J/AJ/165/81 CHIRON radial velocity of V907 Sco system components (Zasche+, 2023)
V907 Sco Switched to the Eclipsing Mode Again.
Zasche P., Vokrouhlicky D., Barlow B.N., Masek M.
<Astron. J., 165, 81 (2023)>
=2023AJ....165...81Z 2023AJ....165...81Z
ADC_Keywords: Exoplanets; Stars, double and multiple; Spectra, optical;
Radial velocities
Keywords: Multiple stars
Abstract:
V907Scorpii is a unique triple system in which the inner binary
component has been reported to have switched on and off eclipses
several times in modern history. In spite of its peculiarity,
observational data on this system are surprisingly scarce. Here we
make use of the recent Transiting Exoplanet Survey Satellite
observations, as well as our own photometric and spectroscopic data,
to expand the overall data set and study the V907Sco system in more
detail. Our analysis provides both new and improved values for several
of its fundamental parameters: (I) the masses of the stars in the
eclipsing binary are 2.74±0.02M☉ and 2.56±0.02M☉; and
(II) the third component is a solar-type star with mass
1.06-0.10+0.11M☉ (90% C.L.), orbiting the binary on an
elongated orbit with an eccentricity of 0.47±0.02 and a period of
142.01±0.05days. The intermittent intervals of time when eclipses
of the inner binary are switched on and off are caused by a mutual
26.2°-2.2+2.6 inclination of the inner- and outer-orbit
planes, and a favorable inclination of about 71° of the total
angular momentum of the system. The nodal precession period is
Pν=63.5-2.6+3.3yr. The inner binary will remain eclipsing for
another ∼26yr, offering an opportunity to significantly improve the
parameters of the model. This is especially true during the next
decade when the inner-orbit inclination will increase to nearly
90°. Further spectroscopic observations are also desirable, as
they can help to improve constraints on the system's orbital
architecture and its physical parameters.
Description:
Our new spectroscopic observations of V907Sco were obtained using the
CHIRON echelle high-resolution spectrograph (R∼28000) mounted on a
1.5m SMARTS telescope at CTIO observatory located on Cerro Tololo,
Chile. Altogether, we have 66 spectra taken in between 2022 March and
October. Typical exposure times were 480s, and the usable spectral
range covered a wavelength range of 450-890nm.
Objects:
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RA (2000) DE Designation(s) (Period)
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17 56 55.56 -34 45 01.2 V907 Sco = CD-34 12293 (P=142.01d)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 32 66 Radial velocities of stars in the inner binary of
V907 Sco measured by the reSPEFO 2 package
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2020)
J/MNRAS/448/946 : Kepler eclipse timing variation analyses (Borkovits+, 2015)
J/A+A/609/A46 : Light curves of 6 MC eclipsing binaries (Jurysek+, 2018)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d HJD [59667/59867] Heliocentrc Julian date; HJD-2400000
12- 17 F6.1 km/s RVel1 [-152/111] Primary radial velocity
19- 21 F3.1 km/s e_RVel1 [0.4/3] Error on RVel1
23- 28 F6.1 km/s RVel2 [-144/102]? Secondary radial velocity
30- 32 F3.1 km/s e_RVel2 [0.3/2]? Error on RVel2
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History:
From electronic version of the journal
(End) Prepared by Coralie Fix [CDS], 13-Nov-2023