HD 6434 - A 20-day Saturn (and a Long Period Planet?)

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HD 6434 - A 20-day Saturn (and a Long Period Planet?)

Post by Sirius_Alpha on 10th October 2015, 4:02 pm

HD 6434 b has been known for a long time (Mayor et al. 2003). Further RV monitoring has revealed a trend indicative of the presence of a long-period companion. There's also a transit non-detection reported here.

A New Analysis of the Exoplanet Hosting System HD 6434
http://arxiv.org/abs/1510.01746

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Re: HD 6434 - A 20-day Saturn (and a Long Period Planet?)

Post by Edasich on 11th October 2015, 5:22 am

Preliminary astrometric measurements seem to infer a mass above substellar domain and a nearly face-on orbit. In case of stellar nature for HD 6434 b it would be interesting to confirm and ascertain the presence of additional companion that could even turn out a circumbinary (substellar?) object.
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Re: HD 6434 - A 20-day Saturn (and a Long Period Planet?)

Post by Sirius_Alpha on 11th October 2015, 11:51 am

If it's the case where HD 6434 b is a stellar object, and the long-period companion is a substellar object, then there should be a significant mismatch between their orbit inclinations ... which might not be that big of an issue considering the separation of the outer component.

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Re: HD 6434 - A 20-day Saturn (and a Long Period Planet?)

Post by Edasich on 12th October 2015, 3:47 am

Indeed it would be interesting to investigate more about Rho CrB system which has been discarded too quickly. If former planet candidate "b" is actually a low-mass star additional trend may hint the presence of additional companions even in close orbits. When I had got Systemic Console working I and other users have detected additional planet(s)...
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Re: HD 6434 - A 20-day Saturn (and a Long Period Planet?)

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