Stela Ishitani Silva
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View article: KMT-2022-BLG-1818Lb,c: A Cold Super-Jupiter with a Saturn Sibling
KMT-2022-BLG-1818Lb,c: A Cold Super-Jupiter with a Saturn Sibling Open
We present the discovery and analysis of the sixth microlensing two-planet system, KMT-2022-BLG-1818Lb,c, detected by a follow-up program targeting high-magnification events. The second planet was identified from implausible physical param…
View article: Six microlensing planets detected via sub-day signals during the 2023 -- 2024 season
Six microlensing planets detected via sub-day signals during the 2023 -- 2024 season Open
We present analyses of six microlensing events: KMT-2023-BLG-0548, KMT-2023-BLG-0830, KMT-2023-BLG-0949, KMT-2024-BLG-1281, KMT-2024-BLG-2059, and KMT-2024-BLG-2242. These were identified in KMTNet data from the 2023 -- 2024 seasons, selec…
View article: KMT-2022-BLG-0086: Another Binary-lens Binary-source Microlensing Event
KMT-2022-BLG-0086: Another Binary-lens Binary-source Microlensing Event Open
We present the analysis of a microlensing event KMT-2022-BLG-0086 of which the overall light curve is not described by a binary-lens single-source (2L1S) model, which suggests the existence of an extra lens or an extra source. We found tha…
View article: KMT-2022-BLG-0086: Another binary-lens binary-source microlensing event
KMT-2022-BLG-0086: Another binary-lens binary-source microlensing event Open
We present the analysis of a microlensing event KMT-2022-BLG-0086 of which the overall light curve is not described by a binary-lens single-source (2L1S) model, which suggests the existence of an extra lens or an extra source. We found tha…
View article: MOA-2022-BLG-091Lb and KMT-2024-BLG-1209Lb: Microlensing planets detected through weak caustic-crossing signals
MOA-2022-BLG-091Lb and KMT-2024-BLG-1209Lb: Microlensing planets detected through weak caustic-crossing signals Open
Aims . The light curves of the microlensing events MOA-2022-BLG-091 and KMT-2024-BLG-1209 exhibit anomalies with very similar features. These anomalies appear near the peaks of the light curves, where the magnifications are moderately high…
View article: KMT-2022-BLG-1818Lb,c: A Cold Super-Jupiter with a Saturn Sibling
KMT-2022-BLG-1818Lb,c: A Cold Super-Jupiter with a Saturn Sibling Open
We present the discovery and analysis of the sixth microlensing two-planet system, KMT-2022-BLG-1818Lb,c, detected by a follow-up program targeting high-magnification events. Both planets are subject to the well-known ''Close/Wide'' degene…
View article: Systematic Reanalysis of KMTNet Microlensing Events. II. Two New Planets in Giant-source Events
Systematic Reanalysis of KMTNet Microlensing Events. II. Two New Planets in Giant-source Events Open
In this work, we continue to apply the updated KMTNet tender-love care photometric pipeline to historical microlensing events. We apply the pipeline to a subsample of events from the KMTNet database, which we refer to as the giant source s…
View article: Microlensing events indicate that super-Earth exoplanets are common in Jupiter-like orbits
Microlensing events indicate that super-Earth exoplanets are common in Jupiter-like orbits Open
Exoplanets classified as super-Earths are commonly observed on short-period orbits, close to their host stars, but their abundance on wider orbits is poorly constrained. Gravitational microlensing is sensitive to exoplanets on wide orbits.…
View article: Analyses of anomalous lensing events detected from the UKIRT microlensing survey
Analyses of anomalous lensing events detected from the UKIRT microlensing survey Open
Aims. The United Kingdom Infrared Telescope (UKIRT) microlensing survey was conducted over four years, from 2016 to 2019, with the goal of serving as a precursor to future near-infrared microlensing surveys. Focusing on stars in the Galact…
View article: Analyses of anomalous lensing events detected from the UKIRT microlensing survey
Analyses of anomalous lensing events detected from the UKIRT microlensing survey Open
The United Kingdom Infrared Telescope (UKIRT) microlensing survey was conducted over four years, from 2016 to 2019, with the goal of serving as a precursor to future near-infrared microlensing surveys (Shvartzvald et al. 2017). Focusing on…
View article: Exoplanet transit candidate identification in <i>TESS</i> full-frame images via a transformer-based algorithm
