J/A+A/678/A6 SU-Aur MIRCX interferometric observations (Labdon+, 2023)
Imaging the warped dusty disk wind environment of SU Aurigae with MIRC-X.
Labdon A., Kraus S., Davies C.L., Kreplin A., Zarrilli S., Monnier J.D.,
Le Bouquin J.-B., Anugu N., Setterholm B., Gardner T., Ennis J.,
Lanthermann C., ten Brummelaar T., Schaefer G., Harries T.J.
<Astron. Astrophys. 678, A6 (2023)>
=2023A&A...678A...6L 2023A&A...678A...6L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; YSOs ; Interferometry ; Infrared
Keywords: accretion, accretion disks - techniques: interferometric -
protoplanetary disks - stars: variables: T Tauri, Herbig Ae/Be
Abstract:
T Tauri stars are low-mass young stars whose disks provide the setting
for planet formation, which is one of the most fundamental processes in
astronomy. Yet the mechanisms of this are still poorly understood. SU
Aurigae is a widely studied T Tauri star and here we present original
state-of-the-art interferometric observations with better uv and
baseline coverage than previous studies. We aim to investigate the
characteristics of the circumstellar material around SU Aur, and
constrain the disk geometry, composition and inner dust rim structure.
The MIRC-X instrument at CHARA is a six-telescope optical beam
combiner offering baselines up to 331m. 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 constrained the physical
parameters of the disk.
Image reconstruction reveals a highly inclined disk with a slight
asymmetry consistent with inclination effects obscuring the inner disk
rim through absorption of incident star light on the near side and
thermal re-emission/scattering of the far side. Geometric models find
that the underlying brightness distribution is best modelled as a
Gaussian with a Full-Width Half-Maximum (FWHM) of 1.53±0.01mas at an
inclination of 56.9±0.4° and a minor axis position angle of
55.9±0.5°. Radiative transfer modelling shows a flared disk with
an inner radius at 0.16au which implies a grain size of 0.14um
assuming astronomical silicates and a scale height of 9.0au at 100au.
In agreement with the literature, only the dusty disk wind
successfully accounts for the near infrared (NIR) excess by
introducing dust above the mid-plane.
Our results confirm and provide better constraints than previous inner
disk studies of SU Aurigae. We confirm the presence of a dusty disk
wind in the circumstellar environment, the strength of which is
enhanced by a late infall event which also causes very strong
misalignments between the inner and outer disks.
Description:
The CHARA array is a Y-shaped interferometric facility that
comprises six 1m telescopes. It is located at the Mount Wilson
Observatory, California, and offers operational baselines between 34
and 331m (ten Brummelaar et al., 2005ApJ...628..453T 2005ApJ...628..453T). The MIRC-X
instrument (Anugu et al., arXiv:2007.12320; Kraus et al.,
arXiv:2004.01204), a six-telescope beam combiner, was used to obtain
observations in the near-infrared H-band (λ=1.63um,
{DELTA}λ=0.35um) between September and October 2018. We
obtained 11 independent pointings of SU Aur, using a mixture of 5 and
6-telescope configurations, due to the short delay line limitations of
CHARA. We obtained a maximum physical baseline of 331m corresponding
to a resolution of λ/(2B)=0.70mas [milliarcseconds], where
λ is the observing wavelength and B is the projected baseline.
MIRCX data of SU Aura as OI-fits files.
Objects:
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RA (2000) DE Designation(s)
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04 55 59.38 +30 34 01.4 SU Aur = HD 282624
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 96 29 List of OI-FITS files
fits/* . 29 Individual OI-FITS files
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Simbad right ascension (J2000)
4- 5 I2 min RAm Simbad right ascension (J2000)
7- 11 F5.2 s RAs Simbad right ascension (J2000)
12 A1 --- DE- Simbad declination sign (J2000)
13- 14 I2 deg DEd Simbad declination (J2000)
16- 17 I2 arcmin DEm Simbad declination (J2000)
19- 23 F5.2 arcsec DEs Simbad declination (J2000)
25- 34 A10 "date" Obs.date Observation date
36- 38 I3 Kibyte size Size of OI-FITS file
40- 57 A18 --- FileName Name of OI-FITS file, in subdirectory fits
59- 96 A38 --- Title Title of the OI-FITS file
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Acknowledgements:
Aaron Labdon, alabdon(at)eso.org
(End) Aaron Labdon [ESO, Chile], Patricia Vannier [CDS] 30-Aug-2023