J/ApJ/939/94 New associations in Gaia DR3 solar neighborhood (Moranta+, 2022)
New coronae and stellar associations revealed by a clustering analysis of the
solar neighborhood.
Moranta L., Gagne J., Couture D., Faherty J.K.
<Astrophys. J., 939, 94 (2022)>
=2022ApJ...939...94M 2022ApJ...939...94M
ADC_Keywords: Associations, stellar; Clusters, open; Proper motions;
Radial velocities; Space velocities; Stars, distances; Optical
Keywords: Stellar associations ; Open star clusters ; Stellar kinematics ;
Clustering
Abstract:
We present the results of a density-based clustering analysis of the
6D XYZ Galactic positions and UVW-space velocities of nearby (≤200pc)
Gaia Early Data Release 3 stars with radial velocities using HDBSCAN,
in opposition to previous studies (Kounkel & Covey 2019, J/AJ/158/122;
Meingast+ 2021, J/A+A/622/L13) that only included positions and
tangential velocities. Among the 241 recovered clusters, we identify
more than 50 known associations, 32 new candidate stellar streams aged
100Myr to 3Gyr, nine extensions of known Theia groups uncovered by
Kounkel & Covey, and eight newly recognized coronae around nearby open
clusters. Three confirmed exoplanet-hosting stars and three more TESS
transiting exoplanet candidates are part of the new groups discovered
here, including TOI-1807 and TOI-2076 from Hedges+ 2021AJ....162...54H 2021AJ....162...54H
that were suspected to belong to a yet unidentified moving group. The
new groups presented here were not previously recognized because of
their older ages, low spatial density, and projection effects that
spread out the tangential velocities of their nearby comoving members.
Several newly identified structures reach distances within 60pc of the
Sun, providing new grounds for the identification of isolated
planetary-mass objects. The nearest member of the newly recognized
corona of Volans-Carina is V419 Hya, a known young debris disk star at
a distance of 22pc. This study outlines the importance of further
characterization of young associations in the immediate solar
neighborhood, which will provide new laboratories for the precise age
calibration of nearby stars, exoplanets, and substellar objects.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 104 5760 Individual Gaia EDR3 entries recovered as
clusters by HDBSCAN
table2.dat 72 84 Median properties of individual groups recovered
by HDBSCAN which passed all selection criteria
table3.dat 75 157 Median properties of individual groups recovered
by HDBSCAN which failed at least one selection
criterion
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See also:
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)
J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)
J/MNRAS/358/13 : Faint dwarfs in NGC 2547 (Jeffries+, 2005)
J/AJ/131/3016 : Low-mass objects in Upper Scorpius (Slesnick+, 2006)
J/AJ/132/2665 : QUEST2 BRI photometry of Taurus-Auriga PMS (Slesnick+, 2006)
J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)
J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)
J/ApJ/756/L33 : Rvel of 2 hot Jupiters in Praesepe (Quinn+, 2012)
J/ApJ/762/88 : Young stellar kinematic group cand. members (Malo+, 2013)
J/MNRAS/435/1325 : Membership of the ε Cha association (Murphy+, 2013)
J/AJ/147/146 : Spectroscopy of Tuc-Hor candidate members (Kraus+, 2014)
J/A+A/566/A132 : Teff and L for stars in 7 open clusters (Silaj+, 2014)
J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015)
J/MNRAS/452/173 : Nearby young stars in Northern hemisphere (Binks+, 2015)
J/MNRAS/447/1267 : Low-mass members of the Octans association (Murphy+, 2015)
J/A+A/588/A118 : Pr0211 RVs, photometry & activity indexes (Malavolta+, 2016)
J/MNRAS/461/794 : Scorpius-Centaurus K-Type Stars (Pecaut+, 2016)
J/A+A/595/A22 : 9 new open clusters within 500pc from the Sun (Roser+, 2016)
J/ApJ/838/150 : The Taurus-Auriga ecosystem. I. (Kraus+, 2017)
J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)
J/AJ/153/95 : Catalog of Suspected Nearby Young Stars (Riedel+, 2017)
J/MNRAS/473/2465 : New young stars in Pisces Moving Group (Binks+, 2018)
J/ApJ/856/23 : BANYAN. XI. The BANYAN Σ algorithm (Gagne+, 2018)
J/A+A/616/A7 : Gaia DR2 RV standard stars cat. (Soubiran+, 2018)
J/AJ/158/77 : Members of the Pisces-Eridanus stream (Curtis+, 2019)
J/AJ/158/122 : Local structure & SFH of the MW (Kounkel+, 2019)
J/A+A/621/L3 : Hyades tidal tails with Gaia DR2 (Meingast+, 2019)
