J/A+A/628/A115 WASP-12, CoRoT-1 and TrES-3 light curves (von Essen+, 2019)
First light of engineered diffusers at the Nordic Optical Telescope reveal
time variability of the optical eclipse depth of WASP-12b.
von Essen C., Stefansson G., Mallonn M., Pursimo T., Djupvik A.A.,
Mahadevan S., Kjeldsen H., Freudenthal J., Dreizler S.
<Astron. Astrophys. 628, A115 (2019)>
=2019A&A...628A.115V 2019A&A...628A.115V (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry
Keywords: instrumentation: photometers - methods: observational -
techniques: photometric - stars: individual: WASP-12 -
stars: individual: CoRoT-1 - stars: individual: TrES-3
Abstract:
We present the characterization of two engineered diffusers mounted on
the 2.5-meter Nordic Optical Telescope, located at Roque de Los
Muchachos, Spain. To assess the reliability and the efficiency of the
diffusers, we carried out several test observations of two photometric
standard stars, along with observations of one primary transit
observation of TrES-3b in the red (R band), one of CoRoT-1b in the
blue (B band), and three secondary eclipses of WASP-12b (V band). The
achieved photometric precision is in all cases within the
submillimagnitude level for exposures between 25 and 180 seconds.
Along with a detailed analysis of the functionality of the diffusers,
we add a new transit depth measurement in the blue (B band) to the
already observed transmission spectrum of CoRoT-1b, disfavoring a
Rayleigh slope. We also report variability of the eclipse depth of
WASP-12b in the V band. For the WASP-12b secondary eclipses, we
observe a secondary depth deviation of about 5 sigma, and a difference
of 6 sigma and 2.5 sigma when compared to the values reported by other
authors in a similar wavelength range determined from Hubble Space
Telescope data. We further speculate about the potential physical
processes or causes responsible for this observed variability.
Description:
5 differential photometry time series of primary transit events (first
two) and secondary transit events (last three) of three different
extrasolar planets.
Objects:
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RA (2000) DE Designation(s)
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06 30 32.80 +29 40 20.3 WASP-12 = TYC 1891-1178-1
06 48 19.17 -03 06 07.7 CoRoT-1 = DENIS J064819.1-030607
17 52 07.02 +37 32 46.2 TrES-3 = TrES-3
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lcs.dat 115 1111 Engineered diffuser photometry
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See also:
J/A+A/628/A116 : HAT-P-26 differential transit photometry (von Essen+, 2019)
Byte-by-byte Description of file: lcs.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Target of interest (WASP-12, CoRoT-1 or TrES-3)
11- 16 A6 --- Tel [NOT ] Telescope
17 A1 --- Filter [BVR] Photometric filter (1)
21- 40 F20.12 d BJD Barycentric Julian Date (TDB)
42- 65 E24.19 --- FluxRaw Raw and normalized flux
67- 90 E24.19 --- e_FluxRaw Uncertainty of raw and normalized flux
92-115 E24.19 --- Fluxdet Detrended and normalized flux
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Note (1): B for CoRoT-1; R for TrES-3; V for WASP-12.
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Acknowledgements:
Carolina von Essen, cessen(at)phys.au.dk
(End) Patricia Vannier [CDS] 12-Aug-2019