MASS-RADIUS RELATIONSHIPS FOR EXOPLANETS

The Mass-radius Relation for 65 Exoplanets Smaller than 4 Earth Radii

We study the masses and radii of 65 exoplanets smaller than 4R⊕ with orbital periods shorter than 100 days. We calculate the weighted mean densities of planets in bins of 0.5 R⊕ and identify a density maximum of 7.6 g cm−3at 1.4 R⊕. On average, planets with radii up to RP = 1.5R⊕ increase in density with increasing radius. Above 1.5 R⊕, the average planet density rapidly decreases with increasi...

Ocean Planet or Thick Atmosphere: on the Mass-radius Relationship for Solid Exoplanets with Massive Atmospheres

The bulk composition of an exoplanet is commonly inferred from its average density. For small planets, however, the average density is not unique within the range of compositions. Variations of a number of important planetary parameters—which are difficult or impossible to constrain from measurements alone—produce planets with the same average densities but widely varying bulk compositions. We ...

Radius Mass Position of Radius

A Computational Tool to Interpret the Bulk Composition of Solid Exoplanets based on Mass and Radius Measurements

The prospects for finding transiting exoplanets in the range of a few to 20 M⊕ is growing rapidly with both ground-based and spaced-based efforts. We describe a publically availalble computer code to compute and quantify the compositional ambiguities for differentiated solid exoplanets with a measured mass and radius, including the mass and radius uncertainties.

Radius-mass Scaling Laws for Celestial Bodies

In this letter we establish a connection between two-exponent radius-mass power laws for cosmic objects and previously proposed two-exponent Regge-like spin-mass relations. A new, simplest method for establishing the coordinates of Chandrasekhar and Eddington points is proposed. In previous papers [2],[3] Muradian has suggested the two-exponent Regge-like relation J = ¯ h m m p 1+1/n (1) betwee...