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Spitzer Microlensing Parallax for OGLE-2017-BLG-0896 Reveals a Counter-rotating Low-mass Brown Dwarf

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cris.lastimport.scopus2024-02-12T20:45:12Z
dc.abstract.enThe kinematics of isolated brown dwarfs in the Galaxy, beyond the solar neighborhood, is virtually unknown. Microlensing has the potential to probe this hidden population, as it can measure both the mass and five of the six phase-space coordinates (all except the radial velocity) even of a dark isolated lens. However, the measurements of both the microlens-parallax and finite-source effects are needed in order to recover the full information. Here, we combine the Spitzer satellite parallax measurement with the ground-based light curve, which exhibits strong finite-source effects, of event OGLE-2017-BLG-0896. We find two degenerate solutions for the lens (due to the known satellite-parallax degeneracy), which are consistent with each other except for their proper motion. The lens is an isolated brown dwarf with a mass of either 18 ± 1 M <SUB> J </SUB> or 20 ± 1 M <SUB> J </SUB>. This is the lowest isolated-object mass measurement to date, only ˜45% more massive than the theoretical deuterium-fusion boundary at solar metallicity, which is the common definition of a free-floating planet. The brown dwarf is located at either 3.9 ± 0.1 kpc or 4.1 ± 0.1 kpc toward the Galactic bulge, but with proper motion in the opposite direction of disk stars, with one solution suggesting it is moving within the Galactic plane. While it is possibly a halo brown dwarf, it might also represent a different, unknown population.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorSkowron, Jan
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorSoszyński, Igor
dc.contributor.authorSzymański, Michał
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorShvartzvald, Yossi
dc.contributor.authorYee, Jennifer C.
dc.contributor.authorLee, Chung-Uk
dc.contributor.authorNovati, Sebastiano Calchi
dc.contributor.authorBozza, Valerio
dc.contributor.authorBeichman, Charles A.
dc.contributor.authorBryden, Geoffery
dc.contributor.authorCarey, Sean
dc.contributor.authorGaudi, B. Scott
dc.contributor.authorHenderson, Calen B.
dc.contributor.authorZhu, Wei
dc.contributor.authorBachelet, Etienne
dc.contributor.authorBolt, Greg
dc.contributor.authorChristie, Grant
dc.contributor.authorMaoz, Dan
dc.contributor.authorNatusch, Tim
dc.contributor.authorPogge, Richard W.
dc.contributor.authorStreet, Rachel A.
dc.contributor.authorTan, Thiam-Guan
dc.contributor.authorTsapras, Yiannis
dc.contributor.authorMróz, Przemysław
dc.contributor.authorPoleski, Radosław
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorPawlak, Michał
dc.contributor.authorRybicki, Krzysztof
dc.contributor.authorIwanek, Patryk
dc.contributor.authorAlbrow, Michael D.
dc.contributor.authorCha, Sang-Mok
dc.contributor.authorChung, Sun-Ju
dc.contributor.authorGould, Andrew
dc.contributor.authorHan, Cheongho
dc.contributor.authorHwang, Kyu-Ha
dc.contributor.authorJung, Youn Kil
dc.contributor.authorKim, Dong-Jin
dc.contributor.authorKim, Hyoun-Woo
dc.contributor.authorKim, Seung-Lee
dc.contributor.authorLee, Dong-Joo
dc.contributor.authorLee, Yongseok
dc.contributor.authorPark, Byeong-Gon
dc.contributor.authorRyu, Yoon-Hyun
dc.contributor.authorShin, In-Gu
dc.contributor.authorZang, Weicheng
dc.contributor.authorDominik, Martin
dc.contributor.authorHelling, Christiane
dc.contributor.authorHundertmark, Markus
dc.contributor.authorJørgensen, Uffe G.
dc.contributor.authorLonga-Peña, Penelope
dc.contributor.authorLowry, Stephen
dc.contributor.authorSajadian, Sedighe
dc.contributor.authorBurgdorf, Martin J.
dc.contributor.authorCampbell-White, Justyn
dc.contributor.authorCiceri, Simona
dc.contributor.authorEvans, Daniel F.
dc.contributor.authorFujii, Yuri I.
dc.contributor.authorHinse, Tobias C.
dc.contributor.authorRahvar, Sohrab
dc.contributor.authorRabus, Markus
dc.contributor.authorSkottfelt, Jesper
dc.contributor.authorSnodgrass, Colin
dc.contributor.authorSouthworth, John
dc.date.accessioned2024-01-26T07:57:25Z
dc.date.available2024-01-26T07:57:25Z
dc.date.copyright2018-05-22
dc.date.issued2019
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number3
dc.description.versionORIGINAL_AUTHOR
dc.description.volume157
dc.identifier.doi10.3847/1538-3881/AAFE12
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/120400
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2019AJ....157..106S
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages106
dc.rightsOther
dc.sciencecloudnosend
dc.titleSpitzer Microlensing Parallax for OGLE-2017-BLG-0896 Reveals a Counter-rotating Low-mass Brown Dwarf
dc.typeJournalArticle
dspace.entity.typePublication