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Upsilon Andromedae e is the proposed outermost extrasolar planet orbiting the star Upsilon Andromedae in the constellation of Andromeda. If it exists, this planet would be one of the most Jupiter-like exoplanets found in terms of mass and semi-major axis. However, subsequent studies have found that the apparent planetary signal is more likely to be an instrumental artifact.[3][4]

Upsilon Andromedae e
An artist's impression of Ups And e
Discovery
Discovered byCuriel et al.
Discovery siteBaja California
Discovery dateNovember 22, 2010 (announced)
December 2, 2010 (published)
Detection method
Doppler spectroscopy
Orbital characteristics
Apastron5.2738 ± 0.0029 AU (788.95 ± 0.43 million km)
Periastron5.2175 ± 0.003 AU (780.53 ± 0.45 million km)
Semi-major axis
5.2456 ± 0.00067 AU (784.731 ± 0.100 million km)[1]
Eccentricity0.0055±0.0004[2]
Orbital period (sidereal)
3,848.86±0.74[2] d
~10.53946[2] y
Argument of periastron
367.3 ± 2.3[1]
StarUpsilon Andromedae

    Discovery


    This planet was discovered on November 22, 2010, but the discovery paper was not released until December 2.[1] It was the fourth time in 2010 that a fourth planet has been discovered in a planetary system, the others being Gliese 876 e, HD 10180 e, and HR 8799 e; in no earlier year during the exoplanet era had more than one fourth planet been discovered.

    Subsequent studies in 2011 and 2014, while finding some evidence for a fourth planet, found large inconsistencies in the estimated orbital period of Upsilon Andromedae e depending on what dataset was used,[5] suggesting that the apparent planetary signal is more likely to be an instrumental artifact.[3][4]

    Astronomers initially thought that a fourth planet in this system could not exist because it would have made the planetary system unstable and would have been ejected.[6] But in 2007, an island region of stability was reported where a fourth planet could exist.[7]


    Characteristics


    If it exists, Upsilon Andromedae e would have a minimum mass slightly greater than Jupiter's and orbit at a similar distance as Jupiter from the Sun, at 5.2456 AU compared to 5.2043 AU for Jupiter. Although only the minimum mass is determined since inclination is not yet known, its true mass might be much greater. It would take over a decade to orbit the star. At an eccentricity of 0.00536, the planet's orbit would be more circular than that of any of the planets in the Solar System.[1]


    See also



    References


    1. Curiel, S.; et al. (2011). "A fourth planet orbiting υ Andromedae". Astronomy & Astrophysics. 525: A78. Bibcode:2011A&A...525A..78C. doi:10.1051/0004-6361/201015693.
    2. Ligi, R.; et al. (2012). "A new interferometric study of four exoplanet host stars : θ Cygni, 14 Andromedae, υ Andromedae and 42 Draconis". Astronomy & Astrophysics. 545: A5. arXiv:1208.3895. Bibcode:2012A&A...545A...5L. doi:10.1051/0004-6361/201219467.
    3. McArthur, Barbara E.; et al. (2014). "Astrometry, Radial Velocity, and Photometry: The HD 128311 System Remixed with Data from HST, HET, and APT". The Astrophysical Journal. 795 (1). Bibcode:2014ApJ...795...41M. doi:10.1088/0004-637X/795/1/41.
    4. Deitrick, R.; et al. (January 2015). "The Three-dimensional Architecture of the υ Andromedae Planetary System". The Astrophysical Journal. 798 (1). arXiv:1411.1059. Bibcode:2015ApJ...798...46D. doi:10.1088/0004-637X/798/1/46.
    5. Tuomi, M.; Pinfield, D.; Jones, H. R. A. (2014). "Application of Bayesian model inadequacy criterion for multiple data sets to radial velocity models of exoplanet systems". Astronomy & Astrophysics. 532. arXiv:1106.5981. Bibcode:2011A&A...532A.116T. doi:10.1051/0004-6361/201117278.
    6. Ford, Eric B.; et al. (2005). "Planet-planet scattering in the upsilon Andromedae system". Nature. 434 (7035): 873–876. arXiv:astro-ph/0502441. Bibcode:2005Natur.434..873F. doi:10.1038/nature03427. PMID 15829958.
    7. Rory Barnes; Richard Greenberg (2008). "Extrasolar Planet Interactions". arXiv:0801.3226v1 [astro-ph].

    На других языках

    [de] Ypsilon Andromedae e

    Ypsilon Andromedae e (abgekürzt auch υ And e) ist ein extrasolarer Planet, der den rund 44,25 Lichtjahre von der Sonne entfernten Hauptreihenstern Titawin A im Doppelsternsystem Titawin im Sternbild Andromeda umkreist. Er ist der äußerste der vier bekannten Planeten im Planetensystem des Sterns.
    - [en] Upsilon Andromedae e


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