TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS
TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS
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TOI-1055 b：以 HARPS、TESS 和 CHEOPS 为特征的海王星行星
DOI：
10.1051/0004-6361/202245607
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发表时间：
2023
影响因子：
6.5
通讯作者：
Bonfanti A
中科院分区：
文献类型：
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作者：
Bonfanti A
TOI-1055是一颗类似太阳的星星，拥有一颗海王星大小的行星，轨道为17.5天（TOI-1055 B）。由两个独立的小组使用几乎相同的HARPS光谱进行的径向速度（RV）分析提供了行星质量的测量结果，相差1.2 σ。AimsOur的目的是在这项工作中，我们的目的是解决公布的行星质量的不一致性显着扩展的HARPS RV测量集，并采用一种新的分析工具，能够帐户和纠正恒星活动。我们的进一步的目的是提高精度的行星半径的测量通过观察两个过境的行星与CHEOPS空间telescoper.MethodsWe适合一个斜正常的功能，每个互相关函数提取的HARPS光谱，以获得RV测量和超参数用于去趋势。我们使用断点技术评估了超参数沿着RV时间序列的相关性变化。我们进行了联合光度和RV分析，使用马尔可夫链蒙特卡罗计划，同时下降趋势的光变曲线和RV的时间series.ResultsWe坚定地检测到开普勒信号的TOI-1055 B，推导出行星质量（12%）。该值与文献中的两个估计值之一一致，但它明显更精确。由于TESS凌日光变曲线结合精密的CHEOPS测光，我们还推导出行星半径为（1.9%）。我们的质量和半径测量值意味着平均密度为g cm−3（14%）。我们进一步推断的行星结构，并发现，TOI-1055 B是非常有可能举办一个实质性的气体信封的质量和厚度。ConclusionsOur RV提取结合的断点技术发挥了关键作用，在最佳的去除恒星活动的HARPS时间序列，使我们能够解决的紧张局势，迄今公布的TOI-1055 B的行星质量值。
ContextTOI-1055 is a Sun-like star known to host a transiting Neptune-sized planet on a 17.5-day orbit (TOI-1055 b). Radial velocity (RV) analyses carried out by two independent groups using nearly the same set of HARPS spectra have provided measurements of planetary masses that differ by ∼2σ.AimsOur aim in this work is to solve the inconsistency in the published planetary masses by significantly extending the set of HARPS RV measurements and employing a new analysis tool that is able to account and correct for stellar activity. Our further aim was to improve the precision on measurements of the planetary radius by observing two transits of the planet with the CHEOPS space telescope.MethodsWe fit a skew normal function to each cross correlation function extracted from the HARPS spectra to obtain RV measurements and hyperparameters to be used for the detrending. We evaluated the correlation changes of the hyperparameters along the RV time series using the breakpoint technique. We performed a joint photometric and RV analysis using a Markov chain Monte Carlo scheme to simultaneously detrend the light curves and the RV time series.ResultsWe firmly detected the Keplerian signal of TOI-1055 b, deriving a planetary mass of (∼12%). This value is in agreement with one of the two estimates in the literature, but it is significantly more precise. Thanks to the TESS transit light curves combined with exquisite CHEOPS photometry, we also derived a planetary radius of (∼1.9%). Our mass and radius measurements imply a mean density of g cm−3(∼14%). We further inferred the planetary structure and found that TOI-1055 b is very likely to host a substantial gas envelope with a mass of and a thickness of .ConclusionsOur RV extraction combined with the breakpoint technique has played a key role in the optimal removal of stellar activity from the HARPS time series, enabling us to solve the tension in the planetary mass values published so far for TOI-1055 b.
DOI：
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发表时间：
1984-03
期刊：
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影响因子：
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作者：
J. Culhane
通讯作者：
J. Culhane
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