Imperial College London
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DrJamesOwen

Faculty of Natural Sciences, Department of Physics

Senior Lecturer in Exoplanet Physics
 
 
 
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Contact

 

+44 (0)20 7594 5785james.owen CV

 
 
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Location

 

Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Hendler:2018:mnrasl/slx184,
author = {Hendler, NP and Pinilla, P and Pascucci, I and Pohl, A and Mulders, G and Henning, T and Dong, R and Clarke, C and Owen, J and Hollenbach, D},
doi = {mnrasl/slx184},
journal = {Monthly Notices of the Royal Astronomical Society: Letters},
pages = {L62--L66},
title = {A likely planet-induced gap in the disc around T Cha},
url = {http://dx.doi.org/10.1093/mnrasl/slx184},
volume = {475},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We present high-resolution (0.11 × 0.06 arcsec2) 3 mm ALMA observations of the highly inclined transition disc around the star T Cha. Our continuum image reveals multiple dust structures: an inner disc, a spatially resolved dust gap, and an outer ring. When fitting sky-brightness models to the real component of the 3 mm visibilities, we infer that the inner emission is compact (≤1 au in radius), the gap width is between 18 and 28 au, and the emission from the outer ring peaks at ∼36 au. We compare our ALMA image with previously published 1.6 μm VLT/SPHERE imagery. This comparison reveals that the location of the outer ring is wavelength dependent. More specifically, the peak emission of the 3 mm ring is at a larger radial distance than that of the 1.6 μm ring, suggesting that millimeter-sized grains in the outer disc are located farther away from the central star than micron-sized grains. We discuss different scenarios to explain our findings, including dead zones, star-driven photoevaporation, and planet-disc interactions. We find that the most likely origin of the dust gap is from an embedded planet, and estimate – for a single planet scenario – that T Cha's gap is carved by a 1.2MJup planet.
AU  - Hendler,NP
AU  - Pinilla,P
AU  - Pascucci,I
AU  - Pohl,A
AU  - Mulders,G
AU  - Henning,T
AU  - Dong,R
AU  - Clarke,C
AU  - Owen,J
AU  - Hollenbach,D
DO  - mnrasl/slx184
EP  - 66
PY  - 2018///
SN  - 1745-3925
SP  - 62
TI  - A likely planet-induced gap in the disc around T Cha
T2  - Monthly Notices of the Royal Astronomical Society: Letters
UR  - http://dx.doi.org/10.1093/mnrasl/slx184
UR  - http://hdl.handle.net/10044/1/58983
VL  - 475
ER  -
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