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If I can dream... may be fools dreams...
1) Our planet has many and much chemical elements that should be produced by nova/supernova.
The binary system is more common than single star system.
Would it be the remains from nova or supernova of a companion star, as cold dwarf star ? Is it possible with only 4.5 billions of years (age of our sun) ? It seems to be few time to let proto-Earth catch those chemical elements.
2) Our Solar System did 22 tour around our galaxy. Many stars or bodies could be near us during this time. Could it be a captured body ? It seems to me a too long orbit for planet.
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