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{{Short description|Star in the constellation Fornax}} {{Short description|Star in a binary star system in the constellation Fornax}}
{{Starbox begin {{Starbox begin
| name = ] 20781 | name = ] 20781
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| epoch = J2000.0 | epoch = J2000.0
| constell = ]<ref name="Roman1987"/> | constell = ]<ref name="Roman1987"/>
| ra = {{RA|03|20|02.943}}<ref name="van Leeuwen2007"/> | ra = {{RA|03|20|02.94286}}<ref name="GaiaDR3"/>
| dec = {{DEC|–28|47|01.80}}<ref name="van Leeuwen2007"/> | dec = {{DEC|-28|47|01.7905}}<ref name="GaiaDR3"/>
| appmag_v = 8.48 | appmag_v = 8.48<ref name=Udry2017/>
}} }}
{{Starbox character {{Starbox character
| class = K0V<ref name=Udry2017/> | class = K0V<ref name=Udry2017/>
| variable = | variable =
| b-v = 0.82 | b-v = 0.82<ref name=Udry2017/>
}} }}
{{Starbox astrometry {{Starbox astrometry
| radial_v = | radial_v = {{val|40.27|0.12}}<ref name="GaiaDR3"/>
| prop_mo_ra = 348.97 ± 0.71<ref name="van Leeuwen2007"/> | prop_mo_ra = {{val|348.869|0.015}}
| prop_mo_dec = –67.69 ± 0.91<ref name="van Leeuwen2007"/> | prop_mo_dec = {{val|-66.614|0.019}}
| pm_footnote = <ref name="GaiaDR3"/>
| parallax = 28.27
| p_error = 1.08 | parallax = 27.8123
| p_error = 0.0239
| parallax_footnote = <ref name="van Leeuwen2007"/> | parallax_footnote = <ref name="GaiaDR3"/>
| absmag_v =
| absmag_v = 5.70<ref name=Udry2017/>
}} }}
{{Starbox detail {{Starbox detail
| source = <ref name=Udry2017/>
⚫ | source =<ref name=Udry2017>{{citation|arxiv=1705.05153|title=The HARPS search for southern extra-solar planets. XLII. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions|year=2019|doi=10.1051/0004-6361/201731173|last1=Udry|first1=S.|last2=Dumusque|first2=X.|last3=Lovis|first3=C.|last4=Segransan|first4=D.|last5=Diaz|first5=R. F.|last6=Benz|first6=W.|last7=Bouchy|first7=F.|last8=Coffinet|first8=A.|last9=Lo Curto|first9=G.|last10=Mayor|first10=M.|last11=Mordasini|first11=C.|last12=Motalebi|first12=F.|last13=Pepe|first13=F.|last14=Queloz|first14=D.|last15=Santos|first15=N. C.|last16=Wyttenbach|first16=A.|last17=Alonso|first17=R.|last18=Collier Cameron|first18=A.|last19=Deleuil|first19=M.|last20=Figueira|first20=P.|last21=Gillon|first21=M.|last22=Moutou|first22=C.|last23=Pollacco|first23=D.|last24=Pompei|first24=E.|journal=Astronomy & Astrophysics|volume=A37|page=622|s2cid=119095511}}</ref>
| mass = 0.7 | mass = 0.7
| radius = | radius =
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{{Starbox end}} {{Starbox end}}


'''HD 20781''' is a star which is part of a wide ] with ]. The companion star has a very large ] of 252 arcsec, corresponding to 9080 AU at the distance of HD 20782.<ref name=Desidera></ref> Both stars possess their own ]s in ]s. This is the first time that ] in both components of a wide binary system.<ref name=Desidera/><ref>{{cite arXiv|eprint=1109.2497|class=astro-ph|title=The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets|author=Mayor, M. Marmier,M. Lovis,C. Udry,S. Ségransan,D. Pepe,F. Benz,W. Bertaux,J.-L. Bouchy,F. Dumusque, G. Curto,Lo Mordasini,C. Queloz,D. Santos,N. C.|date=2011|display-authors=etal}}</ref> '''HD 20781''' is a star which is part of a wide ] with ]. The companion star has a very large ] of 252 arcsec, corresponding to 9080 AU at the distance of HD 20782.<ref name=Desidera/> Both stars possess their own ]s in ]s, with a total of five known planets around both stars.<ref name=Udry2017/><ref name="NASAExoplanetArchive"/> This is the first known example of ] orbiting both components of a wide binary system.<ref name=Desidera/><ref name=Mayor2011/> HD 20781 has no noticeable ] activity.<ref name=Udry2017/>

