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JWST/NIRCam 4-5 \\(\\mu\\)m Imaging of the Giant Planet AF Lep b
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JWST/NIRCam 4-5 \\(\\mu\\)m Imaging of the Giant Planet AF Lep b
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JWST/NIRCam 4-5 \\(\\mu\\)m Imaging of the Giant Planet AF Lep b
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Paper
JWST/NIRCam 4-5 \\(\\mu\\)m Imaging of the Giant Planet AF Lep b
2024
Overview
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{\\mu m}\\)) 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{\\mu m}\\) 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.
Publisher
Cornell University Library, arXiv.org
Subject
