Photoevaporation Valley ·
The Radius Gap
un
seel
.com · XUV wind · super-Earths · sub-Neptunes
Valley
1.8 R⊕
L_x/L_bol
saturated ~10⁻³
Stage
—
Young X-ray star
XUV / escaping H
Sub-Neptune (keeps gas)
Stripped rocky core
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.com · Photoevaporation Valley: How Stellar X-rays Carve the Radius Gap