Extended Data Fig. 9: Evolution of the SED of ZTF SLRN-2020 progenitor prior to the onset of the optical transient. | Nature

Extended Data Fig. 9: Evolution of the SED of ZTF SLRN-2020 progenitor prior to the onset of the optical transient.

From: An infrared transient from a star engulfing a planet

Extended Data Fig. 9: Evolution of the SED of ZTF SLRN-2020 progenitor prior to the onset of the optical transient.The alternative text for this image may have been generated using AI.

The orange points show the optical/IR photometry from ≈ 6−12 years before the outburst. The black points show the evolution of the progenitor in the mid-IR starting ≈ 1.7 years before the transient. Solid points indicate detections while hollow points denote 3σ upper limits. For the −30 d and −244 d epochs, we show the best fit Silicate dust emission model fit using the mid-IR photometry (see text), while we show estimated upper limits to the dust emission using the W2 photometry. For the last epoch, we also show the pre-outburst optical brightening of the progenitor, coincident with the mid-IR source detected in NEOWISE. Error bars are shown at 1σ confidence and 5σ upper limits are shown as symbols with downward arrows.

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