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Measurement of Source Star Colors with the K2C9-CFHT Multi-color Microlensing Survey

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dc.abstract.enMicrolensing events observed from locations separated by ˜au have different peak times and peak magnifications due to microlensing parallax. K2 Campaign 9 (K2C9) was the first space-based microlensing parallax survey capable of measuring microlensing parallaxes of free-floating planet candidate microlensing events. Simultaneous to K2C9 observations we conducted the K2C9 Canada-France-Hawaii Telescope Multi-Color Microlensing Survey (K2C9-CFHT MCMS) in order to measure the colors of microlensing source stars to improve the accuracy of K2C9’s parallax measurements. We describe the difference imaging photometry analysis of the K2C9-CFHT MCMS observations, and present the project’s first data release. This includes instrumental difference flux light curves in up to three filters (g, r, and i) of 217 microlensing events identified by other microlensing surveys, reference image photometry of more than 30 million point sources calibrated to PanSTARRS data release 1 photometry with an absolute accuracy better than 0.02 mag . We derive accurate analytic transformations between the PanSTARRS bandpasses and the Kepler bandpass, as well as color-surface brightness relations in the PanSTARRS bandpasses. To demonstrate the use of our data set, we analyze ground-based and K2 data of a short timescale microlensing event, OGLE-2016-BLG-0795. We find the event has a timescale t <SUB>E</SUB> = 4.5 ± 0.1 days and microlens parallax π <SUB>E</SUB> = 0.09 ± 0.03 or 0.91 ± 0.04, subject to the standard satellite parallax degeneracy. We argue that the smaller value of the parallax is more likely, which implies that the lens is likely a stellar-mass object in the Galactic bulge as opposed to a super-Jupiter mass object in the Galactic disk.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorZang, Weicheng
dc.contributor.authorPenny, Matthew T.
dc.contributor.authorZhu, Wei
dc.contributor.authorMao, Shude
dc.contributor.authorFouqué, Pascal
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorHwang, Kyu-Ha
dc.contributor.authorWang, Tianshu
dc.contributor.authorHuang, Chelsea
dc.contributor.authorBoyajian, Tabetha. S.
dc.contributor.authorBarentsen, Geert
dc.date.accessioned2024-01-25T08:30:44Z
dc.date.available2024-01-25T08:30:44Z
dc.date.copyright2018-03-25
dc.date.issued2018
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number992
dc.description.versionORIGINAL_AUTHOR
dc.description.volume130
dc.identifier.doi10.1088/1538-3873/AADCD3
dc.identifier.issn0004-6280
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/112080
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2018PASP..130j4401Z
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofPublications of the Astronomical Society of the Pacific
dc.relation.pages104401
dc.rightsOther
dc.sciencecloudnosend
dc.titleMeasurement of Source Star Colors with the K2C9-CFHT Multi-color Microlensing Survey
dc.typeJournalArticle
dspace.entity.typePublication