Epsilon Eridani b
Extrasolar planet List of extrasolar planets
An artist's impression of Epsilon Eridiani b
orbiting its parent sun
Parent star

<tr> <td colspan="2">Star</td> <td>Epsilon Eridani</td></tr><tr> <td colspan="2">Constellation</td> <td>Eridanus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>03h 32m 55.8442s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−09° 27′ 29.744″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>3.73</td></tr><tr><td colspan="2">Distance</td><td>10.5 ± 0.03 ly
(3.218 ± 0.009 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K2V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>~3.4 AU</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>~2500 d</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>~1.56 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>7 August 2000</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Hatzes et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy</td></tr><tr> <td colspan="2">Discovery site</td> <td>United States</td></tr><tr> <td colspan="2">Discovery status</td> <td>Unconfirmed</td></tr>

Other designations
18 Eridani b, Gliese 144 b, HD 22049 b, HIP 16537 b, HR 1084 b

<tr style="background-color: #A0B0FF;"><td align=center colspan=3>Database references</td></tr><tr valign=baseline><td colspan=2>Extrasolar Planets
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

Epsilon Eridani b is an unconfirmed extrasolar planet approximately 10 light-years away orbiting the star Epsilon Eridani, in the constellation of Eridanus (the River).

Discovery Edit

The planet's existence was suspected by a Canadian team led by Bruce Campbell and Gordon Walker in the early 1990s, but their observations were not definitive enough to make a solid discovery. Its formal discovery was announced on August 7, 2000 by a team led by Artie Hatzes. The discoverers gave its mass as 1.2 ± 0.33 times that of Jupiter, with a mean distance of 3.4 AU from the star.[1] Observers, including Geoffrey Marcy, suggested that more information on the star's Doppler noise behaviour created by its large and varying magnetic field was needed before the planet could be confirmed.[2]

In 2006, the Hubble Space Telescope made Astrometric measurements and confirmed the existence of the planet.[3] These observations indicated that the planet has a mass 1.5 times that of Jupiter and shares the same plane as the outer dust disk observed around the star.[4] The derived orbit from these measurements is eccentric: either 0.25[4] or 0.7.[5]

Meanwhile the Spitzer Space Telescope detected an asteroid belt at roughly 3 AU from the star.[6] In 2009 Brogi's team claimed that the proposed planet's eccentricity and this belt were inconsistent: the planet would pass through the asteroid belt and rapidly clear it of material.[7]

The planet and the inner belt may be reconciled if that belt's material had migrated in from the outer comet belt (also known to exist).[8]

See also Edit

References Edit

  1. Hatzes, Artie P.; Cochran, William D.; McArthur, Barbara; Baliunas, Sallie L.; Walker, Gordon A. H.; Campbell, Bruce; Irwin, Alan W.; Yang, Stephenson; Kürster, Martin; Endl, Michael; Els, Sebastian; Butler, R. Paul; Marcy, Geoffrey W. (2000). Evidence for a Long-Period Planet Orbiting ε Eridani. The Astrophysical Journal 544 (2): L145–L148.
  2. Template:Cite conference
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  4. 4.0 4.1 Benedict (2006). The Extrasolar Planet ε Eridani b: Orbit and Mass. The Astronomical Journal 132 (5): 2206–2218.
  5. Butler (2006). {{{title}}}. The Astrophysical Journal 646.
  6. Backman, D.; Marengo, M.; Stapelfeldt, K.; Su, K.; Wilner, D.; Dowell, C. D.; Watson, D.; Stansberry, J.; Rieke, G.; Megeath, T.; Fazio, G.; Werner, M. (2009). Epsilon Eridani's Planetary Debris Disk: Structure and Dynamics Based on Spitzer and Caltech Submillimeter Observatory Observations. The Astrophysical Journal 690 (2): 1522–1538.
  7. Brogi, M.; Marzari, F.; Paolicchi, P. (2009). Dynamical stability of the inner belt around Epsilon Eridani. Astronomy and Astrophysics 499 (2): L13–L16.
  8. Martin Reidemeister, Alexander V. Krivov, Christopher C. Stark, Jean-Charles Augereau, Torsten Loehne, Sebastian Mueller (2010). The cold origin of the warm dust around epsilon Eridani. Astronomy & Astrophysics 527: A57.

External links Edit

Coordinates: Sky map 03h 32m 55.8442s, −09° 27′ 29.744″

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