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arXiv 1709.00865astro-ph.EP
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带有HARPS的凌日行星系HD 106315的精确质量

Precise masses for the transiting planetary system HD 106315 with HARPS

S. C. C. Barros, H. Gosselin, J. Lillo-Box, D. Bayliss, E. Delgado Mena, B. Brugger, A. Santerne, D. J. Armstrong, V. Adibekyan, J. D. Armstrong, D. Barrado, J.… 展开作者

S. C. C. Barros, H. Gosselin, J. Lillo-Box, D. Bayliss, E. Delgado Mena, B. Brugger, A. Santerne, D. J. Armstrong, V. Adibekyan, J. D. Armstrong, D. Barrado, J. Bento, I. Boisse, A. S. Bonomo, F. Bouchy, D. J. A. Brown, W. D. Cochran, A. Collier Cameron, M. Deleuil, O. Demangeon, R. F. Díaz, A. Doyle, X. Dumusque, D. Ehrenreich, N. Espinoza, F. Faedi, J. P. Faria, P. Figueira, E. Foxell, G. Hébrard, S. Hojjatpanah, J. Jackman, M. Lendl, R. Ligi, C. Lovis, C. Melo, O. Mousis, J. J. Neal, H. P. Osborn, D. Pollacco, N. C. Santos, R. Sefako, A. Shporer, S. G. Sousa, A. H. M. J. Triaud, S. Udry, A. Vigan, A. Wyttenbach

摘要:

多行星系HD 106315最近在K2数据中被发现。行星的周期为$P_b \sim9.55$和$P_c \sim 21.06\,$日,半径为$ r_b = 2.44 \pm 0.17\, $和$r_c = 4.35 \pm 0.23\, $ $R_{\oplus}$。主星的亮度(V=9.0等)使其成为透射光谱学的绝佳目标。然而,要解释透射光谱,测量行星质量至关重要。我们获得了HD~106315的高精度径向速度,以确定开普勒K2发现的两颗凌日行星的质量。我们成功的观测策略是经过精心设计的,以减轻恒星变化的影响。我们模拟了新的径向速度数据与K2过境测光和一个新的地面部分过境HD 106315 c推导系统参数。我们估计HD 106315 b的质量为12.6 $\pm$ 3.2 $M_{\oplus}$,密度为$4.7 \pm 1.7\, g\,cm^{-3}$,而对于HD 106315 c,我们估计质量为15.2 $\pm$ 3.7 $M_{\oplus}$,密度为$1.01 \pm 0.29\, $ g\,cm $^{-3}$。因此,尽管行星c的半径几乎是行星b的两倍,但它们的质量彼此一致。我们的结论是,HD 106315 c有一个厚的氢氦气体包层。使用行星内部模型对HD 106315 b进行的详细研究将核心质量分数限制为5- 29%,水质量分数限制为10- 50%。另一个我们的模型没有考虑到的可能性是,HD 106315 b是由一个巨大的岩石核心和一个厚的H-He包层组成的。这些行星的透射光谱将使人们了解它们的大气成分,并有助于限制它们的核心成分。

英文摘要:

The multi-planetary system HD 106315 was recently found in K2 data . The planets have periods of $P_b \sim9.55$ and $P_c \sim 21.06\,$days, and radii of $ r_b = 2.44 \pm 0.17\, $ and $r_c = 4.35 \pm 0.23\, $ $R_{\oplus}$. The brightness of the host star (V=9.0 mag) makes it an excellent target for transmission spectroscopy. However, to interpret transmission spectra it is crucial to measure the planetary masses. We obtained high precision radial velocities for HD~106315 to determine the mass of the two transiting planets discovered with Kepler K2. Our successful observation strategy was carefully tailored to mitigate the effect of stellar variability. We modelled the new radial velocity data together with the K2 transit photometry and a new ground-based partial transit of HD 106315c to derive system parameters. We estimate the mass of HD 106315b to be 12.6 $\pm$ 3.2 $M_{\oplus}$ and the density to be $4.7 \pm 1.7\, g\,cm^{-3}$, while for HD 106315c we estimate a mass of 15.2 $\pm$ 3.7 $M_{\oplus}$ and a density of $1.01 \pm 0.29\, $g\,cm$^{-3}$. Hence, despite planet c having a radius almost twice as large as planet b, their masses are consistent with one another. We conclude that HD 106315c has a thick hydrogen-helium gaseous envelope. A detailed investigation of HD 106315b using a planetary interior model constrains the core mass fraction to be 5-29\%, and the water mass fraction to be 10-50\%. An alternative, not considered by our model, is that HD 106315b is composed of a large rocky core with a thick H-He envelope. Transmission spectroscopy of these planets will give insight into their atmospheric compositions and also help constrain their core compositions.

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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