Back to Search
Start Over
TW Hya: an old protoplanetary disc revived by its planet
- Publication Year :
- 2020
-
Abstract
- Dark rings with bright rims are the indirect signposts of planets embedded in protoplanetary discs. In a recent first, an azimuthally elongated AU-scale blob, possibly a planet, was resolved with ALMA in TW Hya. The blob is at the edge of a cliff-like rollover in the dust disc rather than inside a dark ring. Here we build time-dependent models of TW Hya disc. We find that the classical paradigm cannot account for the morphology of the disc and the blob. We propose that ALMA-discovered blob hides a Neptune mass planet losing gas and dust. We show that radial drift of mm-sized dust particles naturally explains why the blob is located on the edge of the dust disc. Dust particles leaving the planet perform a characteristic U-turn relative to it, producing an azimuthally elongated blob-like emission feature. This scenario also explains why a 10 Myr old disc is so bright in dust continuum. Two scenarios for the dust-losing planet are presented. In the first, a dusty pre-runaway gas envelope of about 40 Earth mass Core Accretion planet is disrupted, e.g., as a result of a catastrophic encounter. In the second, a massive dusty pre-collapse gas giant planet formed by Gravitational Instability is disrupted by the energy released in its massive core. Future modelling may discriminate between these scenarios and allow us to study planet formation in an entirely new way -- by analysing the flows of dust and gas recently belonging to planets, informing us about the structure of pre-disruption planetary envelopes.<br />Comment: Typos fixed, references and author list updated
- Subjects :
- Gravitational instability
Gas giant
530 Physics
Dust particles
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
1912 Space and Planetary Science
Neptune
Planet
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
Earth and Planetary Astrophysics (astro-ph.EP)
Physics
010308 nuclear & particles physics
Astronomy
Astronomy and Astrophysics
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Protoplanetary disc
Space and Planetary Science
10231 Institute for Computational Science
3103 Astronomy and Astrophysics
Astrophysics::Earth and Planetary Astrophysics
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....8c1ee9dc0aa1c3d5eb5ca7c9c08fc508