Pulsar limits on "Planet X"

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Pulsar limits on "Planet X"

Post by Lazarus on 13th August 2008, 12:05 pm

Aside from providing the most accurate distance to a pulsar and providing constraints on alternative theories of gravity with varying G, measurements of PSR J0437-4715 allow strong limits to be placed on any "Planet X" in the outer solar system: Uranus-mass planets are excluded to 50 AU and Jupiter-mass planets to 226 AU at 95% confidence over 50% of the sky.

Extremely high precision VLBI astrometry of PSR J0437-4715 and implications for theories of gravity

(Of course we should remember that the "X" stands for unknown, not the Roman numeral for 10, so calling it "Planet X" is still ok in these post-Eris times...)
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Re: Pulsar limits on "Planet X"

Post by Sirius_Alpha on 13th August 2008, 3:18 pm

Let me see if I got this right from the abstract...

They measured movement of the Sol system, relative to PSR J0437-4715, through pulsar timing? If so, this makes sense. And so... it's sort of like a radial velocity measurement of Sol?

Or did I completely misunderstand?

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