MOA-2007-BLG-192Lb

MOA-2007-BLG-192Lb
An artist's impression of MOA-2007-BLG-192Lb orbiting its primary.
Discovery
Discovered byBennett et al.
Discovery siteMount John University
Observatory,
 New Zealand
Discovery date30 May 2008
Gravitational microlensing
Orbital characteristics
Semi-major axis
2.02±0.44 AU[1]
StarMOA-2007-BLG-192L
Physical characteristics
Mass12.49+65.47
−8.03 ME (likely between 3 and 12 ME)[1]

    MOA-2007-BLG-192Lb, occasionally shortened to MOA-192 b,[2] is an extrasolar planet approximately 7,000 light-years away in the constellation of Sagittarius. The planet was discovered orbiting the low-mass star MOA-2007-BLG-192L. It was found when it caused a gravitational microlensing event on May 24, 2007, which was detected as part of the MOA-II microlensing survey at the Mount John University Observatory in New Zealand.[3]

    The mass of the planet is not well-known. It is anything between 2.75 and 105 Earth masses (ME), although it is more likely to be between 3 and 12 ME. The mass range also means that the planet's classification varies, from a Super-Earth to a Sub-Saturn. It is located at 2.02 astronomical units from its host star.[1]

    Host star

    MOA-2007-BLG-192L
    Observation data
    Epoch J2000.0      Equinox J2000.0
    Constellation Sagittarius[a]
    Right ascension 18h 18m 03.8s[1]
    Declination −27° 09′ 00.27″[1]
    Characteristics
    Evolutionary stage Red dwarf
    Spectral type M[1]
    Astrometry
    Distance7040±980 ly
    (2160±300 pc)[1]
    Details
    Mass0.28±0.04[1] M☉
    Database references
    SIMBADdata

    MOA-2007-BLG-192L is a red dwarf star, one of the smallest and least massive type of stars, as well as one of the most numerous in the Milky Way.[4] It was initially estimated to have a mass 6% the mass of the Sun, which would probably be too low to sustain nuclear fusion at its core, making it a dimly glowing brown dwarf.[5] However, this mass was based on an erroneous parallax, and a further analysis suggest a higher mass of 0.24 M☉. This would make it a red dwarf.[1]

    Both MOA-2007-BLG-192L and its planet are located at a distance of 2,160 pc (7,000 ly) from Earth,[1] in the direction of the constellation Sagittarius.[a]

    Notes

    1. 1 2 Obtained with a right ascension of 18h 18m 03.8s and a declination of −27° 09′ 00.27″[1] on this website.

    References

    1. 1 2 3 4 5 6 7 8 9 10 Terry, Sean K.; Beaulieu, Jean-Philippe; Bennett, David P.; Hamdorf, Euan; Bhattacharya, Aparna; Chaudhry, Viveka; Cole, Andrew A.; Koshimoto, Naoki; Anderson, Jay; Bachelet, Etienne; Blackman, Joshua W.; Bond, Ian A.; Lu, Jessica R.; Marquette, Jean Baptiste; Ranc, Clément (2024-07-15). "Unveiling MOA-2007-BLG-192: An M Dwarf Hosting a Likely Super-Earth". The Astronomical Journal. 168 (2): 72. arXiv:2403.12118. doi:10.3847/1538-3881/ad5444. ISSN 1538-3881.
    2. ↑ Planet Quest: New Worlds Atlas Archived 2008-07-01 at the Wayback Machine, JPL. Accessed on line July 2, 2008.
    3. ↑ Bennett, D. P.; Bond, I. A.; Udalski, A.; et al. (2008). "A Low-Mass Planet with a Possible Sub-Stellar-Mass Host in Microlensing Event MOA-2007-BLG-192". The Astrophysical Journal. 684 (1): 663–683. arXiv:0806.0025. Bibcode:2008ApJ...684..663B. doi:10.1086/589940. S2CID 14467194.
    4. ↑ "Red dwarf star | Definition, Facts, & Temperature | Britannica". Britannica. Retrieved 2024-07-23.
    5. ↑ Smallest Extrasolar Planet Portends Other Earths Archived 2009-02-28 at the Wayback Machine, Richard A. Kerr, ScienceNOW Daily News, June 2, 2008. Accessed on line June 16, 2008.
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