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.

    Related Research Articles

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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 (2024-03-18). "Unveiling MOA-2007-BLG-192: An M Dwarf Hosting a Likely Super-Earth". arXiv: 2403.12118 [astro-ph.EP].
    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.