J/A+A/666/A61 V773Tau B circumbinary disc (Kenworthy+, 2022)
Eclipse of the V773 Tau B circumbinary disc.
Kenworthy M.A., Gonzalez Picos D., Elizondo E., Martin R.G., van Dam D.M.,
Rodriguez J.E., Kennedy G.M., Ginski C., Mugrauer M., Vogt N., Adam C.,
Oelkers R.J.
<Astron. Astrophys. 666, A61 (2022)>
=2022A&A...666A..61K 2022A&A...666A..61K (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, CCD ; Stars, double and multiple
Keywords: (stars:) binaries: general - eclipses - protoplanetary disks
Abstract:
Young multiple stellar systems can host both circumstellar and
circumbinary disks composed of gas and dust, and the orientations of
circumbinary disks can be sculpted by the orientation and eccentricity
of the central binaries. Studying multiple binary systems and their
associated disks enables understanding of the size and distribution of
the planetary systems that subsequently form around them.
A deep (∼70%) and extended (∼150 days) eclipse was seen towards the
young multiple stellar system V773 Tau in 2010. We interpret it as
being due to the passage of a circumbinary disc around the B
components moving in front of the A components. Our aim is to
characterise the orientation and structure of the disc, to refine the
orbits of the sub-components, and to predict when the next eclipse
will occur.
We combine the photometry from several ground based surveys, construct
a model for the light curve of the eclipse, and use high angular
resolution imaging to refine the orbits of the three components of the
system, A, B and C. Frequency analysis of the light curves, including
from the TESS satellite, enables characterisation of the rotational
periods of the Aa and Ab stars.
A toy model of the circumbinary disk shows that it extends out to
approximately 5 au around the B binary and has an inclination of 73
with respect to the orbital plane of AB, where the lower bound of the
radius of the disk is constrained by the geometry of the AB orbit and
the upper bound is set by the stability of the disk. We identify
several frequencies in the photometric data that we attribute to
rotational modulation of the Aa and Ab stellar companions. We produce
the first determination of the orbit of the more distant C component
around the AB system and limit its inclination to 93°.
The high inclination and large diameter of the disk, together with the
match from theory suggest that B is an almost equal mass, moderately
eccentric binary. We identify the rotational periods of the Aa and Ab
stars, identify a third frequency in the light curve that we attribute
to the orbital period of the stars in the B binary. We predict that
the next eclipse will be around 2037, during which both detailed
photometric and spectroscopic monitoring will characterise the disk in
greater detail.
Description:
Photometry from several ground based surveys (ASAS, ASAS-SN, KELT and
PTF) of the stellar system V773 Tau. All light curves have been
normalised to unity outside of the eclipse, as indicated by a flag in
the data table.
Objects:
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RA (2000) DE Designation(s)
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04 14 12.93 +28 12 12.4 V773 Tau = HD 283447
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
v773tau.dat 66 1770 Photometry of V773 Tau
list.dat 72 1 Information on fits image
fits/* . 1 fits image
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Byte-by-byte Description of file: v773tau.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Survey The name of the photometry survey
9- 26 F18.13 d Time Epoch (MJD-50000)
28- 45 F18.16 --- Flux Normalised flux
47- 64 F18.16 --- e_Flux Error on normalised flux
66 I1 --- Eclipse [0/1] Whether the photometry is during the
eclipse (1 for true)
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension of center (J2000)
4- 5 I2 min RAm Right Ascension of center (J2000)
7- 11 F5.2 s RAs Right Ascension of center (J2000)
12 A1 --- DE- Declination of center sign (J2000)
13- 14 I2 deg DEd Declination of center sign (J2000)
16- 17 I2 arcmin DEm Declination of center sign (J2000)
19- 22 F4.1 arcsec DEs Declination of center sign (J2000)
24- 27 I4 --- Nx Number of pixels along X-axis
29- 32 I4 --- Ny Number of pixels along Y-axis
34- 37 I4 Kibyte size Size of FITS file
39- 50 A12 --- FileName Name of FITS file, in subdirectory fits
52- 72 A21 --- Title Title of the FITS file
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Acknowledgements:
Matthew A. Kenworthy, kenworthy(at)strw.leidenuniv.nl
(End) Patricia Vannier [CDS] 11-Aug-2022