J/A+A/642/A50 WASP-74 grizs light curves (Luque+, 2020)
Obliquity measurement and atmospheric characterization of the
WASP-74 planetary system.
Luque R., Casasayas-Barris N., Parviainen H., Chen G., Palle E.,
Livingston J., Bejar V.J.S., Crouzet N., Esparza-Borges E., Fukui A.,
Hidalgo D., Kawashima Y., Kawauchi K., Klagyivik P., Kurita S., Kusakabe N.,
de Leon J.P., Madrigal-Aguado A., Montanes-Rodriguez P., Mori M., Murgas F.,
Narita N., Nishiumi T., Nowak G., Oshagh M., Sanchez-Benavente M.,
Stangret M., Tamura M., Terada Y., Watanabe N.
<Astron. Astrophys. 642, A50 (2020)>
=2020A&A...642A..50L 2020A&A...642A..50L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry ; Optical
Keywords: planetary systems - planets and satellites: individual: WASP-74 b -
planets and satellites: atmospheres - methods: observational -
techniques: photometric - techniques: radial velocities -
Abstract:
We present new transit observations of the hot Jupiter WASP-74 b
(Teq∼1860K) using the high-resolution spectrograph HARPS-N and the
multi-colour simultaneous imager MuSCAT2. We refined the orbital
properties of the planet and its host star and measured its obliquity
for the first time. The measured sky-projected angle between the
stellar spin-axis and the orbital axis of the planet is compatible
with an orbit that is well-aligned with the equator of the host star
(λ=0.77±0.99°). We are not able to detect any absorption
feature of Hα or any other atomic spectral features in the
high-resolution transmission spectra of this source owing to low S/N
at the line cores. Despite previous claims regarding the presence of
strong optical absorbers such as TiO and VO gases in the atmosphere of
WASP-74 b, new ground-based photometry combined with a reanalysis of
previously reported observations from the literature show a slope in
the low-resolution transmission spectrum that is steeper than expected
from Rayleigh scattering alone.
Description:
The data consists of relative photometry time series with a set of
simultaneously measured covariates. The observations were carried out
with the MuSCAT2 instrument and cover four transits of WASP-74b in 4
or 3 simultaneously measured passbands. The photometry has been
detrended using a linear model based on the attached covariates.
Objects:
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RA (2000) DE Designation(s)
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20 18 09.32 -01 04 32.6 WASP-74b = BD-01 3943b
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 81 15 List of light curves
lc/* . 15 Individual light curves
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See also:
J/MNRAS/485/5168 : Light curves of WASP-74 (Mancini+, 2019)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Obs.date Observation date
12- 15 A4 --- Band [gri zs] Observed band
17- 20 I4 --- Nobs Number of observation
22- 33 A12 --- FileName Name of the table, in subdirectory lc
35- 81 A47 --- Title Title of the table
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Byte-by-byte Description of file: lc/*
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Bytes Format Units Label Explanations
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1- 18 F18.10 d Time Time (JD)
20- 37 F18.16 --- Flux Normalized flux
39- 43 F5.3 --- Airmass Airmss
45- 67 F23.20 pix Xshift X-centroid shift
69- 91 E23.20 pix Yshift Y-centroid shift
93-115 E23.20 --- Entropy Aperture entropy
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Acknowledgements:
Hannu Parviainen, hannu(at)iac.es
(End) Patricia Vannier [CDS] 24-Aug-2020