New members of the Lupus I cloud based on Gaia astrometry. Physical and accretion properties from X-shooter spectra

Journal
Date Issued
2023
Author(s)
Majidi, F. Z.
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Manara, C. F.
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Beccari, G.
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Bayo, A.
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Mantovan, G.
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Montalto, M.
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Nardiello, D.
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Piotto, G.
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DOI
Abstract
We characterize twelve young stellar objects (YSOs) located in the Lupus I region, spatially overlapping with the Upper Centaurus Lupus (UCL) sub-stellar association. The aim of this study is to understand whether the Lupus I cloud has more members than what has been claimed so far in the literature and gain a deeper insight into the global properties of the region. We selected our targets using the Gaia DR2 catalog based on their consistent kinematic properties with the Lupus I bona fide members. In our sample of twelve YSOs observed by X-shooter, we identified ten Lupus I members. We could not determine the membership status of two of our targets, namely Gaia DR2 6014269268967059840 and 2MASS J15361110-3444473 due to technical issues. We found out that four of our targets are accretors, among them, 2MASS J15551027-3455045, with a mass of ∼0.03 M⊙, is one of the least massive accretors in the Lupus complex identified to date. Several of our targets (including accretors) are formed in situ and off-cloud with respect to the main filaments of Lupus I; hence, our study may hint that there are diffused populations of M dwarfs around Lupus I main filaments. In this context, we would like to emphasize that our kinematic analysis with Gaia catalogs played a key role in identifying the new members of the Lupus I cloud.

Based on observations collected at the European Southern Observatory at Paranal under program 105.20P9.001.

Volume
671
Start page
A46
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2023A&A...671A..46M
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open.access
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