J/A+A/636/A26 4 young protostars ALMA and NOEMA spectral cubes (Harsono+, 2020)
Missing water in Class I protostellar disks.
Harsono D., Persson M.V., Ramos A., Murillo N.M., Maud L.T.,
Hogerheijde M.R., Bosman A.D., Kristensen L.E., Jorgensen J.K.,
Bergin E.A., Visser R., Mottram J.C., van Dishoeck E.F.
<Astron. Astrophys. 636, A26 (2020)>
=2020A&A...636A..26H 2020A&A...636A..26H (SIMBAD/NED BibCode)
ADC_Keywords: YSOs ; Spectra, millimetric/submm
Keywords: stars: protostars - stars: formation - ISM: abundances -
astrochemistry - porotoplanetary disks -
Abstract:
Water is a key volatile that provides insights into the initial stages
of planet formation. However, little is known about the water vapor
abundance in newly formed planet-forming disks. We present H218O
line observations with ALMA and NOEMA millimeter interferometers
toward five young stellar objects. NOEMA observed the 203GHz line
while ALMA targeted the 390GHz line.
No emission is detected toward any of our five Class I disks. We
report upper limits to the integrated line intensities. The inferred
water column densities in Class I disks are <1015cm-2 on 100au
scales which include both disk and envelope. Water vapor is not
abundant in warm protostellar envelopes around Class I protostars.
Upper limits to the water vapor column densities in Class I disks are
at least two orders magnitude lower than values found in Class 0
disk-like structures.
Description:
Spectral cube of ALMA and NOEMA observations including the continuum
images that were used in the publication. The targets are young
protostars TMC1A, L1527, Elias 29, GSS30 IRS1, and GSS 30 IRS3.
Objects:
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RA (2000) DE Designation(s)
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04 39 35.19 +25 41 44.7 TMC1A = TMC-1A
04 39 53 +25 45.0 L1527 = LDN 1527 = LDN 1527
16 27 09.43 -24 37 18.8 Elias 29 = Elia 2-29
16 26 21.38 -24 23 04.1 GSS 30 IRS1 = [CHG85] GSS 30 IRS 1
16 26 21.77 -24 22 51.4 GSS 30 IRS3 = [CHG85] GSS 30 IRS 3
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 191 24 List of fits images and spectral cubes
fits/* . 24 Individual images and spectral cubes
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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 datcubes
34- 56 A23 "datime" Obs.date Observation date
58- 64 F7.3 GHz bFreq ? Observed frequency or lower value of
frequency interval for the datacubes
66- 72 F7.3 GHz BFreq ? Upper value of frequency interval for the
datacubes
74- 84 E11.6 Hz dFreq ? Frequency resolution
86- 93 F8.2 m/s bVRAD ? Radial velocity or lower value of radial
velocity interval for the datacubes
95-101 F7.1 m/s BVRAD ? Upper value of radial velocity interval
for the datacubes
103-110 F8.3 m/s dVRAD ? Radial velocity resolution for the datacubes
112-117 I6 Kibyte size Size of FITS file
119-147 A29 --- FileName Name of FITS file, in subdirectory fits
149-191 A43 --- Title Title of the FITS file
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Acknowledgements:
Daniel Harsono, dsharsono(at)asiaa.sinica.edu.tw
(End) Patricia Vannier [CDS] 26-Feb-2020