Summary Terrestrial and Neptune Mass Free-Floating Planet Candidates arxiv.org
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Researchers have identified potential low-mass free-floating planets from a survey data, with a significant number of high-quality single lens events detected.
Slides
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Key Points
- The MOA-II Galactic bulge survey data identified low-mass free-floating planet (FFP) candidates.
- The dataset included 6,111 microlensing candidates, with 3,535 high-quality single lens events.
- The study analyzed 2,489,362 CCD images over a period of 3146 days to improve the accuracy of lensing parameters.
- The researchers found 13 free-floating planet candidates out of 18 events that passed the selection criteria.
- The study used the Markov Chain Monte Carlo (MCMC) method to refine the best fit models and probability distributions for each event.
Summaries
25 word summary
Researchers have found low-mass free-floating planet candidates from the MOA-II Galactic bulge survey data, with 3,535 high-quality single lens events out of 6,111 microlensing candidates.
32 word summary
Researchers have discovered low-mass free-floating planet candidates from the MOA-II Galactic bulge survey data. The dataset used in this study includes 6,111 microlensing candidates, with 3,535 high-quality single lens events. The analysis
774 word summary
We report the discovery of low-mass free-floating planet (FFP) candidates from the MOA-II Galactic bulge survey data. The dataset includes 6,111 microlensing candidates, with 3,535 high-quality single lens events.
This paper presents a systematic analysis of the 9-year MOA-II survey towards the Galactic bulge from 2006-2014. The analysis reports the discovery of a terrestrial mass and a Neptune mass pair of free-floating planet (FFP)
The dataset used in this study includes 2,489,362 CCD images over a period of 3146 days. High cadence observation is important for detecting short timescale events and improving the accuracy of lensing parameters. The Optical Gravitational
This analysis improves upon previous work by extending the survey duration and using flux values scaled to the MOA reference images. The OGLE data, reduced with the OGLE DIA photometry pipeline, is used in combination with the MOA reference images.
In this study, the researchers analyzed a large number of objects and required that the detections be continuous and without significant time gaps. They found 2,409,061 variable objects at this stage. Moving objects, asteroids, satellites, and dust specks
The parameter errors are determined using the MINOS procedure of the MINUIT package, except in cases where MINOS failed. We select events with the peak time within the survey duration and a minimum impact parameter. The I-band source magnitudes are required to
In the study, 13 free-floating planet candidates were identified out of 18 events that passed the selection criteria. The sample did not include events with extremely large source sizes due to saturation in MOA. 66 candidates with possible microlensing par
In the final sample, there are 12 short time scale events with t E < 1 day for CR1 and CR2. The major source of false positives among the short events is flare stars and dwarf novae. We found counterpart objects in
In this study, the authors conducted modeling efforts to refine the best fit models and probability distributions for each event using the Markov Chain Monte Carlo (MCMC) method. They used the (tE, ?E) probability distributions to determine the
The mean and standard deviation of tE for certain events appear to be inconsistent with the classification of the event selection. This is due to differences between the refined fits and the fits used for the selection process. The refined fits used the FSPL model for
A list of terrestrial and Neptune mass free-floating planet candidates is provided. The list includes their identification numbers, coordinates, magnitudes, and other data. The fitting results and derived parameters for these candidates are also presented. The document mentions that the full list
The posterior distributions of parameters for short FSPL events and a BD candidate were analyzed using Bayesian analysis. The event MOA-9y-770 occurred in 2008 and showed a clear finite source effect. The estimated lens mass is close to Neptune
We use a conservative approach and confirm that the MOA-9y-5919L object is likely to have a terrestrial mass. The MOA-9y-1944 event is a brown dwarf candidate with a shorter timescale and a moderate
The detection efficiency for long timescale events is not affected by the range of lens-source relative proper motion (?rel) taken here. The source angular radius (? ?) is calculated from the assigned I s and used for the finite source effect in the simulated
The text discusses the limitations and calculations involved in determining the detection efficiency of terrestrial and Neptune mass free-floating planet candidates. The integrated detection efficiency is described as a function of the Einstein radius crossing time (tE) and the finite source parameter (?). The
The detection efficiency for finite source effects in free-floating planet (FFP) events is discussed. It is found that the efficiency is generally not affected by finite source effects for events with tE > 1 day, although this may vary depending on the
In a systematic analysis of the MOA-II survey, researchers identified 3,554 microlensing events that met certain criteria for statistical analysis. Among these events, they discovered 12 very short events, two of which were classified as free-floating planet
The text excerpt is a combination of references and figures related to terrestrial and Neptune mass free-floating planet candidates. The figures show the dependence of integrated detection efficiency on various variables and event selection criteria. The references include works by Bennett, Alard, Bens
This excerpt contains a list of references to various scientific papers and manuals. The references include authors, publication years, journal titles, and DOIs.
This document provides a list of references to studies and articles related to terrestrial and Neptune mass free-floating planet candidates. The references include various papers from different years and journals, covering topics such as stellar photometry, observational data, and astrophysical simulations.