J/A+A/553/A44 Transiting extrasolar planet WASP-33b (Kovacs+, 2013)
Comprehensive time series analysis of the transiting extrasolar planet WASP-33b.
Kovacs G., Kovacs T., Hartman J.D., Bakos G.A., Bieryla A., Latham D.,
Noyes R.W., Regaly Zs., Esquerdo G.A.
<Astron. Astrophys. 553, A44 (2013)>
=2013A&A...553A..44K 2013A&A...553A..44K
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry
Keywords: planets and satellites: individual: WASP-33 -
stars: variables: delta Scuti - methods: data analysis
Abstract:
HD 15082 (WASP-33) is the hottest and fastest rotating star known to
harbor a transiting extrasolar planet (WASP-33b) The lack of high
precision radial velocity (RV) data stresses the need for precise
light curve analysis and gathering further RV data. By using available
photometric and RV data, we perform a blend analysis, compute more
accurate system parameters, confine the planetary mass and attempt to
cast light on the observed transit anomalies. We combine the original
HATNet observations and various followup data to jointly analyze the
signal content and extract the transit component and use our RV data
to aid the global parameter determination. The blend analysis of the
combination of multicolor light curves yields the first independent
confirmation of the planetary nature of WASP-33b. We clearly identify
three frequency components in the 15-21c/d regime with amplitudes
5-7mmag. These frequencies correspond to the delta Scuti-type
pulsation of the host star. None of these pulsation frequencies or
their low-order linear combinations are in close resonance with the
orbital frequency. We show that these pulsation components explain
some but not all of the observed transit anomalies. The grand-averaged
transit light curve shows that there is a ∼1.5mmag brightening
shortly after the planet passes the mid-transit phase. Although the
duration and amplitude of this brightening varies, it is visible even
through the direct inspections of the individual transit events (some
40-60% of the followup light curves show this phenomenon). We suggest
that the most likely explanation of this feature is the presence of a
well-populated spot belt which is highly inclined to the orbital
plane. This geometry is consistent with the inference from the
spectroscopic anomalies. Finally, we constrain the planetary mass to
Mp=3.27±0.73MJ by using our RV data collected by the TRES
spectrograph.
Description:
Light curves (LCs) used in the time series analysis of WASP-33 are
presented.
All LCs are on magnitude scale. The material constitutes of:
(1) the TFA-filtered/reconstructed (see Kovacs, Bakos & Noyes,
2005MNRAS.356..557K 2005MNRAS.356..557K) HATNet LC in approximate Ic (Cousins) color;
(2) LCs given in Table 1: except for the FLWO data (lc02) all LCs are
corrected for linear trends, shifted to zero magnitude at the
out-of-transit level. Time is in Heliocentric Julian Date, colors
are given in Table 1.
(3) Grand-averaged LC, as shown in Fig. 10 of the paper.
Objects:
------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------
02 26 51.06 +37 33 01.7 WAPS-33 = HD 15082
------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 34 43 Photometric datasets on WASP-33
hatnet.dat 25 12149 HATNet light curve
average.dat 42 100 Average light curve
lc/* . 43 Individual light curves
--------------------------------------------------------------------------------
See also:
J/MNRAS/408/1680 : Transiting planetary system WASP-2 (Southworth+, 2010)
J/ApJ/715/421 : Relative photometry of WASP-3 (Tripathi+, 2010)
J/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009)
J/AJ/137/3826 : Two transits of the giant planet WASP-4b (Winn+, 2009)
J/A+A/530/A5 : WASP-4b thermal emission Ks-band detection (Caceres+, 2011)
J/A+A/539/A159 : WASP-4b transit griz light curves (Nikolov+, 2012)
J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)
J/A+A/501/785 : Discovery and characterization of WASP-6b (Gillon+, 2009)
J/A+A/527/A8 : Transiting planetary system WASP-7 (Southworth+, 2011)
J/A+A/517/L1 : Radial velocities of WASP-8b planet (Queloz+, 2010)
J/ApJ/692/L100 : Relative photometry of WASP-10 (Johnson+, 2009)
