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===Discovery of Gliese 832 (Super-Earth mass planet) in habitable zone=== ===Discovery of Gliese 832 (Super-Earth mass planet) in habitable zone===


In 2014, a second super-Earth mass planet, since given the scientific name '''Gliese 832''', was announced to orbit in the optimistic habitable zone but outside the conservative habitable zone of it's parent star.<ref name="Wittenmyer14" /> In 2014, a second planet was dicovered. This one is believed to be of super-Earth mass<ref>"Nearby Alien Planet May Be Capable of Supporting Life", Mike Wall, Space.com, June 25, 2014, http://www.space.com/26357-exoplanet-habitable-zone-gliese-832c.html</ref> and has since been given the scientific name '''Gliese 832'''.<ref>"Nearby Alien Planet May Be Capable of Supporting Life", Mike Wall, Space.com, June 25, 2014, http://www.space.com/26357-exoplanet-habitable-zone-gliese-832c.html</ref> It was announced to orbit in the optimistic habitable zone but outside the conservative habitable zone of it's parent star.<ref name="Wittenmyer14" />

The planet is believed to be in, or very close to, the right distance from it's sun to allow liquid water to exist on it's surface.<ref>"Nearby Alien Planet May Be Capable of Supporting Life", Mike Wall, Space.com, June 25, 2014, http://www.space.com/26357-exoplanet-habitable-zone-gliese-832c.html</ref>


===Search for cometary disc=== ===Search for cometary disc===

Revision as of 02:18, 28 June 2014

Gliese 832
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Grus
Right ascension 21 33 33.975
Declination −49° 00′ 32.42″
Apparent magnitude (V) 8.66
Characteristics
Spectral type M1.5V
B−V color index 1.52
Astrometry
Radial velocity (Rv)18.0 km/s
Proper motion (μ) RA: −46.05 ± 0.95 mas/yr
Dec.: −817.63 ± 0.59 mas/yr
Parallax (π)201.87 ± 1.01 mas
Distance16.16 ± 0.08 ly
(4.95 ± 0.02 pc)
Details
Mass0.45 ± 0.05 M☉
Radius0.48 R☉
Luminosity (bolometric)0.035 L☉
Surface gravity (log g)4.7 cgs
Temperature3,620 K
Metallicity−0.31 ± 0.2
Other designations
HD 204961, HIP 106440, LHS 3865
Database references
SIMBADdata
Exoplanet Archivedata
Data sources:
Hipparcos Catalogue,
HD

Gliese 832 (Gl 832 or GJ 832) is a red dwarf (spectrum M1.5V) in the constellation Grus. It is located relatively close to the Sun, at a distance of 16.1 light years. Gliese 832 has about half the mass and radius of the Sun.

Planetary system

Gliese 832 hosts two known planets.

Discovery of Jupiter mass planet

In September 2008, it was announced that a Jupiter-like planet, now designated as Gliese 832 b, had been detected in a long-period, near-circular orbit around this star (false alarm probability thus far: a negligible 0.05%). It would induce an astrometric perturbation on its star of at least 0.95 milliarcseconds and is thus a good candidate for being detected by astrometric observations. Despite its relatively large angular distance, direct imaging is problematic due to the star–planet contrast.

Discovery of Gliese 832 (Super-Earth mass planet) in habitable zone

In 2014, a second planet was dicovered. This one is believed to be of super-Earth mass and has since been given the scientific name Gliese 832. It was announced to orbit in the optimistic habitable zone but outside the conservative habitable zone of it's parent star.

The planet is believed to be in, or very close to, the right distance from it's sun to allow liquid water to exist on it's surface.

Search for cometary disc

If this system has a comet disc, it is undetectable "brighter than the fractional dust luminosity 10" of a recent Herschel study.

The Gliese 832 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
c ≥5.4±1 M🜨 0.162±0-017 35.68±0.03 0.18 ± 0.13 — —
b ≥0.64 ± 0.06 MJ 3.4 ± 0.4 3416 ± 131 0.12 ± 0.11 — —

X-ray source

Gliese 832 emits X-rays.

