J/ApJ/781/4 Photometry of high proper motion objects from WISE (Luhman, 2014)
A search for a distant companion to the Sun with the wide-field infrared survey
explorer.
Luhman K.L.
<Astrophys. J., 781, 4 (2014)>
=2014ApJ...781....4L 2014ApJ...781....4L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, late-type ; Stars, nearby ; Photometry, infrared ;
Proper motions
Keywords: brown dwarfs - infrared: planetary systems - solar neighborhood -
planets and satellites: detection - proper motions
Abstract:
I have used multi-epoch astrometry from the Wide-field Infrared Survey
Explorer to perform a search for a distant companion to the Sun via
its parallactic motion. I have not found an object of this kind down
to W2=14.5. This limit corresponds to analogs of Saturn and Jupiter at
28000 and 82000AU, respectively, according to models of the Jovian
planets by Fortney and coworkers. Models of brown dwarfs by Burrows
and coworkers predict fainter fluxes at a given mass for the age of
the solar system, producing a closer distance limit of 26000 AU for a
Jupiter-mass brown dwarf. These constraints exclude most combinations
of mass and separation at which a solar companion has been suggested
to exist by various studies over the years.
Description:
WISE collected images in four bands that were centered at 3.4, 4.6,
12, and 22µm, which are denoted as W1, W2, W3, and W4. The angular
resolution was ∼6'' in the first three bands and ∼12'' in W4. In areas
of sky that are unconfused and near the ecliptic plane, the images
from WISE typically achieved a signal-to-noise ratio (S/N) of 5 at
W1=16.8, W2=15.6, W3=11.3, and W4=8.0. The sensitivity was better at
higher ecliptic latitudes because of the larger number of exposures.
The typical astrometric precision was 0.4'' at S/N=20. WISE operated
from 2010 January 7 to 2011 February 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 150 762 New high proper motion objects
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See also:
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/ApJ/753/156 : T/Y brown dwarfs with WISE photometry (Kirkpatrick+, 2012)
J/ApJS/197/19 : First brown dwarfs discovered by WISE (Kirkpatrick+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [WISE ]
6- 24 A19 --- WISE Source name from WISE (cat. II/311)
(JHHMMSS.SS+DDMMSS.s)
26- 31 A6 --- --- [2MASS ]
32- 48 A17 --- 2MASS ? Source name from 2MASS (cat. II/246)
(JHHMMSSss+DDMMSSs)
50- 55 F6.3 arcsec/yr pmRA [-5/1.6] Proper motion in Right Ascension (1)
57- 61 F5.3 arcsec/yr e_pmRA [0.006/0.3] Error in pmRA
63- 68 F6.3 arcsec/yr pmDE [-1.4/1.7] Proper motion in Declination (1)
70- 74 F5.3 arcsec/yr e_pmDE [0.006/0.3] Error in pmDE
76- 80 F5.2 mag Jmag [9.5/17.2]? 2MASS J band magnitude (1)
82- 85 F4.2 mag e_Jmag [0.02/0.3]? Error in Jmag
87- 91 F5.2 mag Hmag [8.9/16.2]? 2MASS H band magnitude (1)
93- 96 F4.2 mag e_Hmag [0.01/0.2]? Error in Hmag
98-102 F5.2 mag Ksmag [8.7/15.5]? 2MASS Ks band magnitude (1)
104-107 F4.2 mag e_Ksmag [0.02/0.2]? Error in Ksmag
109-113 F5.2 mag W1mag [7.8/16.4] WISE W1 band (3.4µm)
magnitude (1)
115-118 F4.2 mag e_W1mag [0.02/0.09] Error in W1mag
120-124 F5.2 mag W2mag [7.3/14.5] WISE W2 band (4.6µm)
magnitude (1)
126-129 F4.2 mag e_W2mag [0.02/0.06] Error in W2mag
131-135 F5.2 mag W3mag [6.2/13.1]? WISE W3 band (12µm)
magnitude (1)
137-140 F4.2 mag e_W3mag [0.01/0.51]? Error in W3mag
142-145 F4.2 mag W4mag [5.9/9.2]? WISE W4 band (22µm) magnitude (1)
147-150 F4.2 mag e_W4mag [0.04/0.5]? Error in W4mag
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Note (1): Jmag, Hmag, and Ksmag are from the 2MASS Survey Point Source Reject
Table for WISE J051505.56-434333.9, WISE J175839.20-583931.6, and
WISE J191453.33-181044.4 and from the 2MASS Point Source Catalog
(cat. II/246) for all other 2MASS sources. W1-W4mag are from the WISE
All-Sky Source Catalog (Cutri et al. 2012, cat. II/311); detections that
appear false or unreliable based on visual inspection have been omitted.
Proper motions are based on astrometry from 2MASS (if available) and WISE.
For WISE 1049-5319, additional measurements of astrometry were included in
the proper motion measurement (Luhman, 2013ApJ...767L...1L 2013ApJ...767L...1L).
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History:
From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 09-Nov-2015