A search for Planet 9 in the IRAS data

Abstract

I have carried out a search for Planet 9 in the IRAS data. At the distance range proposed for Planet 9, the signature would be a 60 micron unidentified IRAS point source with an associated nearby source from the IRAS Reject File of sources which received only a single hours-confirmed (HCON) detection. The confirmed source should be detected on the first two HCON passes, but not on the third, while the single HCON should be detected only on the third HCON. I have examined the unidentified sources in three IRAS 60micron catalogues: some can be identified with 2MASS galaxies, Galactic sources or as cirrus. The remaining unidentified sources have been examined with the IRSA Scanpi tool to check for the signature missing HCONs, and for association with IRAS Reject File single HCONs. No matches of interest survive. For a lower mass planet (< 5 earth masses) in the distance range 200-400 AU, we expect a pair or triplet of single HCONs with separations 2-35 arcmin. Several hundred candidate associations are found and have been examined with Scanpi. A single candidate for Planet 9 survives which satisfies the requirements for detected and non-detected HCON passes. A fitted orbit suggest a distance of 225+-15 AU and a mass of 3-5 earth masses. Dynamical simulations are needed to explore whether the candidate is consistent with existing planet ephemerides. If so, a search in an annulus of radius 2.5-4 deg centred on the 1983 position at visible and near infrared wavelengths would be worthwhile.

12 pages, 13 figures. Accepted for publication in MNRAS

References in corpus (6)

• The Planet Nine Hypothesis
• Constraints on Planet Nine's Orbit and Sky Position within a Framework of Mean Motion Resonances
• Orbital clustering in the distant solar system
• Comprehensive Wide-Band Magnitudes and Albedos for the Planets, With Applications to Exo-Planets and Planet Nine
• Searching for Planet Nine with Coadded WISE and NEOWISE-Reactivation Images
• The orbit of Planet Nine

Cited by in corpus (7)

• unTimely: a Full-sky, Time-Domain unWISE Catalog
• On the origin of extreme trans-Neptunian objects within Modified Newtonian Dynamics
• Searching for giant planets in the outer Solar System with far-infrared all-sky surveys
• A Search for Planet Nine with IRAS and AKARI Data
• Prospects for localising Planet 9 with a future Uranus mission
• Rebuilding the Habitable Zone from the Bottom Up with Computational Zones
• A Far-Infrared Search for Planet Nine Using AKARI All-Sky Survey