J/A+A/686/A120 HD 163296 CI datacube (Urbina+, 2024)
Vertical and radial distribution of atomic carbon in HD 163296.
Urbina F., Miley J., Kama M., Keyte L.
<Astron. Astrophys. 686, A120 (2024)>
=2024A&A...686A.120U 2024A&A...686A.120U (SIMBAD/NED BibCode)
ADC_Keywords: YSOs ; Protostars
Keywords: astrochemistry - protoplanetary disks - circumstellar matter
Abstract:
In protoplanetary disks, atomic carbon is expected to originate from
the PDR at the disk surface where CO is dissociated by
UV photons coming from the stellar, or external interstellar,
radiation field. Even though atomic carbon has been detected in
several protoplanetary disks, there is a lack of spatially resolved
observations of it.
For HD 163296 protoplanetary disk, we aim to obtain both radial and
vertical structure of [CI]=3P1-3P0 line emission and perform
the first direct comparison of this tracer with optically thick line
emission 12CO J=2-1.
We used archival ALMA data for [CI]=3P1-3P0 and previously
published 12CO J=2-1 data in HD 163296. Through the software of
disksurf we extracted the vertical structure, meanwhile radial
profiles were obtained directly from imaging. Brand new DALI modelling
was employed to perform direct comparison to the data.
We found that these tracers are collocated radially but not
vertically, where 12CO J=2-1 emission is, on average, located at
higher altitudes, as it is also the case for other tracers in the same
disk.
Due to this difference in vertical height of the emission, the
optically thick 12CO J=2-1 emission line appears to trace the
highest altitudes, despite the expected formation mechanism of [CI] in
the disk. The latter phenomena may be due to efficient mixing of the
upper layers of the disk, or UV photons penetrating deeper than we
expected.
Description:
Reduced ALMA band 8 datacube of CI 3P1 - 3P0 for HD 163296.
Objects:
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RA (2000) DE Designation(s)
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17 56 21.28 -21 57 21.8 HD 163296 = BD-21 4779
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 189 1 Information of fits datacube
fits/* . 1 fits datacube
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See also:
J/A+A/605/A21 : H2CO production in HD 163296 (Carney+, 2017)
J/A+A/664/A137 : HD 163296 disk rings distribution of solids (Guidi+, 2022)
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- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 29 I2 --- Nz Number of slices
31- 56 A26 "datime" Obs.date Observation date
58- 68 E11.6 Hz bFREQ Lower value of frequency interval
70- 80 E11.6 Hz BFREQ Upper value of frequency interval
82- 87 I6 Hz dFREQ Frequency resolution
89- 93 I5 Kibyte size Size of FITS file
95-121 A27 --- FileName Name of FITS file, in subdirectory fits
123-189 A67 --- Title Title of the FITS file
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Acknowledgements:
Francisco Urbina, urbinajimenezfrancisco(at)gmail.com
(End) Patricia Vannier [CDS] 27-Mar-2024