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We present the first rest-frame optical size-luminosity relation of galaxiesat $z>7$, using the NIRCam imaging data obtained by the GLASS James Webb SpaceTelescope Early Release Science (GLASS-JWST-ERS) program, providing the deepestextragalactic data of the ERS campaign. Our sample consist of 19photometrically selected bright galaxies with $m_\text{F444W}\leq27.8$ at$7<z<9$ and $m_\text{F444W}<28.2$ at $z\sim9-15$. We measure the size of thegalaxies in 5 bands, from the rest-frame optical ($\sim4800\,{\rm \AA}$) to theultra-violet (UV; $\sim1600\,{\rm \AA}$) based on the S\'ersic model, andanalyze the size-luminosity relation as a function of wavelength. Remarkably,the data quality of NIRCam imaging is sufficient to probe the half-light radius$r_e$ down to $\sim 100$ pc at $z>7$. Given the limited sample size andmagnitude range, we first fix the slope to that observed for larger samples inrest-frame UV using HST samples. The median size $r_0$ at the referenceluminosity $M=-21$ decreases slightly from rest-frame optical ($600\pm80$ pc)to UV ($450\pm130$ pc). We then re-fit the size-luminosity relation allowingthe slope to vary. The slope is consistent with $\beta\sim0.2$ for all bandsexcept F150W, where we find a marginally steeper slope of $\beta=0.53\pm0.15$.The steep UV slope is mainly driven by the smallest and faintest galaxies. Ifconfirmed by larger samples, it implies that the UV size-luminosity relationbreaks toward the faint end as suggested by lensing studies.

Early results from GLASS-JWST. V: the first rest-frame optical size-luminosity relation of galaxies at $z>7$