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{{Short description|Star in the constellation Grus}}
{{Starbox begin
| name = Gliese 832
}}
{{Starbox image
|image={{Location map|100x100|AlternativeMap=Grus_constellation_map.svg
|alt=Gliese 832 is located in the constellation Grus.
|caption=Location of Gliese 832 in the constellation [[Grus (constellation)|Grus]]|border=infobox|mark=Red_pog.png|width=300
|label=Gliese 832
|position=top
|lat=30.6
|long=86.5
}}|caption=
}}
{{Starbox observe
| epoch = J2000.0
| constell = [[Grus (constellation)|Grus]]
| ra = {{RA|21|33|33.97512}}<ref name="GaiaDR3"/>
| dec = {{DEC|−49|00|32.3994}}<ref name="GaiaDR3"/>
| appmag_v = 8.66<ref name="bailey08"/>
}}
{{Starbox character 
|type=[[main-sequence star]]
| class = M2V<ref name=mnras452_3_2745/>
| r-i = 
| v-r = 
| b-v = 1.52<ref name="bailey08"/>
| u-b = 
| variable =
}}
{{Starbox astrometry
| radial_v = {{val|12.72|0.13}}<ref name="GaiaDR3"/>
| prop_mo_ra = {{val|−45.917}}
| prop_mo_dec = {{val|−816.875}}
| pm_footnote = <ref name="GaiaDR3"/>
| parallax = 201.3252
| p_error = 0.0237
| parallax_footnote = <ref name="GaiaDR3"/>
| absmag_v = 10.19<ref name="bailey08"/> 
}}
{{Starbox detail
| mass = 0.441 ± 0.011<ref name="Pineda2021"/>
| radius = 0.442 ± 0.018<ref name=Pineda2021/>
| luminosity_bolometric = 0.0276 ± 0.0009 <ref name=Pineda2021/>
| luminosity_visual = 0.007<ref name=luminosity_visual group=note/>
| gravity = 4.7<ref name="bailey08"/>
| temperature = {{val|3,539|79|74|fmt=commas}}<ref name=Pineda2021/>
| metal_fe = −0.06 ± 0.04<ref name="Lindgren2017"/>
| rotation = {{val|37.5|1.4|1.5|u=d}}<ref name=Gorrini2022/>
| age_gyr = {{val|6|1.5}}<ref name=Gorrini2022/>
}}
{{Starbox catalog
| names = {{odlist | 2MASS = J21333397-4900323 | CD = -49°13515 | GJ = 832 | HD = 204961 | HIP = 106440 | L = 354-89 | LHS = 3685 | PLX = 5190 | TIC = 139754153 | TYC = 8431-60-1}}<ref name="Simbad"/>
}}
{{Starbox reference
| Simbad = Gliese+832
| sn = The star
| Simbad2 = GJ+832+c
| sn2 = planet c
| Simbad3 = GJ+832+b
| sn3 = planet b
| ARICNS = 
| NSTED = Gliese+832
| EPE = GJ+832
}}
{{starbox sources|HIP|HD}}
{{Starbox end}}

'''Gliese 832''' ('''Gl 832''' or '''GJ 832''') is a [[red dwarf]] of [[Stellar classification|spectral type]] M2V in the southern [[constellation]] [[Grus (constellation)|Grus]].{{r|Mike Wall}} The [[apparent visual magnitude]] of 8.66<ref name="bailey08"/> means that it is too faint to be seen with the naked eye. It is located relatively close to the [[Sun]], at a distance of 16.2 [[light year]]s<ref name="GaiaDR3"/> and has a high [[proper motion]] of 818.16&nbsp;milliarcseconds per year.<ref name="GaiaDR3"/> Gliese 832 has just under half the mass and radius of the Sun.{{r|Mike Wall}} Its estimated rotation period is a relatively leisurely 46&nbsp;days.<ref name=mnras452_3_2745/> The star is roughly 6 billion years old.<ref name=Gorrini2022/>

This star achieved [[perihelion]] some 52,920&nbsp;years ago when it came within an estimated {{Convert|4.817|pc|ly|abbr=on|lk=off|order=flip}} of the Sun.<ref name=aa575_A35/>

