18 Sco - Solar twin

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18 Sco - Solar twin

Post by Sirius_Alpha on 23rd June 2014, 7:04 pm

18 Sco: a solar twin rich in refractory and neutron-capture elements. Implications for chemical tagging
http://arxiv.org/abs/1406.5244

... We use precise HARPS radial velocities to search for planets, but none were detected. ...

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Re: 18 Sco - Solar twin

Post by Stalker on 24th June 2014, 2:07 am

Neutron capture elements... In a main sequence star? O_o

I think I missed something on my readings about nucleosynthesis and stellar evolution...

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Re: 18 Sco - Solar twin

Post by Lazarus on 24th June 2014, 2:29 pm

Planet detection limit is about ~10 Earth masses at 1 day, so definitely room for a set of low-mass planets there. Edge-on Jupiter-clones seem to be ruled out.

Enhancement in refractory elements relative to the Sun might mean more planetary material fell into it?
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