arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1609.09074astro-ph.EP
收藏

非凌日热气巨星HD 88133 b热谱的直接探测证据

Evidence for the Direct Detection of the Thermal Spectrum of the Non-Transiting Hot Gas Giant HD 88133 b

Danielle Piskorz, Bjorn Benneke, Nathan R. Crockett, Alexandra C. Lockwood, Geoffrey A. Blake, Travis S. Barman, Chad F. Bender, Marta L. Bryan, John S. Carr, D… 展开作者

Danielle Piskorz, Bjorn Benneke, Nathan R. Crockett, Alexandra C. Lockwood, Geoffrey A. Blake, Travis S. Barman, Chad F. Bender, Marta L. Bryan, John S. Carr, Debra A. Fischer, Andrew W. Howard, Howard Isaacson, John A. Johnson

摘要:

我们的目标的热发射光谱的非过境气体巨星HD 88133 b的高分辨率近红外光谱,通过治疗行星和它的主星作为一个光谱双星。对于足够深的恒星和行星在多个时期的总流量观测,有可能解决的信号相比,较亮的恒星光谱的热气巨星的大气,在一个水平上与总的散粒噪声的完整数据集一致。为此,我们首先进行主成分分析,以消除地球大气对观测光谱的贡献。然后,我们使用互相关分析梳理出主恒星和HD 88133 b的光谱,以确定其轨道并确定大气不透明度的关键来源。总共获得了HD 88133系统的六个时期的Keck NIRSPEC L波段观测和三个时期的Keck NIRSPEC K波段观测。基于对两个大气模型的完整数据集的多历元互相关计算的极大似然曲线的分析,我们报告了对非凌日系外行星HD 88133 b的发射光谱的直接探测,并测量了开普勒轨道速度的径向投影为40 $\pm$ 15 km/s,真实质量为1.02 $^{+0.61}_{-0.28}M_J$,轨道倾角为15 ${^{+6}_{-5}}^{\circ}$,大气不透明度结构在高色散占主导地位的水蒸气。再加上该系统11年来的径向速度测量,为HD 88133提供了最新的星历。

英文摘要:

We target the thermal emission spectrum of the non-transiting gas giant HD 88133 b with high-resolution near-infrared spectroscopy, by treating the planet and its host star as a spectroscopic binary. For sufficiently deep summed flux observations of the star and planet across multiple epochs, it is possible to resolve the signal of the hot gas giant's atmosphere compared to the brighter stellar spectrum, at a level consistent with the aggregate shot noise of the full data set. To do this, we first perform a principal component analysis to remove the contribution of the Earth's atmosphere to the observed spectra. Then, we use a cross-correlation analysis to tease out the spectra of the host star and HD 88133 b to determine its orbit and identify key sources of atmospheric opacity. In total, six epochs of Keck NIRSPEC L band observations and three epochs of Keck NIRSPEC K band observations of the HD 88133 system were obtained. Based on an analysis of the maximum likelihood curves calculated from the multi-epoch cross correlation of the full data set with two atmospheric models, we report the direct detection of the emission spectrum of the non-transiting exoplanet HD 88133 b and measure a radial projection of the Keplerian orbital velocity of 40 $\pm$ 15 km/s, a true mass of 1.02$^{+0.61}_{-0.28}M_J$, a nearly face-on orbital inclination of 15${^{+6}_{-5}}^{\circ}$, and an atmosphere opacity structure at high dispersion dominated by water vapor. This, combined with eleven years of radial velocity measurements of the system, provides the most up-to-date ephemeris for HD 88133.

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。

↑