See also

Notes

  1. From L = 4πRσTeff, where L is the luminosity, R is the radius, Teff is the effective surface temperature and σ is the Stefan–Boltzmann constant.

References

  1. ^ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction" (PDF). Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ Bailey, J.; Butler, R. P.; Tinney, C. G.; Jones, H. R. A.; O'Toole, S.; Carter, B. D.; Marcy, G. W. (2008). "A Jupiter-like Planet Orbiting the Nearby M Dwarf GJ832". The Astrophysical Journal. 690 (1): 743–747. arXiv:0809.0172. Bibcode:2009ApJ...690..743B. doi:10.1088/0004-637X/690/1/743.
  3. Johnson, H. M.; Wright, C. D. (1983). "Predicted infrared brightness of stars within 25 parsecs of the sun". The Astrophysical Journal Supplement Series. 53: 643–771. Bibcode:1983ApJS...53..643J. doi:10.1086/190905.
  4. Interpolated value from NASA Exoplanet Archive, per: Bessell, M. S. (1995). "The Temperature Scale for Cool Dwarfs". In Tinney, C. G. (ed.). The Bottom of the Main Sequence - and Beyond, Proceedings of the ESO Workshop. Springer-Verlag. p. 123. Bibcode:1995bmsb.conf..123B. {{cite conference}}: Unknown parameter |booktitle= ignored (|book-title= suggested) (help)
  5. "Nearby Alien Planet May Be Capable of Supporting Life", Mike Wall, Space.com, June 25, 2014, http://www.space.com/26357-exoplanet-habitable-zone-gliese-832c.html
  6. "Nearby Alien Planet May Be Capable of Supporting Life", Mike Wall, Space.com, June 25, 2014, http://www.space.com/26357-exoplanet-habitable-zone-gliese-832c.html
  7. Wittenmyer, R.A.; Tuomi, M.; Butler, R.P.; Jones, H. R. A.; O'Anglada-Escude, G.; Horner, J.; Tinney, B.D.; Marshall; Carter (2014). "GJ 832c: A super-earth in the habitable zone". arXiv:1406.5587. {{cite journal}}: Cite journal requires |journal= (help)
  8. "Nearby Alien Planet May Be Capable of Supporting Life", Mike Wall, Space.com, June 25, 2014, http://www.space.com/26357-exoplanet-habitable-zone-gliese-832c.html
  9. B. C. Matthews; forthcoming study promised in Lestrade, J.-F.; et al. (2012). "A DEBRIS Disk Around The Planet Hosting M-star GJ581 Spatially Resolved with Herschel". Astronomy and Astrophysics. 548: A86. arXiv:1211.4898. Bibcode:2012A&A...548A..86L. doi:10.1051/0004-6361/201220325. {{cite journal}}: Explicit use of et al. in: |author2= (help)
  10. Schmitt, J. H. M. M.; Fleming, T. A.; Giampapa, M. S. (1995). "The X-ray view of the low-mass stars in the solar neighborhood". The Astrophysical Journal. 450 (9): 392–400. Bibcode:1995ApJ...450..392S. doi:10.1086/176149.
Known celestial objects within 20 light-years
Primary member type
Celestial objects by systems. Secondary members are listed in small print.
    0–10 ly →
Main-sequence
stars
A-type
G-type
M-type
(red dwarfs)
Brown dwarfs
L-type
  • Luhman 16 (6.5029±0.0011 ly)
  • T-type brown dwarf B
Sub-brown dwarfs
and rogue planets
Y-type
← 10–15 ly →
Subgiant stars
F-type
Main-sequence
stars
G-type
  • Tau Ceti (11.9118±0.0074 ly)
  • 4 (8?) planets: (b), (c), (d), e, f, g, h, (i)
K-type
M-type
(red dwarfs)
Degenerate
stars
White dwarfs
Brown dwarfs
T-type
← 15–20 ly    
Subgiant stars
G-type
Main-sequence
stars
A-type
G-type
K-type
M-type
(red dwarfs)
Degenerate
stars
White dwarfs
Brown dwarfs
L-type
T-type
Y-type
Sub-brown dwarfs
and rogue planets
Y-type
Italic are systems without known trigonometric parallax.
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