Astronomy:OGLE-2016-BLG-1928

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OGLE-2016-BLG-1928
Discovery
Discovered byMróz et al.
Discovery siteOptical Gravitational Lensing Experiment
Discovery date2020
Microlensing[1]
Orbital characteristics
StarN/A
Physical characteristics
Mass0.3 or 2 M🜨[1]


OGLE-2016-BLG-1928 is an exoplanet located in the constellation Sagittarius, discovered via gravitational microlensing.[2][lower-alpha 1] It is likely to be a rogue (free-floating) planet, as no host star was detected within 8 astronomical units.[1]

This likely free-floating planet has a mass of either 0.3 M⊕, if it is located within the galactic disk, or 2 M🜨 if it is located in the galactic bulge. The former scenario is the most likely.[1] Low-mass rogue planets like OGLE-2016-BLG-1928 are thought to be very common in the Milky Way, but few have been spotted as they are very hard to detect.[3] It is believed that these planets have been ejected from their origin planetary systems.[4]

Discovery

An illustration of how the microlensing method works.

OGLE-2016-BLG-1928 was discovered through a gravitational microlensing event observed by the Optical Gravitational Lensing Experiment (OGLE) and Korea Microlensing Telescope Network (KMT-N) surveys. This event had the shortest duration of any observed, at just 41.5 minutes. The discovery was announced in 2020 by a team of astronomers led by P. Mroz.[1] A microlensing event happens when the observer, the planet and a background star are aligned. The planet's gravitational effect magnifies, distorts and creates multiple images of the background star.[4] Microlensing is an useful method for detecting planets that emit little or no radiation.[4]

See also

Notes

  1. ↑ Constellation was inferred from exoplanet.eu's coordinates using this website.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Mróz, Przemek; Poleski, Radosław; Gould, Andrew; Udalski, Andrzej; Sumi, Takahiro; and; Szymański, Michał K.; Soszyński, Igor et al. (October 2020). "A Terrestrial-mass Rogue Planet Candidate Detected in the Shortest-timescale Microlensing Event" (in en). The Astrophysical Journal Letters 903 (1): L11. doi:10.3847/2041-8213/abbfad. ISSN 2041-8205. Bibcode: 2020ApJ...903L..11M. 
  2. ↑ Martin, Pierre-Yves (2023). "Planet OGLE-2016-BLG-1928" (in en). https://exoplanet.eu/catalog/ogle_2016_blg_1928--7508/. 
  3. ↑ Wall, Mike (November 4, 2020). "Tiny rogue planet is the smallest free-floating exoplanet candidate yet". https://www.space.com/smallest-rogue-planet-discovery. 
  4. ↑ 4.0 4.1 4.2 "First 'Earth Without A Sun' Discovered: Thousands More To Be Revealed Soon" (in en-US). 2020-11-09. https://bigthink.com/starts-with-a-bang/first-earth-without-a-sun-discovered-thousands-more-to-be-revealed-soon/. 




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