Non-Detections of Helium in the Young Sub-Jovian Planets K2-100b, HD 63433b, V1298 Tau c
arxiv(2024)
摘要
We search for excess in-transit absorption of neutral helium at 1.083 μm
in the atmospheres of the young (<800 Myr) sub-Jovian (0.2-0.5 R_J)
planets HD 63433b, K2-100b, and V1298 Tau c using high-resolution (R 25,000)
transit observations taken with Keck II/NIRSPEC. Our observations do not show
evidence of helium absorption for any of the planets in our sample. We
calculate 3σ upper limits on the planets' excess helium absorption of
<0.47
of equivalent width, we constrain these to <2.52, <4.44, and <8.49 mA for HD
63433b, K2-100b, and V1298 Tau c, respectively. We fit our transmission spectra
with one-dimensional Parker wind models to determine upper limits on the
planets' mass-loss rates of <7.9×10^10, <1.25×10^11, and
<7.9×10^11g s^-1. Our non-detections align with expectations from
one-dimensional hydrodynamic escape models, magnetic fields, and stellar wind
confinement. The upper limits we measure for these planets are consistent with
predicted trends in system age and He equivalent width from 1D hydrodynamic
models.
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