Astronomy:OGLE-2015-BLG-1319
,_Figure_1.jpg) Artist’s impression of OGLE-2015-BLG-1319 | |
| Discovery | |
|---|---|
| Discovered by | Spitzer Space Telescope, Swift, Optical Gravitational Lensing Experiment |
| Discovery date | June/July, 2015 |
| Microlensing | |
| Orbital characteristics | |
| ~0.25 or ~45 AU | |
| Star | OGLE-2015-BLG-1319L |
OGLE-2015-BLG-1319 is a binary system comprising a brown dwarf that orbits a K-type star, located 16307 light years away from the Solar System.[1]
Discovery
It was discovered during June–July 2015 using the gravitational microlensing detection method through the joint effort between Swift, Spitzer Space Telescope, and the ground-based Optical Gravitational Lensing Experiment, the first time two space telescopes have observed the same microlensing event. This method was possible because of the large separation between the two spacecraft: Swift is in low Earth orbit while Spitzer is more than one AU distant in an Earth-trailing heliocentric orbit. This separation provided significantly different perspectives of the brown dwarf, allowing for constraints to be placed on some of the object's physical characteristics.[2][3]
Orbit
The brown dwarf, OGLE-2015-BLG-1319Lb, may be unusually close to its host star. It orbits at a distance of either 0.25 AU or 45 AU.[1] If the former is correct, it would sit within the brown dwarf desert; only around 1% of all Sun-like stars have brown dwarfs closer than 3 AU.[2]
Host star
The host star, OGLE-2015-BLG-1319L, is a K-type star. With an apparent magnitude of 22.0, it is only visible though strong telescopes, and is only 0.58 M☉.[4]
References
- ↑ 1.0 1.1 Shvartzvald, Y. et al. (November 2016). "The First Simultaneous Microlensing Observations by Two Space Telescopes: Spitzer and Swift Reveal a Brown Dwarf in Event OGLE-2015-BLG-1319". The Astrophysical Journal 831 (2): 183. doi:10.3847/0004-637X/831/2/183. Bibcode: 2016ApJ...831..183S.
- ↑ 2.0 2.1 "NASA Space Telescopes Pinpoint Elusive Brown Dwarf". NASA. November 10, 2016. http://www.jpl.nasa.gov/news/news.php?feature=6673.
This article incorporates text from this source, which is in the public domain.
- ↑ "Brown Dwarf Microlensing Program". NASA. November 10, 2016. https://www.nasa.gov/image-article/brown-dwarf-microlensing-diagram/. This article incorporates text from this source, which is in the public domain.
- ↑ "Exoplanet Kyoto–OGLE-2015-BLG-1319L". November 10, 2016. https://www.exoplanetkyoto.org/exohtml/OGLE-2015-BLG-1319_L.html. This article incorporates text from this source, which is in the public domain.
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