Led_Zep SuperJovian
Number of posts : 721 Location : France Registration date : 2011-09-09
| Subject: Planet-forming disc around the nearby Sun-like star TW Hydrae 31st March 2016, 5:21 pm | |
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Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: Re: Planet-forming disc around the nearby Sun-like star TW Hydrae 31st March 2016, 8:24 pm | |
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tommi59 Jovian
Number of posts : 596 Age : 46 Location : Baile Atha Cliath Registration date : 2010-07-31
| Subject: Icy giant planet growing around a nearby star 15th September 2016, 4:34 pm | |
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Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: Re: Planet-forming disc around the nearby Sun-like star TW Hydrae 21st April 2020, 8:41 pm | |
| TW Hya: an old protoplanetary disc revived by its planet https://arxiv.org/abs/2004.10094 - Quote :
- 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.
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| Subject: Re: Planet-forming disc around the nearby Sun-like star TW Hydrae | |
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