You will need to check what is available publicly on https://firefly.adobe.com. You need to check the copyright notice. I assume that you can use those for your research, but I didn't check.
You could also write a snail mail to Adobe. By detailing your project it may well be, that you will get more support from Adobe on this. But I don't talk for Adobe, and I do nothing about their policies in this regard.
ABAMBO | Hard- and Software Engineer | Photographer