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Updated: Sep 10, 2025
09:44
Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
Published on: June 5, 2014
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A young gas giant and hidden substructures in a protoplanetary disk.
Álvaro Ribas1, Miguel Vioque2, Francesco Zagaria3
1Institute of Astronomy, University of Cambridge, Cambridge, UK.
Nature Astronomy
|August 21, 2025
Summary
Astronomers indirectly detected an exoplanet in the MP Mus protoplanetary disk using Gaia astrometry and ALMA observations. This finding suggests planet formation might be more common in such disks than previously assumed.
Area of Science:
- Exoplanetary science
- Astrophysics
- Planet formation
Background:
- Detecting planets in protoplanetary disks is challenging.
- Rings and gaps are common in protoplanetary disks, indicating planet-disk interactions.
- MP Mus (PDS 66) disk appears smooth, contradicting its age and expected substructures.
Purpose of the Study:
- To investigate the apparent lack of substructures in the MP Mus protoplanetary disk.
- To identify the cause of a proper motion anomaly detected in MP Mus using Gaia data.
- To indirectly detect an exoplanet within the MP Mus disk.
Main Methods:
- Conducted high-resolution Atacama Large Millimeter/submillimeter Array (ALMA) 3-mm observations.
- Analyzed Gaia astrometry data for proper motion anomalies.
- Utilized hydrodynamic simulations to model planet-disk interactions.
Main Results:
- Revealed an inner cavity (<3 AU) and a ring (10 AU) in the MP Mus disk.
- Constrained the companion's properties to a gas giant orbiting at 1-3 AU.
- Confirmed that a planet of this size can create the observed cavity.
Conclusions:
- Provided compelling indirect evidence for an exoplanet in the MP Mus disk.
- Suggests that dust substructures, and thus planet formation, may be more prevalent in protoplanetary disks than previously thought.
- Highlights the synergy of combining astrometric and millimeter-wave observations for exoplanet detection.
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