}_{-1.2}$ m $\cdot$ s $^{-1}$,过境透射光谱中的信号振幅估计为$5.0\pm3.0$ ppm。对于这个相对明亮的目标($m_V=12.76, m_{Ks}=9.32$),在宜居带的内边缘承载着一个过境的超级地球,质量测量和过境光谱学的后续观测应该是可取的。

英文摘要:

We present a super-Earth orbiting close to the inner edge of the habitable zone of the cool dwarf star K2-286 (EPIC 249889081), detected with data from the K2 mission in its $15^{th}$ campaign. The planet has radius of $2.1\pm0.2$ R$_{\oplus}$, near the 1.5 - 2.0 R$_{\oplus}$ gap in the radii distribution. The equilibrium temperature is $347^{+21}_{-11}$ K, cooler than most of the small planets with well measured masses, and the orbital period is $27.359\pm0.005$ days. K2-286, located at a distance of $76.3\pm0.3$ pc, is an M0V star with estimated effective temperature of $3926\pm100$ K, less active than other M dwarf stars hosting exoplanets. The expected radial velocity semi-amplitude induced by the planet on the star is $1.9^{+1.3}_{-1.2}$ m$\cdot$s$^{-1}$, and the amplitude of signals in transit transmission spectroscopy is estimated at $5.0\pm3.0$ ppm. Follow-up observations for mass measurements and transit spectroscopy should be desirable for this relatively bright target ($m_V=12.76, m_{Ks}=9.32$) hosting a transiting super-Earth within the inner edge of the habitable zone.

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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