Evidence item

Phys.org describes the cooler-than-maximum dayside as evidence for an atmosphere and explains the inference via reflective clouds. MEASUREMENT

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Source: Coolest lava world yet with signs of an atmosphere offers clues to early Earth · locator {} · excerpt hash sha256:8a27f59dc32da16dfe962e5be6e42256faf8cb84a84772768222024aa31b12b6

If a planet has an atmosphere, it might also have clouds that reflect incoming starlight and cool the dayside. So if a planet's dayside is cooler than the maximum possible, it likely has an atmosphere. The subject of the study, HD 3167 b, is noticeably cooler than its expected maximum, providing strong evidence that it has an atmosphere.