J/A+A/622/L13 : Stellar stream in Gaia DR2 discovery (Meingast+, 2019)
J/A+A/627/A4 : Praesepe (NGC 2632) and its tidal tails (Roeser+, 2019)
J/ApJ/877/12 : ComaBer & a Neighbor Stellar Group tidal tails (Tang+, 2019)
J/AJ/160/239 : Cluster difference imaging phot. survey. II. (Bouma+, 2020)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
J/ApJ/903/96 : The µTau Association (MUTA) (Gagne+, 2020)
J/A+A/642/A179 : beta Pic moving group RV of 81 stars (Miret-Roig+, 2020)
J/AJ/161/87 : Members of eps Cha with Gaia (Dickson-Vandervelde+, 2021)
J/A+A/649/A6 : Gaia Cat. of Nearby Stars - GCNS (Gaia collaboration, 2021)
J/ApJ/917/23 : SPYGLASS. I. Mapping young stellar structures (Kerr+, 2021)
J/ApJS/254/20 : Stellar groups in Taurus field from Gaia+LAMOST (Liu+, 2021)
J/A+A/645/A84 : Coronae of nearby star clusters (Meingast+, 2021)
J/A+A/647/A19 : 3D Kinematics and age of OCs (Tarricq+, 2021)
J/AJ/161/171 : THYME. V. A new stellar association (Tofflemire+, 2021)
J/A+A/664/A163 : TOI-1807 RV and flux curves (Nardiello+, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Crius [1/241] Crius Group ID
(<[MGC2022] Crius NNN> in Simbad)
5- 23 I19 --- Gaia Gaia EDR3 source ID
25- 26 I2 h RAh Hour of Right Ascension (ICRS) at Ep=2016
28- 29 I2 min RAm Minute of Right Ascension (ICRS) at Ep=2016
31- 36 F6.3 s RAs Second of Right Ascension (ICRS) at Ep=2016
38- 38 A1 --- DE- Sign of the Declination (ICRS) at Ep=2016
39- 40 I2 deg DEd Degree of Declination (ICRS) at Ep=2016
42- 43 I2 arcmin DEm Arcminute of Declination (ICRS) at Ep=2016
45- 49 F5.2 arcsec DEs Arcsecond of Declination (ICRS) at Ep=2016
51- 58 F8.3 mas/yr pmRA [-658/1777] Gaia EDR3 proper motion in RA
60- 64 F5.3 mas/yr e_pmRA [0.006/0.2] Uncertainty in pmRA
66- 74 F9.3 mas/yr pmDE [-1456/551] Gaia EDR3 proper motion in DE
76- 80 F5.3 mas/yr e_pmDE [0.008/0.3] Uncertainty in pmDE
82- 88 F7.3 mas plx [4.99/184] Gaia EDR3 Parallax
90- 94 F5.3 mas e_plx [0.008/0.3] Uncertainty in plx
96-100 F5.1 km/s RVel [-93/108] Gaia EDR3 Radial velocity
102-104 F3.1 km/s e_RVel [0.1/5] Uncertainty in RVel
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Crius [77/241] Crius Group ID
(<[MGC2022] Crius NNN> in Simbad)
5- 7 I3 --- Nstar [8/293] Number of members
9- 10 I2 --- Nruwe [0/33] Number of members with RUWE>1.4
12- 16 F5.1 pc Dist [42.9/196] Distance
18- 23 F6.1 pc X [-189/171.2] Mean position in Galactic X
cartesian coordinate
25- 30 F6.1 pc Y [-174.1/148.3] Mean position in Galactic Y
cartesian coordinate
32- 37 F6.1 pc Z [-122/110.3] Mean position in Galactic Z
cartesian coordinate
39- 43 F5.1 km/s U [-43/23.7] Mean velocity in Galactic X
45- 49 F5.1 km/s V [-29.3/8.5] Mean velocity in Galactic Y
51- 55 F5.1 km/s W [-19.3/5.7] Mean velocity in Galactic Z
57- 60 F4.1 pc Z-mad [1.4/15] Median absolute deviation in Z
62- 64 F3.1 km/s U-mad [0.4/3] Median absolute deviation in U
66- 68 F3.1 km/s V-mad [0.2/2.1] Median absolute deviation in V
70- 72 F3.1 km/s W-mad [0.1/3] Median absolute deviation in W
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Crius [1/223] Crius Group ID
(<[MGC2022] Crius NNN> in Simbad)
5- 6 I2 --- Nstar [7/84] Number of members
8- 12 F5.1 pc Dist [7.3/164] Distance
14- 19 F6.1 pc X [-136.1/138.4] Mean position in Galactic X
cartesian coordinate
21- 26 F6.1 pc Y [-136.3/147.1] Mean position in Galactic Y
cartesian coordinate
28- 33 F6.1 pc Z [-134.2/118.4] Mean position in Galactic Z
cartesian coordinate
35- 40 F6.1 km/s U [-112/64] Mean velocity in Galactic X
42- 46 F5.1 km/s V [-90.1/27.1] Mean velocity in Galactic Y
48- 52 F5.1 km/s W [-42.6/14.3] Mean velocity in Galactic Z
54- 58 F5.1 pc Z-mad [6.8/108.4] Median absolute deviation in Z
60- 62 F3.1 km/s U-mad [0.6/6.2] Median absolute deviation in U
64- 66 F3.1 km/s V-mad [0.4/9.5] Median absolute deviation in V
68- 70 F3.1 km/s W-mad [0.4/8.3] Median absolute deviation in W
72- 75 A4 --- Crit Criteria (1)
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Note (1):
Pass (P) or fail (F) flags that indicate whether a given Crius group
has passed the selection criteria for further study in this work.
The respective character positions refer to the following criteria:
(1) rejection based on the Hercules stream;
(2) rejection based on other high-velocity groups in the UV plane
(U←100km/s, U>60km/s, or V>20km/s);
(3) rejection based on individual UVW MADs above 3km/s;
(4) rejection based on Z MAD above 15pc.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Mar-2025