J/A+A/624/A33 HD 100453 AB system ALMA images (van der Plas+, 2019)
ALMA study of the HD 100453 AB system and the tidal interaction of the companion
with the disk.
van der Plas G., Menard F., Gonzalez J.F., Perez S., Rodet L., Pinte C.,
Cieza L., Casassus S., Benisty M.
<Astron. Astrophys. 624, A33 (2019)>
=2019A&A...624A..33V 2019A&A...624A..33V (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Stars, emission
Keywords: protoplanetary disks - planet-disk interactions -
stars: individual: HD 100453 -
stars: variables: T Tauri, Herbig Ae/Be - binaries: general
Abstract:
The complex system HD 100453 AB with a ring-like circumprimary disk
and two spiral arms, one of which is pointing to the secondary, is a
good laboratory in which to test spiral formation theories.
We aim to resolve the dust and gas distribution in the disk around
HD 100453 A and to quantify the interaction of HD 100453 B with the
circumprimary disk.
Using ALMA band 6 dust continuum and CO isotopologue observations we
have studied the HD 100453 AB system with a spatial resolution of
0.09"x0.17" at 234GHz. We used smoothed particle hydrodynamics (SPH)
simulations and orbital fitting to investigate the tidal influence of
the companion on the disk.
We resolve the continuum emission around HD 100453 A into a disk
between 0.22" and 0.40" with an inclination of 29.5° and a
position angle of 151.0°, an unresolved inner disk, and excess mm
emission cospatial with the northern spiral arm which was previously
detected using scattered light observations. We also detect CO
emission from 7au (well within the disk cavity) out to 1.10",
overlapping with HD 100453 B at least in projection. The outer CO disk
position angle (PA) and inclination dier by up to 10° from the
values found for the inner CO disk and the dust continuum emission,
which we interpret as due to gravitational interaction with
HD 100453 B. Both the spatial extent of the CO disk and the detection
of mm emission at the same location as the northern spiral arm are in
disagreement with the previously proposed near co-planar orbit of
HD 100453 B.
We conclude that HD 100453 B has an orbit that is significantly
misaligned with the circumprimary disk. Because it is unclear whether
such an orbit can explain the observed system geometry we highlight an
alternative scenario that explains all detected disk features where
another, (yet) undetected, low mass close companion within the disk
cavity, shepherds a misaligned inner disk whose slowly precessing
shadows excite the spiral arms.
Description:
ALMA early science cycle 3 observations were conducted in
a compact configuration on April 23rd 2016 with 13.1 minutes
of total time on-source and in an extended configuration on
September 8th 2016 with 26.2 minutes of total time on-source.
The array configuration provided baselines ranging between respectively
15 and 463 meters, and between 15 and 2483 meters.
During the observations the precipitable water vapor had a median
value at zenith of respectively 1.64 and 0.56mm.
Two of the four spectral windows of the ALMA correlator were
configured in time division mode (TDM) to maximize the sensitivity for
continuum observations (128 channels over 1.875GHz usable bandwidth).
These two TDM spectral windows were centered at 234.16GHz and
216.98GHz. The other two spectral windows were configured in frequency
division mode (FDM) to target the 12CO J=2-1, 13CO J=2-1 and C18O
J=2-1 lines with a spectral resolution of 61kHz, 122kHz, and 122kHz
respectively.
Objects:
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RA (2000) DE Designation(s)
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11 33 05.58 -54 19 28.5 HD 100453 = HIP 56354
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 229 5 List of fits images and datacubes
fits/* . 5 Individual fits images and datacubes
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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- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 32 I3 --- Nz ? Number of slices for the datacubes
34- 59 A26 "datime" Obs.date Observation date
61- 71 E11.6 Hz Freq Observed frequency or lower value of
frequency interval for the datacubes
73- 83 E11.6 Hz FreqU ? Upper value of frequency interval for the
datacubes
85- 90 I6 Hz dFreq ? Frequency resolution for the datacubes
92- 97 I6 Kibyte size Size of FITS file
99-171 A73 --- FileName Name of FITS file, in subdirectory fits
173-229 A57 --- Title Title of the FITS file
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Acknowledgements:
Gerrit van der Plas, info(at)gerritvanderplas.com
(End) Patricia Vannier [CDS] 26-Mar-2019