J/ApJ/743/141 T dwarf companions around M, L, T dwarfs in IR (Carson+, 2011)
A Spitzer IRAC imaging survey for T dwarf companions around M, L, and T dwarfs:
observations, results, and Monte Carlo population analyses.
Carson J.C., Marengo M., Patten B.M., Luhman K.L., Sonnett S.M., Hora J.L.,
Schuster M.T., Allen P.R., Fazio G.G., Stauffer J.R., Schnupp C.
<Astrophys. J., 743, 141 (2011)>
=2011ApJ...743..141C 2011ApJ...743..141C
ADC_Keywords: Stars, distances ; Stars, late-type ; Stars, double and multiple ;
Spectral types ; Infrared sources
Keywords: binaries: general - brown dwarfs - infrared: stars -
methods: numerical - methods: statistical - stars: late-type -
stars: low-mass
Abstract:
We report observational techniques, results, and Monte Carlo
population analyses from a Spitzer Infrared Array Camera imaging
survey for substellar companions to 117 nearby M, L, and T dwarf
systems (median distance of 10pc, mass range of 0.6 to ∼0.05M☉).
The two-epoch survey achieves typical detection sensitivities to
substellar companions of [4.5um]≤17.2mag for angular separations
between about 7" and 165". Based on common proper motion analysis, we
find no evidence for new substellar companions. Using Monte Carlo
orbital simulations (assuming random inclination, random eccentricity,
and random longitude of pericenter), we conclude that the
observational sensitivities translate to an ability to detect
600-1100K brown dwarf companions at semimajor axes ≳35AU and to
detect 500-600 K companions at semimajor axes ≳60AU. The simulations
also estimate a 600-1100K T dwarf companion fraction of <3.4% for
35-1200AU separations and <12.4% for the 500-600K companions for
60-1000AU separations.
Description:
The 117 targets were observed between 2003 and 2009 with the IRAC
camera on the Spitzer Space Telescope. The IRAC full width at
half-maximum (FWHM) at 4.5um is 1.6". With the exception of
2MASS J17281150+3948593, all targets were observed in at least two
epochs. The first-epoch observations of the 117 targets were performed
in Spitzer programs 33 and 35. Second-epoch follow-up observations
were carried out in PID 50013, 30298, 60046, 3736, 70021, and 30179
programs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 174 117 Sample of late M, L, and T dwarf systems
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2013)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
J/ApJS/197/19 : First brown dwarfs discovered by WISE (Kirkpatrick+, 2011)
J/ApJ/710/1627 : Mid-IR photometry of cold brown dwarfs (Leggett+, 2010)
J/AJ/137/1 : Proper motions of late-type dwarfs (Faherty+, 2009)
J/ApJ/651/502 : Spitzer IRAC photometry of M, L, and T dwarfs (Patten+, 2006)
J/AJ/125/3302 : HST binary very low mass stars and brown dwarfs (Gizis+, 2003)
J/AJ/126/1526 : IR photometry of ultracool dwarfs (Bouy+, 2003)
J/MNRAS/328/45 : Late-type stars members of young groups (Montes+, 2001)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 26 A26 --- Name Star name
28- 29 I2 --- PID1 Spitzer first-epoch observing program (33 or 35)
31- 35 I5 --- PID2 ? Spitzer second-epoch follow-up observing
program ID
37- 38 A2 --- l_SpT [≲] Limit flag on SpT
39- 51 A13 --- SpT MK spectral type
52 A1 --- n_SpT [df] Origin of SpT (1)
54- 56 A3 --- r_SpT Spectral type reference(s) (2)
58- 61 F4.1 pc Dist [1.3/43.8] Distance (3)
62 A1 --- f_Dist [ce] Flag on Dist (1)
64-168 A105 --- Notes Multiplicity notes (all multiple systems are
unresolved unless otherwise noted)
170-174 A5 --- r_Notes Multiplicity reference(s) (2)
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Note (1): Flag as follows:
c = Distance approximated from 3.6um magnitude, spectral type, and
magnitude-spectral-type relations from Patten et al. (2006,
Cat. J/ApJ/651/502).
d = Spectral types derived by authors using Delfosse et al.
(1999A&A...350L..39D 1999A&A...350L..39D) mass estimates and Baraffe & Chabrier
(1996ApJ...461L..51B 1996ApJ...461L..51B) mass/spectral-type relations.
e = From Neuhauser et al. (2002AN....323..447N 2002AN....323..447N).
f = Composite identification.
Note (2): Reference as follows:
1 = NASA/IPAC/NExScI Star and Exoplanet Database,
http://nsted.ipac.caltech.edu/
2 = Patten et al. 2006, Cat. J/ApJ/651/502
3 = Montes et al. 2001, Cat. J/MNRAS/328/45
4 = Washington Double Star Catalog; Mason et al. 2001, Cat. B/wds
5 = Nakajima et al. 1995Natur.378..463N 1995Natur.378..463N
6 = Hipparcos; Perryman et al. 1997, Cat. I/239
7 = Golimowski et al. 2004AJ....127.3516G 2004AJ....127.3516G
8 = Delfosse et al. 1999A&A...350L..39D 1999A&A...350L..39D
9 = Baraffe & Chabrier 1996ApJ...461L..51B 1996ApJ...461L..51B
10 = Wertheimer & Laughlin 2006AJ....132.1995W 2006AJ....132.1995W
11 = Schroeder et al. 2000AJ....119..906S 2000AJ....119..906S
12 = Burgasser et al. 2008ApJ...681..579B 2008ApJ...681..579B
13 = Reid et al. 2001AJ....121..489R 2001AJ....121..489R
14 = Liu & Leggett 2005ApJ...634..616L 2005ApJ...634..616L; Gelino et al. 2006PASP..118..611G 2006PASP..118..611G
15 = Bouy et al. 2003, Cat. J/AJ/126/1526
16 = Burgasser et al. 2006ApJS..166..585B 2006ApJS..166..585B
17 = Gizis et al. 2003, Cat. J/AJ/125/3302
18 = Burgasser et al. 2005AJ....129.2849B 2005AJ....129.2849B
19 = McCaughrean et al. 2004A&A...413.1029M 2004A&A...413.1029M
20 = Scholz et al. 2003A&A...398L..29S 2003A&A...398L..29S
21 = Burgasser et al. 2003ApJ...586..512B 2003ApJ...586..512B
Note (3): Values from Patten et al. (2006, Cat. J/ApJ/651/502), when available,
or NASA/IPAC/NExScI Star and Exoplanet Database (NStED
http://nsted.ipac.caltech.edu/), unless otherwise noted.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 14-May-2013