J/AJ/160/215 The solar neighborhood.XLVI. New M dwarf binaries (Vrijmoet+, 2020)
The solar neighborhood.
XLVI. Revealing new M dwarf binaries and their orbital architectures.
Vrijmoet E.H., Henry T.J., Jao W.-C., Dieterich S.B.
<Astron. J., 160, 215 (2020)>
=2020AJ....160..215V 2020AJ....160..215V
ADC_Keywords: Stars, dwarfs; Stars, double and multiple; Photometry, VRI;
Parallaxes, trigonometric; Proper motions; Positional data
Keywords: Astrometric binary stars ; Astrometry ; M stars ;
Trigonometric parallax ; Low mass stars ; Binary stars
Abstract:
We use 20yr of astrometric data from the REsearch Consortium On Nearby
Stars (RECONS) program on the Cerro Tololo Inter-American
Observatory/SMARTS 0.9m telescope to provide new insight into multiple
star systems in the solar neighborhood. We provide new and updated
parallaxes for 210 systems and derive nine high-quality astrometric
orbits with periods of 2.49-16.63yr. Using a total of 542 systems
parallaxes from RECONS, we compare systems within 25pc to Gaia DR2 to
define criteria for selecting unresolved astrometric multiples from
the DR2 results. We find that three out of four unresolved multistar
red dwarf systems within 25pc in DR2 have parallax_error ≥0.32mas,
astrometricgofal≥56, astrometricexcess-noisesig≥108.0,
ruwe≥2.0, and parallaxes more than ∼10% different from the long-term
RECONS results. These criteria have broad applications to any work
targeting nearby stars, from studies seeking binary systems to efforts
targeting single stars for planet searches.
Description:
We use 20yr of astrometric data from the REsearch Consortium On Nearby
Stars (RECONS) program on the Cerro Tololo Inter-American
Observatory/SMARTS 0.9m telescope to provide new insight into multiple
star systems in the solar neighborhood. We provide new and updated
parallaxes for 210 systems and derive nine high-quality astrometric
orbits with periods of 2.49-16.63yr. Using a total of 542 systems
parallaxes from RECONS, we compare systems within 25pc to Gaia DR2 to
define criteria for selecting unresolved astrometric multiples from
the DR2 results.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 152 216 New and updated results from the RECONS astrometry
program
table2.dat 128 582 Astrometric solutions from RECONS and Gaia DR2 for
red dwarfs within 25pc common to both these
catalogs
--------------------------------------------------------------------------------
See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/AJ/106/773 : Mass-luminosity relation (Henry+, 1993)
J/AJ/147/94 : Solar neighborhood. XXXII. L and M dwarfs (Dieterich+, 2014)
J/AJ/147/85 : Solar neighborhood. XXXIII. 45 M dwarfs (Riedel+, 2014)
J/A+A/577/A128 : CARMENES input catalogue of M dwarfs.I (Alonso-Floriano+,2015)
J/AJ/150/6 : Solar neighborhood.XXXVI. VRI variab. M dwarfs (Hosey+, 2015)
J/AJ/152/141 : Solar neighborhood. XXXVII. RVs for M dwarfs (Benedict+, 2016)
J/AJ/154/151 : The solar neighborhood .XXXX. New young stars (Bartlett+,2017)
J/AJ/154/124 : M dwarfs-long-term photometric variability (Clements+, 2017)
J/A+A/597/A47 : CARMENES input catalogue M dwarfs II (Cortes-Contreras+, 2017)
J/AJ/153/71 : Kepler follow-up observation program.I. Imaging (Furlan+,2017)
J/AJ/154/191 : The solar neighborhood. XLII. New nearby subdwarfs (Jao+,2017)
J/AJ/154/32 : Solar neighborhood.XXXIX. Near white dwarfs (Subasavage+,2017)
J/AJ/153/14 : Solar neighborhood XXXVIII. Near M dwarf (Winters+, 2017)
J/AJ/155/265 : The solar neighborhood. XLIV. RECONS discoveries (Henry+,2018)
J/AJ/156/49 : The solar neighborhood. XLIII. New nearby stars (Riedel+,2018)
J/AJ/156/102 : The TESS Input Catalog & Candidate Target List (Stassun+,2018)
J/A+A/623/A72 : Binarity of Hipparcos stars from Gaia anomaly (Kervella+,2019)
J/A+A/628/A81 : Gaia DR2-based catalogue of 237 Ap stars (Scholz+, 2019)
J/AJ/157/216 : Stellar multiplicity rate M dwarfs within 25pc (Winters+,2019)
J/AJ/159/290 : RVs of 12 spectroscopic binaries M-dwarfs (Winters+, 2020)
J/AJ/159/19 : SOAR TESS survey. I. (Ziegler+, 2020)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name System identifier
19- 20 I2 h RAh [0/23] Hour of Right Ascension (J2000)
22- 23 I2 min RAm Minute of Right Ascension (J2000)
25- 29 F5.2 s RAs Second of Right Ascension (J2000)
31 A1 --- DE- [±] Sign of the Declination (J2000)
32- 33 I2 deg DEd Degree of Declination (J2000)
35- 36 I2 arcmin DEm Arcminute of Declination (J2000)
38- 41 F4.1 arcsec DEs Arcsecond of Declination (J2000)
43 A1 --- Filt Filter used; 114 V, 48 R or 54 I
45- 47 A3 --- Nsea Number of seasons
49- 51 I3 --- Nfrm [21/287] Number of frames
53- 59 F7.2 yr Cover-b [1999/2017] Beginning of time coverage
61- 67 F7.2 yr Cover-e [2003/2021] End of time coverage
69- 73 F5.2 yr Dur [2.83/20.2] Duration of time coverage
75- 76 I2 --- Nref [4/15] Number of reference stars used
78- 83 F6.2 mas plx-rel [8.37/277.22] Relative parallax
85- 88 F4.2 mas e_plx-rel [0.47/4.93] Uncertainty in plx-rel
90- 93 F4.2 mas plx-cor [0.14/2.97] Correction to parallax (1)
95- 98 F4.2 mas e_plx-cor [0/0.76] Uncertainty in plx-cor
100-105 F6.2 mas plx-abs [9.48/279] Final absolut parallax
107-110 F4.2 mas e_plx-abs [0.49/4.94] Uncertainty in plx-abs
112-117 F6.1 mas/yr pm [13.7/4697.7] Proper motion
119-122 F4.2 mas/yr e_pm [0.1/3.4] Uncertainty in pm
124-128 F5.1 deg theta [2.9/359] Position angle of proper motion
130-132 F3.1 deg e_theta [0/2.6] Uncertainty in theta
134-138 F5.1 km/s Vtan [2/310] Tangential velocity
140-152 A13 --- Notes Additional notes (2)
--------------------------------------------------------------------------------
Note (1): Based on reference star photometric distances.
