NGTS 15b, 16b, 17b, and 18b: four hot Jupiters from the Next-Generation Transit Survey

NGTS 15b, 16b, 17b, and 18b: four hot Jupiters from the Next-Generation Transit Survey
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NGTS 15b、16b、17b 和 18b:来自下一代凌日巡天的四颗热木星

DOI:
10.1093/mnras/stab815
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发表时间:
2021
影响因子:
4.8
通讯作者:
Tilbrook R
Tilbrook R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tilbrook R

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我们报告了利用下一代凌日调查(NGTS)发现的四颗新的热木星。NGTS-15b、NGTS-16b、NGTS-17b和NGTS-18b是围绕G型主序星运行的短周期(P<5 d)行星,半径和质量分别在1.10~1.30RJ和0.41~0.76MJ之间。通过考虑主星的光度和行星的小轨道分离(0.039-0.052 Au),我们发现所有四个热木星都是高度辐照的,因此占据了行星膨胀机制有效的参数空间区域。与统计研究的比较和对行星高入射通量的考虑表明,NGTS-16b、NGTS-17b和NGTS-18b确实可能被膨胀,尽管在使用当前的贝叶斯膨胀模型分析时出现了一些差异。然而,支配半径膨胀的潜在关系仍然鲜为人知。我们推测,加入额外的超参数来描述潜在因素,如重元素分数,以及更新的热木星目录,将完善膨胀模型,从而进一步理解导致膨胀行星的物理过程。
We report the discovery of four new hot Jupiters with the Next-Generation Transit Survey (NGTS). NGTS-15b, NGTS-16b, NGTS-17b, and NGTS-18b are short-period (P< 5 d) planets orbiting G-type main-sequence stars, with radii and masses between 1.10 and 1.30RJand 0.41 and 0.76MJ, respectively. By considering the host star luminosities and the planets’ small orbital separations (0.039–0.052 au), we find that all four hot Jupiters are highly irradiated and therefore occupy a region of parameter space in which planetary inflation mechanisms become effective. Comparison with statistical studies and a consideration of the planets’ high incident fluxes reveal that NGTS-16b, NGTS-17b, and NGTS-18b are indeed likely inflated, although some disparities arise upon analysis with current Bayesian inflationary models. However, the underlying relationships that govern radius inflation remain poorly understood. We postulate that the inclusion of additional hyperparameters to describe latent factors such as heavy element fraction, as well as the addition of an updated catalogue of hot Jupiters, would refine inflationary models, thus furthering our understanding of the physical processes that give rise to inflated planets.
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