Mass, radius, and composition of the transiting planet 55 Cnc e : using interferometry and correlations --- A quick update

Abstract

In a recent paper (Crida et al. 2018, accepted on April 19), we presented a method to derive the mass and radius of a transiting exoplanet and their intrinsic correlation, that we applied to 55 Cnc e. We wrote: "More precise observations of the transit would be very useful in this particular case and would allow to increase significantly the gain on the planetary density precision." Three months later, Bourrier et al. (2018) published new observations of the system. Additionally, Gaia's DR2 was released on April 25, 2018. The purpose of this research note is solely to implement these precise new data in our pipeline to provide an up-to-date result of our model. We find $R_p=1.947\pm 0.038R_{\oplus }$ and $M_p=8.59\pm 0.43M_{\oplus }$. We also double the precision on the planetary density (${\rho }_p=1.164\pm 0.062{\rho }_{\oplus }$), which allows us to refine the estimates for all interior parameters of interest. In particular, we now find that the radius of the gaseous envelope is $0.03\pm 0.02R_p$.

arXiv comment3 pages, 1 figure, published in Research Notes of the American Astronomical Society

References in corpus (6)

• The Gaia mission
• On the Unique Solution of Planet and Star Parameters from an Extrasolar Planet Transit Light Curve
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• Radii, masses, and ages of 18 bright stars using interferometry and new estimations of exoplanetary parameters
• Mass, radius, and composition of the transiting planet 55 Cnc e : using interferometry and correlations

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• Directly Determined Properties of HD 97658 from Interferometric Observations
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