BROWN DWARF DISKS AT AGES OF 5-10 Myr

Basmah Riaz; Nicolas Lodieu; John E. Gizis

doi:10.1088/0004-637X/705/2/1173

BROWN DWARF DISKS AT AGES OF 5-10 Myr

Basmah Riaz, Nicolas Lodieu, John E. Gizis

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19 Citations (Scopus)

Abstract

We present Spitzer/IRAC and MIPS 24 mu m observations for 28 brown dwarfs in the Upper Scorpius (UppSco) region. We find a disk fraction of 10.7%-(+ 8.7%)(3.3%) . One object shows a small excess at 24 mu m but none at shorter wavelengths, and may be a candidate transition disk. Three objects show emission in the 10 mu m silicate feature and we present compositional fits for these sources. Flat structures are observed for all disk sources in UppSco. Also presented are the MIPS/70 mu m observations for the TW Hydrae Association brown dwarf 2MASS J1139511-315921. We discuss the structure and chemistry of brown dwarf disks at ages of similar to 5-10 Myr, and consider the possible effects of the brown dwarf densities in these clusters on the disk lifetimes.

Original language	English
Pages (from-to)	1173-1182
Number of pages	10
Journal	The Astrophysical Journal
Volume	705
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/705/2/1173
Publication status	Published - 10 Nov 2009

Keywords

circumstellar matter
open clusters and associations: individual (Taurus, Upper Scorpius)
stars: low-mass, brown dwarfs
SCORPIUS OB ASSOCIATION
TW-HYDRAE-ASSOCIATION
LOW-MASS STARS
MAIN-SEQUENCE STARS
LARGE-AREA SEARCH
TAURI STARS
FORMING REGION
GRAIN-GROWTH
PROTOPLANETARY DISKS
SPITZER OBSERVATIONS

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10.1088/0004-637X/705/2/1173

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@article{e31c50373d3143f8b0902219d921346e,

title = "BROWN DWARF DISKS AT AGES OF 5-10 Myr",

abstract = "We present Spitzer/IRAC and MIPS 24 mu m observations for 28 brown dwarfs in the Upper Scorpius (UppSco) region. We find a disk fraction of 10.7%-(+ 8.7%)(3.3%) . One object shows a small excess at 24 mu m but none at shorter wavelengths, and may be a candidate transition disk. Three objects show emission in the 10 mu m silicate feature and we present compositional fits for these sources. Flat structures are observed for all disk sources in UppSco. Also presented are the MIPS/70 mu m observations for the TW Hydrae Association brown dwarf 2MASS J1139511-315921. We discuss the structure and chemistry of brown dwarf disks at ages of similar to 5-10 Myr, and consider the possible effects of the brown dwarf densities in these clusters on the disk lifetimes.",

keywords = "circumstellar matter, open clusters and associations: individual (Taurus, Upper Scorpius), stars: low-mass, brown dwarfs, SCORPIUS OB ASSOCIATION, TW-HYDRAE-ASSOCIATION, LOW-MASS STARS, MAIN-SEQUENCE STARS, LARGE-AREA SEARCH, TAURI STARS, FORMING REGION, GRAIN-GROWTH, PROTOPLANETARY DISKS, SPITZER OBSERVATIONS",

author = "Basmah Riaz and Nicolas Lodieu and Gizis, {John E.}",

year = "2009",

month = nov,

day = "10",

doi = "10.1088/0004-637X/705/2/1173",

language = "English",

volume = "705",

pages = "1173--1182",

journal = "The Astrophysical Journal",

issn = "0004-637X",

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number = "2",

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TY - JOUR

T1 - BROWN DWARF DISKS AT AGES OF 5-10 Myr

AU - Riaz, Basmah

AU - Lodieu, Nicolas

AU - Gizis, John E.

PY - 2009/11/10

Y1 - 2009/11/10

N2 - We present Spitzer/IRAC and MIPS 24 mu m observations for 28 brown dwarfs in the Upper Scorpius (UppSco) region. We find a disk fraction of 10.7%-(+ 8.7%)(3.3%) . One object shows a small excess at 24 mu m but none at shorter wavelengths, and may be a candidate transition disk. Three objects show emission in the 10 mu m silicate feature and we present compositional fits for these sources. Flat structures are observed for all disk sources in UppSco. Also presented are the MIPS/70 mu m observations for the TW Hydrae Association brown dwarf 2MASS J1139511-315921. We discuss the structure and chemistry of brown dwarf disks at ages of similar to 5-10 Myr, and consider the possible effects of the brown dwarf densities in these clusters on the disk lifetimes.

AB - We present Spitzer/IRAC and MIPS 24 mu m observations for 28 brown dwarfs in the Upper Scorpius (UppSco) region. We find a disk fraction of 10.7%-(+ 8.7%)(3.3%) . One object shows a small excess at 24 mu m but none at shorter wavelengths, and may be a candidate transition disk. Three objects show emission in the 10 mu m silicate feature and we present compositional fits for these sources. Flat structures are observed for all disk sources in UppSco. Also presented are the MIPS/70 mu m observations for the TW Hydrae Association brown dwarf 2MASS J1139511-315921. We discuss the structure and chemistry of brown dwarf disks at ages of similar to 5-10 Myr, and consider the possible effects of the brown dwarf densities in these clusters on the disk lifetimes.

KW - circumstellar matter

KW - open clusters and associations: individual (Taurus, Upper Scorpius)

KW - stars: low-mass, brown dwarfs

KW - SCORPIUS OB ASSOCIATION

KW - TW-HYDRAE-ASSOCIATION

KW - LOW-MASS STARS

KW - MAIN-SEQUENCE STARS

KW - LARGE-AREA SEARCH

KW - TAURI STARS

KW - FORMING REGION

KW - GRAIN-GROWTH

KW - PROTOPLANETARY DISKS

KW - SPITZER OBSERVATIONS

U2 - 10.1088/0004-637X/705/2/1173

DO - 10.1088/0004-637X/705/2/1173

M3 - Article

SN - 0004-637X

VL - 705

SP - 1173

EP - 1182

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 2

ER -

BROWN DWARF DISKS AT AGES OF 5-10 Myr

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Keywords

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