J/AJ/163/175 WASP-12 individual transit fit with TESS (Wong+, 2022)
TESS Revisits WASP-12; Updated Orbital Decay Rate and Constraints on Atmospheric
Variability.
Wong I., Shporer A., Vissapragada S., Greklek-McKeon M., Knutson H.A.,
Winn J.N., Benneke B.
<Astron. J., 163, 175 (2022)>
=2022AJ....163..175W 2022AJ....163..175W
ADC_Keywords: Stars, double and multiple; Exoplanets; Photometry, K-line
Keywords: Hot Jupiters ; Exoplanet astronomy ; Transit photometry
Abstract:
After observing WASP-12 in the second year of the primary mission, the
Transiting Exoplanet Survey Satellite (TESS) revisited the system in
late 2021 during its extended mission. In this paper, we incorporate
the new TESS photometry into a reanalysis of the transits, secondary
eclipses, and phase curve. We also present a new Ks-band occultation
observation of WASP-12b obtained with the Palomar/Wide-field Infrared
Camera instrument. The latest TESS photometry spans three consecutive
months, quadrupling the total length of the TESS WASP-12 light curve
and extending the overall time baseline by almost two years. Based on
the full set of available transit and occultation timings, we find
that the orbital period is shrinking at a rate of
-29.81±0.94ms/yr. The additional data also increase the
measurement precision of the transit depth, orbital parameters, and
phase-curve amplitudes. We obtain a secondary eclipse depth of
466±35ppm, a 2σ upper limit on the nightside brightness of
70 ppm, and a marginal 6.2±2.8deg eastward offset between the
dayside hotspot and the substellar point. The voluminous TESS data set
allows us to assess the level of atmospheric variability on timescales
of days, months, and years. We do not detect any statistically
significant modulations in the secondary eclipse depth or day-night
brightness contrast. Likewise, our measured Ks-band occultation depth
of 2810±390ppm is consistent with most ∼2.2µm observations in
the literature.
Objects:
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RA (2000) DE Designation(s)
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06 30 32.80 +29 40 20.3 WASP-12 = WASP-12
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 62 74 Results of individual transit fits
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See also:
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
J/ApJ/720/872 : A spectropolarimetric analysis of WASP-12 (Fossati+, 2010)
J/ApJ/727/125 : Two secondary eclipses of WASP-12b with Spitzer (Campo+, 2011)
J/AJ/141/179 : Transits of TrES-4b, HAT-P-3b and WASP-12b (Chan+, 2011)
J/A+A/551/A108 : Multi-site obs. of WASP-12 b transit (Maciejewski+, 2013)
J/A+A/588/L6 : WASP-12 transit light curves (Maciejewski+ 2016)
J/A+A/600/A30 : Limb-darkening for TESS satellite (Claret, 2017)
J/AJ/154/4 : Times of transits and occultations of WASP-12b (Patra+, 2017)
J/AcA/68/371 : WASP and KELT planet transits (Maciejewski+, 2018)
J/AJ/155/165 : Dissipation exoplanet hosts from tidal spin-up (Penev+, 2018)
J/AJ/158/190 : Main seq. hot Jupiter host with good astrometry (Hamer+, 2019)
J/A+A/628/A115 : WASP-12, CoRoT-1 and TrES-3 light curves (von Essen+, 2019)
J/AcA/70/1 : WASP-18 Photometric timeseries & timedata (Maciejewski+, 2020)
J/AJ/159/150 : Transit times of 11 hot Jupiters (Patra+, 2020)
J/AJ/160/155 : Light curve segments of 22 host stars with TESS (Wong+, 2020)
J/ApJ/888/L5 : Transits, occultation times and RVs of WASP-12b (Yee+, 2020)
J/AJ/161/72 : 180 Transit and occultation times for WASP-12b (Turner+, 2021)
J/AJ/162/127 : Lightcurve from 2nd year TESS primary mission (Wong+, 2021)
J/A+A/657/A52 : CHEOPS transit light curves of WASP-103 b (Barros+, 2022)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Transit number
8- 20 F13.5 d BJD [2458844/2459551] Mid-transit time, BJDTDB
22- 28 F7.5 d e_BJD The 1-sigma uncertainty in BJD
30- 35 F6.4 --- RpRs [0.11/0.12] Planet-star radius ratio
37- 42 F6.4 --- e_RpRs [0.001/0.004] The 1-sigma uncertainty in RpRs
44- 47 F4.2 --- b [0.12/0.52] Impact parameter
49- 52 F4.2 --- e_b [0.12/0.29] The 1-sigma uncertainty in b
54- 57 F4.2 --- aRs [2.75/3.24] Scaled orbital semimajor axis
59- 62 F4.2 --- e_aRs [0.06/0.29] The 1-sigma uncertainty in aRs
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 29-Apr-2022