J/A+A/670/L1 12CO cube of RX J1604.3-2130 A (Stadler+, 2023)
A kinematically detected planet candidate in a transition disk.
Stadler J., Benisty M., Izquierdo A., Facchini S., Teague R., Kurtovic N.,
Pinilla P., Bae J., Ansdell M., Loomis R., Mayama S., Perez L.M., Testi L.
<Astron. Astrophys. 670, L1 (2023)>
=2023A&A...670L...1S 2023A&A...670L...1S (SIMBAD/NED BibCode)
ADC_Keywords: YSOs ; Morphology ; Millimetric/submm sources
Keywords: planets and satellites: formation - protoplanetary disks -
planet-disk interactions
Abstract:
Transition disks are protoplanetary disks with inner cavities possibly
cleared by massive companions. Observing them at high resolution is
ideal for mapping their velocity structure and probing companion-disk
interactions.
We present Atacama Large Millimeter/submillimeter Array (ALMA) Band 6
dust and gas observations of the transition disk around
RXJ1604.3-2130 A, known to feature nearly symmetric shadows in
scattered light, and aim to search for non-Keplerian features. We
studied the 12CO line channel maps and moment maps of the
line-of-sight velocity and peak intensity. We fitted a Keplerian model
of the channel-by-channel emission to study line profile differences
and produced deprojected radial profiles for all velocity components.
The 12CO emission is detected out to R∼1.8" (265au). It shows a
cavity inward of 0.39" (∼56au) and within the dust continuum ring (at
∼0.56", i.e., 81au). Azimuthal brightness variations in the 12CO
line and dust continuum are broadly aligned with the shadows detected
in scattered-light observations. We find a strong localized
non-Keplerian feature toward the west within the continuum ring at
R=41±10au and PA=280±2deg. It accounts Dvphi/vkep∼0.4 or
Dvz/vkep∼0.04, depending on if the perturbation is in the
rotational or vertical direction. A tightly wound spiral is also
detected and extends over 300deg in azimuth, possibly connected to the
localized non-Keplerian feature. Finally, a bending of the
iso-velocity contours within the gas cavity indicates a highly
perturbed inner region, possibly related to the presence of a
misaligned inner disk.
While broadly aligned with the scattered-light shadows, the localized
non-Keplerian feature cannot be solely due to changes in temperature.
Instead, we interpret the kinematical feature as tracing a massive
companion located at the edge of the dust continuum ring. We speculate
that the spiral is caused by buoyancy resonances driven by planet-disk
interactions. However, this potential planet at ∼41au cannot explain
the gas-depleted cavity, the low accretion rate, and the misaligned
inner disk, which suggests the presence of another companion closer
in.
Description:
ALMA Band 6 observations of RXJ1604.3-2130 A 12CO J=2-1 molecular
line in units Jy/beam and a channel spacing of 100m/s.
Objects:
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RA (2000) DE Designation(s)
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16 04 21.65 -21 30 28.5 RXJ1604.3-2130 A = 2MASS J16042165-2130284
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 247 1 *Information of fits datacube
fits/* . 1 fits datacube
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Note on list.dat: The cube has been imaged with a robust parameter of 1.0,
a 4 sigma threshold clipping and a tappering parameter of 0.1-arcsec.
The JvM correction was used.
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See also:
J/A+A/598/A43 : 2MASS J16042165-2130284 high-contrast images (Canovas+, 2017)
J/A+A/633/A37 : RXJ1604.3-2130A griz and JHK light curves
(Sicilia-Aguilar+, 2020)
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 pixels along Z-axis
34- 55 A22 "datime" Obs.date Observation date
57- 67 E11.6 Hz bFREQ Lower value of frequency interval
69- 79 E11.6 Hz BFREQ Upper value of frequency interval
81- 87 F7.1 Hz dFREQ Frequency resolution
89- 94 I6 Kibyte size Size of FITS file
96-125 A30 --- FileName Name of FITS file, in subdirectory fits
127-247 A121 --- Title Title of the FITS file
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Acknowledgements:
Jochen Stadler, jochen.stadler(at)oca.eu
(End) Patricia Vannier [CDS] 09-Jan-2023