J/A+A/640/A13 Par-Lup3-4 CO ALMA images (Santamaria-Miranda+, 2020)
Bipolar molecular outflow of the very low-mass star Par-Lup3-4.
Evidence for scaled-down low-mass star formation.
Santamaria-Miranda A., de Gregorio-Monsalvo I., Huelamo N., Plunkett A.L.,
Ribas A., Comeron F., Schreiber M.R., Lopez C., Muzic K., Testi L.
<Astron. Astrophys. 640, A13 (2020)>
=2020A&A...640A..13S 2020A&A...640A..13S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Carbon monoxide ; Millimetric/submm sources
Keywords: stars: formation - ISM: individual objects: Par-Lup3-4 -
ISM: jets and outflows - submillimeter: stars -
techniques: interferometric
Abstract:
Very low-mass stars are known to have jets and outflows, which is
indicative of a scaled-down version of low-mass star formation.
However, only very few outflows in very low-mass sources are well
characterized.
We characterize the bipolar molecular outflow of the very low-mass
star Par-Lup3-4, a 0.12M☉ object known to power an optical jet.
We observed Par-Lup3-4 with ALMA in Bands 6 and 7, detecting both the
continuum and CO molecular gas. In particular, we studied three main
emission lines: CO(2-1), CO(3-2), and 13CO(3-2).
Our observations reveal for the first time the base of a bipolar
molecular outflow in a very low-mass star, as well as a stream of
material moving perpendicular to the primary outflow of this source.
The primary outflow morphology is consistent with the previously
determined jet orientation and disk inclination. The outflow mass is
9.5x10-7M☉, with an outflow rate of 4.3x10-9M☉/yr. A
new fitting to the spectral energy distribution suggests that
Par-Lup3-4 may be a binary system.
We have characterized Par-Lup3-4 in detail, and its properties are
consistent with those reported in other very low-mass sources. This
source provides further evidence that very low-mass sources form as a
scaled-down version of low-mass stars.
Description:
ALMA Band 6 and 7. Continuum for each band, 12CO(3-2), 12CO(2-1),
13CO(3-2)
Objects:
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RA (2000) DE Designation(s)
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16 08 51.43 -39 05 30.5 Par-Lup3-4 = [CFB2003] Par-Lup3-4
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 184 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, fro the datacubes
35- 60 A26 "datime" Obs.date Observation date
62- 68 F7.3 GHz Freq ? Observed frequency or lower value of
frequency interval for the datacubes
70- 75 F6.2 GHz BFreq ? Upper value of frequency interval for the
datacubes
77- 82 I6 Hz dFreq ? Frequency resolution for the datacubes
83- 90 F8.2 m/s bVRAD ? Lower value of VRAD interval
92- 99 F8.2 m/s BVRAD ? Upper value of VRAD interval
101-103 I3 m/s dVRAD ? VRAD resolution
105-111 I7 Kibyte size Size of FITS file
113-140 A28 --- FileName Name of FITS file, in subdirectory fits
142-184 A43 --- Title Title of the FITS file
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Acknowledgements:
Alejandro Santamaria-Miranda, asantama(at)eso.org
(End) Patricia Vannier [CDS] 10-Jun-2020