arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2501.14596astro-ph.EP
收藏

JWST COMPASS:超级地球TOI-776b的NIRSpec/G395H透射光谱观测

JWST COMPASS: NIRSpec/G395H Transmission Observations of the Super-Earth TOI-776b

Lili Alderson, Sarah E. Moran, Nicole L. Wallack, Natasha E. Batalha, Nicholas F. Wogan, Anne Dattilo, Hannah R. Wakeford, Jea Adam Redai, Munazza K. Alam, Arty… 展开作者

Lili Alderson, Sarah E. Moran, Nicole L. Wallack, Natasha E. Batalha, Nicholas F. Wogan, Anne Dattilo, Hannah R. Wakeford, Jea Adam Redai, Munazza K. Alam, Artyom Aguichine, Natalie M. Batalha, Anna Gagnebin, Peter Gao, James Kirk, Mercedes López-Morales, Annabella Meech, Johanna Teske, Angie Wolfgang

AI总结:

利用JWST NIRSpec/G395H对超级地球TOI-776b进行两次凌星观测,获得2.8-5.2μm透射光谱,通过两种还原流程和picaso模型排除高金属丰度,为类地行星大气表征提供新约束。

摘要:

我们展示了利用JWST NIRSpec/G395H对约520K、1.85R⊕、4.0M⊕的超级地球TOI-776b进行的两次凌星观测,获得了2.8-5.2μm的透射光谱。使用ExoTiC-JEDI和Eureka!流程进行数据还原,我们在两次观测和两种还原中,在30像素宽(约0.02μm)的光谱通道中获得了34ppm的中位凌星深度精度。我们发现我们的独立还原产生了一致的透射光谱,然而,每次观测显示出不同的整体结构。对于两种还原,Visit 1倾向于平线,而Visit 2倾向于在NRS1和NRS2探测器之间具有偏移的平线;然而,我们能够在建模分析中按照先前文献中概述的方法纠正这一偏移。使用picaso前向模型,我们在所有情况下可以以≥3σ的置信度排除金属丰度高达至少100倍太阳丰度且不透明压力为10⁻³ bar的情况,然而,确切的较低限制在两次观测之间有所不同,Visit 1排除了≲100倍太阳丰度,而Visit 2的较低限制延伸至约350倍太阳丰度以上。我们的结果为JWST日益增多的超级地球大气约束清单增添了新内容,这些约束为理解类地行星的多样性和表征挑战提供了关键见解。

英文摘要:

We present two transit observations of the $\sim$520K, 1.85R$_\oplus$, 4.0M$_\oplus$ super-Earth TOI-776b with JWST NIRSpec/G395H, resulting in a 2.8-5.2$μ$m transmission spectrum. Producing reductions using the ExoTiC-JEDI and Eureka! pipelines, we obtain a median transit depth precision of 34ppm for both visits and both reductions in spectroscopic channels 30 pixels wide ($\sim$0.02$μ$m). We find that our independent reductions produce consistent transmission spectra, however, each visit shows differing overall structure. For both reductions, a flat line is preferred for Visit 1 while a flat line with an offset between the NRS1 and NRS2 detectors is preferred for Visit 2; however, we are able to correct for this offset during our modeling analysis following methods outlined in previous literature. Using picaso forward models, we can rule out metallicities up to at least 100$\times$ solar with an opaque pressure of 10$^{-3}$ bar to $\geq$3$σ$ in all cases, however, the exact lower limit varies between the visits, with Visit 1 ruling out $\lesssim$100$\times$ solar while the lower limits for Visit 2 extend beyond $\sim$350$\times$ solar. Our results add to the growing list of super-Earth atmospheric constraints by JWST, which provide critical insight into the diversity and challenges of characterizing terrestrial planets.

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。

↑