Exoplanet transit candidate identification in <i>TESS</i> full-frame images via a transformer-based algorithm Open
The Transiting Exoplanet Survey Satellite (TESS) is surveying a large fraction of the sky, generating a vast database of photometric time-series data that requires thorough analysis to identify exoplanetary transit signals. Automated learn…
View article: Exoplanet Transit Candidate Identification in TESS Full-Frame Images via a Transformer-Based Algorithm
Exoplanet Transit Candidate Identification in TESS Full-Frame Images via a Transformer-Based Algorithm Open
The Transiting Exoplanet Survey Satellite (TESS) is surveying a large fraction of the sky, generating a vast database of photometric time series data that requires thorough analysis to identify exoplanetary transit signals. Automated learn…
View article: MOA-2022-BLG-033Lb, KMT-2023-BLG-0119Lb, and KMT-2023-BLG-1896Lb: Three low mass-ratio microlensing planets detected through dip signals
MOA-2022-BLG-033Lb, KMT-2023-BLG-0119Lb, and KMT-2023-BLG-1896Lb: Three low mass-ratio microlensing planets detected through dip signals Open
Aims . We examined the anomalies in the light curves of the lensing events MOA-2022-BLG-033, KMT-2023-BLG-0119, and KMT- 2023-BLG-1896. These anomalies share similar traits: they occur near the peak of moderately to highly magnified events…
View article: MOA-2022-BLG-033Lb, KMT-2023-BLG-0119Lb, and KMT-2023-BLG-1896Lb: Three low mass-ratio microlensing planets detected through dip signals
MOA-2022-BLG-033Lb, KMT-2023-BLG-0119Lb, and KMT-2023-BLG-1896Lb: Three low mass-ratio microlensing planets detected through dip signals Open
We examined the anomalies in the light curves of the lensing events MOA-2022-BLG-033, KMT-2023-BLG-0119, and KMT-2023-BLG-1896. We conducted detailed modeling of the light curves to uncover the nature of the anomalies. This modeling reveal…
View article: Short-period Heartbeat Binaries from TESS Full-frame Images
Short-period Heartbeat Binaries from TESS Full-frame Images Open
We identify 240 short-period ( P ≲ 10 days) binary systems in Transiting Exoplanet Survey Satellite data, 180 of which are heartbeat binaries. The sample is mostly a mix of A- and B-type stars and primarily includes eclipsing systems, wher…
View article: KMT-2021-BLG-0284, KMT-2022-BLG-2480, and KMT-2024-BLG-0412: Three microlensing events involving two lens masses and two source stars
KMT-2021-BLG-0284, KMT-2022-BLG-2480, and KMT-2024-BLG-0412: Three microlensing events involving two lens masses and two source stars Open
We carried out a project involving the systematic analysis of microlensing data from the Korea Microlensing Telescope Network survey. The aim of this project is to identify lensing events with complex anomaly features that are difficult to…
View article: Analysis of the Full Spitzer Microlensing Sample. I. Dark Remnant Candidates and Gaia Predictions
Analysis of the Full Spitzer Microlensing Sample. I. Dark Remnant Candidates and Gaia Predictions Open
In the pursuit of understanding the population of stellar remnants within the Milky Way, we analyze the sample of ∼950 microlensing events observed by the Spitzer Space Telescope between 2014 and 2019. In this study we focus on a subsample…
View article: The Microlensing Event Rate and Optical Depth from MOA-II 9 year Survey toward the Galactic Bulge
The Microlensing Event Rate and Optical Depth from MOA-II 9 year Survey toward the Galactic Bulge Open
We present measurements of the microlensing optical depth and event rate toward the Galactic bulge using the dataset from the 2006--2014 MOA-II survey, which covers 22 bulge fields spanning ~42 deg^2 between -5 deg < l < 10 deg and -7 deg …
View article: Microlensing brown-dwarf companions in binaries detected during the 2022 and 2023 seasons
Microlensing brown-dwarf companions in binaries detected during the 2022 and 2023 seasons Open
Aims. Building on previous works to construct a homogeneous sample of brown dwarfs in binary systems, we investigate microlensing events detected by the Korea Microlensing Telescope Network (KMTNet) survey during the 2022 and 2023 seasons.…
View article: Microlensing brown-dwarf companions in binaries detected during the 2022 and 2023 seasons
Microlensing brown-dwarf companions in binaries detected during the 2022 and 2023 seasons Open
Building on previous works to construct a homogeneous sample of brown dwarfs in binary systems, we investigate microlensing events detected by the Korea Microlensing Telescope Network (KMTNet) survey during the 2022 and 2023 seasons. Given…
