# How many times can iron be detected for the first time in an exoplanetary atmosphere?

I see today that there's a story about the first detection of iron in an exoplanetary atmosphere, in this case in the atmosphere of the ultra-hot Jupiter KELT-9b.

I remember there being a story a couple of months ago about the detection of iron rain in an exoplanetary atmosphere, the example being another ultra-hot Jupiter, WASP-76b.

It doesn't seem plausible for both of these to be the first detection of iron in an exoplanetary atmosphere. So which one is it?

In other words, I think the spaceref.com article is playing fast and loose with its wording - Pino et al.'s results don't constitute the first time iron has been detected in an exoplanet atmosphere, just the first time iron emission lines have been detected. They got around that by characterizing emission lines as "direct"$$^{\dagger}$$, implying absorption lines are "indirect". Whether you agree with that is up to you, I think.
$$^{\dagger}$$Hoeijmakers et al. refer to their observations as the first "direct detection" of iron, adding a layer of complexity and irony.