Home » News & Blogs » Dwarf Planets to Low-Mass Stars
Bookmark and Share
Beyond Earthly Skies

Dwarf Planets to Low-Mass Stars

6 Jul 2016, 22:00 UTC
Dwarf Planets to Low-Mass Stars
(200 words excerpt, click title or image to see full post)

Figure 1: Artist's impression of an exoplanet.Mass and radius are two of the most important properties that define a planet. However, in the effort to detect planets, usually only the mass or radius of the planet is measured. As a result, there is a need to predict a planet's radius based on its mass or a planet's mass based on its radius. Chen & Kipping (2016) present a forecasting model based on a probabilistic mass-radius relation from a sample of 316 objects with well-constrained masses and radii. The objects span nine orders-of-magnitude in mass, from dwarf planets to low-mass stars. They are classified into 4 classes - Terran worlds (i.e. Earth is in this category), Neptunian worlds, Jovian worlds and stars. With this classification, dwarf planets are simply low-mass Terran worlds and brown dwarfs are simply high-mass Jovian worlds.In the model by Chen & Kipping (2016), there is a transition in the mass-radius relation at ~2.0 times the mass of Earth. This transition marks the divide between solid Terran worlds and gas-rich Neptunian worlds. What this means for solid Super-Earths is that they are expected to have masses not much greater than the mass of Earth (i.e. within ~2.0 times ...

Latest Vodcast

Latest Podcast

Advertise PTTU

NASA Picture of the Day

Astronomy Picture of the Day