My (probably) last co-authorship paper from grad school is out!!
The long story short is, any evidence for Planet Nine is gone. It doesn't exist.
This is the most comprehensive study EVER that examines the original clustering argument, led by @kjnapes. Let's get into it!
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First, some background.
In 2014, astronomers Scott Sheppard and Chad Trujillo noted a weird clustering in the orbital elements of the most distant Kuiper Belt Objects they'd found. They hypothesized sorta in passing that a new planet could be responsible.
Enter Batygin & Brown
Mike Brown & Konstantin Batygin originally set out to DISPROVE the new planet hypothesis!
But instead, their simulations suggested a new planet, & even predicted its properties!
The resulting paper set off the biggest planetary debate of the century since Pluto's demotion.
What's the debate?
Well, the argument for the last five years has all centered around the fact that you find objects where you look in the sky.
No surprise there, right?
This problem is complicated though, because the objects we're talking about have some of the most distant and elongated orbits of all the objects in the solar system.
We only find them when they're closest to the Sun, when they're at their brightest.
