Volume 587, March 2016
|Number of page(s)||4|
|Published online||08 March 2016|
Constraints on the location of a possible 9th planet derived from the Cassini data
GéoAzur, CNRS-UMR 7329, Observatoire de la Côte d’Azur, Université
Nice Sophia Antipolis, 250 Av. A.
2 ASD/IMCCE, CNRS-UMR 8028, Observatoire de Paris, PSL, UPMC, 77 avenue Denfert-Rochereau, 75014 Paris, France
Received: 31 January 2016
Accepted: 16 February 2016
To explain the unusual distribution of Kuiper belt objects, several authors have advocated the existence of a super-Earth planet in the outer solar system. It has recently been proposed that a 10 M⊕ object with an orbit of 700 AU semi major axis and 0.6 eccentricity can explain the observed distribution of Kuiper belt objects around Sedna. Here we use the INPOP planetary ephemerides model as a sensor for testing for an additional body in the solar system. We test the possibility of adding the proposed planet without increasing the residuals of the planetary ephemerides, fitted over the whole INPOP planetary data sample. We demonstrate that the presence of such an object is not compatible with the most sensitive data set, the Cassini radio ranging data, if its true anomaly is in the intervals [−130°: −100° ] or [−65°:85° ]. Moreover, we find that the addition of this object can reduce the Cassini residuals, with a most probable position given by a true anomaly v = 117.8°+11°-10° .
Key words: Kuiper belt: general / planets and satellites: detection
© ESO, 2016
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