J/AJ/154/49 Transiting Exoplanet Monitoring Project. II. HAT-P-33 (Wang+, 2017)
Transiting Exoplanet Monitoring Project (TEMP). II. Refined system parameters
and Transit Timing analysis of HAT-P-33b.
Wang Y.-H., Wang S., Liu H.-G., Hinse T.C., Laughlin G., Wu D.-H.,
Zhang X., Zhou X., Wu Z., Zhou J.-L., Wittenmyer R.A., Eastman J.,
Zhang H., Hori Y., Narita N., Chen Y., Ma J., Peng X., Zhang T.-M., Zou H.,
Nie J.-D., Zhou Z.-M.
<Astron. J., 154, 49-49 (2017)>
=2017AJ....154...49W 2017AJ....154...49W (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry, RI
Keywords: planetary systems - planets and satellites: fundamental parameters -
planets and satellites: individual HAT-P-33b -
stars: fundamental parameters - stars: individual: HAT-P-33 -
techniques: photometric
Abstract:
We present 10 R-band photometric observations of eight different
transits of the hot Jupiter HAT-P-33b, which has been targeted by our
Transiting Exoplanet Monitoring Project. The data were obtained by two
telescopes at the Xinglong Station of National Astronomical
Observatories of China (NAOC) from 2013 December through 2016 January,
and exhibit photometric scatter of 1.6-3.0mmag. After jointly
analyzing the previously published photometric data, radial-velocity
(RV) measurements, and our new light curves, we revisit the system
parameters and orbital ephemeris for the HAT-P-33b system. Our results
are consistent with the published values except for the planet to star
radius ratio (RP/R*), the ingress/egress duration (τ) and the
total duration (T14), which together indicate a slightly shallower
and shorter transit shape. Our results are based on more complete
light curves, whereas the previously published work had only one
complete transit light curve. No significant anomalies in Transit
Timing Variations (TTVs) are found, and we place upper mass limits on
potential perturbers, largely supplanting the loose constraints
provided by the extant RV data. The TTV limits are stronger near
mean-motion resonances, especially for the low-order
commensurabilities. We can exclude the existence of a perturber with
mass larger than 0.6, 0.3, 0.5, 0.5, and 0.3M⊕ near the 1:3,
1:2, 2:3, 3:2, and 2:1 resonances, respectively.
Description:
We have recorded a total of 10 light curves of eight different
transits events observed by two telescopes (a 60/90cm Schmidt and a
60cm telescope) at Xinglong Station operated by National Astronomical
Observatories of China (NAOC) between 2013 December and 2016 January.
Two of the transit events were observed by the two telescopes
simultaneously.
The first seven transit events were monitored by the 60/90cm Schmidt
telescope. It has a 4K*4K CCD with a ∼94'*∼94' field of view, which
gives a pixel scale of 1.38''/pixel.
The transit events that occurred on UT 2014 February 27 and UT 2014
March 6 were also simultaneously observed by the 60cm, and the last
transit in our sequence was also monitored with this telescope. The
60cm telescope is equipped with a 512*512 CCD and covers a field of
view of 17'*17', resulting in a pixel scale of 1.95''/pixel.
Objects:
-----------------------------------------------------------------------
RA (ICRS) DE Designation(s) (Period)
-----------------------------------------------------------------------
07 32 44.22 +33 50 06.1 HAT-P-33 = GSC 02461-00988 (P=3.47447472)
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 81 10 Overview of observations and data reduction
table2.dat 38 3732 Photometry of HAT-P-33
table4.dat 40 17 Mid-transit times for HAT-P-33b
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See also:
J/ApJ/785/126 : HIRES radial velocity measurements (Knutson+, 2014)
J/ApJ/742/59 : HAT-P-32 and HAT-P-33 follow-up (Hartman+, 2011)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 "Y:M:D" Date UTC date of observation
13- 20 A8 "h:m:s" Time0 Starting UTC time of observation
22- 29 A8 "h:m:s" Time1 Ending UTC time of observation
31- 37 A7 --- Tel Telescope (G1)
39 A1 --- Flt [R] Filter
41- 43 I3 --- Frames Number of frames
45- 46 I2 s Exp1 First exposure time
48- 50 I3 s Exp2 ? Second exposure time
52 I1 s Read Readout time
54- 57 F4.2 --- Airmass1 Airmass
59- 62 F4.2 --- Airmass2 Airmass
64- 67 F4.2 --- Airmass3 ? Airmass
69- 72 F4.2 --- Moon Moon illum.
74 I1 --- Comp Comp. stars
76- 77 I2 pix Aper Aperture diameter around star
79- 81 F3.1 mmag Scatter Root-mean-square (rms) of residual from our
best-fitting model
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 F14.6 d BJD Date of observation in Barycentric Julian Date
(BJD); BJDTDB time standard (1)
16- 21 F6.4 --- RFlux [0.9799/1.0103] Relative flux in Flt
23- 28 F6.4 mag Scatter [0.0016/0.0038] Root-mean-square (rms) of
residual from our best-fitting model
30- 36 A7 --- Tel Telescope used in the observation (60cm or
Schmidt) (G1)
38 A1 --- Flt [R] Filter used in the observation (R)
--------------------------------------------------------------------------------
Note (1): All the timing throughout the paper are based on BJDTDB,
calculated from Coordinated Universal Time (UTC) using the procedure
developed by Eastman et al. (2010PASP..122..935E 2010PASP..122..935E).
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- E [-557/392] Epoch (1)
6- 12 A7 --- Tel Telescope (FLWO, Schmidt, or 60cm) (G1)
14- 26 F13.5 d BJD Mid-transit time Tc (BJDTDB)
28- 32 F5.2 s e_BJD [31.2/64] Uncertainty of mid-transit time
(σTc)
34- 40 F7.2 s O-C [-192.4/211.56] The (O-C) residual
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Note (1): The first seven time points are obtained from the published light
curves (Hartman et al. 2011, Cat. J/ApJ/742/59) through separate fits, the
others are from our photometric data. The epochs (239, 241) were followed
by two telescopes simultaneously.
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Global Notes:
Note (G1): Telescope used in the observation are defined as follows:
Schmidt = 60/90cm Schmidt at the Xinglong Station of National Astronomical
Observatories of China (NAOC);
60cm = 60cm telescope at the Xinglong Station of NAOC;
FLWO = Fred Lawrence Whipple Observatory (FLWO) in Arizona. For more
information about the FLWO telescope, see Hartman et al. 2011
(Cat. J/ApJ/742/59).
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History:
From electronic version of the journal
References:
Wang et al. Paper I. 2018AJ....156..181W 2018AJ....156..181W
Wang et al. Paper III. 2018AJ....155...73W 2018AJ....155...73W
Wang et al. Paper IV. 2018PASP..130f4401W 2018PASP..130f4401W
Wang et al. Paper V. 2019AJ....157...82W 2019AJ....157...82W
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 24-Oct-2017