Note (2): Notes as follows:
update = update to a previously-published result for this system in
the Solar Neighborhood series (69 occurrences)
orbit = a preliminary orbit has been fit to improve the astrometry
(13 occurrences)
PB = the astrometry shows a perturbation that does not yet permit an
orbit fit (43 occurrences)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Name System identifier
19- 20 I2 h RAh [0/23] Hour of Right Ascension (J2000)
22- 23 I2 min RAm Minute of Right Ascension (J2000)
25- 29 F5.2 s RAs Second of Right Ascension (J2000)
31 A1 --- DE- [-/+] Sign of the Declination (J2000)
32- 33 I2 deg DEd Degree of Declination (J2000)
35- 36 I2 arcmin DEm Arcminute of Declination (J2000)
38- 41 F4.1 arcsec DEs Arcsecond of Declination (J2000)
43- 48 F6.2 mas plxRECO [34.2/769.66] RECONS absolute parallax
50- 53 F4.2 mas e_plxRECO [0.48/5.28] Uncertainty in RECOplx
55- 59 A5 --- r_plxRECO Reference for RECOplx (1)
61- 67 F7.3 mas plxGDR2 [36.634/768.5]? Gaia DR2 absolute parallax
69- 73 F5.3 mas e_plxGDR2 [0.024/1.387]? Uncertainty in GDR2plx
75- 81 F7.3 --- GofF [0.74/953]? Goodness-of-fit; quality of
astrometric fit
83- 88 F6.3 mas Ex [0/18]? Difference between DR2 data and
astrometic fit
90- 97 F8.1 --- Exsig [0/112000]? Significance of excess noise
99-101 I3 --- Ngood [42/829]? Number of observations not
downweighted (2)
103-104 I2 --- Nbad [0/79]? Number of observations downweighted (2)
106-109 F4.1 % Ratio [0/27.3]? Ratio of Nbad to Ngood
111-116 F6.3 --- RUWE [0.75/43.3]? Renormalized unit weight error
118-122 F5.2 mag Gmag [5.48/19.1]? Gaia DR2 G band apparent magnitude
124-126 A3 --- Class System classification (3)
128 A1 --- Sus [X] Meets criteria for potential unresolved
multiplicity (97 occurrences)
--------------------------------------------------------------------------------
Note (1): References as follows:
* = This work
Bar17 = Bartlett+, 2017, J/AJ/154/151
Ben16 = Benedict+, 2016, J/AJ/152/141
Dav15 = Davison+, 2015AJ....149..106D 2015AJ....149..106D
Die14 = Dieterich+, 2014, J/AJ/147/94
Hen18 = Henry+, 2018, J/AJ/155/265
Jao05 = Jao+, 2005AJ....129.1954J 2005AJ....129.1954J
Jao11 = Jao+, 2011AJ....141..117J 2011AJ....141..117J
Jao17 = Jao+, 2017, J/AJ/154/191
Lur14 = Lurie+, 2014AJ....148...91L 2014AJ....148...91L
Rie10 = Riedel+, 2010AJ....140..897R 2010AJ....140..897R
Rie14 = Riedel+, 2014, J/AJ/147/85
Rie18 = Riedel+, 2018, J/AJ/156/49
Sub09 = Subasavage+, 2009AJ....137.4547S 2009AJ....137.4547S
Sub17 = Subasavage+, 2017, J/AJ/154/32
Win17 = Winters+, 2017, J/AJ/153/14
Note (2): In the computation of the astrometric solution.
Note (3): Classification as follows:
PB = system with a perturbation in its RECONS astrometric residual
(33 occurrences)
res = individual component of a resolved multiple (82 occurrences)
unr = unresolved multiple (114 occurrences)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
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(End) Prepared by [AAS], Coralie Fix [CDS], 20-Jan-2021