J/AcA/70/203 WASP-148 Ground-based Photometric Observations (Maciejewski+, 2020)
A Newtonian Model for the WASP-148 Exoplanetary System Enhanced with TESS
and Ground-based Photometric Observations.
Maciejewski G., Fernandez M., Sota A., Garcia Segura A.J.
<Acta Astron. 70, 203-217 (2020)>
=2020AcA....70..203M 2020AcA....70..203M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry, CCD
Keywords: planetary systems - stars: individual: WASP-148 -
planets and satellites: individual: WASP-148 b, WASP-148 c
Abstract:
The WASP-148 planetary system has a rare architecture with a
transiting Saturn-mass planet on a tight orbit which is accompanied by
a slightly more massive planet on a nearby outer orbit. Using new
space-born photometry and ground-based follow-up transit observations
and data available in literature, we performed modeling that accounts
for gravitational interactions between both planets. Thanks to the new
transit timing data for planet b, uncertainties of orbital periods and
eccentricities for both planets were reduced relative to previously
published values by a factor of 3-4. Variation in transit timing has
an amplitude of about 20 min and can be easily followed-up with a 1-m
class telescopes from the ground. An approximated transit ephemeris,
which accounts for gravitational interactions with an accuracy up to 5
min, is provided. No signature of transits was found for planet c down
to the Neptune-size regime. No other transiting companions were found
down to a size of about 2.4 Earth radii for interior orbits. We
notice, however, that the regime of terrestrial-size planets still
remains unexplored in that system.
Description:
We provide new light curves for two transits of the WASP-148 b
exoplanet observed on July 9 and August 22, 2020 with the 1.5m
Ritchey-Chretien Telescope at the Sierra Nevada Observatory in Spain.
Both timeseries were acquired in white light (without any filter).
Objects:
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RA (2000) DE Designation(s)
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16 56 31.34 +44 18 09.6 WASP-148 = TYC 3083-295-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
w148lc.dat 29 1088 New transit light curves
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See also:
J/A+A/640/A32 : WASP-148 velocity curve (Hebrard+, 2020)
Byte-by-byte Description of file: w148lc.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD Barycentric Julian date, TDB (BJD-2450000) (1)
13- 20 F8.6 --- Flux Normalized flux
22- 29 F8.6 --- e_Flux Flux error
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Note (1): Given as BJD 2450000+ in Barycentric Dynamical Time
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Acknowledgements:
Gracjan Maciejewski, gmac(at)umk.pl
Institute of Astronomy, Nicolaus Copernicus University, Poland
(End) Gracjan Maciejewski [Copernicus Univ.], Patricia Vannier [CDS] 24-Mar-2021