PLANETARY AND OTHER SHORT BINARY MICROLENSING EVENTS FROM THE MOA SHORT-EVENT ANALYSIS

We present the analysis of four candidate short-duration binary microlensing events from the 2006-2007 MOA Project short-event analysis. Three of these events are determined to be microlensing events, while the fourth is most likely caused by stellar variability. One of these events, MOA-bin-1, is d...

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Published inThe Astrophysical journal Vol. 757; no. 2; pp. 1 - 17
Main Authors Bennett, D P, Sumi, T, Bond, I A, Kamiya, K, Abe, F, Botzler, C S, Fukui, A, Furusawa, K, Itow, Y, Korpela, A V
Format Journal Article
LanguageEnglish
Published United States 01.10.2012
Subjects
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Binary stars
DETECTION
EFFICIENCY
GRAVITATIONAL LENSES
MASS
MILKY WAY
Orbitals
ORBITS
Planet detection
Planetary mass
PLANETS
SATELLITES
Separation
STARS
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Summary:We present the analysis of four candidate short-duration binary microlensing events from the 2006-2007 MOA Project short-event analysis. Three of these events are determined to be microlensing events, while the fourth is most likely caused by stellar variability. One of these events, MOA-bin-1, is due to a planet, and it is the first example of a planetary event in which the stellar host is only detected through binary microlensing effects. This is one of the most massive and widest separation planets found by microlensing. The scarcity of such wide-separation planets also has implications for interpretation of the isolated planetary mass objects found by this analysis. In particular, if the entire isolated planet sample found by Sumi et al. consists of planets bound in wide orbits around stars, we find that it is likely that the median orbital semimajor axis is <30 AU.
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ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/757/2/119