J/AJ/161/269 HST WFC3/UVIS normalized light curve of WASP-43 (Fraine+, 2021)
The Dark World: a tale of WASP-43b in reflected light with HST WFC3/UVIS.
Fraine J., Mayorga L.C., Stevenson K.B., Lewis N.K., Kataria T., Bean J.L.,
Bruno G., Fortney J.J., Kreidberg L., Morley C.V., Mouawad N.C.,
Todorov K.O., Parmentier V., Wakeford H., Feng Y.K., Kilpatrick B.M.,
Line M.R.
<Astron. J., 161, 269 (2021)>
=2021AJ....161..269F 2021AJ....161..269F
ADC_Keywords: Exoplanets; Stars, high-velocity; Photometry, HST
Keywords: Exoplanet atmospheric composition ; Exoplanet atmospheres ;
Exoplanet astronomy ; Exoplanets ; Atmospheric composition ;
Atmospheric science ; Planetary atmospheres
Abstract:
Optical reflected light eclipse observations provide a direct probe of
exoplanet scattering properties, such as from aerosols. We present
here the photometric reflected light observations of WASP-43b using
the Hubble Space Telescope (HST) WFC3/UVIS instrument with the F350LP
filter (346-822nm) encompassing the entire optical band. This is the
first reflected light photometric eclipse using UVIS in scanning mode;
as such, we further detail our scanning extraction and analysis
pipeline Arctor. Our HST WFC3/UVIS eclipse light curve for WASP-43b
derived a 3σ upper limit of 67ppm on the eclipse depth, which
implies that WASP-43b has a very dark dayside atmosphere. With our
atmospheric modeling campaign, we compared our reflected light
constraints with predictions from global circulation and cloud models
benchmarked with HST and Spitzer observations of WASP-43b. We infer
that we do not detect clouds on the dayside within the pressure levels
probed by HST WFC3/UVIS with the F350LP filter (P>1bar). This is
consistent with the general circulation model predictions based on
previous WASP-43b observations. Dayside emission spectroscopy results
from WASP-43b with HST and Spitzer observations are likely to not be
significantly affected by contributions from cloud particles.
Description:
We photometrically observed the hot Jupiter system WASP-43 during an
eclipse event of the planet, which encompassed four Hubble Space
Telescope (HST) orbits.
Because WASP-43, the host star, is moderately bright (Vmag=12.4) in
our chosen filter (F350LP filter; 346-822nm), we observed it using the
HST Wild Field Camera 3 (WFC3)/UVIS spatial scan mode with a scan rate
of 0.2278"/s; the maximum scanning rate is 1"/s, limited by flight
software.
Objects:
---------------------------------------------
RA (ICRS) DE Designation(s)
---------------------------------------------
10 19 38.01 -09 48 22.6 WASP-43 = WASP-43
---------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig4.dat 142 75 HST WFC3/UVIS normalized flux light curve
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See also:
J/A+A/563/A40 : WASP-43b g'r'i'z'JHK light curves (Chen+, 2014)
J/PASP/127/143 : WASP-39b and WASP-43b light curves (Ricci+, 2015)
J/A+A/594/A65 : GTC transit light curves of HAT-P-32b (Nortmann+, 2016)
J/AJ/151/17 : Eight transiting light curves of WASP-43b (Jiang+, 2016)
J/A+A/600/L11 : GTC transit light curves of WASP-52b (Chen+, 2017)
J/A+A/616/A145 : GTC transit light curves of WASP-127b (Chen+, 2018)
J/A+A/615/A79 : KOINet. Study of exoplanet systems via TTVs (von Essen+, 2018)
J/A+A/630/A89 : WASP-12b and WASP-43b griz light curves (Parviainen+, 2019)
J/A+A/631/A169 : HAT-P-1b transit light curves (Todorov+, 2019)
J/AJ/159/204 : HAT-P-41b transm. spectra with HST WFC3/UVIS (Wakeford+, 2020)
J/A+A/648/A15 : beta Pictoris photometry (Kenworthy+, 2021)
Byte-by-byte Description of file: fig4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Index [0/74] Observation Frame index
4- 8 A5 --- Fscan Forward Scan (Boolean); True or False
10- 14 A5 --- Rscan Reverse Scan (Boolean); True or False
16- 37 F22.20 ppm e_phot [0.0001/0.0002] Uncertainty in photometry [ppm]
39- 56 F18.16 ppm phot [0.99/1.01] Normalized HST WFC3/UVIS photometry
(photraw/median(photsraw)
58- 80 A23 --- phot0 Residuals: Photometry minus Systematics
82- 99 F18.16 --- psys [0.99/1.01] Systematics
101-118 F18.12 d MJD [58667/58668] Modified Julian Date of
observation (midpoint), JD-2400000.5
120-142 F23.20 d dMJD [-0.16/0.08] Diff MJD Array
(Interpolated MJD[1:]-MJD[:-1])
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 06-Jul-2021