J/MNRAS/527/4936 WASP-127 b LCs, WASP-96 b transmission spectra (Hayes+, 2024)
TransitFit: combined multi-instrument exoplanet transit fitting for JWST,
HST and ground-based transmission spectroscopy studies.
Hayes J.J.C., Priyadarshi A., Kerins E., Awiphan S., McDonald I.,
A-thano N., Morgan J.S., Humpage A., Charles S., Wright M., Joshi Y.C.,
Jiang I.-G., Inyanya T., Padjaroen T., Munsaket P., Chuanraksasat P.,
Komonjinda S., Kittara P., Dhillon V.S., Marsh T.R., Reichart D.E.,
Poshyachinda S. (The SPEARNET Collaboration)
<Mon. Not. R. Astron. Soc. 527, 4936-4954 (2024)>
=2024MNRAS.527.4936H 2024MNRAS.527.4936H (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry ; Optical ;
Spectra, infrared
Keywords: methods: analytical - methods: data analysis -
software: data analysis - software: public release -
planets and satellites: atmospheres
Abstract:
We present TransitFit, a package designed to fit exoplanetary transit
light-curves. TransitFit offers multi-epoch, multi-wavelength fitting
of multi-telescope transit data. TransitFit allows per-telescope
detrending to be performed simultaneously with transit parameter
fitting, including custom detrending. Host limb darkening can be
fitted using prior conditioning from stellar atmosphere models. We
demonstrate TransitFit in a number of contexts. We model
multi-telescope broadband optical data from the ground-based SPEARNET
survey of the low-density hot-Neptune WASP-127b and compare results to
a previously published higher spectral resolution GTC/OSIRIS
transmission spectrum. Using TransitFit, we fit 26 transit epochs by
TESS to recover improved ephemeris of the hot-Jupiter WASP-91b and a
transit depth determined to a precision of 111ppm. We use TransitFit
to conduct an investigation into the contested presence of TTV
signatures in WASP-126b using 180 transits observed by TESS,
concluding that there is no statistically significant evidence for
such signatures from observations spanning 27 TESS sectors. We fit HST
observations of WASP-43b, demonstrating how TransitFit can use custom
detrending algorithms to remove complex baseline systematics. Lastly,
we present a transmission spectrum of the atmosphere of WASP-96b
constructed from simultaneous fitting of JWST NIRISS Early Release
Observations and archive HST WFC3 transit data. The transmission
spectrum shows generally good correspondence between spectral features
present in both datasets, despite very different detrending
requirements.
Description:
We tabulate the SPEARNET observations of WASP-127 b transit
lightcurves and transmission spectrum of WASP-96 b generated from
TransitFit fitting of JWST NIRISS and HST WFC3 transit lightcurves.
Objects:
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RA (2000) DE Designation(s)
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10 42 14.08 -03 50 06.3 WASP-127 b = TOI-675b
00 04 11.13 -47 21 38.3 WASP-96 b = TOI-247b
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tnti.dat 66 29062 WASP-127 b raw lightcurves from TNT in i' band
(2017/02/15)
trtgaor.dat 69 1236 WASP-127 b raw lightcurves from TRTGAO in R band
(2017/02/15)
promptr.dat 70 402 WASP-127 b raw lightcurves from PROMPT8 in R band
(2017/03/21)
tntr.dat 66 68769 WASP-127 b raw lightcurves from TNT in r' band
(2018/02/26)
tnt1u.dat 66 736 WASP-127 b raw lightcurves from TNT in u' band
(2019/03/09)
tnt2u.dat 66 1527 WASP-127 b raw lightcurves from TNT in u' band
(2019/03/30)
tshst.dat 113 38 WASP-96 b transmission spectrum from TransitFit
fitting of HST WFC3 data
tsjwst.dat 113 88 WASP-96 b transmission spectrum from TransitFit
fitting of JWST NIRISS data
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See also:
J/A+A/616/A145 : GTC transit light curves of WASP-127b (Chen+, 2018)
Byte-by-byte Description of file: tnt*.dat trtgaor.dat promptr.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 F18.10 d Time Time, TDB (BJD)
20- 37 F18.16 --- Flux Normalised flux
39- 59 F21.19 --- e_Flux Normalised flux error
61- 62 A2 -- Band Observed band
64- 70 A7 --- Inst Instrument
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Byte-by-byte Description of file: tshst.dat tsjwst.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 F18.13 nm lambda Wavelength
20- 37 F18.15 nm e_lambda Lower-error on wavelength
39- 56 F18.15 nm E_lambda Upper-error on wavelength
58- 75 F18.12 ppm Depth Transit depth
77- 94 F18.14 ppm e_Depth Lower-error on transit depth
96-113 F18.14 ppm E_Depth Upper-error on transit depth
--------------------------------------------------------------------------------
Acknowledgements:
A. Priyadarshi, akshay.priyadarshi(at)postgrad.manchester.ac.uk
(End) Patricia Vannier [CDS] 22-Mar-2021