J/MNRAS/512/2062 10 exoplanet systems transit timing (Basturk+, 2022)
Homogeneous transit timing analyses of 10 exoplanet systems.
Basturk O., Esmer E.M., Yalcinkaya S., Torun S., Mancini L., Helweh F.,
Karamanli E., Southworth J., Alis S., Wunsche A., Tezcan F., Aladag Y.,
Aksaker N., Tunc E., Davoudi F., Fisek S., Bretton M., Evans D.F.,
Yesilyaprak C., Yilmaz M., Tezcan C.T., Yelkenci K.
<Mon. Not. R. Astron. Soc., 512, 2062-2081 (2022)>
=2022MNRAS.512.2062B 2022MNRAS.512.2062B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry
Keywords: methods: observational - techniques: photometric -
planetary systems - stars: individual: HAT-P-23, WASP-37, WASP-69,
WASP-74, HAT-P-56, WASP-2, WASP-14, HAT-P-32, WASP-103, HAT-P-37
Abstract:
We study the transit timings of 10 exoplanets in order to investigate
potential transit timing variations in them. We model their available
ground-based light curves, some presented here and others taken from
the literature, and homogeneously measure the mid-transit times. We
statistically compare our results with published values and find that
the measurement errors agree. However, in terms of recovering the
possible frequencies, homogeneous sets can be found to be more useful,
of which no statistically relevant example has been found for the
planets in our study. We corrected the ephemeris information of all 10
planets we studied and provide these most precise light elements as
references for future transit observations with space-borne and
ground-based instruments. We found no evidence for secular or periodic
changes in the orbital periods of the planets in our sample, including
the ultra-short period WASP-103 b, whose orbit is expected to decay on
an observable time-scale. Therefore, we derive the lower limits for
the reduced tidal quality factors (Q) for the host stars based on
best-fitting quadratic functions to their timing data. We also present
a global model of all available data for WASP-74 b, which has a Gaia
parallax-based distance value 25 per cent larger than the published
value.
Description:
Light curves of 10 exoplanet systems.
Transit timings of 10 exoplanet systems.
HARPS radial velocities of WASP-74.
34 light curves of 10 exoplanet systems obtained with different
telescopes and in different filters listed in Table 3.
Mid-transit timings determined within this study homogeneously, from
all the light curves in the open databases, literature, and that
published here as well as that were reported by the observers. The
data set for Figure 1. Statistics employed during light curve
selection detailed in Section 2.3.
Individiual and binned HARPS radial velocities measured within this
study for WASP-74, median bins (of 5 points) of which is given in
Figure 5 (green points).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 97 35 A log of photometric observations performed
for this study
table4.dat 113 10 Reference ephemeris information (T0 and Porb)
lc/* . 10 Individual light curves for each planet
oc/* . 10 Transit timing data for each planet
wasp74i.dat 36 30 Individual radial velocity measurements
wasp74b.dat 31 6 Binned radial velocity measurements
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See also:
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- System System name
10- 14 A5 --- Tel Telescope
16- 25 A10 "date" Obs.Date Observation date, UTC
26- 28 A3 --- n_Obs.Date Reason for data eliminated and hence
not in the TTV diagrams (1)
30- 37 A8 "h:m:s" Start Start time, UTC
39- 46 A8 "h:m:s" End End time, UTC
48- 52 A5 --- Filter Filter
54- 56 I3 s ExpTime Exposure time
58- 60 I3 --- Nimg Images number
62- 67 F6.3 --- PNR Photometric noise rate
69- 73 F5.3 --- beta β factor that quantifies the red
(or correlated) noise
75- 88 F14.6 d Mid-transit Mid-transit date, BJD-TDB
90- 97 F8.6 d e_Mid-transit Error on Mid transit date
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Note (1): Notes as follows:
a = Eliminated because it is an outlier on TTV diagram.
b = Eliminated because its depth is out of 3σ of the average.
