J/MNRAS/510/4857 WASP-94A light curves (Ahrer+, 2022)
LRG-BEASTS: Sodium absorption and Rayleigh scattering in the atmosphere of
WASP-94A b using NTT/EFOSC2.
Ahrer E., Wheatley P. J., Kirk J., Gandhi S., King G. W., Louden T.
<Mon. Not. R. Astron. Soc. 510, 4857-4871 (2022)>
=2022MNRAS.510.4857A 2022MNRAS.510.4857A (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Spectra, optical
Keywords: methods: observational - techniques: spectroscopic -
planets and satellites: atmospheres -
planets and satellites: individual: WASP-94Ab
Abstract:
We present an optical transmission spectrum for WASP-94A b, the first
atmospheric characterization of this highly-inflated hot Jupiter. The
planet has a reported radius of 1.72+0.06-0.05RJup, a mass of
only 0.456+0.032-0.036MJup, and an equilibrium temperature of
1508±75K. We observed the planet transit spectroscopically with the
EFOSC2 instrument on the ESO New Technology Telescope (NTT) at La
Silla, Chile: the first use of NTT/EFOSC2 for transmission
spectroscopy. We achieved an average transit-depth precision of 128ppm
for bin widths of ∼200Å. This high precision was achieved in part
by linking Gaussian Process hyperparameters across all wavelength
bins. The resulting transmission spectrum, spanning a wavelength range
of 3800-7140Å, exhibits a sodium absorption with a significance of
4.9σ, suggesting a relatively cloud-free atmosphere. The sodium
signal may be broadened, with a best-fitting width of
78+67-32Å in contrast to the instrumental resolution of
27.2±0.2Å. We also detect a steep slope in the blue end of the
transmission spectrum, indicating the presence of Rayleigh scattering
in the atmosphere of WASP-94A b. Retrieval models show evidence for
the observed slope to be super-Rayleigh and potential causes are
discussed. Finally, we find narrow absorption cores in the CaII H&K
lines of WASP-94A, suggesting the star is enshrouded in gas escaping
the hot Jupiter.
Description:
These tables contain the wavelength binned and white-light light
curves of the transit of WASP-94Ab observed with the EFOSC2 instrument
on the New Technology Telescope (NTT) on the nights of 14 August 2017.
Objects:
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RA (2000) DE Designation(s)
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20 55 07.94 -34 08 08.0 WASP-94A = CD-34 14724A
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lc.dat 1020 477 Light curves
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Byte-by-byte Description of file:lc.dat
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Bytes Format Units Label Explanations
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1- 20 F20.14 d Time Time in MJD
22- 45 E24.18 --- Flux1 Normalised flux in 220Å-wide bin
centred on 3910Å
47- 70 E24.18 --- e_Flux1 Error in flux in 220Å-wide bin
centred on 3910Å
72- 95 E24.18 --- Flux2 Normalised flux in 200Å-wide bin
centred on 4120Å
97-120 E24.18 --- e_Flux2 Error in flux in 200Å-wide bin
centred on 4120Å
122-145 E24.18 --- Flux3 Normalised flux in 200Å-wide bin
centred on 4320Å
147-170 E24.18 --- e_Flux3 Error in flux in 200Å-wide bin
centred on 4320Å
172-195 E24.18 --- Flux4 Normalised flux in 210Å-wide bin
centred on 4525Å
197-220 E24.18 --- e_Flux4 Error in flux in 210Å-wide bin
centred on 4525Å
222-245 E24.18 --- Flux5 Normalised flux in 180Å-wide bin
centred on 4720Å
247-270 E24.18 --- e_Flux5 Error in flux in 180Å-wide bin
centred on 4720Å
272-295 E24.18 --- Flux6 Normalised flux in 170Å-wide bin
centred on 4895Å
297-320 E24.18 --- e_Flux6 Error in flux in 170Å-wide bin
centred on 4895Å
322-345 E24.18 --- Flux7 Normalised flux in 220Å-wide bin
centred on 5090Å
347-370 E24.18 --- e_Flux7 Error in flux in 220Å-wide bin
centred on 5090Å
372-395 E24.18 --- Flux8 Normalised flux in 200Å-wide bin
centred on 5300Å
397-420 E24.18 --- e_Flux8 Error in flux in 200Å-wide bin
centred on 5300Å
422-445 E24.18 --- Flux9 Normalised flux in 210Å-wide bin
centred on 5505Å
447-470 E24.18 --- e_Flux9 Error in flux in 210Å-wide bin
centred on 5505Å
472-495 E24.18 --- Flux10 Normalised flux in 208Å-wide bin
centred on 5714Å
497-520 E24.18 --- e_Flux10 Error in flux in 208Å-wide bin
centred on 5714Å
522-545 E24.18 --- Flux11 Normalised flux in 50Å-wide bin
centred on 5843Å
547-570 E24.18 --- e_Flux11 Error in flux in 50Å-wide bin
centred on 5843Å
572-595 E24.18 --- Flux12 Normalised flux in 50Å-wide bin
centred on 5893Å
597-620 E24.18 --- e_Flux12 Error in flux in 50Å-wide bin
centred on 5893Å
622-645 E24.18 --- Flux13 Normalised flux in 50Å-wide bin
centred on 5943Å
647-670 E24.18 --- e_Flux13 Error in flux in 50Å-wide bin
centred on 5943Å
672-695 E24.18 --- Flux14 Normalised flux in 162Å-wide bin
centred on 6049Å
697-720 E24.18 --- e_Flux14 Error in flux in 162Å-wide bin
centred on 6049Å
722-745 E24.18 --- Flux15 Normalised flux in 210Å-wide bin
centred on 6235Å
747-770 E24.18 --- e_Flux15 Error in flux in 210Å-wide bin
centred on 6235Å
772-795 E24.18 --- Flux16 Normalised flux in 180Å-wide bin
centred on 6430Å
797-820 E24.18 --- e_Flux16 Error in flux in 180Å-wide bin
centred on 6430Å
822-845 E24.18 --- Flux17 Normalised flux in 220Å-wide bin
centred on 6630Å
847-870 E24.18 --- e_Flux17 Error in flux in 220Å-wide bin
centred on 6630Å
872-895 E24.18 --- Flux18 Normalised flux in 200Å-wide bin
centred on 6840Å
897-920 E24.18 --- e_Flux18 Error in flux in 200Å-wide bin
centred on 6840Å
922-945 E24.18 --- Flux19 Normalised flux in 200Å-wide bin
centred on 7040Å
947-970 E24.18 --- e_Flux19 Error in flux in 200Å-wide bin
centred on 7040Å
972-995 E24.18 --- FluxWL Normalised white-light flux
excluding bin 1 (4020-7140 Å)
997-1020 E24.18 --- e_FluxWL Error in white-light flux
excluding bin 1 (4020-7140 Å)
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Acknowledgements:
Eva-Maria Ahrer, eva-maria.ahrer(at)warwick.ac.uk
(End) Patricia Vannier [CDS] 22-Feb-2022