J/AJ/165/193 ∼30000 Gaia EDR3 nearby accelerating stars (Whiting+, 2023)
A Catalog of Nearby Accelerating Star Candidates in Gaia DR3.
Whiting M.L., Hill J.B., Bromley B.C., Kenyon S.J.
<Astron. J., 165, 193 (2023)>
=2023AJ....165..193W 2023AJ....165..193W
ADC_Keywords: Stars, double and multiple; Optical; Proper motions;
Parallaxes, trigonometric
Keywords: Binary stars ; Substellar companion stars ; Multiple stars
Abstract:
We describe a new catalog of accelerating star candidates with Gaia
G≤17.5mag and distances d≤100pc. Designated as the Gaia Nearby
Accelerating Star Catalog (GNASC), it contains 29684 members
identified using a supervised machine-learning algorithm trained on
the Hipparcos-Gaia Catalog of Accelerations (HGCA), Gaia Data Release
2, and Gaia Early Data Release 3. We take advantage of the difference
in observation timelines between the two Gaia catalogs and information
about the quality of the astrometric modeling based on the premise
that acceleration will correlate with astrometric uncertainties.
Catalog membership is based on whether constant proper motion over
three decades can be ruled out at high confidence (greater than
99.9%). Test data suggest that catalog members each have a 68%
likelihood of true astrometric acceleration; subsets of the catalog
perform even better, with the likelihood exceeding 85%. We compare the
GNASC with Gaia Data Release 3 and its table of stars for which
acceleration is detected at high confidence based on precise
astrometric fits. Our catalog, derived without this information,
captures over 96% of the sources in the table that meet our selection
criteria. In addition, the GNASC contains bright, nearby candidates
that were not in the original Hipparcos survey, including members of
known binary systems as well as stars with companions yet to be
identified. It thus extends the HGCA and demonstrates the potential of
the machine-learning approach for discovering hidden partners of
nearby stars in future astrometric surveys.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 234 29684 *Gaia nearby accelerating star catalog
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Note on table2.dat: All columns up to and including the column MPeak
are from the Gaia EDR3 catalog.
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See also:
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/A+A/525/A66 : 4 close binaries BVR light curves (Djurasevic+, 2011)
J/AJ/143/134 : Candidate members of βPic/ABDor groups (McCarthy+, 2012)
J/AJ/147/85 : Solar neighborhood. XXXIII. 45 M dwarfs (Riedel+, 2014)
J/A+A/578/A136 : Period changes in SuperWASP eclipsing binaries (Lohr+, 2015)
J/ApJ/844/103 : Orbit alignment in triple stars (Tokovinin, 2017)
J/other/Nat/563.365 : Barnard's star radial velocity curve (Ribas+, 2018)
J/AJ/160/215 : Solar neighborhood.XLVI. New Mdwarf binaries (Vrijmoet+, 2020)
J/AJ/161/179 : Predicted positions of βPictoris b and c (Brandt+, 2021)
J/ApJS/254/42 : Hipparcos-Gaia (EDR3) Catalog of Accelerations (Brandt, 2021)
J/ApJS/254/10 : Compilation of W UMa stars (Latkovic+, 2021)
J/AJ/162/61 : RVel follow up of Barnard's star with HPF (Lubin+, 2021)
J/MNRAS/517/2925 : ORB6 binaries in Gaia EDR3 (Chulkov+, 2022)
J/A+A/657/A7 : Stellar & substellar companions Gaia EDR3 (Kervella+, 2022)
J/AJ/163/178 : Solar Neighborhood. XLIV. M dwarfs with SOAR (Vrijmoet+, 2022)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- EDR3 Gaia EDR3 source identifier
21- 33 F13.9 deg RAdeg [0/360] Right Ascension (ICRS) at Ep=2016.0
35- 47 F13.9 deg DEdeg [-90/90] Declination (ICRS) at Ep=2016.0
49- 61 F13.9 deg GLON [0/360] Galactic longitude
63- 75 F13.9 deg GLAT [-89/90] Galactic latitude
77- 85 F9.3 mas/yr pmRA [-2248/3430] Proper motion along Right
Ascension
87- 95 F9.3 mas/yr pmDE [-5095/1712] Proper motion along Declination
97-101 F5.3 mas/yr e_pmRA [0.007/2] Uncertainty in pmRA
103-107 F5.3 mas/yr e_pmDE [0.009/1] Uncertainty in pmDE
109-115 F7.3 mas plx [10/375] Parallax
117-125 F9.3 mas e_plx [10/10083] Uncertainty in plx
127-132 F6.3 mag gmag [2.87/17.5] The G-band apparent magnitude
134-139 F6.3 mag BP-RP [-0.48/5.31] The (BP-RP) color
141-147 F7.4 --- RUWE [0.69/89.2] Renormalized unit-weighted error
149-159 F11.4 --- Excess [0.4/117646] Excess noise, astrometry; s.d
161-168 F8.4 --- GoF [-6.95/914] Goodness of fit, astrometry
170-174 A5 --- Dup Duplicated source flag; True or False
176-178 I3 % MPeak [0/100] Fields w/multiple peaks
180-198 I19 --- DR2 Gaia DR2 source identifier
200-208 F9.3 mas/yr pmRA2 [-2251/3430] Gaia DR2 proper motion along RA
210-218 F9.3 mas/yr pmDE2 [-5097/1714] Gaia DR2 proper motion along DE
220 I1 --- NSSFlag [0/3] NSS table flag (1)
222 I1 --- NKnown [0/2] Number of neighbors, known parallax (2)
224-225 I2 --- NUnKnown [0/53] Number of neighbors, unknown parallax
(2)
227-234 F8.3 --- chi2 [28.7/5994] Predicted linear drift chi2 (3)
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Note (1): Flags as follows:
0 = not a Gaia DR3 nss source
1 = nss_acceleration source
2 = nss_twobody source
Note (2): The number of Gaia EDR3 neighbors within 200AU of each source.
Note (3): This χ2 value is the machine Learning estimate from
the hypothesis that a source has no acceleration. The minimum value
for sources reported here is 28.75, corresponding to a 5-sigma outlier
from the expected distribution of non-accelerating sources.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 19-Sep-2023