Gliese 832 emits X-rays.<ref name=Schmitt/> Despite the strong [[Flare star|flare activity]], Gliese 832 is producing on average less ionizing radiation than the Sun. Only at extremely short radiation wavelengths (<50nm) does its radiation intensity rise above the level of quiet Sun, but does not reach levels typical for active Sun.<ref>{{cite journal |year=2016|last1=Fontenla|first1=J. M.|last2=Linsky|first2=Jeffrey L.|last3=Garrison|first3=Jesse|last4=France|first4=Kevin|last5=Buccino|first5=A.|last6=Mauas|first6=Pablo|last7=Vietes|first7=Mariela|last8=Walkowicz|first8=Lucianne M. |title=Semi-Empirical Modeling of the Photosphere, Chromopshere, Transition Region, and Corona of the M-Dwarf Host Star Gj 832 |journal=The Astrophysical Journal |volume=830 |issue=2 |doi=10.3847/0004-637X/830/2/154 |bibcode=2016ApJ...830..154F |pages=154|hdl=11336/21732|s2cid=119279568 |hdl-access=free |doi-access=free |arxiv=1608.00934 }}</ref>

==Planetary system==
Gliese 832 hosts one known planet, with a second planet having been refuted in 2022.<ref name=Gorrini2022/> No additional planets were found as of 2024.<ref>https://arxiv.org/abs/2409.01173</ref>
{{OrbitboxPlanet begin
| table_ref = <ref name="Xiao2023"/>
| period_unit = year
}}
{{OrbitboxPlanet
| exoplanet = [[Gliese 832 b|b]]
| mass = {{val|0.8|0.12|0.11}}
| period = {{val|9.88|0.34|0.33}}
| semimajor = {{val|3.53|0.15|0.16}}
| eccentricity = {{val|0.069|0.026|0.027}}
| inclination = {{val|54.9|6.6|4.9}} or {{val|125.1|4.9|6.6}}
}}
{{Orbitbox end}}

===Gliese 832 b===
{{Main|Gliese 832 b}}
In September 2008, it was announced that a [[Jupiter]]-like planet, designated [[Gliese 832 b]], had been detected in a long-period, near-circular orbit around this star, with a false alarm probability of a negligible 0.05%. It would induce an [[astrometry|astrometric]] perturbation on its star of at least 0.95 [[Minute of arc|milliarcsecond]]s 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.<ref name="bailey08" /> The orbital solution of the planet was refined in 2011.<ref name=Bonfils2011/> In 2023, an astrometric detection of the planet was announced, determining its inclination and revealing a [[true mass]] 80% the mass of Jupiter.<ref name="Xiao2023"/>

===Gliese 832 c===
Gliese 832 c was believed to be of [[super-Earth]] mass.{{r|Mike Wall}} It was announced to orbit in the optimistic [[habitable zone]] but outside the conservative habitable zone of its parent star.<ref name="Wittenmyer14" /> The planet Gliese 832 c was believed to be in, or very close to, the right distance from its sun to allow liquid water to exist on its surface.{{r|Mike Wall}} However, doubts were raised about the existence of planet c by a 2015 study, which found that its orbital period is close to the stellar rotation period.<ref name=mnras452_3_2745/> The existence of the planet was refuted in 2022, when a study found that the [[Doppler spectroscopy|radial velocity]] signal shows characteristics of a signal originating from stellar activity, and not from a planet.<ref name=Gorrini2022/>

The region between Gliese 832 b and where Gliese 832 c would be is a zone where additional planets are possible.<ref>{{citation|arxiv=1604.04544|title=Dynamics of a Probable Earth-mass Planet in GJ 832 System|year=2016|doi=10.3847/1538-4357/aa80e2|last1=Satyal|first1=S.|last2=Griffith|first2=J.|last3=Musielak|first3=Z. E.|journal=The Astrophysical Journal|volume=845|issue=2|page=106|s2cid=118663957 |doi-access=free }}</ref>

===Search for cometary disc===
If this system has a comet disc, it is not "brighter than the fractional dust luminosity 10<sup>−5</sup>" according to a 2012 [[Herschel Space Observatory|Herschel]] study.<ref name=nodebris/>

==See also==
* [[List of nearest stars]]
* [[List of extrasolar planets]]

==Notes==
{{reflist|group=note|refs=

{{#tag:ref|Using the absolute visual magnitude of Gliese 832 <math>\scriptstyle M_{V_{\ast}}=10.19</math> and the absolute visual magnitude of the Sun <math>\scriptstyle M_{V_{\odot}}=4.83</math>, the visual luminosity can be calculated by <math>\scriptstyle \frac{L_{V_{\ast}}}{L_{V_{\odot}}}=10^{0.4\left(M_{V_{\odot}} - M_{V_{\ast}}\right)}</math>|group="note"|name=luminosity_visual}}

