Limits on Planetary-mass Primordial Black Holes from the OGLE High-cadence Survey of the Magellanic Clouds

被引：10

作者：

Mroz, Przemek ^{[1
]}

Udalski, Andrzej ^{[1
]}

Szymanski, Michal K. ^{[1
]}

Soszynski, Igor ^{[1
]}

Pietrukowicz, Pawel ^{[1
]}

Kozlowski, Szymon ^{[1
]}

Poleski, Radoslaw ^{[1
]}

Skowron, Jan ^{[1
]}

Ulaczyk, Krzysztof ^{[1
,2
]}

Gromadzki, Mariusz ^{[1
]}

Rybicki, Krzysztof ^{[1
,3
]}

Iwanek, Patryk ^{[1
]}

Wrona, Marcin ^{[1
,4
]}

Mroz, Mateusz J. ^{[1
]}

机构：

[1] Univ Warsaw, Astron Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland

[2] Univ Warwick, Dept Phys, Coventry CV4 7 AL, England

[3] Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-76100 Rehovot, Israel

[4] Villanova Univ, Dept Astrophys & Planetary Sci, 800 Lancaster Ave, Villanova, PA 19085 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2024年 / 976卷 / 01期

关键词：

FREE-FLOATING PLANETS; GRAVITATIONAL-WAVES; GALACTIC HALO; DARK-MATTER; VMC SURVEY; RED CLUMP; SEARCH; PHASE; CONSTRAINTS; VARIABLES;

D O I：

10.3847/2041-8213/ad8e68

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Observations of the Galactic bulge revealed an excess of short-timescale gravitational microlensing events that are generally attributed to a large population of free-floating or wide-orbit exoplanets. However, in recent years, some authors suggested that planetary-mass primordial black holes (PBHs) comprising a substantial fraction (1%-10%) of the dark matter in the milky Way may be responsible for these events. If that was the case, a large number of short-timescale microlensing events should also be seen toward the Magellanic Clouds. Here, we report the results of a high-cadence survey of the Magellanic Clouds carried out from 2022 October through 2024 May as part of the Optical Gravitational Lensing Experiment. We observed almost 35 million source stars located in the central regions of the Large and Small Magellanic Clouds and found only one long-timescale microlensing event candidate. No short-timescale events were detected despite high sensitivity to such events. That allows us to infer the strongest available limits on the frequency of planetary-mass PBHs in dark matter. We find that PBHs and other compact objects with masses from 1.4 x 10-8 M circle dot (half of the Moon mass) to 0.013 M circle dot (planet/brown dwarf boundary) may comprise at most 1% of dark matter. That rules out the PBH origin hypothesis for the short-timescale events detected toward the Galactic bulge and indicates they are caused by the population of free-floating or wide-orbit planets.

引用

页数：10

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