J/MNRAS/509/1447 Light curves of KELT-16 (Mancini+, 2022)
The ultra-hot-Jupiter KELT-16 b: dynamical evolution and atmospheric properties.
Mancini L., Southworth J., Naponiello L., Basturk O., Barbato D.,
Biagiotti F., Bruni I., Cabona L., D'ago G., Damasso M., Erdem A.,
Evans D., Henning T., Ozturk O., Ricci D., Sozzetti A., Tregloan-Reed J.,
Yalcinkaya S.
<Mon. Not. R. Astron. Soc., 509, 1447-1464 (2022)>
=2022MNRAS.509.1447M 2022MNRAS.509.1447M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry
Keywords: methods: data analysis - techniques: photometric -
stars: fundamental parameters - stars: individual: KELT-16 -
planetary systems
Abstract:
We present broad-band photometry of 30 planetary transits of the
ultra-hot-Jupiter KELT-16 b, using five medium-class telescopes. The
transits were monitored through standard B, V, R, I filters and four
were simultaneously observed from different places, for a total of 36
new light curves. We used these new photometric data and those from
the TESS space telescope to review the main physical properties of the
KELT-16 planetary system. Our results agree with previous measurements
but are more precise. We estimated the mid-transit times for each of
these transits and combined them with others from the literature to
obtain 69 epochs, with a time baseline extending over more than 4yr,
and searched for transit time variations. We found no evidence for a
period change, suggesting a lower limit for orbital decay at 8Myr,
with a lower limit on the reduced tidal quality factor of
Q'*>(1.9±0.8)x105 with 95 per cent confidence. We built up an
observational, low-resolution transmission spectrum of the planet,
finding evidence of the presence of optical absorbers, although with a
low significance. Using TESS data, we reconstructed the phase curve
finding that KELT-16 b has a phase offset of 25.25±14.03°E, a
day- and night-side brightness temperature of 3190±61K and
2668±56K, respectively. Finally, we compared the flux ratio of the
planet over its star at the TESS and Spitzer wavelengths with
theoretical emission spectra, finding evidence of a temperature
inversion in the planet's atmosphere, the chemical composition of
which is preferably oxygen-rich rather than carbon-rich.
Description:
Light curves of KELT-16 obtained with five medium-class telescopes.
TESS light curves.
Light curves of 34 transit events of the extrasolar planet KELT-16b.
Fourteen of the datasets were obtained using the CA 1.23-m telescope
(filter: B, V, R I) at the Observatory of Calar Alto, Spain, eleven
with the Cassini 1.52-m telescope (filter: B, V, R, GG-495) at the
Astrophysics and Space Science Observatory of Bologna in Loiano,
Italy, eight with the T100 1-m Turkish telescope (filter: R, I) at the
Tunitak National Observatory (Turkey), two with the 84-cm telescope of
the Observatorio Astronomico Nacional of San Pedro Martir, Mexico
(filter: R), one with the OARPAF 80-cm telescope, located at the Mt.
Antola in Northern Italy.
Objects:
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RA (2000) DE Designation(s)
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20 57 04.44 +31 39 39.6 KELT-16 = TIC 236445129
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 123 36 Details of the transit observations presented
in this work
lc/* . 36 Individual light curves
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Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 A13 --- Tel Telescope
15- 24 A10 "datime" Date Date of first observation
26- 30 A5 "h:m" TimeS Start time (UT)
32- 36 A5 "h:m" TimeE End time (UT)
38- 40 I3 --- Nobs Number of observations
42- 44 I3 s Texp1 Exposure time
45 A1 --- --- [/]
46- 48 I3 s Texp2 ? Exposure time
50- 52 I3 s Tobs1 Observation cadence
53 A1 --- --- [/]
54- 56 I3 s Tobs2 ? Observation cadence
58- 66 A9 --- Filter Filter
68- 85 A18 --- Airmass
87- 88 I2 % Moon Geocentric fractional illumination of the
Moon at midnight (ut)
90- 91 I2 pix Rap1 Aperture radius (1)
92 A1 --- --- [,]
93- 94 I2 pix Rap2 Aperture radius (1)
95 A1 --- --- [,]
96- 97 I2 pix Rap3 Aperture radius (1)
99-102 F4.2 mmag Scatter rms scatter of the data versus a fitted model
104-106 A3 --- Sim [yes/no ] Specifies if the transit was
simultaneously observed by more than one
telescope
108-123 A16 --- FileName Name of the ligth curve file in
subdirectory lc
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Note (1): The aperture sizes are the radii of the software apertures for the
star, inner sky, and outer sky, respectively.
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Byte-by-byte Description of file: lc/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.7 d BJD Barycentric JD for the midpoint of
observation (TDB)
16- 25 F10.7 mag mag Differential magnitude of the target
29- 37 F9.7 mag e_mag Measurement error of the magnitude
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Acknowledgements:
Luigi Mancini, mancini(at)roma2.infnf.it,
University of Rome "Tor Vergata", Italy
(End) Luigi Mancini [Rome Univ., Italy], Patricia Vannier [CDS] 24-Jan-2022