View article: OGLE-2015-BLG-0845L: a low-mass M dwarf from the microlensing parallax and xallarap effects
OGLE-2015-BLG-0845L: a low-mass M dwarf from the microlensing parallax and xallarap effects Open
We present the analysis of the microlensing event OGLE-2015-BLG-0845, which was affected by both the microlensing parallax and xallarap effects. The former was detected via the simultaneous observations from the ground and Spitzer, and the…
View article: Short-period Variables in TESS Full-frame Image Light Curves Identified via Convolutional Neural Networks
Short-period Variables in TESS Full-frame Image Light Curves Identified via Convolutional Neural Networks Open
The Transiting Exoplanet Survey Satellite (TESS) mission measured light from stars in ∼85% of the sky throughout its 2 yr primary mission, resulting in millions of TESS 30-minute-cadence light curves to analyze in the search for transiting…
View article: Analysis of the full Spitzer microlensing sample I: Dark remnant candidates and Gaia predictions
Analysis of the full Spitzer microlensing sample I: Dark remnant candidates and Gaia predictions Open
In the pursuit of understanding the population of stellar remnants within the Milky Way, we analyze the sample of $\sim 950$ microlensing events observed by the Spitzer Space Telescope between 2014 and 2019. In this study we focus on a sub…
View article: KMT-2023-BLG-1866Lb: Microlensing super-Earth around an M dwarf host
KMT-2023-BLG-1866Lb: Microlensing super-Earth around an M dwarf host Open
Aims. We aim to investigate the nature of the short-term anomaly that appears in the lensing light curve of KMT-2023-BLG-1866. The anomaly was only partly covered due to its short duration of less than a day, coupled with cloudy weather co…
View article: Four microlensing giant planets detected through signals produced by minor-image perturbations
Four microlensing giant planets detected through signals produced by minor-image perturbations Open
Aims. We investigated the nature of the anomalies appearing in four microlensing events KMT-2020-BLG-0757, KMT-2022-BLG-0732, KMT-2022-BLG-1787, and KMT-2022-BLG-1852. The light curves of these events commonly exhibit initial bumps followe…
View article: Four microlensing giant planets detected through signals produced by minor-image perturbations
Four microlensing giant planets detected through signals produced by minor-image perturbations Open
We investigated the nature of the anomalies appearing in four microlensing events KMT-2020-BLG-0757, KMT-2022-BLG-0732, KMT-2022-BLG-1787, and KMT-2022-BLG-1852. The light curves of these events commonly exhibit initial bumps followed by s…
View article: Systematic KMTNet Planetary Anomaly Search. XI. Complete Sample of 2016 Subprime Field Planets
Systematic KMTNet Planetary Anomaly Search. XI. Complete Sample of 2016 Subprime Field Planets Open
Following Shin et al. (2023b), which is a part of the “Systematic KMTNet Planetary Anomaly Search” series (i.e., a search for planets in the 2016 KMTNet prime fields), we conduct a systematic search of the 2016 KMTNet subprime fields using…
View article: KMT-2023-BLG-1866Lb: Microlensing super-Earth around an M dwarf host
KMT-2023-BLG-1866Lb: Microlensing super-Earth around an M dwarf host Open
We investigate the nature of the short-term anomaly that appears in the lensing light curve of KMT-2023-BLG-1866. The anomaly was only partly covered due to its short duration, less than a day, coupled with cloudy weather conditions and re…
View article: KMT-2023-BLG-1431Lb: A New q < 10<sup>−4</sup> Microlensing Planet from a Subtle Signature
KMT-2023-BLG-1431Lb: A New q < 10<sup>−4</sup> Microlensing Planet from a Subtle Signature Open
The current studies of microlensing planets are limited by small number statistics. Follow-up observations of high-magnification microlensing events can efficiently form a statistical planetary sample. Since 2020, the Korea Microlensing Te…
View article: OGLE-2015-BLG-0845L: A low-mass M dwarf from the microlensing parallax and xallarap effects
OGLE-2015-BLG-0845L: A low-mass M dwarf from the microlensing parallax and xallarap effects Open
We present the analysis of the microlensing event OGLE-2015-BLG-0845, which was affected by both the microlensing parallax and xallarap effects. The former was detected via the simultaneous observations from the ground and Spitzer, and the…