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ROXs 42Bb is a directly imaged planetary-mass companion [1] to the binary M star ROXs 42B, [4] a likely member of the Rho Ophiuchi cloud complex. The companion was announced/discovered on October 17, 2013, by University of Toronto astronomer Thayne Currie .
The planet is calculated to have an accretion rate up to 10 −8 M ☉ per year assuming a planetary mass of 15 M Jup, which would correspond to a planetary radius of 0.13 R ☉ based on evolutionary tracks. [18] Thus, HD 100546 c is either in a relatively quiescent stage or its growth from accretion is at a low level or has already ceased. [18]
The sizes are listed in units of Jupiter radii (R J, 71 492 km).This list is designed to include all planets that are larger than 1.6 times the size of Jupiter.Some well-known planets that are smaller than 1.6 R J (17.93 R 🜨 or 114 387.2 km) have been included for the sake of comparison.
Kepler-36b and c have semi-major axes of 0.1153 AU and 0.1283 AU, respectively; hence the planet c is 1.11 times further from star than b. There have been unconfirmed detections of co-orbital pairs of exoplanet, each of which has a semi-major axis ratio of almost 1. Largest semi-major axis ratio between consecutive planets HD 83443 b and HD 83443 c
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For a disk only made of 1 μm grains, it would have a dust mass of 0.054 M E (4.4 M L). The disk also contains gas, as is indicated by the accretion of hydrogen, with the gas mass being on the order of 0.03 M J (about 9.5 M E ).