J/A+A/608/A26 TrES-3b UBVIz' light curves (Mackebrandt+, 2017)
Transmission spectroscopy of the hot Jupiter TrES-3b:
Disproof of an overly large Rayleigh-like feature.
Mackebrandt F., Mallonn M., Ohlert J.M., Granzer T., Lalitha S.,
Garcia Munoz A., Gibson N.P., Lee J.W., Sozzetti A., Turner J.D., Vanko M.,
Strassmeier K.G.
<Astron. Astrophys. 608, A26 (2017)>
=2017A&A...608A..26M 2017A&A...608A..26M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry, UBVRI ;
Photometry, SDSS
Keywords: planets and satellites: atmospheres - stars: individual: TrES-3 -
methods: data analysis - techniques: spectroscopic -
techniques: photometric
Abstract:
Transit events of extrasolar planets offer the opportunity to study
the composition of their atmospheres. Previous work on transmission
spectroscopy of the close-in gas giant TrES-3 b revealed an increase
in absorption towards blue wavelengths of very large amplitude in
terms of atmospheric pressure scale heights, too large to be explained
by Rayleigh- scattering in the planetary atmosphere.
We present a follow-up study of the optical transmission spectrum of
the hot Jupiter TrES-3 b to investigate the strong increase in opacity
towards short wavelengths found by a previous study. Furthermore, we
aim to estimate the effect of stellar spots on the transmission
spectrum.
This work uses previously published long slit spectroscopy transit
data of the Gran Telescopio Canarias (GTC) and published broad band
observations as well as new observations in different bands from the
near-UV to the near-IR, for a homogeneous transit light curve
analysis. Additionally, a long-term photometric monitoring of the
TrES-3 host star was performed.
Our newly analysed GTC spectroscopic transit observations show a slope
of much lower amplitude than previous studies. We conclude from our
results the previously reported increasing signal towards short
wavelengths is not intrinsic to the TrES-3 system. Furthermore, the
broad band spectrum favours a flat spectrum. Long-term photometric
monitoring rules out a significant modification of the transmission
spectrum by unocculted star spots.
Description:
We observed transits of the hot Jupiter TrES-3b in Johnson U, B, V, I
and Sloan z'. Telescopes are named according to the paper.
We monitored the exoplanet host star TrES-3 with STELLA/WiFSIP in 2016
over the course of four months from March 7 to July 10, 2016. We
observed in two filters, Johnson B and Johnson V, in blocks of three
exposures each.
Objects:
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RA (2000) DE Designation(s)
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17 52 07.02 +37 32 46.2 TrES-3 = NAME TrES-3b
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 54 17 List of photometric observations
phot/* . 17 Individual light curve data
vamosb.dat 52 28 Light curve from STELLA in Johnson B filter
vamosv.dat 52 29 Light curve from STELLA in Johnson V filter
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See also:
J/AJ/136/267 : Six occultations of the exoplanet TrES-3 (Winn+, 2008)
J/ApJ/691/1145 : Spectrophotometry of TrES-3 and TrES-4 (Sozzetti+, 2009)
J/MNRAS/408/1494 : Planetary transits of TrES-2 and TrES-3 (Colon+, 2010)
J/AJ/145/68 : Five new transit light curves of TrES-3 (Jiang+, 2013)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Band [UBVI z'] Observed band
4- 10 A7 --- PSys [Johnson Sloan] Photometric system of the Band
12- 17 A6 --- Inst Instrument
19- 28 A10 "date" Obs.Date Observation date
30- 32 I3 s-1 Cad Cadence
34- 36 I3 --- Nobs Number of data points
38- 41 F4.2 mmag-1 rms Dispersion of the residuals as root mean
square (rms) of the observations after
subtracting a transit model
43- 54 A12 --- FileName Name of the table with photometry in
subdirectory phot
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Byte-by-byte Description of file: phot/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
3- 24 E22.17 d BJD Barycenric corrected modified Julian date
(UTC, BJD-2400000)
29- 39 E11.6 mag dmag Differential magnitude
42- 52 E11.6 mag e_dmag Error of dmag
56- 66 E11.6 pix xposT Target x position on CCD
70- 80 E11.6 pix yposT Target y position on CCD
84- 94 E11.6 --- FWHMT FWHM of target
98-108 E11.6 --- FluxT Flux of the target
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Byte-by-byte Description of file: vamos[bv].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
3- 24 E22.17 d JD Julian date in UTC (JD-2400000)
28- 39 E12.6 --- Flux Normalized flux
42- 52 E11.6 --- e_Flux Error of Flux
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Acknowledgements:
Felix Mackebrandt, mackebrandt(at)mps.mpg.de
(End) Felix Mackebrandt [MPS, Germany], Patricia Vannier [CDS] 27-Sep-2017