J/A+A/674/A19 Ellipsoidal var. with possible compact companions (Gomel+ 2023)
Gaia Data Release 3.
Ellipsoidal variables with possible black-hole or neutron star secondaries.
Gomel R., Mazeh T., Faigler S., Bashi D., Eyer L., Rimoldini L., Audard M.,
Mowlavi N., Holl B., Jevardat de Fombelle G., Nienartowicz K., Lecoeur I.,
Wyrzykowski L.
<Astron. Astrophys. 674, A19 (2023)>
=2023A&A...674A..19G 2023A&A...674A..19G (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Photometry ; Stars, variable
Keywords: methods: data analysis - techniques: photometric - binaries : close -
stars: black holes - stars: neutron - stars: variables: general
Abstract:
As part of Gaia Data Release 3, a large number of ellipsoidal
variables were identified with supervised classification. The periodic
variability of these ellipsoidals is presumably induced by tidal
interaction with a companion in a close binary system. We present 6306
short-period probable ellipsoidal variables with relatively
large-amplitude Gaia G-band photometric modulations that indicate a
possible massive, undetected secondary. In case of a main-sequence
primary, the more massive secondary is probably a compact object -
either a black hole or a neutron star, and sometimes a white dwarf.
The identification is based on the recently suggested robust modified
minimum mass ratio (mMMR) that was derived from the observed
ellipsoidal amplitude alone, without the use of the primary mass or
radius. We also list a subset of 262 systems with an mMMR higher than
unity, for which the probability of a compact secondary is higher.
Follow-up observations are needed to verify the true nature of these
variables.
Description:
This catalog contains 262 Gaia DR3 short-period ellipsoidals that were
identified by their large lightcurve modulations. We analysed each
lightcurve, and derived for each system its modified minimum mass
ratio (mMMR). These systems, with an mMMR larger than unity, are
candidates for having compact-object secondaries.
Given below a summary table containing results of the analysis
performed on our 262 candidates with lower-percentile mMMR larger than
unity, in descending mMMR order. The table includes the Gaia DR3 id,
Gaia orbital period, reference time T0 [BJD-2455197.5] which was
chosen so that a2s=0, average G magnitude, and cosine and sine
Fourier coefficients of the three-harmonic model each with its
uncertainty. The table also gives the total number of G-band FoV
transits, the derived mMMR and the lower-percentile mMMR. Each system
parameters are given in a single line.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 235 262 Ellipsoidal variables with possible compact
companions
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
I/358 : Gaia DR3 Part 4. Variability (Gaia Collaboration, 2022)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR3 Gaia DR3 id
21- 28 F8.4 deg RAdeg Right ascension (ICRS) at Ep=2016.0
30- 37 F8.4 deg DEdeg Declination (ICRS) at Ep=2016.0
39- 46 F8.6 d Per Gaia orbital period
48- 55 F8.6 d e_Per Gaia orbital period error
57- 67 F11.6 d T0 Reference time (BJD-2455197.5)
69- 76 F8.6 d e_T0 Reference time error
78- 86 F9.6 mag Gmag Fitted G magnitude
88- 95 F8.6 mag e_Gmag Fitted G magnitude error
97-105 F9.6 --- A1c cosine coefficient of first harmonic
108-115 F8.6 --- e_A1c a1c error
118-125 F8.6 --- A2c cosine coefficient of second harmonic
128-135 F8.6 --- e_A2c a2c error
137-145 F9.6 --- A3c cosine coefficient of third harmonic
148-155 F8.6 --- e_A3c a3c error
157-165 F9.6 --- A1s sine coefficient of first harmonic
168-175 F8.6 --- e_A1s a1s error
178-185 F8.6 --- A2s sine coefficient of second harmonic
188-195 F8.6 --- e_A2s a2s error
197-205 F9.6 --- A3s sine coefficient of third harmonic
208-215 F8.6 --- e_A3s a3s error
218-219 I2 --- N Total number of analyzed points
222-227 F6.4 --- mMMR Modified minimum mass ratio
230-235 F6.4 --- b_mMMR Lower-percentile mMMR
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Acknowledgements:
Roy Gomel, roygomel6(at)gmail.com
(End) Patricia Vannier [CDS] 21-Jun-2022