skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Detection of planets in extremely weak central perturbation microlensing events via next-generation ground-based surveys

Abstract

Even though the recently discovered high-magnification event MOA-2010-BLG-311 had complete coverage over its peak, confident planet detection did not happen due to extremely weak central perturbations (EWCPs, fractional deviations of ≲ 2%). For confident detection of planets in EWCP events, it is necessary to have both high cadence monitoring and high photometric accuracy better than those of current follow-up observation systems. The next-generation ground-based observation project, Korea Microlensing Telescope Network (KMTNet), satisfies these conditions. We estimate the probability of occurrence of EWCP events with fractional deviations of ≤2% in high-magnification events and the efficiency of detecting planets in the EWCP events using the KMTNet. From this study, we find that the EWCP events occur with a frequency of >50% in the case of ≲ 100 M {sub E} planets with separations of 0.2 AU ≲ d ≲ 20 AU. We find that for main-sequence and sub-giant source stars, ≳ 1 M {sub E} planets in EWCP events with deviations ≤2% can be detected with frequency >50% in a certain range that changes with the planet mass. However, it is difficult to detect planets in EWCP events of bright stars like giant stars because it is easy for KMTNet to bemore » saturated around the peak of the events because of its constant exposure time. EWCP events are caused by close, intermediate, and wide planetary systems with low-mass planets and close and wide planetary systems with massive planets. Therefore, we expect that a much greater variety of planetary systems than those already detected, which are mostly intermediate planetary systems, regardless of the planet mass, will be significantly detected in the near future.« less

Authors:
; ;  [1]
  1. Korea Astronomy and Space Science Institute 776, Daedeokdae-ro, Yuseong-Gu, Daejeon 305-348 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22357085
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 785; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; DETECTION; DISTURBANCES; EFFICIENCY; GIANT STARS; GRAVITATIONAL LENSES; MASS; PERTURBATION THEORY; PLANETS; SATELLITES; TELESCOPES

Citation Formats

Chung, Sun-Ju, Lee, Chung-Uk, and Koo, Jae-Rim. Detection of planets in extremely weak central perturbation microlensing events via next-generation ground-based surveys. United States: N. p., 2014. Web. doi:10.1088/0004-637X/785/2/128.
Chung, Sun-Ju, Lee, Chung-Uk, & Koo, Jae-Rim. Detection of planets in extremely weak central perturbation microlensing events via next-generation ground-based surveys. United States. https://doi.org/10.1088/0004-637X/785/2/128
Chung, Sun-Ju, Lee, Chung-Uk, and Koo, Jae-Rim. 2014. "Detection of planets in extremely weak central perturbation microlensing events via next-generation ground-based surveys". United States. https://doi.org/10.1088/0004-637X/785/2/128.
@article{osti_22357085,
title = {Detection of planets in extremely weak central perturbation microlensing events via next-generation ground-based surveys},
author = {Chung, Sun-Ju and Lee, Chung-Uk and Koo, Jae-Rim},
abstractNote = {Even though the recently discovered high-magnification event MOA-2010-BLG-311 had complete coverage over its peak, confident planet detection did not happen due to extremely weak central perturbations (EWCPs, fractional deviations of ≲ 2%). For confident detection of planets in EWCP events, it is necessary to have both high cadence monitoring and high photometric accuracy better than those of current follow-up observation systems. The next-generation ground-based observation project, Korea Microlensing Telescope Network (KMTNet), satisfies these conditions. We estimate the probability of occurrence of EWCP events with fractional deviations of ≤2% in high-magnification events and the efficiency of detecting planets in the EWCP events using the KMTNet. From this study, we find that the EWCP events occur with a frequency of >50% in the case of ≲ 100 M {sub E} planets with separations of 0.2 AU ≲ d ≲ 20 AU. We find that for main-sequence and sub-giant source stars, ≳ 1 M {sub E} planets in EWCP events with deviations ≤2% can be detected with frequency >50% in a certain range that changes with the planet mass. However, it is difficult to detect planets in EWCP events of bright stars like giant stars because it is easy for KMTNet to be saturated around the peak of the events because of its constant exposure time. EWCP events are caused by close, intermediate, and wide planetary systems with low-mass planets and close and wide planetary systems with massive planets. Therefore, we expect that a much greater variety of planetary systems than those already detected, which are mostly intermediate planetary systems, regardless of the planet mass, will be significantly detected in the near future.},
doi = {10.1088/0004-637X/785/2/128},
url = {https://www.osti.gov/biblio/22357085}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 785,
place = {United States},
year = {Sun Apr 20 00:00:00 EDT 2014},
month = {Sun Apr 20 00:00:00 EDT 2014}
}