Gliese 832#Gliese 832 c

{{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|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

| ra = {{RA|21|33|33.97512}}

| dec = {{DEC|−49|00|32.3994}}

| appmag_v = 8.66

}}

{{Starbox character

|type=main-sequence star

| class = M2V

| r-i =

| v-r =

| b-v = 1.52

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|12.72|0.13}}

| prop_mo_ra = {{val|−45.917}}

| prop_mo_dec = {{val|−816.875}}

| pm_footnote =

| parallax = 201.3252

| p_error = 0.0237

| parallax_footnote =

| absmag_v = 10.19

}}

{{Starbox detail

| mass = 0.441 ± 0.011

| radius = 0.442 ± 0.018

| luminosity_bolometric = 0.0276 ± 0.0009

| luminosity_visual = 0.007

| gravity = 4.7

| temperature = {{val|3,539|79|74|fmt=commas}}

| metal_fe = −0.06 ± 0.04

| rotation = {{val|37.5|1.4|1.5|u=d}}

| age_gyr = {{val|6|1.5}}

}}

{{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}}

}}

{{Starbox reference

| Simbad = Gliese+832

| sn = The star

| Simbad2 = GJ+832+c

| sn2 = planet c

| Simbad3 = GJ+832+b

| sn3 = planet b

| ARICNS =

| NSTED = Gliese832

| EPE = GJ+832

}}

Gliese 832 (Gl 832 or GJ 832) is a red dwarf star of spectral type M2V in the southern constellation Grus.{{r|Mike Wall}} The apparent visual magnitude of 8.66 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-years and has a high proper motion of 818.16 milliarcseconds per year. 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 days. The star is roughly 6 billion years old.

This star achieved perihelion some 52,920 years ago when it came within an estimated {{Convert|4.817|pc|ly|abbr=on|lk=off|order=flip}} of the Sun.

Gliese 832 emits X-rays. Despite the strong 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 the quiet Sun, but does not reach levels typical for the active Sun.{{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 }}

Planetary system

Gliese 832 hosts one known planet, with a second planet having been refuted in 2022. No additional planets were found as of 2024.

{{OrbitboxPlanet begin

| table_ref =

| period_unit = day

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|0.99|0.09|0.08}}

| period = {{val|3853|51|47}}

| semimajor = {{val|3.7|0.1}}

| eccentricity = {{val|0.05|0.03}}

| inclination = {{val|51|3}} or {{val|134|3}}

}}

=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 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. The planet was detected astrometrically by two different 2023 studies, determining its inclination and revealing a true mass close to the mass of Jupiter.

=Gliese 832 c=

Gliese 832 c was the second reported planet in the Gliese 832 system, believed to be of super-Earth mass (minimum mass about 5 times the mass of Earth).{{r|Mike Wall}} It was announced to orbit in the optimistic habitable zone but outside the conservative habitable zone of its parent star. 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. The existence of the planet was refuted in 2022, when a study found that the radial velocity signal shows characteristics of a signal originating from stellar activity, and not from a planet.

=Limits on additional planets=

A 2016 study found that additional planets are possible in the region between the two planets thought to exist at the time, in particular planets less than 15 Earth masses orbiting between 0.25-2.0 AU. As of 2024, no additional planets had been found and Gliese 832 b remains the only known planet in the system. The radial velocity data sets an upper limit of 1.5 Earth masses on any undetected planet with a period up to 100 days.

=Search for cometary disc=

If this system has a comet disc, it is not "brighter than the fractional dust luminosity 10⁻⁵" according to a 2012 Herschel study.

