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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 (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: -------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------- 16 37 15.57 +07 11 00.1 WASP-103b = WASP-103b -------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file lcs.dat 81 11220 Spectro-photometry lcswhite.dat 65 165 White light photometry
See also: J/MNRAS/447/711 : Transiting planet WASP-103 (Southworth+, 2015) Byte-by-byte Description of file: lcs.dat
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 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
Byte-by-byte Description of file: lcswhite.dat
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
Acknowledgements: Monika Lendl, monika.lendl(at)oeaw.ac.at
(End) Patricia Vannier [CDS] 05-Sep-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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