A Newtonian Model for the WASP-148 Exoplanetary System Enhanced with TESS and Ground-based Photometric Observations
G. Maciejewski1, M. Fernández2, A. Sota2 and A.J. García Segura2
1Institute of Astronomy, Faculty of Physics, Astronomy and Informatics,
Nicolaus Copernicus University, Grudzi�dzka 5, 87-100 Toru�, Poland
2Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía 3, 18008 Granada, Spain
Received: December 1, 2020
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.
Key words:
Planetary systems - Stars: individual: WASP-148 - Planets and satellites: individual: WASP-148 b, WASP-148 c
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