J/ApJ/926/67 H-band polarization around YSOs & BDs (Clemens+, 2022)
Near-infrared polarization from unresolved disks around brown dwarfs and young
stellar objects.
Clemens D.P., Pillai T.G.S., Rilinger A.M., Espaillat C.C.
<Astrophys. J., 926, 67-67 (2022)>
=2022ApJ...926...67C 2022ApJ...926...67C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, brown dwarf; YSOs; Polarization; Infrared sources
Keywords: Star formation; Brown dwarfs; Protoplanetary disks; Polarimetry
Low mass stars; Interstellar magnetic fields; Molecular clouds
Abstract:
Wide-field near-infrared (NIR) polarimetry was used to examine disk
systems around two brown dwarfs (BDs) and two young stellar objects
(YSOs) embedded in the Heiles Cloud 2 (HCl2) dark molecular cloud in
Taurus as well as numerous stars located behind HCl2. Inclined disks
exhibit intrinsic NIR polarization due to scattering of photospheric
light, which is detectable even for unresolved systems. After removing
polarization contributions from magnetically aligned dust in HCl2
determined from the background star information, significant intrinsic
polarization was detected from the disk systems of one BD (ITG 17) and
both YSOs (ITG 15, ITG 25), but not from the other BD (2M0444). The
ITG 17 BD shows good agreement of the disk orientation inferred from
the NIR and from published Atacama Large Millimeter/submillimeter
Array (ALMA) dust continuum imaging. ITG 17 was also found to reside
in a 5200 au wide binary (or hierarchical quad star system) with the
ITG 15 YSO disk system. The inferred disk orientations from the NIR
for ITG 15 and ITG 17 are parallel to each other and perpendicular to
the local magnetic field direction. The multiplicity of the system and
the large BD disk nature could have resulted from formation in an
environment characterized by misalignment of the magnetic field and
the protostellar disks.
Description:
Observations of the CFHT Tau 4 and 2M0444 fields were obtained with
the Mimir instrument in its imaging polarimetry mode, which had a
pixel field of view of 0.6"x0.6" onto a 1024x1024 pixel ALADDIN III
InSb detector array, at the the 1.8m Perkins Telescope Observatory
(PTO), located on Anderson Mesa, outside Flagstaff, AZ on the UT
nights of 2019 December 13 and 21 as well as 2020 January 6, and
February 12 and 14. The total useful integration time for the
CFHT Tau 4 and 2M0444 fields was 55 minutes each.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 87 396 Observed near-infrared H-band polarization
properties of objects
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
VII/244 : Atlas and Catalog of Dark Clouds (Dobashi+, 2005)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/ApJS/186/111 : Spitzer observations of Taurus members (Luhman+, 2010)
J/ApJ/741/21 : Polarization of stars in Taurus (Chapman+, 2011)
J/ApJ/771/129 : Submillimetric Class II sources of Taurus (Andrews+, 2013)
J/A+A/570/A29 : TBOSS Survey I: Herschel/PACS (Bulger+, 2014)
J/A+A/578/L6 : Polarized images of MWC758 (Benisty+, 2015)
J/ApJ/833/176 : The magnetic field of L1544. I. NIR data (Clemens+, 2016)
J/A+A/599/A14 : Taurus ultra-wide pairs (Joncour+, 2017)
J/ApJ/858/41 : PS1 PM survey for brown dwarfs. I. Taurus (Zhang+, 2018)
J/A+A/620/A27 : Taurus ultra-wide pairs. II. (Joncour+, 2018)
J/ApJ/867/79 : NIR obs. of GF 9/LDN 1082C field stars (Clemens+, 2018)
J/AJ/156/271 : The stellar membership of the Taurus SFR (Luhman, 2018)
J/ApJ/872/158 : Survey of Class II sources in Taurus with ALMA (Akeson+, 2019)
J/AJ/157/144 : Protoplanetary disk masses in Taurus (Ballering+, 2019)
J/A+A/630/A137 : Structure and kinematics of the Taurus region (Galli+, 2019)
J/AJ/159/273 : Taurus members & nonmembers with K2 data (Rebull+, 2020)
J/AJ/160/24 : Circumstellar dust of 104 stars with GPIES (Esposito+, 2020)
J/ApJS/249/23 : Gal. Plane Infrared Polarization Survey, DR4 (Clemens+, 2020)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 I8 -- Seq [10001/20275] Field*10000+Object Number in
Field (1)
10- 17 F8.5 deg RAdeg [69.8/71.3] Gaia EDR3 Right Ascension
(ICRS) at Ep=2016.0
19- 26 F8.5 deg DEdeg [25/26.1] Gaia EDR3 Declination
(ICRS) at Ep=2016.0
28- 33 F6.3 mag Hmag [9.4/18] H-band magnitude (no color corrections)
35- 39 F5.2 % Pol [0/89] Debiased Linear Polarization Percentage
41- 45 F5.2 % e_Pol [0.08/64] Uncertainty in Pol
47- 51 F5.1 deg EPA [0/180] Equatorial Position Angle in deg E of N
53- 57 F5.1 deg e_EPA [0.7/180] Uncertainty in EPA
59- 65 F7.3 % Q [-60/59.6] Stokes Q as a percentage of Stokes I
67- 72 F6.3 % e_Q [0.08/65] Uncertainty in Stokes Q
74- 80 F7.3 % U [-64.6/99.9] Stokes U as a percentage of Stokes I
82- 87 F6.3 % e_U [0.08/62.6] Uncertainty in Stokes U
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Note (1): The initial digit identifies the R.A.-ordered field:
1 for the CFHT Tau 4 (2MASS J04394748+2601407) field;
2 for the 2M0444 (2MASS J04442713+2512164) field.
The remaining four digits encode an R.A.-ordered object serial number
for each field.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Sep-2023