J/AcA/71/223 HAT-P-36 T80, T100 light curves and O-C (Yalcinkaya+, 2021)
Analysis of the most precise light curves of HAT-P-36 detrended from spot
signals.
Yalcinkaya S., Basturk O., El Helweh F., Esmer E.M., Yorukoglu O.,
Yilmaz M., Senavci H., Kilicoglu T., Selam S.O.
<Acta Astron. 71, 223-242 (2021)>
=2021AcA....71..223Y 2021AcA....71..223Y (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry
Keywords: stars: individual: HAT-P-36 - planets: individual: HAT-P-36 b -
planetary systems -
methods: observational - techniques: photometric
Abstract:
We study the most precise light curves of the planet-host HAT-P-36
that we obtained from the ground primarily with a brand-new 80cm
telescope (T80) very recently installed at Ankara University Kreiken
Observatory (AUKR) of Turkey and also from the space with Transiting
Exoplanet Survey Satellite (TESS). The main objective of the study is
to analyze the Transit Timing Variations (TTV) observed in the
hot-Jupiter type planet HAT-P-36 b, a strong candidate for orbital
decay, based on our own observations as well as that have been
acquired by professional and amateur observers since its discovery
(Bakos et al., 2012AJ....144...19B 2012AJ....144...19B, Cat. J/AJ/144/19). HAT-P-36
displays out-of-transit variability as well as light curve anomalies
during the transits of its planet due to stellar spots. We collected
and detrended all the complete transit light curves we had access to
from these anomalies, which we modeled with EXOFAST (Eastman et al.,
2013PASP..125...83E 2013PASP..125...83E) and measured the mid-transit times forming a
homogeneous data set for a TTV analysis. We found an increase in the
orbital period of HAT-P-36 b at a rate of 0.014 seconds per year from
the best fitting quadratic function, which is only found in the TTV
constructed by making use of the mid-transit times measured from
detrended light curves, against an expectation of an orbital decay
based on its parameters. We refined the values of these system
parameters by modelling the Spectral Energy Distribution of the host
star, its archival radial velocity observations from multiple
instruments, and most precise transit light curves from the space and
the ground covering a wide range of wavelengths with EXOFASTv2
(Eastman, 2017, ascl, 1710, 003). We also analyzed the out-of-transit
variability from TESS observations to search for potential rotational
modulations through a frequency analysis. We report a statistically
significant periodicity in the TESS light curve at 4.22±0.02 days,
which might have been caused by instrumental systematics but should be
tracked in the future observations of the target.
Description:
Mid transit times and their errors, Epoch, TTV and quality parameters
from detrended and undetrended data from exoplanet transit database,
literature and our observations of HAT-P-36 are presented. Our
detrended light curves also provided. Please sent an email to
yalcinkayas at ankara.edu.tr for raw light curves from T80 of AUKR and
T100 of TUG telescopes.
Objects:
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RA (2000) DE Designation(s)
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12 33 03.91 +44 54 55.2 HAT-P-36 = TYC 3020-2221-1
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
detren.dat 139 95 HAT-P-36 detrended mid transit times
undetren.dat 138 95 HAT-P-36 undetrended mid transit times
lc.dat 44 1112 HAT-P-36 detrended light curves
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See also:
J/AJ/144/19 : Follow-up photometry for HAT-P-34 through HAT-P-37 (Bakos+, 2012)
Byte-by-byte Description of file: detren.dat undetren.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 F14.6 d Time Mid-transit time in BJD-TDB
16- 28 F13.11 d e_Time Mid-transit time error
30- 34 I5 --- Epoch Cycle number
36- 56 E21.17 d TTV Observed minus calculated mid-transit times
58- 63 A6 --- Filt Passband of Observations (1)
65- 89 A25 --- Source Source of light curve
91-107 F17.15 --- beta Red noise scale
109-125 F17.15 --- PNR Photon noise rate per instrument
in parts per thousand
127-139 F13.11 --- rms root mean square of residuals from
individual EXOFAST model
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Note (1): Filters are TESS, V, R, I, gunnr, sloani, sloanr, clear and Clear.
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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- 14 F14.6 d Time Mid exposure time in BJD (TDB)
16- 23 F8.6 --- Flux Normalized flux
25- 32 F8.6 --- e_Flux Normalized flux error
34- 37 A4 --- Tel T80 observations from AUKR and T100
observations from TUG
39- 44 A6 --- Filt [R sloanr] Passband of observation
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Acknowledgements:
If you need undetrended light curves, please e-mail:
Selcuk Yalcinkaya, yalcinkayas(at)ankara.edu.tr
(End) Patricia Vannier [CDS] 06-Dec-2021