Science and Exploration

Are There Large Planets Beyond Pluto?

By Keith Cowing
June 16, 2014
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Are There Large Planets Beyond Pluto?
Transneptunian Planet

The existence of an outer planet beyond Pluto has been a matter of debate for decades and the recent discovery of 2012 VP113 has just revived the interest for this controversial topic.
This Sedna-like object has the most distant perihelion of any known minor planet and the value of its argument of perihelion is close to 0 degrees. This property appears to be shared by almost all known asteroids with semimajor axis greater than 150 au and perihelion greater than 30 au (the extreme trans-Neptunian objects or ETNOs), and this fact has been interpreted as evidence for the existence of a super-Earth at 250 au. In this scenario, a population of stable asteroids may be shepherded by a distant, undiscovered planet larger than the Earth that keeps the value of their argument of perihelion librating around 0 degrees as a result of the Kozai mechanism.

Here, we study the visibility of these ETNOs and confirm that the observed excess of objects reaching perihelion near the ascending node cannot be explained in terms of any observational biases. This excess must be a true feature of this population and its possible origin is explored in the framework of the Kozai effect. The analysis of several possible scenarios strongly suggest that at least two trans-Plutonian planets must exist.

Extreme trans-Neptunian objects and the Kozai mechanism: signaling the presence of trans-Plutonian planets?

C. de la Fuente Marcos, R. de la Fuente Marcos (Submitted on 3 Jun 2014)

Comments: 7 pages, 6 figures, 2 tables. The resolution of Fig. 1 has been reduced to comply with file size-restrictions. Accepted for publication in MNRAS: Letters

Subjects: Earth and Planetary Astrophysics (astro-ph.EP)

Cite as: arXiv:1406.0715 [astro-ph.EP] (or arXiv:1406.0715v1 [astro-ph.EP] for this version)

Submission history From: Raul de la Fuente Marcos [v1] Tue, 3 Jun 2014 13:59:10 GMT (1392kb)

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