I am a postdoc leading a project X. I have two PhD students directly supervised by me working on this project. They are 'officially' supervised by my professor.
Both these PhD students went to my supervisor (the professor) to have a meeting. I was not asked to join, which felt strange. It turned out that the professor approved both of them to write a paper. They then added another author. When the first draft came out, I was not listed as an author. I talked to one of them to explicitly to ask who are the authors, and she did not name me, even though I had helped her at every stage to set up things in the project.
I complained to the professor and he agreed that this is not acceptable, confirmed that it is my project and I should definitely be an author.
How do I 'reprimand' these two PhD students for not taking appropriate care of authorship and contributions? (a) Having added another author whose contribution is not known to me, (b) Not adding me as an author, (c) not taking me into the loop when considering a publication.
The draft is also in very bad shape, no references, AI-generated text, and missing background research. I am going to stop/delay this publication for now. How do I effectively communicate that without discouraging them entirely?
They plan to submit in a few days.