MOA-2007-BLG-192Lb

Last updated
MOA-2007-BLG-192Lb
MOA-2007-BLG-192L.jpg
An artist's impression of MOA-2007-BLG-192Lb orbiting its primary.
Discovery
Discovered by Bennett et al.
Discovery site Mount John University
Observatory,
Flag of New Zealand.svg  New Zealand
Discovery date30 May 2008
Gravitational microlensing
Orbital characteristics
2.02±0.44  AU [1]
StarMOA-2007-BLG-192L
Physical characteristics
Mass 12.49+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]

    Contents

    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 [lower-alpha 1]
    Right ascension 18h 18m 03.8s [1]
    Declination −27° 09′ 00.27″ [1]
    Characteristics
    Evolutionary stage Red dwarf
    Spectral type M [1]
    Astrometry
    Distance 7040±980  ly
    (2160±300  pc) [1]
    Details
    Mass 0.28±0.04 [1]   M☉
    Database references
    SIMBAD data

    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. [lower-alpha 1]

    Notes

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

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    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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