c = Eliminated because it is incomplete.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- System System name
10 A1 --- Planet [b] Planet name within the system
13- 14 I2 h RAh Right ascension (J2000)
16- 17 I2 min RAm Right ascension (J2000)
19- 23 F5.2 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 35 F4.1 arcsec DEs Declination (J2000)
37- 50 F14.6 d T0 Mid-transit time (BJD-TDB)
52- 59 F8.6 d e_T0 Mid-transit time error (BJD-TDB)
61- 70 F10.8 d Porb Orbital period
72- 81 F10.8 d e_Porb Orbital period error
83- 97 A15 --- FileName1 Name of light curve file in subdirectory lc
99-113 A15 --- FileName2 Name of Transit timing data file in
subdirectory oc
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Byte-by-byte Description of file: lc/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Planet Planet Name
10- 14 A5 --- Tel Telescope Name
16- 24 A9 --- Filter Filter Used in Observations
26- 35 A10 "date" Date Starting Date of the Observation in UTC
37- 50 F14.6 d BJD Barycentric Dynamical Time in Julian Days (TDB)
52- 59 F8.6 --- Flux Normalized Flux
61- 68 F8.6 --- e_Flux Error in Normalized Flux Units
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Byte-by-byte Description of file: oc/*
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Bytes Format Units Label Explanations
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1- 14 F14.6 d MidTrTime Measured Mid-Transit Time in BJD-TDB
16- 23 F8.6 d e_MidTrTime Error of the Measured Mid-Transit Time
25- 38 F14.6 d MidTrTimeOrig Observer Mid-Transit Time in BJD-TDB
40- 47 F8.6 d e_MidTrTimeOrig Error of the Observer Mid-Transit Time
49- 53 I5 --- Epoch Epoch of Observation
55- 63 F9.6 d O-C O-C
65- 73 F9.6 d LineResiduals Residuals From The Linear Fit
75- 86 A12 --- Passband Passband of Observation
88- 97 A10 --- LCType Light Curve Type
99-106 F8.6 --- Delta Transit Depth
108-115 F8.6 --- e_Delta Error of the Transit Depth
117-124 F8.6 d T14 Transit Duration
126-133 F8.6 d FWHM FWHM Duration
135-142 F8.6 d e_FWHM Error of the FWHM Duration
144-151 F8.6 d Tau Ingress/egress duration
153-160 F8.6 d e_Tau Error of the Ingress/egress duration
162-165 F4.2 --- Beta Beta (Red Noise Parameter)
167-171 F5.2 --- PNR PNR (White Noise Parameter in ppt)
173-180 F8.6 --- RMSFull RMS Error from the Model
182-192 F11.6 --- Chi2red Reduced Chi-Square of Transit Model
194-200 A7 --- BinaryCode Binary Code for Discard (1)
202 I1 --- Discarded [0/1] 1 if it is discarded,
0 if it is not (2)
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Note (1): Binary Codes start with BC
Note (2): Discarded (0: Used, 1: Discarded)
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Byte-by-byte Description of file: wasp74i.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d BJD Barycentric Dynamical Time in Julian Days (TDB)
18- 27 F10.6 km/s RV Individual Radial Velocity (1)
29- 36 F8.6 km/s e_RV Error of the Radial Velocity Measurement (2)
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Note (1): Not corrected for systemic (gamma) velocity
Note (2): Corrected for Earth's orbital motion
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Byte-by-byte Description of file: wasp74b.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD Barycentric Dynamical Time in Julian Days (TDB)
16- 26 F11.6 m/s RV Binned Radial Velocity (1)
28- 31 F4.2 m/s e_RV Standard deviation of the Binned Radial
Velocity (2)
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Note (1): Corrected for systemic (gamma) velocity and Earth's motion
Note (2): 5 consecutive individual RVs binned by average
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Acknowledgements:
Ozgur Basturk, obasturk(at)ankara.edu.tr,
Ankara University, Ankara, Turkey
(End) Patricia Vannier [CDS] 14-Apr-2022