}}

==References==
{{reflist|refs=

<ref name="GaiaDR3">{{Cite Gaia DR3|6562924609150908416}}</ref>

<ref name="Pineda2021">{{cite journal
 | title=The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars
 | last1=Pineda | first1=J. Sebastian | last2=Youngblood | first2=Allison
 | last3=France | first3=Kevin 
 | journal=The Astrophysical Journal
 | volume=918 | issue=1 | id=40 | pages=23 | date=September 2021
 | doi=10.3847/1538-4357/ac0aea | arxiv=2106.07656
 | bibcode=2021ApJ...918...40P  | s2cid=235435757 | doi-access=free }}</ref>

<ref name=nodebris>
B. C. Matthews; forthcoming study promised in {{Cite journal
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 |date=2012
 |title=A DEBRIS Disk Around The Planet Hosting M-star GJ581 Spatially Resolved with Herschel
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 |arxiv=1211.4898
 |bibcode=2012A&A...548A..86L
 |doi=10.1051/0004-6361/201220325
|last3=Sibthorpe
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 |last6=Bryden
 |first6=G.
 |last7=Greaves
 |first7=J. S.
 |last8=Thilliez
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 |last9=Moro-Martín
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 |last10=Booth
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 |last11=Dent
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 |last17=Phillips
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 |first18=D. R.
 |last19=Su
 |first19=K. Y. L.
 |last20=Wilner
 |first20=D. J.
 |s2cid=53704989
 }}</ref>

<ref name="bailey08">
{{cite journal
 |last1=Bailey |first1=J.
 |last2=Butler |first2=R. P.
 |last3=Tinney |first3=C. G.
 |last4=Jones |first4=H. R. A.
 |last5=O'Toole |first5=S.
 |last6=Carter |first6=B. D.
 |last7=Marcy |first7=G. W.
 |year=2009
 |title=A Jupiter-like Planet Orbiting the Nearby M Dwarf GJ832
 |journal=[[The Astrophysical Journal]]
 |volume=690 |issue=1 |pages=743&ndash;747
 |arxiv=0809.0172
 |bibcode=2009ApJ...690..743B
 |doi=10.1088/0004-637X/690/1/743
|s2cid=17172233
 }}</ref>

<ref name="Wittenmyer14">
{{cite journal
 |last1=Wittenmyer |first1=R.A.
 |last2=Tuomi |first2=M.
 |last3=Butler |first3=R.P.
 |last4=Jones |first4=H. R. A.
 |last5=O'Anglada-Escude |first5=G.
 |last6=Horner |first6=J.
 |last7=Tinney |first7=C.G.
 |last8=Marshall |first8=J.P.
 |last9=Carter |first9=B.D.
 |date=2014
 |title= GJ 832c: A super-earth in the habitable zone
 |journal=The Astrophysical Journal
 |volume=1406
 |issue=2
 |pages=5587
 |arxiv=1406.5587
|bibcode = 2014ApJ...791..114W |display-authors=9
 |last10=Bailey
 |first10=J.
 |last11=Salter
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 |last12=O'Toole
 |first12=S. J.
 |last13=Wright
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 |last14=Crane
 |first14=J. D.
 |last15=Schectman
 |first15=S. A.
 |last16=Arriagada
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 |last17=Thompson
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 |last18=Minniti
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 |last19=Jenkins
 |first19=J. S.
 |last20=Diaz
 |first20=M. |doi=10.1088/0004-637X/791/2/114
 |s2cid=12157837
 }}</ref>

<ref name=Schmitt>
{{ cite journal
 |last1=Schmitt |first1=J. H. M. M.
 |last2=Fleming |first2=T. A.
 |last3=Giampapa |first3=M. S.
 |date=1995
 |title=The X-ray view of the low-mass stars in the solar neighborhood
 |journal=[[The Astrophysical Journal]]
 |volume=450 |issue=9 |pages=392–400
 |bibcode=1995ApJ...450..392S
 |doi=10.1086/176149
|doi-access=free
 }}</ref>

<ref name="Mike Wall">"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 {{Webarchive|url=https://web.archive.org/web/20180712234753/http://www.space.com/26357-exoplanet-habitable-zone-gliese-832c.html |date=2018-07-12 }}</ref>

<ref name=aa575_A35>{{citation
 | last1=Bailer-Jones | first1=C. A. L. 
 | title=Close encounters of the stellar kind 
 | journal=Astronomy & Astrophysics
 | volume=575 | id=A35 | pages=13 | date=March 2015
 | doi=10.1051/0004-6361/201425221 | bibcode=2015A&A...575A..35B 
 | arxiv = 1412.3648 | s2cid=59039482 
 | postscript=.
}}</ref>

