OGLE-2014-BLG-0319: A Sub-Jupiter-mass Planetary Event Encountered Degeneracy with Different Mass Ratios and Lens-source Relative Proper Motions

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dc.citation.issue3
dc.citation.volume163
dc.contributor.authorMiyazaki S
dc.contributor.authorSuzuki D
dc.contributor.authorUdalski A
dc.contributor.authorKoshimoto N
dc.contributor.authorBennett DP
dc.contributor.authorSumi T
dc.contributor.authorRattenbury N
dc.contributor.authorCheongho H
dc.contributor.authorAbe F
dc.contributor.authorBarry RK
dc.contributor.authorBhattacharya A
dc.contributor.authorBond IA
dc.contributor.authorFukui A
dc.contributor.authorFujii H
dc.contributor.authorHirao Y
dc.contributor.authorSilva SI
dc.contributor.authorItow Y
dc.contributor.authorKirikawa R
dc.contributor.authorKondo I
dc.contributor.authorMunford B
dc.contributor.authorMatsubara Y
dc.contributor.authorMatsumoto S
dc.contributor.authorMuraki Y
dc.contributor.authorOkamura A
dc.contributor.authorOlmschenk G
dc.contributor.authorRanc C
dc.contributor.authorSatoh YK
dc.contributor.authorToda T
dc.contributor.authorTristram PJ
dc.contributor.authorYama H
dc.contributor.authorYonehara A
dc.contributor.authorPoleski R
dc.contributor.authorMróz P
dc.contributor.authorSkowron J
dc.contributor.authorSzymański MK
dc.contributor.authorSoszyński I
dc.contributor.authorPietrukowicz P
dc.contributor.authorKozłowski S
dc.contributor.authorUlaczyk K
dc.contributor.authorWyrzykowski Ł
dc.date.accessioned2023-11-08T01:16:29Z
dc.date.accessioned2023-11-20T01:37:31Z
dc.date.available2022-02-10
dc.date.available2023-11-08T01:16:29Z
dc.date.available2023-11-20T01:37:31Z
dc.date.issued2022-03-01
dc.description.abstractWe report the discovery of a sub-Jovian-mass planet, OGLE-2014-BLG-0319Lb. The characteristics of this planet will be added into a future extended statistical analysis of the Microlensing Observations in Astrophysics (MOA) collaboration. The planetary anomaly of the light curve is characterized by MOA and OGLE survey observations and results in three degenerate models with different planetary-mass ratios of q = (10.3, 6.6, 4.5) × 10-4. We find that the last two models require unreasonably small lens-source relative proper motions of μ rel ∼1 mas yr-1. Considering Galactic prior probabilities, we rule out these two models from the final result. We conduct a Bayesian analysis to estimate physical properties of the lens system using a Galactic model and find that the lens system is composed of a 0.49-0.27+0.35MJup sub-Jovian planet orbiting a 0.47-0.25+0.33M⊙ M dwarf near the Galactic Bulge. This analysis demonstrates that Galactic priors are useful to resolve this type of model degeneracy. This is important for estimating the mass-ratio function statistically. However, this method would be unlikely successful in shorter timescale events, which are mostly due to low-mass objects, like brown dwarfs or free-floating planets. Therefore, careful treatment is needed for estimating the mass-ratio function of the companions around such low-mass hosts, which only the microlensing can probe.
dc.description.confidentialfalse
dc.identifier.author-urlhttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000753626600001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=c5bb3b2499afac691c2e3c1a83ef6fef
dc.identifier.citationMiyazaki S, Suzuki D, Udalski A, Koshimoto N, Bennett DP, Sumi T, Rattenbury N, Cheongho H, Abe F, Barry RK, Bhattacharya A, Bond IA, Fukui A, Fujii H, Hirao Y, Silva SI, Itow Y, Kirikawa R, Kondo I, Munford B, Matsubara Y, Matsumoto S, Muraki Y, Okamura A, Olmschenk G, Ranc C, Satoh YK, Toda T, Tristram PJ, Yama H, Yonehara A, Poleski R, Mróz P, Skowron J, Szymański MK, Soszyński I, Pietrukowicz P, Kozłowski S, Ulaczyk K, Wyrzykowski Ł. (2022). OGLE-2014-BLG-0319: A Sub-Jupiter-mass Planetary Event Encountered Degeneracy with Different Mass Ratios and Lens-source Relative Proper Motions. Astronomical Journal. 163. 3.
dc.identifier.doi10.3847/1538-3881/ac4960
dc.identifier.eissn1538-3881
dc.identifier.elements-typejournal-article
dc.identifier.issn0004-6256
dc.identifier.numberARTN 123
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/69108
dc.languageEnglish
dc.publisherIOP Publishing on behalf of the American Astronomical Society
dc.publisher.urihttps://iopscience.iop.org/article/10.3847/1538-3881/ac4960
dc.relation.isPartOfAstronomical Journal
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectGravitational microlensing (672)
dc.subjectBinary lens microlensing (2136)
dc.subjectplanet astronomy (486)
dc.subjectExoplanet detection methods (489)
dc.subjectExoplanets (498)
dc.titleOGLE-2014-BLG-0319: A Sub-Jupiter-mass Planetary Event Encountered Degeneracy with Different Mass Ratios and Lens-source Relative Proper Motions
dc.typeJournal article
pubs.elements-id451939
pubs.organisational-groupOther
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