T Tauri star

Jupiter (rocket family)

Protoplanet

Computer security

RADIUS

Astrophysics

Space Shuttle

Computer science

Circumstellar disk

Classical mechanics

Circumstellar dust

Physics

Planetary system

Astronomy

Protoplanetary disk

Kinematics

Planet

Giant planet

Stars

The Astrophysical Journal

Disks of gas and dust surrounding young stars are the birthplace of planets. However, the direct detection of protoplanets forming within disks has proved elusive to date. We present the detection of a large, localized deviation from Keplerian velocity in the protoplanetary disk surrounding the young star HD 163296. The observed velocity pattern is consistent with the dynamical effect of a two-Jupiter-mass planet orbiting at a radius ≈260 au from the star.

Kinematic Evidence for an Embedded Protoplanet in a Circumstellar Disk