J/A+A/535/A7 : Transit light curves of WASP-10 b (Maciejewski+, 2011)
J/ApJ/720/872 : A spectropolarimetric analysis of WASP-12 (Fossati+, 2010)
J/A+A/528/A65 : WASP-12b transits (Maciejewski+, 2011)
J/AJ/141/179 : Transits of TrES-4b, HAT-P-3b and WASP-12b (Chan+, 2011)
J/A+A/502/391 : WASP-13b photometry and radial velocities (Skillen+, 2009)
J/ApJ/709/159 : Relative Ic photometry of WASP-17 (Anderson+, 2010)
J/ApJ/707/167 : Transiting planetary system WASP-18 (Southworth+, 2009)
J/A+A/513/L3 : WASP-19b H-band thermal emission (Anderson+, 2010)
J/A+A/519/A98 : Transit of exoplanet WASP-21b (Bouchy+, 2010)
J/A+A/534/A16 : WASP-22 & WASP-26 photometry & velocities (Anderson+, 2011)
J/A+A/531/A24 : WASP-23 photometric and radial velocity data (Triaud+, 2011)
J/A+A/520/A56 : WASP-26b RV and photometric data (Smalley+, 2010)
J/ApJ/726/L19 : Gunn r photometry of WASP-30 (Anderson+, 2011)
J/A+A/531/A60 : WASP-31b photometry and radial velocities (Anderson+, 2011)
J/A+A/526/A130 : WASP-34b photometry and radial velocities (Smalley+, 2011)
J/A+A/525/A54 : Transits of WASP-38b (Barros+, 2011)
J/A+A/531/A40 : Transits of WASP-39b (Faedi+, 2011)
J/A+A/542/A4 : WASP-43b thirty eclipses (Gillon+, 2012)
J/A+A/544/A72 : WASP-42 and WASP-49 photometry and velocities (Lendl+, 2012)
J/A+A/533/A88 : WASP-50b photometry and radial velocities (Gillon+, 2011)
J/A+A/547/A61 : WASP78 and WASP79 RV and photometric data (Smalley+, 2012)
J/A+A/526/L10 : Transits of WASP-33 (Herrero+, 2011)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I02 --- LC Light curve number
3 A1 --- n_LC [X] X for light curve not used in the analysis (1)
5- 14 A10 --- Date UT starting date of observation (2)
16- 19 I4 --- N Number of data points
22- 23 A2 --- Filt Filter used in the observation (3)
25- 34 A10 --- Source Observer or observatory name
--------------------------------------------------------------------------------
Note (1): Light curves not used in the analysis:
02 = partial transit, difficulties in trend filtering
08 = the transit is deep
09 = deep and skewed transit
21 = deep and skewed transit
23 = near infrared "J" filter is used
28 = large oscillations, earlier and narrower transit
(the difference appears to be 28 min!)
29 = large oscillations, same night observation as that of 28 but
no apparent severe shift in the transit center
31 = deep and skewed transit, is in conflict with the regular
behavior observed on the same night (see 30)
35 = deeper by >50% than the average transit
38 = deep blip after the ingress
39 = deep blip after the ingress (the same night event as 38)
Note (2): YYYY-MM-DD except for LC01, 2003-2007
Note (3): C (clear) indicates that no filter was used
--------------------------------------------------------------------------------
Byte-by-byte Description of file: hatnet.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 14 F13.7 d HJD Heliocentric Julian Date (HJD-2400000.0)
19- 25 F7.5 mag Icmag Approximate Ic (Cousins) magnitude
--------------------------------------------------------------------------------
Byte-by-byte Description of file: average.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 12 F8.5 --- Phase Phase relative to the transit center (1)
15- 22 F8.5 mag dmag Reversed differential magnitudes of the
grand-averaged/phased/binned LC with the
out-of-transit level shifted to zero
25- 32 F8.5 mag e_dmag Standard deviations of the bin averages
(i.e., of Col. dmag)
35- 42 F8.5 mag M-D Data residual after subtracting the standard
transit model (model-data)
--------------------------------------------------------------------------------
Note (1): In folding the light curves, the following ephemeris was used:
P=1.2198709, Tc=2452950.6724
--------------------------------------------------------------------------------
Byte-by-byte Description of file: lc/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 12 F11.5 d HJD Heliocentric Julian Date (HJD-2400000.0)
15- 22 F8.5 mag dmag Differential magnitudes with the out-of-transit
level shifted to zero (except for lc02)
--------------------------------------------------------------------------------
Acknowledgements:
Geza Kovacs, kovacs(at)konkoly.hu
(End) Patricia Vannier [CDS] 21-Mar-2013