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arXiv:1510.03097v4[astro-ph.EP]21Oct2015
Periodic mass extinctions and the Planet X
model reconsidered
Daniel P. Whitmire
...
assumed the companion was a sub-stellar object with a mass between 0.07 M⊙
and 2 × 10−4
M⊙. The lower end of this mass ran...
now been observed around some young stars. In this case the mass of Planet X
could be lower, ∼ 1 M⊕, since it need not hav...
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