<ref name="Lindgren2017">{{cite journal | title=Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature | url=https://www.aanda.org/articles/aa/full_html/2017/08/aa30715-17/aa30715-17.html | last1=Lindgren | first1=Sara | last2=Heiter | first2=Ulrike | journal=Astronomy and Astrophysics | volume=604 | pages=A97 | year=2017 | arxiv=1705.08785 | bibcode=2017A&A...604A..97L | doi=10.1051/0004-6361/201730715 | s2cid=119216828 | access-date=2018-09-03 | archive-date=2021-01-23 | archive-url=https://web.archive.org/web/20210123180529/https://www.aanda.org/articles/aa/full_html/2017/08/aa30715-17/aa30715-17.html | url-status=live }}</ref>

<ref name="Simbad">{{cite simbad | title=Gliese 832 | access-date=2018-09-23 }}</ref>

<ref name=mnras452_3_2745>{{citation
 | display-authors=1
 | last1=Suárez Mascareño | first1=A. | last2=Rebolo | first2=R.
 | last3=González Hernández | first3=J. I. | last4=Esposito | first4=M.
 | title=Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators 
 | journal=Monthly Notices of the Royal Astronomical Society
 | volume=452 | issue=3 | pages=2745–2756 | date=September 2015
 | doi=10.1093/mnras/stv1441 | doi-access=free | bibcode=2015MNRAS.452.2745S 
 | arxiv=1506.08039 | s2cid=119181646 | postscript=.
}}</ref>

<ref name=Bonfils2011>{{cite journal |doi=10.1051/0004-6361/201014704 |last1=Bonfils |first1=Xavier |last2=Delfosse |first2=Xavier |last3=Udry |first3=Stéphane |last4=Forveille |first4=Thierry |last5=Mayor |first5=Michel |last6=Perrier |first6=Christian |last7=Bouchy |first7=François |last8=Gillon |first8=Michaël |last9=Lovis |first9=Christophe |last10=Pepe |first10=Francesco |last11=Queloz |first11=Didier |last12=Santos |first12=Nuno C. |last13=Ségransan |first13=Damien |last14=Bertaux |first14=Jean-Loup |title=The HARPS search for southern extra-solar planets XXXI. The M-dwarf sample |journal=Astronomy and Astrophysics |date=2011 |volume=549 |bibcode=2013A&A...549A.109B |arxiv = 1111.5019 |pages=A109 |s2cid=119288366 }}</ref>

<ref name=Gorrini2022>{{cite journal |last1=Gorrini |first1=P. |last2=Astudillo-Defru |first2=N. |display-authors=etal |date=August 2022 |title=Detailed stellar activity analysis and modelling of GJ 832: Reassessment of the putative habitable zone planet GJ 832c |journal=[[Astronomy & Astrophysics]] |volume=664 |issue= |pages=A64 |doi=10.1051/0004-6361/202243063 |arxiv=2206.07552 |bibcode=2022A&A...664A..64G|s2cid=249674385 }}</ref>

<ref name="Xiao2023">{{cite journal |last1=Xiao |first1=Guang-Yao |last2=Liu |first2=Yu-Juan |display-authors=etal |date=March 2023 |title=The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements |journal=[[Research in Astronomy and Astrophysics]] |volume= 23|issue= 5|pages= |doi= 10.1088/1674-4527/accb7e|arxiv=2303.12409|bibcode=2023RAA....23e5022X |s2cid=257663647 }}</ref>

}}

{{Sky|21|33|33.9752|-|49|00|32.422|16.200}}
{{nearest systems|4}}
{{Stars of Grus}}

{{DEFAULTSORT:Gliese 832}}
[[Category:Gliese 832| ]]
[[Category:Local Bubble]]
[[Category:M-type main-sequence stars]]
[[Category:Henry Draper Catalogue objects|204961]]
[[Category:Hipparcos objects|106440]]
[[Category:Grus (constellation)]]
[[Category:Durchmusterung objects|CD-49 13515]]
[[Category:2MASS objects|J21333397-4900323]]
[[Category:Planetary systems with one confirmed planet]]
[[Category:TIC objects|139754153]]
[[Category:Astronomical X-ray sources]]

