J/MNRAS/515/3212 Transiting planet HATS-18b (Southworth+, 2022)
A search for transit timing variations in the HATS-18 planetary system.
Southworth J., Barker A.J., Hinse T.C., Jongen Y., Dominik M.,
Jorgensen U.G., Longa-Pena P., Sajadian S., Snodgrass C., Tregloan-Reed J.,
Bach-moller N., Bonavita M., Bozza V., Burgdorf M.J., Figuera Jaimes R.,
Helling C., Hitchcock J.A., Hundertmark M., Khalouei E., Korhonen H.,
Mancini L., Peixinho N., Rahvar S., Rabus M., Skottfelt J., Spyratos P.
<Mon. Not. R. Astron. Soc., 515, 3212-3223 (2022)>
=2022MNRAS.515.3212S 2022MNRAS.515.3212S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry, infrared ;
Optical ; Ultraviolet
Keywords: planetary systems - stars: fundamental parameters -
stars: individual: HATS-18
Abstract:
HATS-18 b is a transiting planet with a large mass and a short orbital
period, and is one of the best candidates for the detection of orbital
decay induced by tidal effects. We present extensive photometry of
HATS-18 from which we measure 27 times of mid-transit. Two further
transit times were measured from data from the Transiting Exoplanet
Survey Satellite (TESS) and three more taken from the literature. The
transit timings were fitted with linear and quadratic ephemerides and
an upper limit on orbital decay was determined. This corresponds to a
lower limit on the modified stellar tidal quality factor of
Q*'>10(5.11±0.04). This is at the cusp of constraining the
presence of enhanced tidal dissipation due to internal gravity waves.
We also refine the measured physical properties of the HATS-18 system,
place upper limits on the masses of third bodies, and compare the
relative performance of TESS and the 1.54m Danish Telescope in
measuring transit times for this system.
Description:
Twenty-nine light curves of transits of the extrasolar planetary
system HATS-18 are presented and used to confirm the existence of
transit timing variations in the system. They were obtained using the
1.54m Danish Telescope at ESO La Silla, Chile, and the 43cm Jongen
Telescope at Deep Sky Chile. the 3.6m NTT at ESO La Silla, Chile, and
the 40-inch telescope at Sutherland, South Africa. The filters used
were Cousins I for the Danish telescopes and a Chroma UV/IR filter for
the Jongen telescope. The errorbars for each transit have been scaled
so the best-fitting model (obtained using the JKTEBOP code) has a
reduced chi-squared value of 1.0.
Objects:
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RA (2000) DE Designation(s)
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11 35 49.78 -29 09 21.8 HATS-18 = TIC 14614418 = 2MASS J11354977-2909216
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hats18da.dat 35 2101 Differential photometry of HATS-18 from the
Danish telescope
hats18jo.dat 29 750 Differential photometry of HATS-18 from the
Jongen telescope
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See also:
J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)
J/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009)
J/ApJ/707/167 : Transiting planetary system WASP-18 (Southworth+, 2009)
J/MNRAS/408/1680 : Transiting planetary system WASP-2 (Southworth+, 2010)
J/A+A/527/A8 : Transiting planetary system WASP-7 (Southworth+, 2011)
J/MNRAS/420/2580 : Four transits of HAT-P-13 (Southworth+, 2012)
J/MNRAS/422/3099 : Transits of HAT-P-5 (Southworth+, 2012)
J/MNRAS/426/1338 : Transiting planetary system WASP-17 (Southworth+, 2012)
J/MNRAS/434/1300 : Planetary systems WASP-15, WASP-16 (Southworth+, 2013)
J/MNRAS/444/776 : WASP-24, WASP-25 and WASP-26 (Southworth+, 2014)
J/MNRAS/447/711 : Transiting planetary system WASP-103 (Southworth+, 2015)
J/MNRAS/454/3094 : Transiting planetary system WASP-57 (Southworth+, 2016)
J/MNRAS/457/4205 : WASP-22, WASP-41, WASP-42 and WASP-55 (Southworth+, 2016)
J/AJ/153/191 : Transiting planetary system GJ 1132 (Southworth+, 2017)
J/MNRAS/490/4230 : Transiting planet WASP-4b (Southworth+, 2019)
Byte-by-byte Description of file: hats18da.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD Barycentric Julian Date for the midpoint of
observation (TDB)
16- 25 F10.7 mag mag Differential I-band magnitude
27- 35 F9.7 mag e_mag Measurement error of the differential magnitude
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Byte-by-byte Description of file: hats18jo.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 F14.6 d BJD Barycentric Julian Date for the midpoint of
observation (TDB)
16- 22 F7.4 mag mag Differential UV/IR-band magnitude
24- 29 F6.4 mag e_mag Measurement error of the differential magnitude
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Acknowledgements:
John Southworth, taylorsouthworth(at)gmail.com
(End) John Southworth [Keele Univ., UK], Patricia Vannier [CDS] 23-Nov-2022