Precise masses for the transiting planetary system HD 106315 with HARPS

Precise masses for the transiting planetary system HD 106315 with HARPS
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带有 HARPS 的凌日行星系统 HD 106315 的精确质量

DOI:
10.1051/0004-6361/201731276
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发表时间:
2017
影响因子:
6.5
通讯作者:
Barros S
Barros S
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Barros S

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最近在K2数据中发现了多行星系统HD 106315。这两颗行星的周期分别为pb ~ 9.55和pc ~ 21.06天,半径分别为rb= 2.44±0.17R⊕和rc= 4.35±0.23R⊕。主星的亮度(V= 9.0等)使其成为透射光谱的极佳目标。然而,为了解释透射光谱,测量行星质量是至关重要的。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精心设计的,以减轻恒星变异性的影响。方法将新的径向速度数据与K2凌日测光和HD 106315c新的地面部分凌日数据进行建模,得出系统参数。结果HD 106315b的质量为12.6±3.2M⊕,密度为4.7±1.7 g cm-3; HD 106315c的质量为15.2±3.7M⊕,密度为1.01±0.29 g cm-3。因此,尽管行星c的半径几乎是行星b的两倍,但它们的质量却是一致的。我们得出结论,HD 106315c具有较厚的氢氦气体包层。利用行星内部模型对HD 106315b进行了详细的研究,发现其核心质量分数为5-29%,水质量分数为10-50%。我们的模型没有考虑到的另一种可能性是,HD 106315b由一个巨大的岩石内核和一个厚的H-He包层组成。这些行星的透射光谱学将有助于了解它们的大气成分,也有助于限制它们的核心成分。
ContextThe multi-planetary system HD 106315 was recently found in K2 data. The planets have periods ofPb~ 9.55 andPc~ 21.06 days, and radii ofrb= 2.44 ± 0.17R⊕andrc= 4.35 ± 0.23R⊕. 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.AimsWe obtained high precision radial velocities for HD 106315 to determine the mass of the two transiting planets discovered withKeplerK2. Our successful observation strategy was carefully tailored to mitigate the effect of stellar variability.MethodsWe 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.ResultsWe estimate the mass of HD 106315b to be 12.6 ± 3.2M⊕and the density to be 4.7 ± 1.7 g cm-3, while for HD 106315c we estimate a mass of 15.2 ± 3.7M⊕and a density of 1.01 ± 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.ConclusionsWe 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.
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作者:
K. Strehl
通讯作者: K. Strehl
DOI: 10.1088/0004-637x/800/2/135
发表时间: 2014-12
期刊: The Astrophysical Journal
影响因子: --
作者:
C. Dressing;D. Charbonneau;X. Dumusque;S. Gettel;F. Pepe;A. Collier Cameron;D. Latham;E. Molinari;S. Udry;L. Affer;A. Bonomo;L. Buchhave;R. Cosentino;P. Figueira;A. Fiorenzano;A. Harutyunyan;R. Haywood;J. Johnson;M. López-Morales;C. Lovis;L. Malavolta;M. Mayor;G. Micela;F. Motalebi;V. Nascimbeni;D. Phillips;G. Piotto;D. Pollacco;D. Queloz;K. Rice;D. Sasselov;D. Ségransan;A. Sozzetti;A. Szentgyorgyi;C. Watson
通讯作者: C. Dressing;D. Charbonneau;X. Dumusque;S. Gettel;F. Pepe;A. Collier Cameron;D. Latham;E. Molinari;S. Udry;L. Affer;A. Bonomo;L. Buchhave;R. Cosentino;P. Figueira;A. Fiorenzano;A. Harutyunyan;R. Haywood;J. Johnson;M. López-Morales;C. Lovis;L. Malavolta;M. Mayor;G. Micela;F. Motalebi;V. Nascimbeni;D. Phillips;G. Piotto;D. Pollacco;D. Queloz;K. Rice;D. Sasselov;D. Ségransan;A. Sozzetti;A. Szentgyorgyi;C. Watson
CORALIE 南系外行星巡天 VII - HD 108147 和 HD 168746 的两颗短周期土星伴星
DOI: --
发表时间: 2002
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作者:
F. Pepe;M. Mayor;F. Galland;D. Naef;D. Queloz;N. Santos;S. Udry;M. Burnet
通讯作者: M. Burnet
DOI: 10.1007/978-3-319-06956-2_26
发表时间: 2014-07
期刊: arXiv: Solar and Stellar Astrophysics
影响因子: --
作者:
S. Sousa
通讯作者: S. Sousa
DOI: 10.1086/142826
发表时间: 1924-07
期刊: The Astrophysical Journal
影响因子: --
作者:
D. B. McLaughlin
通讯作者: D. B. McLaughlin