Analysis of the Full Spitzer Microlensing Sample. I. Dark Remnant Candidates and Gaia Predictions

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dc.citation.issue2
dc.citation.volume975
dc.contributor.authorRybicki KA
dc.contributor.authorShvartzvald Y
dc.contributor.authorYee JC
dc.contributor.authorNovati SC
dc.contributor.authorOfek EO
dc.contributor.authorBond IA
dc.contributor.authorBeichman C
dc.contributor.authorBryden G
dc.contributor.authorCarey S
dc.contributor.authorHenderson C
dc.contributor.authorZhu W
dc.contributor.authorFausnaugh MM
dc.contributor.authorWibking B
dc.contributor.authorUdalski A
dc.contributor.authorPoleski R
dc.contributor.authorMróz P
dc.contributor.authorSzymański MK
dc.contributor.authorSoszyński I
dc.contributor.authorPietrukowicz P
dc.contributor.authorKozłowski S
dc.contributor.authorSkowron J
dc.contributor.authorUlaczyk K
dc.contributor.authorIwanek P
dc.contributor.authorWrona M
dc.contributor.authorRyu Y-H
dc.contributor.authorAlbrow MD
dc.contributor.authorChung S-J
dc.contributor.authorGould A
dc.contributor.authorHan C-H
dc.contributor.authorHwang K-H
dc.contributor.authorJung YK
dc.contributor.authorShin I-G
dc.contributor.authorYang H
dc.contributor.authorZang W
dc.contributor.authorCha S-M
dc.contributor.authorKim D-J
dc.contributor.authorKim H-W
dc.contributor.authorKim S-L
dc.contributor.authorLee C-U
dc.contributor.authorLee D-J
dc.contributor.authorLee Y
dc.contributor.authorPark B-G
dc.contributor.authorPogge RW
dc.contributor.authorAbe F
dc.contributor.authorBarry R
dc.contributor.authorBennett DP
dc.contributor.authorBhattacharya A
dc.contributor.authorFukui A
dc.contributor.authorHamada R
dc.contributor.authorHamada S
dc.contributor.authorHamasaki N
dc.contributor.authorHirao Y
dc.contributor.authorIshitani Silva S
dc.contributor.authorItow Y
dc.contributor.authorKirikawa R
dc.contributor.authorKoshimoto N
dc.contributor.authorMatsubara Y
dc.contributor.authorMiyazaki S
dc.contributor.authorMuraki Y
dc.contributor.authorNagai T
dc.contributor.authorNunota K
dc.contributor.authorOlmschenk G
dc.contributor.authorRanc C
dc.contributor.authorRattenbury NJ
dc.contributor.authorSatoh YK
dc.contributor.authorSumi T
dc.contributor.authorSuzuki D
dc.contributor.authorTristram PJ
dc.contributor.authorVandorou A
dc.contributor.authorYama H
dc.contributor.authorWyrzykowski Ł
dc.contributor.authorHowil K
dc.contributor.authorKruszyńska K
dc.date.accessioned2025-01-10T01:32:01Z
dc.date.available2025-01-10T01:32:01Z
dc.date.issued2024-11-10
dc.description.abstractIn the pursuit of understanding the population of stellar remnants within the Milky Way, we analyze the sample of ∼950 microlensing events observed by the Spitzer Space Telescope between 2014 and 2019. In this study we focus on a subsample of nine microlensing events, selected based on their long timescales, small microlensing parallaxes, and joint observations by the Gaia mission, to increase the probability that the chosen lenses are massive and the mass is measurable. Among the selected events we identify lensing black holes and neutron star candidates, with potential confirmation through forthcoming release of the Gaia time-series astrometry in 2026. Utilizing Bayesian analysis and Galactic models, along with the Gaia Data Release 3 proper-motion data, four good candidates for dark remnants were identified: OGLE-2016-BLG-0293, OGLE-2018-BLG-0483, OGLE-2018-BLG-0662, and OGLE-2015-BLG-0149, with lens masses of 3.0-1.3+1.8M☉, 4.7-2.1+3.2 M☉, 3.15-0.64+0..66 M☉ and 1.40-0.55+0.75 M☉, respectively. Notably, the first two candidates are expected to exhibit astrometric microlensing signals detectable by Gaia, offering the prospect of validating the lens masses. The methodologies developed in this work will be applied to the full Spitzer microlensing sample, populating and analyzing the timescale (tE) versus parallax (πE) diagram to derive constraints on the population of lenses in general and massive remnants in particular.
dc.description.confidentialfalse
dc.edition.editionNovember 10 2024
dc.identifier.citationRybicki KA, Shvartzvald Y, Yee JC, Novati SC, Ofek EO, Bond IA, Beichman C, Bryden G, Carey S, Henderson C, Zhu W, Fausnaugh MM, Wibking B, Udalski A, Poleski R, Mróz P, Szymański MK, Soszyński I, Pietrukowicz P, Kozłowski S, Skowron J, Ulaczyk K, Iwanek P, Wrona M, Ryu YH, Albrow MD, Chung SJ, Gould A, Han C, Hwang KH, Jung YK, Shin IG, Yang H, Zang W, Cha SM, Kim DJ, Kim HW, Kim SL, Lee CU, Lee DJ, Lee Y, Park BG, Pogge RW, Abe F, Barry R, Bennett DP, Bhattacharya A, Fukui A, Hamada R, Hamada S, Hamasaki N, Hirao Y, Silva SI, Itow Y, Kirikawa R, Koshimoto N, Matsubara Y, Miyazaki S, Muraki Y, Nagai T, Nunota K, Greg O, Ranc C, Rattenbury NJ, Satoh YK, Sumi T, Suzuki D, Tristram PJ, Vandorou A, Yama H, Wyrzykowski Ł, Howil K, Kruszyńska K. (2024). Analysis of the Full Spitzer Microlensing Sample. I. Dark Remnant Candidates and Gaia Predictions. Astrophysical Journal. 975. 2.
dc.identifier.doi10.3847/1538-4357/ad7bb1
dc.identifier.eissn1538-4357
dc.identifier.elements-typejournal-article
dc.identifier.issn0004-637X
dc.identifier.number216
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/72350
dc.languageEnglish
dc.publisherAmerican Astronomical Society
dc.publisher.urihttps://iopscience.iop.org/article/10.3847/1538-4357/ad7bb1
dc.relation.isPartOfAstrophysical Journal
dc.rights(c) 2024 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectAstrometric microlensing effect
dc.subjectGravitational microlensing
dc.subjectSatellite microlensing parallax
dc.subjectMicrolensing parallax
dc.subjectBlack holes
dc.subjectNeutron stars
dc.subjectStellar remnants
dc.subjectGaia
dc.subjectStellar masses
dc.titleAnalysis of the Full Spitzer Microlensing Sample. I. Dark Remnant Candidates and Gaia Predictions
dc.typeJournal article
pubs.elements-id492377
pubs.organisational-groupOther
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