Two new ultracool benchmark systems from WISE+2MASS

J. I. Gomes; D.J. Pinfield; F. Marocco; A. C. Day-Jones; B. Burningham; Z. H. Zhang; H.R.A. Jones; L. van Spaandonk; D. Weights

doi:10.1093/mnras/stt371

Two new ultracool benchmark systems from WISE+2MASS

J. I. Gomes, D.J. Pinfield, F. Marocco, A. C. Day-Jones, B. Burningham, Z. H. Zhang, H.R.A. Jones, L. van Spaandonk, D. Weights

Centre for Astrophysics Research (CAR)

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Abstract

We have used the Two-Micron All-Sky Survey and the Wide-field Infrared Survey Explorer to look for ultracool dwarfs that are part of multiple systems containing main-sequence stars. We cross-matched L dwarf candidates from the surveys with Hipparcos and Gliese stars, finding two new systems. The first system, G255-34AB, is an L2 dwarf companion to a K8 star, at a distance of 36 pc. We estimate its bolometric luminosity as log L/L-circle dot = -3.78 +/- 0.045 and T-eff = 2080 +/- 260 K. The second system, GJ499ABC, is a triple, with an L5 dwarf as a companion to a binary with an M4 and K5 star. These two new systems bring the number of L dwarf plus main-sequence star multiple systems to 24, which we discuss. We consider the binary fraction for L dwarfs and main-sequence stars, and further assess possible unresolved multiplicity within the full companion sample. This analysis shows that some of the L dwarfs in this sample might actually be unresolved binaries themselves, since their M-J appears to be brighter than the expected for their spectral types.

Original language	English
Pages (from-to)	2745-2755
Number of pages	11
Journal	Monthly Notices of the Royal Astronomical Society
Volume	431
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stt371
Publication status	Published - May 2013

Keywords

surveys
brown dwarfs
stars: low-mass
ALL-SKY SURVEY
COMMON PROPER MOTION
LOW-MASS STARS
BROWN DWARF COMPANIONS
SPECTRAL TYPE-L
FIELD L-DWARFS
COOL NEIGHBORS
T-DWARFS
SOLAR NEIGHBORHOOD
ADAPTIVE OPTICS

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title = "Two new ultracool benchmark systems from WISE+2MASS",

abstract = "We have used the Two-Micron All-Sky Survey and the Wide-field Infrared Survey Explorer to look for ultracool dwarfs that are part of multiple systems containing main-sequence stars. We cross-matched L dwarf candidates from the surveys with Hipparcos and Gliese stars, finding two new systems. The first system, G255-34AB, is an L2 dwarf companion to a K8 star, at a distance of 36 pc. We estimate its bolometric luminosity as log L/L-circle dot = -3.78 +/- 0.045 and T-eff = 2080 +/- 260 K. The second system, GJ499ABC, is a triple, with an L5 dwarf as a companion to a binary with an M4 and K5 star. These two new systems bring the number of L dwarf plus main-sequence star multiple systems to 24, which we discuss. We consider the binary fraction for L dwarfs and main-sequence stars, and further assess possible unresolved multiplicity within the full companion sample. This analysis shows that some of the L dwarfs in this sample might actually be unresolved binaries themselves, since their M-J appears to be brighter than the expected for their spectral types.",

keywords = "surveys, brown dwarfs, stars: low-mass, ALL-SKY SURVEY, COMMON PROPER MOTION, LOW-MASS STARS, BROWN DWARF COMPANIONS, SPECTRAL TYPE-L, FIELD L-DWARFS, COOL NEIGHBORS, T-DWARFS, SOLAR NEIGHBORHOOD, ADAPTIVE OPTICS",

author = "Gomes, {J. I.} and D.J. Pinfield and F. Marocco and Day-Jones, {A. C.} and B. Burningham and Zhang, {Z. H.} and H.R.A. Jones and {van Spaandonk}, L. and D. Weights",

year = "2013",

month = may,

doi = "10.1093/mnras/stt371",

language = "English",

volume = "431",

pages = "2745--2755",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press (OUP)",

number = "3",

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TY - JOUR

T1 - Two new ultracool benchmark systems from WISE+2MASS

AU - Gomes, J. I.

AU - Pinfield, D.J.

AU - Marocco, F.

AU - Day-Jones, A. C.

AU - Burningham, B.

AU - Zhang, Z. H.

AU - Jones, H.R.A.

AU - van Spaandonk, L.

AU - Weights, D.

PY - 2013/5

Y1 - 2013/5

N2 - We have used the Two-Micron All-Sky Survey and the Wide-field Infrared Survey Explorer to look for ultracool dwarfs that are part of multiple systems containing main-sequence stars. We cross-matched L dwarf candidates from the surveys with Hipparcos and Gliese stars, finding two new systems. The first system, G255-34AB, is an L2 dwarf companion to a K8 star, at a distance of 36 pc. We estimate its bolometric luminosity as log L/L-circle dot = -3.78 +/- 0.045 and T-eff = 2080 +/- 260 K. The second system, GJ499ABC, is a triple, with an L5 dwarf as a companion to a binary with an M4 and K5 star. These two new systems bring the number of L dwarf plus main-sequence star multiple systems to 24, which we discuss. We consider the binary fraction for L dwarfs and main-sequence stars, and further assess possible unresolved multiplicity within the full companion sample. This analysis shows that some of the L dwarfs in this sample might actually be unresolved binaries themselves, since their M-J appears to be brighter than the expected for their spectral types.

AB - We have used the Two-Micron All-Sky Survey and the Wide-field Infrared Survey Explorer to look for ultracool dwarfs that are part of multiple systems containing main-sequence stars. We cross-matched L dwarf candidates from the surveys with Hipparcos and Gliese stars, finding two new systems. The first system, G255-34AB, is an L2 dwarf companion to a K8 star, at a distance of 36 pc. We estimate its bolometric luminosity as log L/L-circle dot = -3.78 +/- 0.045 and T-eff = 2080 +/- 260 K. The second system, GJ499ABC, is a triple, with an L5 dwarf as a companion to a binary with an M4 and K5 star. These two new systems bring the number of L dwarf plus main-sequence star multiple systems to 24, which we discuss. We consider the binary fraction for L dwarfs and main-sequence stars, and further assess possible unresolved multiplicity within the full companion sample. This analysis shows that some of the L dwarfs in this sample might actually be unresolved binaries themselves, since their M-J appears to be brighter than the expected for their spectral types.

KW - surveys

KW - brown dwarfs

KW - stars: low-mass

KW - ALL-SKY SURVEY

KW - COMMON PROPER MOTION

KW - LOW-MASS STARS

KW - BROWN DWARF COMPANIONS

KW - SPECTRAL TYPE-L

KW - FIELD L-DWARFS

KW - COOL NEIGHBORS

KW - T-DWARFS

KW - SOLAR NEIGHBORHOOD

KW - ADAPTIVE OPTICS

U2 - 10.1093/mnras/stt371

DO - 10.1093/mnras/stt371

M3 - Article

SN - 0035-8711

VL - 431

SP - 2745

EP - 2755

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

Two new ultracool benchmark systems from WISE+2MASS

Abstract

Keywords

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