J/MNRAS/522/29 15000 ellipsoidal binary candidates in TESS (Green+, 2023)
15 000 ellipsoidal binary candidates in TESS:
Orbital periods, binary fraction, and tertiary companions.
Green M.J., Maoz D., Mazeh T., Faigler S., Shahaf S., Gomel R.,
El-Badry K., Rix H.-W.
<Mon. Not. R. Astron. Soc., 522, 29-55 (2023)>
=2023MNRAS.522...29G 2023MNRAS.522...29G (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, orbits ; Optical
Keywords: binaries: close - binaries: general - catalogues - stars: statistics -
binaries: eclipsing - binaries: spectroscopic
Abstract:
We present a homogeneously selected sample of 15779 candidate binary
systems with main sequence primary stars and orbital periods shorter
than 5d. The targets were selected from TESS full-frame image light
curves on the basis of their tidally induced ellipsoidal modulation.
Spectroscopic follow-up suggests a sample purity of 83±13 per cent.
Injection-recovery tests allow us to estimate our overall completeness
as 28±3 per cent with Porb<3d and to quantify our selection
effects. 39±4 per cent of our sample are contact binary systems, and
we disentangle the period distributions of the contact and detached
binaries. We derive the orbital period distribution of the
main-sequence binary population at short orbital periods, finding a
distribution continuous with the lognormal distribution previously
found for solar-type stars at longer periods, but with a significant
steepening at Porb≲3d, and a pile-up of contact binaries at
Porb~=0.4d. Companions in the period range of 1-5 dare an order of
magnitude more frequent around stars hotter than ∼6250K (the Kraft
break) when compared to cooler stars, suggesting that magnetic braking
shortens the lifetime of cooler binary systems. However, the period
distribution in the range 1-10d is independent of temperature. We
detect resolved tertiary companions to 9.0±0.2 per cent of our
binaries with a median separation of 3200au. The frequency of tertiary
companions rises to 29±5 per cent among the systems with the
shortest ellipsoidal periods. This large binary sample with quantified
selection effects will be a powerful resource for future studies of
detached and contact binary systems with Porb<5d.
Description:
Table 2 includes results of all 9 million lightcurves analysed by us.
This includes the suggested period, but note that if the target is not
an ellipsoidal binary, the period will be bogus. Use with caution.
Table 3 includes details of all 15779 targets selected as ellipsoidal
binary candidates. See the paper for further information
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 199 8975643 Results for all TESS input targets
table3.dat 111 15779 Selected ellipsoidal candidates
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See also:
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 I11 --- TIC TIC identification number
13- 24 F12.8 deg RAdeg Right ascension (J2000)
26- 37 F12.8 deg DEdeg Declination (J2000)
39- 46 F8.6 --- Score [0/1] Assigned score
48- 59 E12.6 --- a1c Measured amplitude a1c (1)
61- 72 E12.6 --- e_a1c rms uncertainty on a1c (1)
74- 85 E12.6 --- a2c Measured amplitude a2c (1)
87- 98 E12.6 --- e_a2c rms uncertainty on a2c (1)
100-111 E12.6 --- a3c Measured amplitude a3c (1)
113-124 E12.6 --- e_a3c rms uncertainty on a3c (1)
126-137 E12.6 --- a1s Measured amplitude a1s (1)
139-150 E12.6 --- e_a1s rms uncertainty on a1s (1)
152-163 E12.6 --- a3s Measured amplitude a3s (1)
165-176 E12.6 --- e_a3s rms uncertainty on a3s (1)
178-186 F9.6 d Porb Orbital period
188-199 E12.6 --- chisq ?=- chi2 of the best-fitting model
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Note (1): a constants represent the various amplitudes defined in
equations (2)-(8) of the paper.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- TIC TIC identification number
11- 22 F12.8 deg RAdeg Right ascension (J2000)
24- 35 F12.8 deg DEdeg Declination (J2000)
37- 44 F8.6 --- Score [0/1] Assigned score
46- 50 I5 K Teff Effective temperature
52- 57 F6.3 mag Tmag TESS magnitude
59- 67 F9.6 d Porb Orbital period
69- 77 F9.7 d e_Porb rms uncertainty on Porb
79- 92 F14.6 d T0 Time of reference epoch (JD)
94-102 F9.7 d e_T0 rms uncertainty on T0 (JD)
104-111 F8.6 --- Pcb [0/1]?=- Probability of contact binary
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Acknowledgements:
Matthew Green, mjgreenastro(at)gmail.com
(End) Patricia Vannier [CDS] 27-Jun-2023