A likely planet-induced gap in the disc around T Cha

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Title: A likely planet-induced gap in the disc around T Cha
Author(s): Hendler, NP
Pinilla, P
Pascucci, I
Pohl, A
Mulders, G
Henning, T
Dong, R
Clarke, C
Owen, J
Hollenbach, D
Item Type: Journal Article
Abstract: 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.
Publication Date: 21-Mar-2018
Date of Acceptance: 17-Nov-2017
URI: http://hdl.handle.net/10044/1/58983
DOI: https://doi.org/10.1093/mnrasl/slx184
ISSN: 1745-3925
Publisher: Oxford University Press
Start Page: L62
End Page: L66
Journal / Book Title: Monthly Notices of the Royal Astronomical Society: Letters
Volume: 475
Issue: 1
Copyright Statement: © 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This is a pre-copy-editing, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters, following peer review. The definitive publisher-authenticated version Nathanial P Hendler, Paola Pinilla, Ilaria Pascucci, Adriana Pohl, Gijs Mulders, Thomas Henning, Ruobing Dong, Cathie Clarke, James Owen, David Hollenbach; A likely planet-induced gap in the disc around T Cha, Monthly Notices of the Royal Astronomical Society: Letters, Volume 475, Issue 1, 21 March 2018, Pages L62–L66, is available online at: https://doi.org/10.1093/mnrasl/slx184
Sponsor/Funder: The Royal Society
Funder's Grant Number: UF150412
Keywords: 0201 Astronomical And Space Sciences
Publication Status: Published
Online Publication Date: 2017-12-06
Appears in Collections:Physics
Astrophysics
Faculty of Natural Sciences



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