J/MNRAS/468/3499 Partially resolved binaries in PS1 data (Deacon+, 2017)
Identification of partially resolved binaries in Pan-STARRS 1 data.
Deacon N.R., Magnier E.A., Best W.M.J., Liu M.C., Dupuy T.J.,
Chambers K.C., Draper P.W., Flewelling H., Metcalfe N., Tonry J.L.,
Wainscoat R.J., Waters C.
<Mon. Not. R. Astron. Soc., 468, 3499-3515 (2017)>
=2017MNRAS.468.3499D 2017MNRAS.468.3499D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple
Keywords: binaries: visual - brown dwarfs
Abstract:
Using shape measurement techniques developed for weak lensing surveys,
we have identified three new ultracool binaries in the Pan-STARRS 1
(Chambers et al., 2016, arXiv:1612.05560, Cat. II/349) survey. Binary
companions that are not completely resolved can still alter the shapes
of stellar images. These shape distortions can be measured if point
spread function anisotropy caused by the telescope is properly
accounted for. We show using both a sample of known binary stars and
simulated binaries that we can reliably recover binaries wider than
around 0.3-arcsec and with flux ratios greater than around 0.1. We
then applied our method to a sample of ultracool dwarfs within 30pc
with 293 objects having sufficient Pan-STARRS 1 data for our method.
In total, we recovered all but one of the 11 binaries wider than
0.3-arcsec in this sample. Our one failure was a true binary detected
with a significant but erroneously high ellipticity that led it to be
rejected in our analysis. We identify three new binaries, one a
simultaneous discovery, with primary spectral types M6.5, L1 and T0.5.
These latter two were confirmed with Keck/Near Infrared Camera 2
follow-up imaging. This technique will be useful for identifying large
numbers of stellar and substellar binaries in the upcoming Large
Synoptic Survey Telescope and Dark Energy Survey sky surveys.
Description:
We have applied shape measurement techniques to recover previously
known binaries and discover three new binaries. We applied this
technique to PS1 images.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 107 256 A list of objects that did not have ellipticity
at the reference seeing greater than 0.02 and
more significant than 4σ
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See also:
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers, 2016)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 43 A43 --- Name Name(s)
45- 46 I2 h RAh Right ascension (J2000)
48- 49 I2 min RAm Right ascension (J2000)
51- 55 F5.2 s RAs Right ascension (J2000)
57 A1 --- DE- Declination sign (J2000)
58- 59 I2 deg DEd Declination (J2000)
61- 62 I2 arcmin DEm Declination (J2000)
64- 67 F4.1 arcsec DEs Declination (J2000)
69- 73 F5.3 --- ePS1 PS1 ellipticity
75- 80 F6.3 --- e_ePS1 PS1 ellipticity error
82- 87 F6.3 --- e1 Ellipticity polarisation, elongation along
the right ascension axis
89- 93 F5.3 --- e_e1 Ellipticity polarisation, elongation along
the right ascension axis, error
95-100 F6.3 --- e2 Ellipticity polarisation, elongation along
the declination axis
102-107 F6.3 --- e_e2 Ellipticity polarisation, elongation along
the declination axis error
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Mar-2020