J/ApJ/784/62 Circumstellar disks around binary stars in Taurus (Akeson+, 2014)
Circumstellar disks around binary stars in Taurus.
Akeson R.L., Jensen E.L.N.
<Astrophys. J., 784, 62 (2014)>
=2014ApJ...784...62A 2014ApJ...784...62A (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Photometry, millimetric/submm
Keywords: binaries: general - protoplanetary disks - stars: formation
Abstract:
We have conducted a survey of 17 wide (>100 AU) young binary systems
in Taurus with the Atacama Large Millimeter Array (ALMA) at two
wavelengths. The observations were designed to measure the masses of
circumstellar disks in these systems as an aid to understanding the
role of multiplicity in star and planet formation. The ALMA
observations had sufficient resolution to localize emission within the
binary system. Disk emission was detected around all primaries and 10
secondaries, with disk masses as low as 10-4 M☉. We compare
the properties of our sample to the population of known disks in
Taurus and find that the disks from this binary sample match the
scaling between stellar mass and millimeter flux of
Fmm ∝M*1.5-2.0 to within the scatter found in previous
studies. We also compare the properties of the primaries to those of
the secondaries and find that the secondary/primary stellar and disk
mass ratios are not correlated; in three systems, the circumsecondary
disk is more massive than the circumprimary disk, counter to some
theoretical predictions.
Description:
The correlator was configured with each of the four basebands covering
a total bandwidth of 1.875 GHz with a channel spacing of 488 kHz. At
1.3 mm (Band 6), one of the correlator basebands was set to cover the
CO(2-1) transition at 230.5 GHz, while at 850 um (Band 7) one
baseband covered CO(3-2) at 345.8 GHz. Each target source was
observed only once per band and was bracketed by observations of the
gain calibrator, J051002+180041. Data for each band were calibrated
separately using the CASA package and scripts provided by the NRAO
ALMA center.
Objects:
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RA (ICRS) DE Designation(s)
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04 41.0 +25 52 Taurus = NAME Taurus Region
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 127 18 Positional Fitting Results
table3.dat 102 72 Gaussian Fitting Results
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See also:
J/ApJ/696/L84 : Primordial circumstellar disks in binary systems
(Cieza+, 2009)
J/ApJ/703/1511 : Wide binaries in Taurus and Upper Sco (Kraus+, 2009)
J/ApJ/751/115 : Millimeter emission from Taurus binary systems (Harris+, 2012)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Source Binary System identifier
17 A1 --- m_Source Multiplicity index on Source
19- 26 A8 --- Other [FV Tau/c ] Other Binary System identifier
28- 29 I2 h RAh Hour of Right Ascension (J2000)
31- 32 I2 min RAm Minute of Right Ascension (J2000)
34- 39 F6.3 s RAs Second of Right Ascension (J2000)
41- 45 F5.3 s e_RAs Error in RAs
48- 49 I2 deg DEd Degree of Declination (J2000)
51- 52 I2 arcmin DEm Arcminute of Declination (J2000)
54- 59 F6.3 arcsec DEs Arcsecond of Declination (J2000)
61- 65 F5.3 arcsec e_DEs Error in DEs
67- 68 I2 h RASh ? Secondary Hour of Right Ascension (J2000)
70- 71 I2 min RASm ? Secondary Minute of Right Ascension (J2000)
73- 78 F6.3 s RASs ? Secondary Second of Right Ascension (J2000)
80- 84 F5.3 s e_RASs ? Error in RASs
87- 88 I2 deg DESd ? Secondary Degree of Declination (J2000)
90- 91 I2 arcmin DESm ? Secondary Arcminute of Declination (J2000)
93- 98 F6.3 arcsec DESs ? Secondary Arcsecond of Declination (J2000)
100-104 F5.3 arcsec e_DESs ? Error in DESs
106-110 F5.3 arcsec Sep ? Separation
112-116 F5.3 arcsec e_Sep ? Error in Sep
118-122 F5.1 deg PA ? Position Angle
124-127 F4.1 deg e_PA ? Error in PA
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Band Observation ALMA band (1.3 mm, 850 mum)
9- 23 A15 --- Source Source identifier
25- 26 A2 --- m_Source Multiplicity index on Source
28 A1 --- l_PFlux [<] Limit flag on PFlux
29- 34 F6.2 mJy PFlux Peak flux
36- 39 F4.2 mJy e_PFlux Error in PFlux
41- 44 F4.2 arcsec Beam1 Beam size 1
46 A1 --- --- [x]
48- 51 F4.2 arcsec Beam2 Beam size 2
53- 58 F6.2 mJy TFlux ? Total flux in Band
60- 63 F4.2 mJy e_TFlux ? Error in TFlux
64 A1 --- n_TFlux [N] Note on TFlux (1)
66- 68 I3 mas Size1 ? Deconvolved Size 1
70- 72 I3 mas e_Size1 ? Error in Size1
74 A1 --- --- [x]
76- 78 I3 mas Size2 ? Deconvolved Size 2
80- 82 I3 mas e_Size2 ? Error in Size2
83 A1 --- n_Size2 [P] Note on Size2 (2)
85- 89 F5.1 deg PA ? Position Angle
91- 95 F5.1 deg e_PA ? Error in PA
97- 98 I2 deg Incl ? Inclination
100-102 I3 deg e_Incl ? Error in Incl
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Note (1): Note as follows:
N = Not detected.
Note (2): Note as follows:
P = Point source.
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History:
From electronic version of the journal
(End) Prepared by Tiphaine Pouvreau [CDS] 01-Jun-2017