TY - JOUR
T1 - Identifying nearby, young, late-type stars by means of their circumstellar disks
AU - Schneider, Adam
AU - Song, Inseok
AU - Melis, Carl
AU - Zuckerman, B.
AU - Bessell, Mike
PY - 2012/10/1
Y1 - 2012/10/1
N2 - It has recently been shown that a significant fraction of late-type members of nearby, very young associations (age ≲10Myr) display excess emission at mid-IR wavelengths indicative of dusty circumstellar disks. We demonstrate that the detection of mid-IR excess emission can be utilized to identify new nearby, young, late-type stars including two definite new members ("TWA 33" and "TWA 34") of the TW Hydrae Association (TWA). Both new TWA members display mid-IR excess emission in the Wide-field Infrared Survey Explorer catalog and they show proper motion and youthful spectroscopic characteristics - namely, Hα emission, strong lithium absorption, and low surface gravity features consistent with known TWA members. We also detect mid-IR excess - the first unambiguous evidence of a dusty circumstellar disk - around a previously identified UV-bright, young, accreting star (2M1337) that is a likely member of the Lower-Centaurus Crux region of the Scorpius-Centaurus Complex.
AB - It has recently been shown that a significant fraction of late-type members of nearby, very young associations (age ≲10Myr) display excess emission at mid-IR wavelengths indicative of dusty circumstellar disks. We demonstrate that the detection of mid-IR excess emission can be utilized to identify new nearby, young, late-type stars including two definite new members ("TWA 33" and "TWA 34") of the TW Hydrae Association (TWA). Both new TWA members display mid-IR excess emission in the Wide-field Infrared Survey Explorer catalog and they show proper motion and youthful spectroscopic characteristics - namely, Hα emission, strong lithium absorption, and low surface gravity features consistent with known TWA members. We also detect mid-IR excess - the first unambiguous evidence of a dusty circumstellar disk - around a previously identified UV-bright, young, accreting star (2M1337) that is a likely member of the Lower-Centaurus Crux region of the Scorpius-Centaurus Complex.
KW - brown dwarfs
KW - circumstellar matter
KW - open clusters and associations: individual (TW Hydrae Association)
KW - stars: evolution
KW - stars: low-mass
KW - stars: pre-main sequence
UR - http://www.scopus.com/inward/record.url?scp=84866429359&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/757/2/163
DO - 10.1088/0004-637X/757/2/163
M3 - Article
SN - 0004-637X
VL - 757
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 163
ER -