Planetary Companions reported around Bet Cnc, Mu Leo, Bet UMi and Sig Per.

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Planetary Companions reported around Bet Cnc, Mu Leo, Bet UMi and Sig Per.

Post by Sirius_Alpha on 11th May 2014, 9:34 pm

Planetary companions in K giants beta Cancri, mu Leonis, and beta Ursae Minoris
http://arxiv.org/abs/1405.2127

Planetary companion in K giant Sigma Persei
http://arxiv.org/abs/1405.2130

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Re: Planetary Companions reported around Bet Cnc, Mu Leo, Bet UMi and Sig Per.

Post by Edasich on 12th May 2014, 3:44 am

When I had got old Systemic Console I had detected a substellar companion to Beta UMi with similar parameters, though with higher minimum mass.
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Re: Planetary Companions reported around Bet Cnc, Mu Leo, Bet UMi and Sig Per.

Post by Stalker on 12th May 2014, 4:35 am

beta Cancri and beta Ursae Minoris are Barium stars.

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Re: Planetary Companions reported around Bet Cnc, Mu Leo, Bet UMi and Sig Per.

Post by Shellface on 12th May 2014, 4:09 pm

Mu Leonis I recognise as one of the few well-characterised super metal-rich (Fe/H = 0.3) giants.

Edasich wrote:When I had got old Systemic Console I had detected a substellar companion to Beta UMi with similar parameters, though with higher minimum mass.
Were you using a higher mass for the star? Wikipedia among other places list ~2 M, while this paper uses 1.4 M.

Stalker wrote:beta Cancri  and beta Ursae Minoris are Barium stars.
This part is pretty interesting - pollution by mass accretion seems to be the only way for barium stars to form, which implies that all barium stars have degenerate companions at short-to-moderate separations. I wonder how that applies here.

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Re: Planetary Companions reported around Bet Cnc, Mu Leo, Bet UMi and Sig Per.

Post by Stalker on 12th May 2014, 4:17 pm

None of them have a detectable degenerate companions.

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Re: Planetary Companions reported around Bet Cnc, Mu Leo, Bet UMi and Sig Per.

Post by Edasich on 13th May 2014, 3:36 am

Stalker wrote:None of them have a detectable degenerate companions.

Unless future imaging campaigns or astrometric measurements of substellar candidates detect them.
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Re: Planetary Companions reported around Bet Cnc, Mu Leo, Bet UMi and Sig Per.

Post by Stalker on 13th May 2014, 9:24 am

beta Cancri have a M dwarf wide companion.

I think the white dwarfs might be detected along with this exoplanets...

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Re: Planetary Companions reported around Bet Cnc, Mu Leo, Bet UMi and Sig Per.

Post by Lazarus on 13th May 2014, 11:19 am

Ursa Minor Beta is a well-known place for Hitchhiker's Guide to the Galaxy fans.

Now need to figure out where I can get a Pan-Galactic Gargle Blaster to celebrate...
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Re: Planetary Companions reported around Bet Cnc, Mu Leo, Bet UMi and Sig Per.

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