Bizarre orbits of minor planets beyond Neptune - Ann Marie Madigan(SETI ...
Δημοσιεύτηκε στις 29 Ιαν 2016
The
major planets in our solar system are on nearly circular orbits in a
well-defined disk plane. The minor planets, however, take very different
paths around the sun. Many minor planets are on orbits that tilt 30
degrees or more out of this disk plane; bizarrely, as Dr. Madgian will
describe in the talk, they all tilt the same way!
Theories for
their unusual orbits include the presence of an undetected super-Earth
or 'Planet X' at hundreds of AU, or an encounter with a passing star
which deposited its own minor planets in our outer solar system.
In
this talk, Dr. Madigan will show that these theories are unnecessary,
and that it is the gravitational forces between the minor planets
themselves that result in their unusual orbital properties. Though
individually of low mass, the minor planets together can dictate their
own dynamics. This explanation suggests that there is a (tilted and
highly-inclined) disk of minor planets, at least two orders of magnitude
more massive than the Kuiper Belt awaiting discovery at hundreds of AU.
New surveys such as Pan-STARRS and DECam will soon verify/falsify this
prediction.
major planets in our solar system are on nearly circular orbits in a
well-defined disk plane. The minor planets, however, take very different
paths around the sun. Many minor planets are on orbits that tilt 30
degrees or more out of this disk plane; bizarrely, as Dr. Madgian will
describe in the talk, they all tilt the same way!
Theories for
their unusual orbits include the presence of an undetected super-Earth
or 'Planet X' at hundreds of AU, or an encounter with a passing star
which deposited its own minor planets in our outer solar system.
In
this talk, Dr. Madigan will show that these theories are unnecessary,
and that it is the gravitational forces between the minor planets
themselves that result in their unusual orbital properties. Though
individually of low mass, the minor planets together can dictate their
own dynamics. This explanation suggests that there is a (tilted and
highly-inclined) disk of minor planets, at least two orders of magnitude
more massive than the Kuiper Belt awaiting discovery at hundreds of AU.
New surveys such as Pan-STARRS and DECam will soon verify/falsify this
prediction.
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