J/AJ/164/184 ARMADA. II. Binaries astrometry & radial velocity (Gardner+, 2022)
ARMADA. II.
Further Detections of Inner Companions to Intermediate-mass Binaries with
Microarcsecond Astrometry at CHARA and VLTI.
Gardner T., Monnier J.D., Fekel F.C., Le Bouquin J.-B., Scovera A.,
Schaefer G., Kraus S., Adams F.C., Anugu N., Berger J.-P.,
Ten Brummelaar T., Davies C.L., Ennis J., Gies D.R., Johnson K.J.C.,
Kervella P., Kratter K.M., Labdon A., Lanthermann C., Sahlmann J.,
Setterholm B.R.
<Astron. J., 164, 184 (2022)>
=2022AJ....164..184G 2022AJ....164..184G
ADC_Keywords: Stars, double and multiple; Spectra, infrared; Positional data;
Radial velocities
Keywords: Astrometric binary stars ; Multiple stars ; Astrometry ; Long
baseline interferometry ; Trinary stars ; Spectroscopic binary
stars
Abstract:
We started a survey with CHARA/MIRC-X and VLTI/GRAVITY to search for
low-mass companions orbiting individual components of
intermediate-mass binary systems. With the incredible precision of
these instruments, we can detect astrometric "wobbles" from companions
down to a few tens of microarcseconds. This allows us to detect any
previously unseen triple systems in our list of binaries. We present
the orbits of 12 companions around early F- to B-type binaries, 9 of
which are new detections and 3 of which are first astrometric
detections of known radial velocity (RV) companions. The masses of
these newly detected components range from 0.45 to 1.3M☉. Our
orbits constrain these systems to a high astrometric precision, with
median residuals to the orbital fit of 20-50µas in most cases. For
seven of these systems we include newly obtained RV data, which help
us to identify the system configuration and to solve for masses of
individual components in some cases. Although additional RV
measurements are needed to break degeneracy in the mutual inclination,
we find that the majority of these inner triples are not well aligned
with the wide binary orbit. This hints that higher-mass triples are
more misaligned compared to solar and lower-mass triples, though a
thorough study of survey biases is needed. We show that the ARMADA
survey is extremely successful at uncovering previously unseen
companions in binaries. This method will be used in upcoming papers to
constrain companion demographics in intermediate-mass binary systems
down to the planetary-mass regime.
Description:
Data for the ARrangement for Micro-Arcsecond Differential Astrometry
(ARMADA) survey are taken in H band with the Michigan Infrared
Combiner-Exeter (MIRC-X) instrument at the Center for High Angular
Resolution Astronomy (CHARA) Array. The CHARA Array is the
optical/near-IR interferometer with the longest baselines in the
world. MIRC-X combines all six telescopes available at CHARA with
baselines up to 330m. The original MIRC instrument is described in
detail, and in 2017 July the detector and combiner were upgraded to
MIRC-X. Observations for the ARMADA survey are all taken in grism
(R∼190) mode, allowing us to detect components out to ∼200mas with the
larger interferometric field of view.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 75 225 Binary star astrometry
table2.dat 29 380 Binary star radial velocities
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2020)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+AS/141/371 : Low-mass stars evolution tracks & isochrones (Girardi+, 2000)
J/AJ/119/3084 : ICCD speckle obs. of binary stars. XXIII. (Hartkopf+, 2000)
J/AJ/123/1023 : Binary star orbits (Seymour+, 2002)
J/A+A/459/137 : Bright Be shell stars (Rivnius+, 2006)
J/AJ/138/813 : Speckle interferometry at Mount Wilson Obs. (Hartkopf+, 2009)
J/AJ/140/1657 : PHASES diff. astrometry data archive. V. (Muterspaugh+, 2010)
J/A+A/546/A69 : Orbits of visual binaries and dynamical masses (Malkov+, 2012)
J/AJ/145/111 : Radial velocities of five spectroscopic binaries (Fekel+, 2013)
J/MNRAS/455/4136 : Kepler triples (Borkovits+, 2016)
J/AJ/152/213 : Interferometry & spectroscopy sigma Orionis (Schaefer+, 2016)
J/ApJ/844/103 : Orbit alignment in triple stars (Tokovinin, 2017)
J/ApJS/235/6 : Updated Multiple Star Catalog; Sept 2021 (Tokovinin, 2018)
J/A+A/623/A72 : Binarity Hipparcos stars from Gaia pm anomaly (Kervella+, 2019)
J/A+A/626/A20 : MONOS. I. Spectral classifications (Maiz Apellaniz+, 2019)
J/AJ/158/13 : The first 300 stars observed by the GPIES (Nielsen+, 2019)
J/ApJS/247/11 : RV photon limits well-characterized F-M stars (Reiners+, 2020)
J/AJ/161/295 : Obs. Differential Speckle Survey Instrument. X. (Horch+, 2021)
J/A+A/657/A7 : Stellar & substellar companions Gaia EDR3 (Kervella+, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD identifier
8- 12 A5 --- Comp Composant
14- 23 F10.4 d MJD [58027/59555] Modified Julian Date
25- 32 F8.4 mas Sep [0.34/142] Separation
34- 41 F8.4 deg PA [0.72/359] Position Angle (2)
43- 50 F8.6 mas errMaj [0.01/0.7] Uncertainty in the Semi-Major axis
52- 58 F7.5 mas errMin [0.005/0.57] Uncertainty in the Semi-Minor axis
60- 67 F8.4 deg e_PA [0.7/359] Position angle of errMaj (1)
69- 75 A7 --- Inst Instrument used
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Note (1): Measured East of North.
Note (2): Pointing from primary (brightest in H/K) to secondary.
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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- 6 I6 --- HD HD identifier
8- 9 A2 --- Comp Composant
11- 20 F10.4 d MJD [59222/59677] Modified Julian Date
22- 25 F4.1 km/s RVel [-48/103] Radial velocity
27- 29 F3.1 km/s e_RVel [1/4] Uncertainty in RVel
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History:
From electronic version of the journal
References:
Gardner et al. Paper I : 2021AJ....161...40G 2021AJ....161...40G
(End) Prepared by [AAS], Coralie Fix [CDS], 28-Nov-2022