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Template:R (view source) (template editor protected)
Template:R/ref (view source) (template editor protected)
Template:R/superscript (view source) (template editor protected)
Template:R/where (view source) (template editor protected)
Template:RA (view source) (template editor protected)
Template:Reflist (view source) (protected)
Template:Reflist/styles.css (view source) (protected)
Template:Right ascension (view source) (template editor protected)
Template:Rnd (view source) (template editor protected)
Template:Round (view source) (template editor protected)
Template:SDcat (view source) (protected)
Template:Short description (view source) (protected)
Template:Short description/lowercasecheck (view source) (protected)
Template:Sky (view source) (template editor protected)
Template:Sky/styles.css (view source) (template editor protected)
Template:Small (view source) (protected)
Template:Solar luminosity (view source) (template editor protected)
Template:Solar mass (view source) (template editor protected)
Template:Solar radius (view source) (template editor protected)
Template:Star systems within 10 light-years (edit)
Template:Star systems within 10–15 light-years (edit)
Template:Star systems within 15–20 light-years (edit)
Template:Starbox astrometry (view source) (template editor protected)
Template:Starbox begin (view source) (template editor protected)
Template:Starbox catalog (view source) (template editor protected)
Template:Starbox character (view source) (template editor protected)
Template:Starbox data source (edit)
Template:Starbox detail (view source) (template editor protected)
Template:Starbox end (view source) (template editor protected)
Template:Starbox image (view source) (extended confirmed protected)
Template:Starbox observe (view source) (template editor protected)
Template:Starbox reference (view source) (template editor protected)
Template:Starbox sources (edit)
Template:Stars of Grus (edit)
Template:Str rep (view source) (protected)
Template:Su (view source) (template editor protected)
Template:Sub (view source) (template editor protected)
Template:Sup (view source) (template editor protected)
Template:Trim (view source) (protected)
Template:Val (view source) (template editor protected)
Template:Webarchive (view source) (template editor protected)
Module:Arguments (view source) (protected)
Module:Check for unknown parameters (view source) (protected)
Module:Citation/CS1 (view source) (protected)
Module:Citation/CS1/COinS (view source) (protected)
Module:Citation/CS1/Configuration (view source) (protected)
Module:Citation/CS1/Date validation (view source) (protected)
Module:Citation/CS1/Identifiers (view source) (protected)
Module:Citation/CS1/Utilities (view source) (protected)
Module:Citation/CS1/Whitelist (view source) (protected)
Module:Citation/CS1/styles.css (view source) (protected)
Module:Convert (view source) (template editor protected)
Module:Convert/data (view source) (template editor protected)
Module:Convert/text (view source) (template editor protected)
Module:Disambiguation/templates (view source) (protected)
Module:Engvar (view source) (template editor protected)
Module:Format link (view source) (template editor protected)
Module:Gapnum (view source) (extended confirmed protected)
Module:GetParameters (view source) (protected)
Module:Hatnote (view source) (template editor protected)
Module:Hatnote/styles.css (view source) (template editor protected)
Module:Hatnote list (view source) (template editor protected)
Module:Icon (view source) (template editor protected)
Module:Icon/data (view source) (template editor protected)
Module:If empty (view source) (protected)
Module:Labelled list hatnote (view source) (template editor protected)
Module:Location map (view source) (template editor protected)
Module:Location map/data/100x100 (edit)
Module:Location map/styles.css (view source) (template editor protected)
Module:Math (view source) (protected)
Module:Navbar (view source) (protected)
Module:Navbar/configuration (view source) (protected)
Module:Navbar/styles.css (view source) (protected)
Module:Navbox (view source) (template editor protected)
Module:Navbox/configuration (view source) (template editor protected)
Module:Navbox/styles.css (view source) (template editor protected)
Module:Pagetype (view source) (protected)
Module:Pagetype/config (view source) (protected)
Module:Pagetype/disambiguation (view source) (protected)
Module:Pagetype/rfd (view source) (protected)
Module:Pagetype/setindex (view source) (protected)
Module:Pagetype/softredirect (view source) (protected)
Module:SDcat (view source) (protected)
Module:Separated entries (view source) (protected)
Module:String (view source) (protected)
Module:String2 (view source) (template editor protected)
Module:Su (view source) (template editor protected)
Module:TableTools (view source) (protected)
Module:Val (view source) (template editor protected)
Module:Val/units (view source) (template editor protected)
Module:Webarchive (view source) (template editor protected)
Module:Webarchive/data (view source) (template editor protected)
Module:Wikitext Parsing (view source) (protected)
Module:Yesno (view source) (protected)

Return to Gliese 832.

Retrieved from "https://en.wikipedia.org/wiki/Gliese_832"