J/A+A/566/A128 Period variations in SuperWASP PCEB (Lohr+, 2014)
Period and amplitude variations in post-common-envelope eclipsing
binaries observed with SuperWASP.
Lohr M.E., Norton A.J., Anderson D.R., Collier Cameron A., Faedi F.,
Haswell C.A., Hellier C., Hodgkin S.T., Horne K., Kolb U.C., Maxted P.F.L.,
Pollacco D., Skillen I., Smalley B., West R.G., Wheatley P.J.
<Astron. Astrophys. 566, A128 (2014)>
=2014A&A...566A.128L 2014A&A...566A.128L
ADC_Keywords: Binaries, eclipsing ; Stars, variable ; Ephemerides
Keywords: stars: variables: general - binaries: close - binaries: eclipsing
Abstract:
Period or amplitude variations in eclipsing binaries may reveal the
presence of additional massive bodies in the system, such as
circumbinary planets. Here, we have studied twelve previously-known
eclipsing post-common-envelope binaries for evidence of such light
curve variations, on the basis of multi-year observations in the
SuperWASP archive. The results for HW Vir provided strong evidence for
period changes consistent with those measured by previous studies, and
help support a two-planet model for the system. ASAS J102322-3737.0
exhibited plausible evidence for a period increase not previously
suggested; while NY Vir, QS Vir and NSVS 14256825 afforded less
significant support for period change, providing some confirmation to
earlier claims. In other cases, period change was not convincingly
observed; for AA Dor and NSVS 07826147, previous findings of constant
period were confirmed. This study allows us to present hundreds of new
primary eclipse timings for these systems, and further demonstrates
the value of wide-field high-cadence surveys like SuperWASP for the
investigation of variable stars.
Description:
Times of light curve primary minima for 11 post-common-envelope
eclipsing binaries are presented here, as determined from SuperWASP
archive photometry, with uncertainties. For each object there are two
tables, one giving times selected as reliable and used in period
change determinations as described in the paper, and one giving
additional times rejected by our code as less reliable and/or with
large uncertainties.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
stars.dat 66 11 List of studied stars
tablea1.dat 23 163 Good times of minima for AA Dor
tablea2.dat 23 143 Extra times for AA Dor
tablea3.dat 23 245 Good times for ASAS J102322-3737.0
tablea4.dat 23 61 Extra times for ASAS J102322-3737.0
tablea5.dat 23 265 Good times for EC 10246-2707
tablea6.dat 23 149 Extra times for EC 10246-2707
tablea7.dat 23 182 Good times for HS 2231+2441
tablea8.dat 23 78 Extra times for HS 2231+2441
tablea9.dat 23 179 Good times for HW Vir
tablea10.dat 23 94 Extra times for HW Vir
tablea11.dat 23 97 Good times for 2MASS J19383260+4603591
tablea12.dat 23 21 Extra times for 2MASS J19383260+4603591
tablea13.dat 23 221 Good times for NSVS 07826147
tablea14.dat 23 100 Extra times for NSVS 07826147
tablea15.dat 23 133 Good times for NSVS 14256825
tablea16.dat 23 48 Extra times for NSVS 14256825
tablea17.dat 23 209 Good times for NY Vir
tablea18.dat 23 74 Extra times for NY Vir
tablea19.dat 23 95 Good times for DE CVn
tablea20.dat 23 55 Extra times for DE CVn
tablea21.dat 23 142 Good times for QS Vir
tablea22.dat 23 78 Extra times for QS Vir
--------------------------------------------------------------------------------
Byte-by-byte Description of file: stars.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 23 A23 --- Name Star name
26- 27 I2 h RAh Right ascension (J2000)
29- 30 I2 min RAm Right ascension (J2000)
32- 36 F5.2 s RAs Right ascension (J2000)
38 A1 --- DE- Declination sign (J2000)
39- 40 I2 deg DEd Declination (J2000)
42- 43 I2 arcmin DEm Declination (J2000)
45- 48 F4.1 arcsec DEs Declination (J2000)
50- 58 A9 --- File.g Name of the table with Good times of minima
59- 67 A9 --- File.e Name of the table with Extra times
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea*.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 F14.6 d BJD Barycentric Julian date of minimum
16- 23 F8.6 d e_BJD Uncertainty in time of minimum
--------------------------------------------------------------------------------
Acknowledgements:
Marcus Lohr, Marcus.Lohr(at)open.ac.uk
(End) Marcus Lohr [OU, UK], Patricia Vannier [CDS] 22-May-2014