The jury is still out on Arcturus' hypothetical companion. Information is far from complete. The companion could be a small star/large gas giant at close distance to Arcturus, that is not detectable with currently available techniques.The question: How can there be multiple lines of evidence that Arcturus is curving through space, yet no evidence of anything for it to curve around?
from:Hatzes and Cochran postulated in 2009 the presence of a massive companion planet to explain radial velocity variations, though radial pulsations can also produce similar variations. Such a substellar object would yield nearly 12 times the mass of Jupiter and be located close to Earth’s orbital zone, at 1.1 astronomical units. So far the planet has not been confirmed or retracted.
The authors are ruling out certain parameters based upon the conventional ideas of stellar evolution, ie the stars were formed at the same time and have had similar evolutions.A companion of similar spectral type and 4–8L⊙ can
only be a red (sub-)giant of slightly lower initial mass than
Arcturus. Note that a higher mass is not possible because
of evolutionary reasons: in such case, the companion would
have been much brighter than the primary, under the assumption
that they are coeval.
Lloyd wrote:* Celeste, are you suggesting that Arcturus is spiraling around magnetic field lines, the way particles do? I haven't heard of that idea before myself. The largest object I find in net searches that spiral around magnetic field lines are ions. If you've read that stars etc can do that, I'd like to see your source.
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