J/A+A/606/A18 WASP-103b light curves (Lendl+, 2017)
Signs of strong Na and K absorption in the transmission spectrum of WASP-103b.
Lendl M., Cubillos P.E., Hagelberg J., Muller A., Juvan I., Fossati L.
<Astron. Astrophys. 606, A18 (2017)>
=2017A&A...606A..18L 2017A&A...606A..18L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry ;
Radial velocities
Keywords: planets and satellites: atmospheres -
planets and satellites: gaseous planets - methods: observational -
techniques: spectroscopic
Abstract:
Transmission spectroscopy has become a prominent tool for
characterizing the atmospheric properties of close-in transiting
planets. Recent observations have revealed a remarkable diversity in
exoplanet spectra, which show absorption signatures of Na, K and
H2O, in some cases partially or fully attenuated by atmospheric
aerosols. Aerosols (clouds and hazes) themselves have been detected in
the transmission spectra of several planets thanks to
wavelength-dependent slopes caused by the particles' scattering
properties.
We present an optical 550-960nm transmission spectrum of the
extremely irradiated hot Jupiter WASP-103b, one of the hottest
(2500K) and most massive (1.5MJ) planets yet to be studied with this
technique. WASP-103b orbits its star at a separation of less than 1.2
times the Roche limit and is predicted to be strongly tidally
distorted.
We have used Gemini/GMOS to obtain multi-object spectroscopy
throughout three transits of WASP-103b. We used relative
spectrophotometry and bin sizes between 20 and 2nm to infer the
planet's transmission spectrum.
We find that WASP-103b shows increased absorption in the cores of the
alkali (Na, K) line features. We do not confirm the presence of any
strong scattering slope as previously suggested, pointing towards a
clear atmosphere for the highly irradiated, massive exoplanet
WASP-103b. We constrain the upper boundary of any potential cloud deck
to reside at pressure levels above 0.01bar. This finding is in line
with previous studies on cloud occurrence on exoplanets which find
that clouds dominate the transmission spectra of cool, low surface
gravity planets while hot, high surface gravity planets are either
cloud-free, or possess clouds located below the altitudes probed by
transmission spectra.
Description:
We present spectro-photometric time-series obtained with GMOS during
three transits of WASP-103b.
Objects:
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RA (2000) DE Designation(s)
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16 37 15.57 +07 11 00.1 WASP-103b = WASP-103b
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lcs.dat 81 11220 Spectro-photometry
lcswhite.dat 65 165 White light photometry
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See also:
J/MNRAS/447/711 : Transiting planet WASP-103 (Southworth+, 2015)
Byte-by-byte Description of file: lcs.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d HJD Heliocentric Julian Date (HJD-2450000)
14- 21 F8.6 --- Flux Normalized flux
24- 31 F8.6 --- e_Flux Normalized flux error
35- 39 F5.2 pix yshi Pixel shift in y-direction
44- 47 F4.2 --- AM Airmass
51- 55 F5.2 pix FWHM Spectral Full-Width at Half Maximum
58- 63 F6.2 s Exp [180/240] Exposure time
66- 72 F7.2 0.1nm Cen [5591/9731.5] Spectral bin central wavelength
76- 81 F6.2 0.1nm Wid [20/200] Spectral bin width
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Byte-by-byte Description of file: lcswhite.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.6 d HJD Heliocentric Julian Date (HJD-2450000)
14- 21 F8.6 --- Flux Normalized flux
24- 31 F8.6 --- e_Flux Normalized flux error
35- 39 F5.2 pix yshi Pixel shift in y-direction
44- 47 F4.2 --- AM Airmass
51- 55 F5.2 pix FWHM Spectral Full-Width at Half Maximum
60- 65 F6.2 s Exp [180/240] Exposure time
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Acknowledgements:
Monika Lendl, monika.lendl(at)oeaw.ac.at
(End) Patricia Vannier [CDS] 05-Sep-2017