Identifying Nearby, Young, Late-type Stars by Means of Their Circumstellar Disks

Abstract

It has recently been shown that a significant fraction of late-type members of nearby, very young associations (age <10 Myr) 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. Both new TWA members display mid-IR excess emission in the Wide-field Infrared Survey Explorer (WISE) catalog and they show proper motion and youthful spectroscopic characteristics -- namely Hαemission, 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.

ApJ, Accepted

References in corpus (5)

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• A New Method to Identify Nearby, Young, Low-mass Stars
• TW Hya Association Membership and New WISE-detected Circumstellar Disks
• A deep photometric survey of the eta Chamaeleontis cluster down to the brown dwarf - planet boundary
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