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Astronomers Capture Planet Formation in Action in Two Young Star Systems

These discoveries confirm theoretical models by showing a giant protoplanet carving spiral arms in HD 135344B’s disk; they also reveal high-temperature mineral condensation that marks the t=0 moment of planetesimal growth in HOPS-315

Astronomers believe the spiral disk in this photograph may be evidence of a planet forming around the young star HD 135344B. The location of this potential planet is indicated with a white circle. The central black circle corresponds to a coronagraph — a device that blocks the star's light to reveal details around it.
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Overview

  • VLT’s new ERIS instrument directly imaged a protoplanet candidate twice the mass of Jupiter embedded at the base of a spiral arm in HD 135344B’s disk, confirming models of planet-driven disk structures.
  • Francesco Maio’s team detected light from the embedded object in near-infrared, providing the first unambiguous view of a forming planet sculpting its natal disk.
  • JWST observations identified crystalline minerals in hot SiO gas around HOPS-315 and subsequent ALMA mapping traced their condensation into solids, marking the initial stage of planetesimal assembly.
  • Lead author Melissa McClure found that the refractory solids forming in HOPS-315 mirror those in our own Solar System’s early meteorites, linking extraterrestrial findings to terrestrial origins.
  • By uniting direct imaging and spectroscopic data across multiple wavelengths, these studies bridge decades of disk surveys and validate core accretion theories across both macroscopic and microscopic scales.