BD+20 594 b - a Neptune-mass pure rock planet?

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BD+20 594 b - a Neptune-mass pure rock planet?

Post by Sirius_Alpha on 28th January 2016, 9:58 pm

A Neptune-sized Exoplanet Consistent with a Pure Rock Composition
http://arxiv.org/abs/1601.07608

We report the discovery of BD+20594b, a Neptune-sized exoplanet consistent with a pure rock composition, made using photometry from Campaign 4 of the two-wheeled Kepler (K2) mission. The host star is a bright (V=11.04, Ks=9.37), slightly metal poor ([Fe/H]=−0.150.05 dex) solar analogue located at 152.1+9.7−7.4 pc from Earth, for which we find a radius of R∗=0.928+0.055−0.040R⊙ and a mass of M∗=0.961+0.032−0.029M⊙. A joint analysis of the K2 photometry and HARPS radial velocities reveal that the planet is in a ≈42 day orbit around its host star, has a radius of 2.23+0.14−0.11R⊕, and a mass of 16.3+6.0−6.1M⊕. The data at hand are most consistent with a pure rock composition with a low volatile content, potentially making it a rare exception among Neptune-sized exoplanets discovered so far.

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Re: BD+20 594 b - a Neptune-mass pure rock planet?

Post by tommi59 on 29th January 2016, 6:13 am

Good news after hesitation with mass of k 10 c.We have planet which has low insolation and could not loose its envelope so it never had it. All parameters strikingly similar to k 10 c. I expect we will find small % of such planet among volatile rich.
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Re: BD+20 594 b - a Neptune-mass pure rock planet?

Post by tommi59 on 29th January 2016, 8:58 am

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Re: BD+20 594 b - a Neptune-mass pure rock planet?

Post by Lazarus on 29th January 2016, 1:39 pm

The error bars still allow for substantial volatile content in the planet (see figure 8), especially if the planet has a metallic core in addition to the rocky component. Still, interesting discovery!

As regards Kepler-131b, the mass estimate is not in tommi59's link - but according to Marcy et al. (2014) the mass is 16.133.5 MEarth. The lower radius of 2.17 REarth versus 2.410.20 REarth in Marcy et al. (2014) would push the density up somewhat from the value there.
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Re: BD+20 594 b - a Neptune-mass pure rock planet?

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