Notes

{{reflist|group=note|refs=

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

}}

References

{{reflist|refs=

{{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

| doi=10.3847/1538-4357/ac0aea | arxiv=2106.07656

| bibcode=2021ApJ...918...40P | s2cid=235435757 | doi-access=free }}

B. C. Matthews; forthcoming study promised in {{Cite journal

|last1=Lestrade |first1=J.-F.

|last2=Matthews |first2=B. C.

|date=2012

|title=A DEBRIS Disk Around The Planet Hosting M-star GJ581 Spatially Resolved with Herschel

|journal=Astronomy and Astrophysics

|volume=548 |pages=A86

|arxiv=1211.4898

|bibcode=2012A&A...548A..86L

|doi=10.1051/0004-6361/201220325

|last3=Sibthorpe

|first3=B.

|last4=Kennedy

|first4=G. M.

|last5=Wyatt

|first5=M. C.

|last6=Bryden

|first6=G.

|last7=Greaves

|first7=J. S.

|last8=Thilliez

|first8=E.

|last9=Moro-Martín

|first9=A.

|last10=Booth

|first10=M.

|last11=Dent

|first11=W. R. F.

|last12=Duchêne

|first12=G.

|last13=Harvey

|first13=P. M.

|last14=Horner

|first14=J.

|last15=Kalas

|first15=P.

|last16=Kavelaars

|first16=J. J.

|last17=Phillips

|first17=N. M.

|last18=Rodriguez

|first18=D. R.

|last19=Su

|first19=K. Y. L.

|last20=Wilner

|first20=D. J.

|s2cid=53704989

}}

{{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=743–747

|arxiv=0809.0172

|bibcode=2009ApJ...690..743B

|doi=10.1088/0004-637X/690/1/743

|s2cid=17172233

}}

{{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

|first11=G. S.

|last12=O'Toole

|first12=S. J.

|last13=Wright

|first13=D.

|last14=Crane

|first14=J. D.

|last15=Schectman

|first15=S. A.

|last16=Arriagada

|first16=P.

|last17=Thompson

|first17=I.

|last18=Minniti

|first18=D.

|last19=Jenkins

|first19=J. S.

|last20=Diaz

|first20=M. |doi=10.1088/0004-637X/791/2/114

|s2cid=12157837

}}

{{ 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

}}

"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 }}

{{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=.

}}

{{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 }}

{{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=.

}}

{{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 }}

{{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 }}

{{cite journal |last1=Xiao |first1=Guang-Yao |last2=Liu |first2=Yu-Juan |display-authors=etal |date=May 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=055022 |doi=10.1088/1674-4527/accb7e |arxiv=2303.12409 |bibcode=2023RAA....23e5022X |s2cid=257663647}}

{{cite journal |last1=Philipot |first1=F. |last2=Lagrange |first2=A.-M. |display-authors=etal |date=October 2023 |title=A multi-technique approach to identifying and/or constraining radial-velocity substellar companions |journal=Astronomy & Astrophysics |volume=678 |issue= |pages=A107 |doi=10.1051/0004-6361/202346612 |arxiv=2308.05417 |bibcode=2023A&A...678A.107P}}

{{cite journal | arxiv=2409.01173 | last1=Liebing | first1=F. | last2=Jeffers | first2=S. V. | last3=Gorrini | first3=P. | last4=Haswell | first4=C. A. | last5=Dreizler | first5=S. | last6=Barnes | first6=J. R. | last7=Hartogh | first7=C. | last8=Koseleva | first8=V. | last9=Del Sordo | first9=F. | last10=Amado | first10=P. J. | last11=Caballero | first11=J. A. | last12=López-González | first12=M. J. | last13=Morales | first13=N. | last14=Reiners | first14=A. | last15=Ribas | first15=I. | last16=Quirrenbach | first16=A. | last17=Rodríguez | first17=E. | last18=Tal-Or | first18=L. | last19=Tsapras | first19=Y. | title=RedDots: Limits on habitable and undetected planets orbiting nearby stars GJ 832, GJ 674, and Ross 128 | journal=Astronomy and Astrophysics | date=2024 | volume=690 | pages=A234 | doi=10.1051/0004-6361/202347902 | bibcode=2024A&A...690A.234L }}

}}

Category:Local Bubble

Category:M-type main-sequence stars

Category:Grus (constellation)

Category:Planetary systems with one confirmed planet

Category:Astronomical X-ray sources