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:
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RA (2000) DE Designation(s)
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07 10 24.06 -39 05 50.6 WASP-121 = 1SWASP J071024.05-390550.5
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File Summary:
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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
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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
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: ccf-mask.dat
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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