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arXiv 2406.09528astro-ph.EPastro-ph.SR
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JWST/NIRCam 对巨行星 AF Lep b 的 4-5 $μ$m 成像

JWST/NIRCam 4-5 $μ$m Imaging of the Giant Planet AF Lep b

Kyle Franson, William O. Balmer, Brendan P. Bowler, Laurent Pueyo, Yifan Zhou, Emily Rickman, Zhoujian Zhang, Sagnick Mukherjee, Tim D. Pearce, Daniella C. Bard… 展开作者

Kyle Franson, William O. Balmer, Brendan P. Bowler, Laurent Pueyo, Yifan Zhou, Emily Rickman, Zhoujian Zhang, Sagnick Mukherjee, Tim D. Pearce, Daniella C. Bardalez Gagliuffi, Lauren I. Biddle, Timothy D. Brandt, Rachel Bowens-Rubin, Justin R. Crepp, James W. Davidson,, Jacqueline Faherty, Christian Ginski, Elliott P. Horch, Marvin Morgan, Caroline V. Morley, Marshall D. Perrin, Aniket Sanghi, Maissa Salama, Christopher A. Theissen, Quang H. Tran, Trevor N. Wolf

AI总结:

本研究利用 JWST/NIRCam 对巨行星 AF Lep b 进行 4-5 μm 成像,证实其存在非平衡碳化学与高金属丰度,并证明 JWST 能在内工作角内有效探测小角分离系外行星。

摘要:

具有 $3 \\, M_\mathrm{Jup}$ 的动力学质量,最近发现的巨行星 AF Lep b 是拥有直接质量测量的最低质量成像行星。其年轻且光谱型接近 L/T 过渡带,使其成为研究低表面重力下云层和大气化学影响的有望目标。在本工作中,我们展示了 AF Lep b 的 JWST/NIRCam 成像。在两个历元中,我们分别在 F444W ($4.4 \\, \mathrm{\mu m}$) 波段以 $9.6$ 和 $8.7$ 的信噪比探测到了 AF Lep b。在观测期间行星角分离为 $320 \\, \mathrm{mas}$ 时,日冕仪吞吐量为 ${\approx}7\\%$,证明 NIRCam 极佳的灵敏度一直保持到小角分离处。AF Lep b 的 F444W 测光证实了非平衡碳化学和增强的大气金属丰度的存在。这些观测还对系统中更宽角分离的行星设定了深度限制,排除了 $15.6 \\, \mathrm{au}$ ($0.58$ 角秒) 以外 $1.1 \\, M_\mathrm{Jup}$ 的行星、$27 \\, \mathrm{au}$ ($1$ 角秒) 以外 $1.1 \\, M_\mathrm{Sat}$ 的行星,以及 $67 \\, \mathrm{au}$ ($2.5$ 角秒) 以外 $2.8 \\, M_\mathrm{Nep}$ 的行星。我们还展示了 AF Lep b 的新 Keck/NIRC2 $L'$ 成像;将其与两个历元的 F444W 测光和先前的 Keck $L'$ 测光相结合,为 AF Lep b 在数月至数年时间尺度上的长期 $3{-}5 \\, \mathrm{\mu m}$ 变化提供了限制。AF Lep b 是迄今为止用 JWST 成像的角分离最小的行星,证明行星可以在名义(50% 吞吐量)NIRCam 日冕仪内工作角内被很好地恢复。

英文摘要:

With a dynamical mass of $3 \, M_\mathrm{Jup}$, the recently discovered giant planet AF Lep b is the lowest-mass imaged planet with a direct mass measurement. Its youth and spectral type near the L/T transition make it a promising target to study the impact of clouds and atmospheric chemistry at low surface gravities. In this work, we present JWST/NIRCam imaging of AF Lep b. Across two epochs, we detect AF Lep b in F444W ($4.4 \, \mathrm{μm}$) with S/N ratios of $9.6$ and $8.7$, respectively. At the planet's separation of $320 \, \mathrm{mas}$ during the observations, the coronagraphic throughput is ${\approx}7\%$, demonstrating that NIRCam's excellent sensitivity persists down to small separations. The F444W photometry of AF Lep b affirms the presence of disequilibrium carbon chemistry and enhanced atmospheric metallicity. These observations also place deep limits on wider-separation planets in the system, ruling out $1.1 \, M_\mathrm{Jup}$ planets beyond $15.6 \, \mathrm{au}$ ($0.58$ arcsec), $1.1 \, M_\mathrm{Sat}$ planets beyond $27 \, \mathrm{au}$ ($1$ arcsec), and $2.8 \, M_\mathrm{Nep}$ planets beyond $67 \, \mathrm{au}$ ($2.5$ arcsec). We also present new Keck/NIRC2 $L'$ imaging of AF Lep b; combining this with the two epochs of F444W photometry and previous Keck $L'$ photometry provides limits on the long-term $3{-}5 \, \mathrm{μm}$ variability of AF Lep b on months-to-years timescales. AF Lep b is the closest-separation planet imaged with JWST to date, demonstrating that planets can be recovered well inside the nominal (50\% throughput) NIRCam coronagraph inner working angle.

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。

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