J/A+A/642/A86 Circumstellar disks in Lupus complex (Teixeira+, 2020)
A wide survey for circumstellar disks in the Lupus complex.
Teixeira P.S., Scholz A., Alves J.
<Astron. Astrophys., 642, A86 (2020)>
=2020A&A...642A..86T 2020A&A...642A..86T (SIMBAD/NED BibCode)
ADC_Keywords: Star Forming Region ; YSOs ; Infrared sources ; Optical
Keywords: proper motions - parallaxes - stars: formation -
circumstellar matter - ISM: clouds - ISM: structure
Abstract:
Previous star formation studies have, out of necessity, often defined
a population of young stars confined to the proximity of a molecular
cloud. Gaia allows us to examine a wider, three-dimensional structure
of nearby star forming regions, leading to a new understanding of
their history. We present a wide-area survey covering 494 deg2 of
the Lupus complex, a prototypical low-mass star forming region. Our
survey includes all known molecular clouds in this region as well as
parts of the Upper Scorpius and Upper Centaurus Lupus (UCL) groups of
the Sco-Cen complex. We combine Gaia DR2 proper motions and parallaxes
as well as ALLWISE mid-infrared photometry to select young stellar
objects (YSOs) with disks. The YSO ages are inferred from Gaia
color-magnitude diagrams, and their evolutionary stages from the slope
of the spectral energy distributions. We find 98 new disk-bearing
sources. Our new sample includes objects with ages ranging from 1 to
15Myr and masses ranging from 0.05 to 0.5M☉, and consists of 56
sources with thick disks and 42 sources with anemic disks. While the
youngest members are concentrated in the clouds and at distances of
160 pc, there is a distributed population of slightly older stars that
overlap in proper motion, spatial distribution, distance, and age with
the Lupus and UCL groups. The spatial and kinematic properties of the
new disk-bearing YSOs indicate that Lupus and UCL are not distinct
groups. Our new sample comprises some of the nearest disks to Earth at
these ages, and thus provides an important target for follow-up
studies of disks and accretion in very low mass stars, for example
with ALMA and ESO-VLT X-shooter.
Description:
Using Gaia DR2 and ALLWISE data, we identify 98 new low-mass YSOs
within the wider Lupus complex.
We use the Upper Scorpius (l,b) boundary to identify potential new US
members. The new disk-bearing YSOs are thus distributed: 19 new disks
in the Upper Scorpius region, 19 new disks in region of the V 1062
Scorpius sub-group, and 60 new disks in the region that is occupied by
both Lupus and UCL.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 78 80 New disk-bearing YSO candidate members of
Lupus and/or UCL
tabled1.dat 73 29 New disk-bearing YSO US candidate members
tablee1.dat 69 19 Candidate new V1062 Sco disk-bearing YSOs
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/328 : AllWISE Data Release (Cutri+ 2013)
Byte-by-byte Description of file: tablea1.dat tabled1.dat tablee1.dat
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Bytes Format Units Label Explanations
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1 A1 --- Group [AB] Group (1)
3- 10 A8 --- --- [Gaia DR2]
12- 30 I19 --- GaiaDR2 Gaia DR2 designation
31 A1 --- n_GaiaDR2 [d] Note on GaiaDR2 (2)
33- 37 A5 --- --- [WISEA]
39- 57 A19 --- WISEA ALLWISE designation
58 A1 --- n_WISEA [+] Note on WISEA (2)
60- 66 A7 --- Type Disk type
68- 78 A11 --- Notes Notes (3)
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Note (1): Groups as follows:
A = New candidate members with disks
B = Previously known members with disks
Note (2): Notes as follows:
d = confirming the previous identification by Kuruwita et al.
(2018MNRAS.480.5099K 2018MNRAS.480.5099K)
+ = Possible source confusion
Note (3): Notes as follows:
Ovar = flagged as variable by Gaia DR2
MIRvar = flagged as variable by ALLWISE
LR = Gaia DR 2 large RUWVE (defined as greater than 1.4)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Jan-2021