Candidates for Transiting Planets in OGLE-IV Galactic Bulge Fields
M. Mróz1, P. Pietrukowicz1, R. Poleski1, A. Udalski1, M.K. Szymański1, M. Gromadzki1, K. Ulaczyk2, S. Kozłowski1, J. Skowron1, D.M. Skowron1, I. Soszyński1, P. Mróz1, M. Ratajczak1, K.A. Rybicki1,3, P. Iwanek1 and M. Wrona1
1Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
2Department of Physics, University of Warwick, Coventry CV4 7AL, UK
3Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100, Israel
Received: October 9, 2023
ABSTRACT
We present results of a search for transiting exoplanets in
10-yr long photometry with thousands of epochs taken in the direction
of the Galactic bulge. This photometry was collected in the fourth phase
of the Optical Gravitational Lensing Experiment (OGLE-IV). Our search
covered ≈222 000 stars brighter than I=15.5 mag. Selected
transits were verified using a probabilistic method. The search resulted in
99 high-probability candidates for transiting exoplanets. The estimated
distances to these targets are between 0.4 kpc and 5.5 kpc, which is
a significantly wider range than for previous transit searches. The planets
found are Jupiter-size, with the exception of one (named OGLE-TR-1003b)
located in the hot Neptune desert. If the candidate is confirmed, it can
be important for studies of highly irradiated intermediate-size
planets. The existing long-term, high-cadence photometry of our
candidates increases the chances of detecting transit timing variations
at long timescales. Selected candidates will be observed by the future
NASA flagship mission, the Nancy Grace Roman Space Telescope, in its
search for Galactic bulge microlensing events, which will further enhance
the photometric coverage of these stars.
Key words:
planetary systems - Planets and satellites: detection -
Planets and satellites: fundamental parameters - Techniques: photometric
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