Searching for Planet Nine
Some astronomers think this alleged planet, called Planet Nine, exists because of the way some objects in space, called “Trans-Neptunian Objects,” or TNOs, behave. These TNOs are rocky objects smaller than Pluto that orbit the sun at a greater average distance than Neptune. But the orbits of the most distant of these TNOs—those whose average distance from the sun is more than 250 times as far as Earth’s distance—seem to point in the same direction. This observation first led astronomers to predict the existence of Planet Nine.
For these TNOs to be aligned in the orbits they currently occupy because of Planet Nine’s influence, astronomers say, they would have been in the solar system for longer than a billion years. However, some astronomers think in that amount of time, some of these objects should have either smashed into another planet, been thrown into the sun, or ricocheted off into space by other planets’ gravitational force.Artist’s concept of the “Planet Nine”.
Image credit: NASA/JPL-Caltech/Robert Hurt
In each individual simulation, the researchers tested different versions of Planet Nine to see whether that version of the planet, with its gravitational forces, resulted in the same version of the solar system we see today.
“From that set of simulations, we found out that there are preferred versions of Planet Nine that make the TNO stay stable for longer, so it basically increases the probability that our solar system exists the way it does,” Becker said. “Through these computer simulations, we were able to determine which realization of Planet Nine creates our solar system—the whole caveat here being, if Planet Nine is real.”
The group, which includes U-M physics professors David Gerdes and Fred Adams as well as graduate student Stephanie Hamilton and undergraduate Tali Khain, also examined the resonance of these TNOs with Planet Nine. An orbital resonance occurs when objects in a system periodically exert gravitational forces upon each other that cause the objects to line up in a pattern.
In this case, the researchers found that occasionally, Neptune will bump a TNO out of its orbital resonance, but instead of sending that TNO skittering into the sun, out of the solar system or into another planet, something catches that TNO and confines it into a different resonance.
“The ultimate goal would be to directly see Planet Nine—to take a telescope, point it at the sky, and see reflected light from the sun bouncing off of Planet Nine,” Becker said. “Since we haven’t yet been able to find it, despite many people looking, we’re stuck with these kinds of indirect methods.”
Astronomers also have another newly discovered TNO to include in their indirect methods of detecting Planet Nine. The Dark Energy Survey collaboration, a large group of scientists including several U-M scientists, has discovered another TNO that has a high orbital inclination compared to the plane of the solar system: it is tilted about 54 degrees relative to the solar system’s plane.
In an analysis of this new object, Becker and her team have found that this object experiences resonance hopping as well in the presence of Planet Nine, showing that this phenomenon extends to even more unusual orbits.
This work was supported by National Science Foundation. Becker and Hamilton are also supported by the NSF Graduate Research Fellowship Grant.
Contacts and sources:
Juliette Becker / Morgan Sherburne
University of Michigan
Source: http://www.ineffableisland.com/2017/10/searching-for-planet-nine.html
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