J/A+A/635/A205    Ultra-hot Jupiter WASP-121b transits         (Bourrier+, 2020)

Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS). III. Atmospheric structure of the misaligned ultra-hot Jupiter WASP-121b. Bourrier V., Ehrenreich D., Lendl M., Cretignier M., Allart R., Dumusque X., Cegla H.M, Suarez-Mascareno A., Wyttenbach A., Hoeijmakers H.J., Melo C., Kuntzer T., Astudillo-Defru N., Giles H., Heng K., Kitzmann D., Lavie B., Lovis C., Murgas F., Nascimbeni V., Pepe F., Pino L., Segransan D., Udry S. <Astron. Astrophys. 635, A205 (2020)> =2020A&A...635A.205B 2020A&A...635A.205B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry Keywords: planets and satellites: atmospheres - planets and satellites: fundamental parameters - instrumentation: spectrographs - planets and satellites: individual: WASP-121b - methods: observational - techniques: spectroscopic Abstract: Ultra-hot Jupiters offer interesting prospects for expanding our theories on dynamical evolution and the properties of extremely irradiated atmospheres. In this context, we present the analysis of new optical spectroscopy for the transiting ultra-hot Jupiter WASP-121b. We first refine the orbital properties of WASP-121b, which is on a nearly polar (obliquity PsiNorth=88.1±0.25° or PsiSouth=91.11±0.20°) orbit, and exclude a high differential rotation for its fast-rotating (P<1.13-days), highly inclined (i*North=8.1+3.0-2.6° or i*South=171.9+2.5-3.4°) star. We then present a new method that exploits the reloaded Rossiter-McLaughlin technique to separate the contribution of the planetary atmosphere and of the spectrum of the stellar surface along the transit chord. Its application to HARPS transit spectroscopy of WASP-121b reveals the absorption signature from metals, likely atomic iron, in the planet atmospheric limb. The width of the signal (14.3±1.2km/s) can be explained by the rotation of the tidally locked planet. Its blueshift (-5.2±0.5km/s) could trace strong winds from the dayside to the nightside, or the anisotropic expansion of the planetary thermosphere. Description: Mask containing the spectral position and weights of 1828 absorption lines in the spectrum of the star WASP-121, within the spectral range of the HARPS spectrograph. Lines position are defined in the air in the stellar rest frame. Weights are set by the depth of the stellar lines. Photometry of WASP-121 with EulerCam at the 1.2m Euler telescope at La Silla, obtained during four independent transits of the ultra-hot Jupiter WASP-121b. The names of the files gives the date of the observation (year/month/day). Objects: ------------------------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------------------------- 07 10 24.06 -39 05 50.6 WASP-121 = 1SWASP J071024.05-390550.5 ------------------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file 20140119.dat 77 235 EulerCam photometry of WASP-121 during transit on 19 Jan. 2014 20140123.dat 77 195 EulerCam photometry of WASP-121 during transit on 23 Jan. 2014 20171231.dat 77 248 EulerCam photometry of WASP-121 during transit on 31 Dec. 2017 20180114.dat 77 307 EulerCam photometry of WASP-121 during transit on 14 Jan. 2018 ccf-mask.dat 32 1828 Custom CCF mask of WASP-121 -------------------------------------------------------------------------------- See also: J/A+A/623/A57 : WASP-121 b Swift UVOT near-UV transit observations (Salz+ 2019) Byte-by-byte Description of file: 201?????.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 11 F11.6 d HJD Heliocentric Julian Date (HJD-2450000) 15- 22 F8.6 --- Phot Normalized raw photometry 26- 33 F8.6 --- e_Phot Error on normalized raw photometry 37- 44 F8.6 --- Fit Complete model fitted to the normalized raw photometry 48- 55 F8.6 --- Base Parametric baseline component of the photometry model 59- 66 F8.6 --- Comp Transit component of the photometry model 70- 77 F8.6 --- Photc Normalized photometry corrected for the baseline component -------------------------------------------------------------------------------- Byte-by-byte Description of file: ccf-mask.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 11 F11.6 0.1nm Left Left wavelength boundary of the mask lines 13- 23 F11.6 0.1nm Right Right wavelength boundary of the mask lines 25- 32 F8.6 --- Weight Weight of the mask lines -------------------------------------------------------------------------------- Acknowledgements: Vincent Bourrier, vincent.bourrier(at)unige.ch Department of astronomy, University of Geneva, Switzerland
(End) Vincent Bourrier [Univ. Geneva], Patricia Vannier [CDS] 10-Jan-2020
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