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Dusty disk winds at the sublimation rim of the highly inclined, low mass young stellar object SU Aurigae

Labdon, Aaron and Kraus, Stefan and Davies, Claire L. and Kreplin, Alexander and Kluska, Jacques and Harries, Tim J. and Monnier, John D. and ten Brummelaar, Theo and Baron, Fabien and Millan-Gabet, Rafael and Kloppenborg, Brian and Eisner, Joshua and Sturmann, Judit and Sturmann, Laszlo (2019) Dusty disk winds at the sublimation rim of the highly inclined, low mass young stellar object SU Aurigae. Astronomy and Astrophysics, 627 . Art. No. A36. ISSN 0004-6361. https://resolver.caltech.edu/CaltechAUTHORS:20190718-134208256

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Abstract

Context. T Tauri stars are low-mass young stars whose disks provide the setting for planet formation. Despite this, their structure is poorly understood. We present new infrared interferometric observations of the SU Aurigae circumstellar environment that offer resolution that is three times higher and a better baseline position angle coverage than previous observations. Aims. We aim to investigate the characteristics of the circumstellar material around SU Aur, constrain the disk geometry, composition and inner dust rim structure. Methods. The CHARA array offers unique opportunities for long baseline observations, with baselines up to 331 m. Using the CLIMB three-telescope combiner in the K-band allows us to measure visibilities as well as closure phase. We undertook image reconstruction for model-independent analysis, and fitted geometric models such as Gaussian and ring distributions. Additionally, the fitting of radiative transfer models constrain the physical parameters of the disk. For the first time, a dusty disk wind is introduced to the radiative transfer code TORUS to model protoplanetary disks. Our implementation is motivated by theoretical models of dusty disk winds, where magnetic field lines drive dust above the disk plane close to the sublimation zone. Results. Image reconstruction reveals an inclined disk with slight asymmetry along its minor-axis, likely due to inclination effects obscuring the inner disk rim through absorption of incident star light on the near-side and thermal re-emission and scattering of the far-side. Geometric modelling of a skewed ring finds the inner rim at 0.17 ± 0.02 au with an inclination of 50.9 ± 1.0° and minor axis position angle 60.8 ± 1.2°. Radiative transfer modelling shows a flared disk with an inner radius at 0.18 au which implies a grain size of 0.4 μm assuming astronomical silicates and a scale height of 15.0 at 100 au. Among the tested radiative transfer models, only the dusty disk wind successfully accounts for the K-band excess by introducing dust above the mid-plane.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1051/0004-6361/201935331DOIArticle
https://arxiv.org/abs/1905.11907arXivDiscussion Paper
ORCID:
AuthorORCID
Labdon, Aaron0000-0001-8837-7045
Kraus, Stefan0000-0001-6017-8773
Davies, Claire L.0000-0001-9764-2357
Kreplin, Alexander0000-0002-0911-9505
Kluska, Jacques0000-0002-9491-393X
Harries, Tim J.0000-0001-8228-9503
Monnier, John D.0000-0002-3380-3307
ten Brummelaar, Theo0000-0002-0114-7915
Baron, Fabien0000-0002-8376-8941
Millan-Gabet, Rafael0000-0003-0447-5866
Kloppenborg, Brian0000-0003-0350-5453
Alternate Title:Dusty disk winds at the sublimation rim of the highly inclined, low mass YSO SU Aurigae
Additional Information:© 2019 ESO. Article published by EDP Sciences. Received 21 February 2019; Accepted 28 May 2019; Published online 27 June 2019. We acknowledge support from an STFC studentship (No. 630008203) and an European Research Council Starting Grant (Grant Agreement No. 639889). This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. The original description of the VizieR service was published in Ochsenbein et al. (2000).
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)630008203
European Research Council (ERC)639889
Subject Keywords:protoplanetary disks – stars: variables: T Tauri, Herbig Ae/Be – techniques: interferometric – radiative transfer
Record Number:CaltechAUTHORS:20190718-134208256
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190718-134208256
Official Citation:Dusty disk winds at the sublimation rim of the highly inclined, low mass young stellar object SU Aurigae. Aaron Labdon, Stefan Kraus, Claire L. Davies, Alexander Kreplin, Jacques Kluska, Tim J. Harries, John D. Monnier, Theo ten Brummelaar, Fabien Baron, Rafael Millan-Gabet, Brian Kloppenborg, Joshua Eisner, Judit Sturmann and Laszlo Sturmann. A&A, 627 (2019) A36. DOI: https://doi.org/10.1051/0004-6361/201935331
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97238
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Jul 2019 20:49
Last Modified:03 Oct 2019 21:29

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