HD 147379 b - temperate super-Neptune around an M0 dwarf

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HD 147379 b - temperate super-Neptune around an M0 dwarf

Post by Lazarus on 7th December 2017, 1:45 pm

Reiners et al. (2017) "The CARMENES search for exoplanets around M dwarfs: HD 147379 b: A nearby Neptune in the temperate zone of an early-M dwarf"
https://www.aanda.org/articles/aa/pdf/forth/aa32165-17.pdf

The star is part of a common proper motion binary, the secondary is EW Draconis. The planet HD 147379 b has minimum mass of about 25 Earth masses.
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Re: HD 147379 b - temperate super-Neptune around an M0 dwarf

Post by Sirius_Alpha on 18th December 2017, 10:39 pm


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Re: HD 147379 b - temperate super-Neptune around an M0 dwarf

Post by Sirius_Alpha on 31st January 2018, 10:22 pm

An improved quantification of HD 147379 b
https://arxiv.org/abs/1801.10541

We reanalyze the CARMENES and HIRES/KECK radial velocity data for HD 147379, and also analyze the SOPHIE data using the Agatha software in combination with MCMC posterior sampling. The analysis confirms the existence of HD 147379 b and improves the parameter estimation through modeling of red noise. The multiple radial velocity data sets for HD147379 provide a benchmark case for RV data analyses. Based on our analysis of the HD 147379 data, CARMENES radial velocity data is dominated by red noise and thus need to incorporate a red noise model.

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Re: HD 147379 b - temperate super-Neptune around an M0 dwarf

Post by Lazarus on 1st February 2018, 2:14 pm

angular parameters ranging from 0 to 2π
Well obviously if the eccentricity is not significantly detected then the argument of periastron ω is going to be pretty much undefined and so will mean anomaly M (which essentially measures time since periastron). Nevertheless there are better ways to characterise the phase of the RV curve, mean longitude (M+ω) is probably going to be far better constrained.

Having worked on the Open Exoplanets Catalogue, it's amazing how many papers just go ahead and quote mean anomaly (or the equivalent time-domain value Tperiastron) without considering whether that is actually an appropriate measure for characterising low-eccentricity orbits.
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Re: HD 147379 b - temperate super-Neptune around an M0 dwarf

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