Stars came out of my pokeball when I caught my Pokemon what does that mean?

That just means you've caught it, so it's a good thing. ^_^

I was wondering the same thing. It just started happening the past few days and I can't figure out what these stars shooting out mean and I've played since the beginning so I know what things should look like. It's not your standard ring that comes out with a regular capture. Ive looking online for other references to it but your comment was all I could find. If anyone knows what it is I would be very interested

I believe it's a critical capture. Instead of the ball shaking 3 times to catch a pokemon. It only shakes once

There are now “Critical Captures” in the game, where you will sometimes snag an instant Pokémon catch on a single shake, which is something pulled from the handheld game. What causes Critical Captures has not been exactly determined, but it could be the capture bonuses provided by medals.

Search "critical capture" and there are a few hits associated with Pokemon go.

U get star dust that means I got 2,000

I have experienced the same thing with a staru.

It happens when you catch a 100% iv Pokémon.