J/MNRAS/428/1656 Time of minima of HD 181068 (Borkovits+, 2013)
Dynamical masses, absolute radii and 3D orbits of the triply eclipsing star
HD 181068 from Kepler photometry.
Borkovits T., Derekas A., Kiss L.L., Kiraly A., Forgacs-Dajka E.,
Biro I.B., Bedding T.R., Bryson S.T., Huber D., Szabo R.
<Mon. Not. R. Astron. Soc., 428, 1656-1672 (2013)>
=2013MNRAS.428.1656B 2013MNRAS.428.1656B
ADC_Keywords: Binaries, eclipsing ; Ephemerides
Keywords: binaries: close - binaries: eclipsing - stars: individual: HD 181068
Abstract:
HD 181068 is the brighter of the two known triply eclipsing
hierarchical triple stars in the Kepler field. It has been
continuously observed for more than 2yr with the Kepler space
telescope. Of the nine quarters of the data, three have been obtained
in short-cadence mode, that is one point per 58.9s. Here we analyse
this unique data set to determine absolute physical parameters (most
importantly the masses and radii) and full orbital configuration using
a sophisticated novel approach. We measure eclipse timing variations
(ETVs), which are then combined with the single-lined radial velocity
measurements to yield masses in a manner equivalent to double-lined
spectroscopic binaries. We have also developed a new light-curve
synthesis code that is used to model the triple, mutual eclipses and
the effects of the changing tidal field on the stellar surface and the
relativistic Doppler beaming. By combining the stellar masses from the
ETV study with the simultaneous light-curve analysis we determine the
absolute radii of the three stars. Our results indicate that the close
and the wide subsystems revolve in almost exactly coplanar and
prograde orbits. The newly determined parameters draw a consistent
picture of the system with such details that have been beyond reach
before.
Description:
The analysis is based on photometry from the Kepler space telescope.
The data set is 775d long, observed in six quarters (Q1-Q6) at
long cadence (LC; time resolution of 29.4min) and three quarters
(Q7-Q9) at short cadence (SC; time resolution of 58.9s).
Objects:
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RA (2000) DE Designation(s)
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19 17 08.98 +41 15 53.3 HD 181068 = KIC 5952403
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 22 1177 Times of minima for the close pair
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d BJD Barycentric Julian date
14- 19 F6.4 --- sigma [0.0005/0.0010] Weight
21- 22 A2 --- Type [I ] Type of minima (I or II)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Jan-2014