109 Piscium b

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109 Piscium b
Rendering of 109 Piscium b.png
Render of 109 Piscium b made with SpaceEngine
Discovery [1] [2]
Discovered by California and
Carnegie Planet Search
Discovery site W. M. Keck Observatory
Discovery dateNovember 1, 1999
Doppler spectroscopy
Orbital characteristics [3]
2.051+0.079
−0.087
  AU
Eccentricity 0.104+0.009
−0.008
2.944 ± 0.002 years (1,075.30 ± 0.73  d)
Inclination 86.116°+19.957°
−20.530°
38.852°+15.084°
−21.589°
2,449,333.898+14.739
−15.380
112.816°+5.254°
−5.448°
Semi-amplitude 114.583+1.067
−1.196
  m/s
Star 109 Piscium
Physical characteristics [3]
1.152 RJ [4]
Mass 5.743+1.011
−0.289
  MJ

    109 Piscium b (aka HD 10697 b) is a long-period extrasolar planet discovered in orbit around 109 Piscium. It is about 5.74 times the mass of Jupiter and is likely to be a gas giant. As is common for long-period planets discovered around other stars, it has an orbital eccentricity greater than that of Jupiter.

    The discoverers estimate its effective temperature as 264  K from solar heating, but it could be at least 10 to 20 K warmer because of internal heating. [2] It orbits within the habitable zone. [1]

    Preliminary astrometric measurements suggested that the orbital inclination is 170.3°, [5] yielding an object mass of 38 times that of Jupiter, which would make it a brown dwarf. However, subsequent analysis indicates that the precision of the measurements used to derive the astrometric orbit is insufficient to constrain the parameters. [6] A more plausible suggestion is that this planet shares its star's inclination, of 69+21
    26
    °. [7] [8] In 2022, the inclination and true mass of 109 Piscium b were measured via astrometry. The inclination estimate is consistent with that of the stellar rotation. [3]

    See also

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    References

    1. 1 2 "Astronomers discover six new planets orbiting nearby stars" (Press release). Kamuela, Hawaii: W. M. Keck Observatory. November 1, 1999. Retrieved December 19, 2017.
    2. 1 2 Vogt, Steven S.; et al. (2000). "Six New Planets from the Keck Precision Velocity Survey". The Astrophysical Journal. 536 (2): 902–914. arXiv: astro-ph/9911506 . Bibcode: 2000ApJ...536..902V . doi: 10.1086/308981 .
    3. 1 2 3 Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series . 262 (21): 21. arXiv: 2208.12720 . Bibcode:2022ApJS..262...21F. doi: 10.3847/1538-4365/ac7e57 . S2CID   251864022.
    4. "The Extrasolar Planet Encyclopaedia — 109 Psc b". Extrasolar Planets Encyclopaedia . Paris Observatory.
    5. Han, Inwoo; Black, David C.; Gatewood, George (2001). "Preliminary astrometric masses for proposed extrasolar planetary companions". The Astrophysical Journal Letters. 548 (1): L57–L60. Bibcode: 2001ApJ...548L..57H . doi:10.1086/318927. S2CID   120952927.
    6. Pourbaix, D.; Arenou, F. (2001). "Screening the Hipparcos-based astrometric orbits of sub-stellar objects". Astronomy and Astrophysics. 372 (3): 935–944. arXiv: astro-ph/0104412 . Bibcode: 2001A&A...372..935P . doi: 10.1051/0004-6361:20010597 .
    7. "hd_10697_b". Extrasolar Planets Encyclopaedia . 1995. Retrieved November 12, 2012.
    8. Roberto Sanchis-Ojeda; Josh N. Winn; Daniel C. Fabrycky (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten. 334 (1–2): 180–183. arXiv: 1211.2002 . Bibcode:2013AN....334..180S. doi:10.1002/asna.201211765. S2CID   38743202.