OGLE-2007-BLG-349(AB)b
Artist's impression of OGLE-2007-BLG-349(AB)b (foreground) orbiting its parent stars (upper right).
Discovery
Discovered byHubble Space Telescope
Discovery date22 September 2016
Gravitational microlensing
Orbital characteristics
StarOGLE-2007-BLG-349
Physical characteristics
Mass80 (± 13)[1] MEarth

    OGLE-2007-BLG-349(AB)b[note 1][2] is a circumbinary extrasolar planet about 8,000 light-years away in the constellation of Sagittarius.[3] It is the first circumbinary exoplanet to be discovered using the microlensing method of detecting exoplanets.[1]

    Characteristics

    Mass and orbit

    OGLE-2007-BLG-349L(AB)b is a super-Neptune, an exoplanet that has a mass and radius larger than that of Neptune. It has a mass of around 80 MEarth.[1] This is somewhat close to the mass of Saturn, 95 MEarth, so OGLE-2007-BLG-349L(AB)b can also be considered a gas giant. It orbits at a distance of around 2.9 AU in a circumbinary orbit, meaning it orbits around two stars.

    Host star

    The planet orbits in a circumbinary (M-type) binary star system named OGLE-2007-BLG-349L. They orbit around each other roughly every 9 days.[1] The stars have masses of 0.41 and 0.30 M☉, respectively. The age of the system, radii and temperatures of the stars are not known. In comparison, the Sun is 4.6 billion years old[4][5] and has a surface temperature of 5778 K.[6] The star's apparent magnitude, or how bright it appears from Earth's perspective, is 14.3. Therefore, it is too dim to be seen with the naked eye.

    See also

    Notes

    1. ↑ The initial paper intentionally refers to the planet as planet "c", as their solution to "an apparent inconsistency" in exoplanet naming convention. Other sources, such as the SIMBAD Astronomical Database and Extrasolar Planets Encyclopaedia, refer to it as planet "b", however NASA Exoplanet Archive does not.

    References

    1. 1 2 3 4 Bennett, D. P.; Rhie, S. H.; Udalski, A.; Gould, A.; Tsapras, Y.; Kubas, D.; Bond, I. A.; Greenhill, J.; Cassan, A. (September 21, 2016). "The First Circumbinary Planet Found by Microlensing: OGLE-2007-BLG-349L(AB)c". The Astronomical Journal. 152 (5): 125. arXiv:1609.06720. Bibcode:2016AJ....152..125B. doi:10.3847/0004-6256/152/5/125. S2CID 54034608.
    2. ↑ "OGLE-2007-BLG-349L (AB) b". Extrasolar Planets Encyclopaedia. October 28, 1995. Retrieved January 14, 2019.
    3. ↑ "Hubble finds planet orbiting pair of stars 8,000 light-years away". NASA Goddard Space Flight Center. Retrieved September 4, 2017.
    4. ↑ Bonanno, A.; Schlattl, H.; Paternò, L. (August 2002). "The age of the Sun and the relativistic corrections in the EOS". Astronomy & Astrophysics. 390 (3): 1115–1118. arXiv:astro-ph/0204331. Bibcode:2002A&A...390.1115B. doi:10.1051/0004-6361:20020749. ISSN 0004-6361.
    5. ↑ Connelly, James N.; Bizzarro, Martin; Krot, Alexander N.; Nordlund, Åke; Wielandt, Daniel; Ivanova, Marina A. (November 2, 2012). "The Absolute Chronology and Thermal Processing of Solids in the Solar Protoplanetary Disk". Science. 338 (6107): 651–655. Bibcode:2012Sci...338..651C. doi:10.1126/science.1226919. ISSN 0036-8075. PMID 23118187. S2CID 21965292.
    6. ↑ Williams, D. R. (July 1, 2013). "Sun Fact Sheet". NASA Goddard Space Flight Center. Retrieved September 4, 2017.


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