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arXiv 2104.05653astro-ph.EP
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冷恒星周围的热行星--两个短周期的迷你海王星穿过晚K矮星TOI-1260

Hot planets around cool stars -- two short-period mini-Neptunes transiting the late K-dwarf TOI-1260

I. Y. Georgieva, C. M. Persson, O. Barragán, G. Nowak, M. Fridlund, D. Locci, E. Palle, R. Luque, I. Carleo, D. Gandolfi, S. R. Kane, J. Korth, K. G. Stassun, J… 展开作者

I. Y. Georgieva, C. M. Persson, O. Barragán, G. Nowak, M. Fridlund, D. Locci, E. Palle, R. Luque, I. Carleo, D. Gandolfi, S. R. Kane, J. Korth, K. G. Stassun, J. Livingston, E. C. Matthews, K. A. Collins, S. B. Howell, L. M. Serrano, S. Albrecht, A. Bieryla, C. E. Brasseur, D. Ciardi, W. D. Cochran, K. D. Colon, I. J. M. Crossfield, Sz. Csizmadia, H. J. Deeg, M. Esposito, E. Furlan, T. Gan, E. Goffo, E. Gonzales, S. Grziwa, E. . W. Guenther, P. Guerra, T. Hirano, J. M. Jenkins, E. L. N. Jensen, P. Kabáth, E. Knudstrup, K. W. F. Lam, D. W. Latham, A. M. Levine, R. A. Matson, S. McDermott, H. L. M. Osborne, M. Paegert, S. N . Quinn, S. Redfield, G. R. Ricker, J. E. Schlieder, N. J. Scott, S. Seager, A. M. S. Smith, P. Tenenbaum, J. D. Twicken, R. Vanderspek, V. Van Eylen, J. N. Winn

摘要:

我们提出了两个亚海王星在近轨道的发现和表征,以及一个类似大小的试探性外行星,轨道TOI-1260 -低金属量K6 V矮星。TESS的光度测定得出了$R_{\rm b} = 2.33 \pm 0.10$ $R_{\oplus}$和$R_{\rm c} = 2.82 \pm 0.15$ $R_{\oplus}$的半径,TOI-1260 b和TOI-1260 c的周期分别为3.13天和7.49天。我们将TESS数据与一系列地面跟踪观测相结合,以描述行星系的特征。由HARPS-N高精度径向速度得到$M_{\rm b} = 8.61_{ - 1.46 } ^ { + 1.36 }$、$M_{\oplus}$和$M_{\rm c} = 11.84_{ - 3.23 } ^ { + 3.38 }$、$M_{\oplus}$。恒星是适度活跃的复杂的活动模式,这需要使用高斯过程回归的光变曲线去趋势和径向速度建模,在后一种情况下,适当的活动指标指导。我们成功地从行星信号中分离出恒星诱导信号,强调了高斯过程方法的重要性和实用性。我们测试系统的稳定性对大气光蒸发,并发现TOI-1260行星是典型的$2-3$ $R_{\oplus}$范围的结构和组成模糊的经典例子。

英文摘要:

We present the discovery and characterization of two sub-Neptunes in close orbits, as well as a tentative outer planet of a similar size, orbiting TOI-1260 - a low metallicity K6V dwarf star. Photometry from TESS yields radii of $R_{\rm b} = 2.33 \pm 0.10$ $R_{\oplus}$ and $R_{\rm c} = 2.82 \pm 0.15$ $R_{\oplus}$, and periods of 3.13 and 7.49 days for TOI-1260b and TOI-1260c, respectively. We combined the TESS data with a series of ground-based follow-up observations to characterize the planetary system. From HARPS-N high-precision radial velocities we obtain $M_{\rm b} = 8.61_{ - 1.46 } ^ { + 1.36 }$ $M_{\oplus}$ and $M_{\rm c} = 11.84_{ - 3.23 } ^ { + 3.38 }$ $M_{\oplus}$. The star is moderately active with a complex activity pattern, which necessitated the use of Gaussian process regression for both the light curve detrending and the radial velocity modelling, in the latter case guided by suitable activity indicators. We successfully disentangle the stellar-induced signal from the planetary signals, underlining the importance and usefulness of the Gaussian Process approach. We test the system's stability against atmospheric photoevaporation and find that the TOI-1260 planets are classic examples of the structure and composition ambiguity typical for the $2-3$ $R_{\oplus}$ range.

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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