期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 853, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aaa5fb
关键词
gravitational lensing: micro; quasars: individual (RXJ 1131-1231); planets and satellites: general
资金
- NASA ADAP programs [NNX15AF04G, NNX17AF26G]
- NSF [AST-1413056]
- SAO [AR7-18007X, GO7-18102B]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1413056] Funding Source: National Science Foundation
- NASA [NNX15AF04G, 805286, 1002341, NNX17AF26G] Funding Source: Federal RePORTER
Previously, planets have been detected only in the Milky Way galaxy. Here, we show that quasar microlensing provides a means to probe extragalactic planets in the lens galaxy, by studying the microlensing properties of emission close to the event horizon of the supermassive black hole of the background quasar, using the current generation telescopes. We show that a population of unbound planets between stars with masses ranging from Moon to Jupiter masses is needed to explain the frequent Fe K alpha line energy shifts observed in the gravitationally lensed quasar RXJ 1131-1231 at a lens redshift of z = 0.295 or 3.8 billion lt-yr away. We constrain the planet mass-fraction to be larger than 0.0001 of the halo mass, which is equivalent to 2000 objects ranging from Moon to Jupiter mass per main-sequence star.
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