SIMBAD references

2014ApJ...783L...6W - Astrophys. J., 783, L6 (2014/March-1)

The mass-radius relation for 65 exoplanets smaller than 4 earth radii.


Abstract (from CDS):

We study the masses and radii of 65 exoplanets smaller than 4 R with orbital periods shorter than 100 days. We calculate the weighted mean densities of planets in bins of 0.5 Rand identify a density maximum of 7.6 g/cm3 at 1.4 R. On average, planets with radii up to RP= 1.5 Rincrease in density with increasing radius. Above 1.5 R, the average planet density rapidly decreases with increasing radius, indicating that these planets have a large fraction of volatiles by volume overlying a rocky core. Including the solar system terrestrial planets with the exoplanets below 1.5 R, we find ρP= 2.43 + 3.39(RP/R) g/cm3 for RP< 1.5 R, which is consistent with rocky compositions. For 1.5 ≤ RP/R< 4, we find MP/M= 2.69(RP/R)0.93. The rms of planet masses to the fit between 1.5 and 4 Ris 4.3 Mwith reduced χ2 = 6.2. The large scatter indicates a diversity in planet composition at a given radius. The compositional diversity can be due to planets of a given volume (as determined by their large H/He envelopes) containing rocky cores of different masses or compositions.

Abstract Copyright:

Journal keyword(s): planets and satellites: composition - planets and satellites: fundamental parameters - planets and satellites: gaseous planets - planets and satellites: general - planets and satellites: terrestrial planets

Simbad objects: 66

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