Eruptive mass loss less than a year before the explosion of superluminous supernovae - I. The cases of SN 2020xga and SN 2022xgc

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Fig. 4.

Blackbody temperatures and radii of SN 2020xga, SN 2022xgc, SN 2018ibb and iPTF16eh. Top: Temperature evolution of SN 2020xga, SN 2022xgc, SN 2018ibb and iPTF16eh derived from the blackbody fits to the photometric (circle symbols) and the spectroscopic (star symbols) data. The gray background points represent the temperature evolution of the ZTF sample (Chen et al. 2023a). Bottom: Blackbody radius evolution of SN 2020xga, SN 2022xgc, SN 2018ibb and iPTF16eh utilizing photometry and spectra in comparison with the ZTF sample (gray). The arrows indicate the epochs where the X-shooter spectra of SN 2020xga and SN 2022xgc show the second Mg II absorption system.

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