'''HD 20781''' has no noticeable ] activity.<ref name=Udry2017/>
== Planetary system == == Planetary system ==
In 2011, a pair of Neptune-sized gas giants were detected with the radial velocity method. In 2017, an additional two inner ] were suspected, with periods of 5.3 and 13.9 days respectively.<ref name=Udry2017/> In 2011, a pair of Neptune-mass gas giants were detected with the radial velocity method.<ref name=Mayor2011/> In 2017, these planets were confirmed and an additional two inner ] were detected, with periods of 5.3 and 13.9 days respectively.<ref name=Udry2017/>
{{OrbitboxPlanet begin {{OrbitboxPlanet begin
| table_ref=<ref name=Udry2017/> | table_ref=<ref name=Udry2017/>
}} }}
{{OrbitboxPlanet hypothetical {{OrbitboxPlanet
| exoplanet = d | exoplanet = ]
| mass_earth = ≥{{val|1.93|0.39|0.36}} | mass_earth = {{val|1.93|0.39|0.36|p=≥}}
| period = 5.3135{{±|0.0010}} | period = {{val|5.3135|0.0010}}
| semimajor = {{val|0.0529|0.0024|0.0027}} | semimajor = {{val|0.0529|0.0024|0.0027}}
| eccentricity = {{val|0.10|0.11|0.07}} | eccentricity = {{val|0.10|0.11|0.07}}
}} }}
{{OrbitboxPlanet hypothetical {{OrbitboxPlanet
| exoplanet = e | exoplanet = ]
| mass_earth = ≥{{val|5.33|0.70|0.67}} | mass_earth = {{val|5.33|0.70|0.67|p=≥}}
| period = {{val|13.8905|0.0033|0.0034}} | period = {{val|13.8905|0.0033|0.0034}}
| semimajor = {{val|0.1004|0.0046|0.0051}} | semimajor = {{val|0.1004|0.0046|0.0051}}
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}} }}
{{OrbitboxPlanet {{OrbitboxPlanet
| exoplanet = ] | exoplanet = ]
| mass_earth = ≥{{val|10.61|1.20|1.19}} | mass_earth = {{val|10.61|1.20|1.19|p=≥}}
| period = {{val|29.1580|0.0102|0.0100}} | period = {{val|29.1580|0.0102|0.0100}}
| semimajor = {{val|0.1647|0.0076|0.0083}} | semimajor = {{val|0.1647|0.0076|0.0083}}
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}} }}
{{OrbitboxPlanet {{OrbitboxPlanet
| exoplanet = ] | exoplanet = ]
| mass_earth = ≥14.03{{±|1.56}} | mass_earth = {{val|14.03|1.56|p=≥}}
| period = {{val|85.5073|0.0983|0.0947}} | period = {{val|85.5073|0.0983|0.0947}}
| semimajor = {{val|0.3374|0.0155|0.0170}} | semimajor = {{val|0.3374|0.0155|0.0170}}
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== See also == == See also ==
* ] * ]
* ], a wide binary star in the constellation Lynx * ], a wide binary star in the constellation Lynx


==References== ==References==
{{Reflist|refs= {{Reflist|refs=


<ref name="GaiaDR3">{{Cite Gaia DR3|5060105897197110144}}</ref>
⚫ <ref name="Roman1987">{{cite journal | title=Identification of a Constellation From a Position | url=http://articles.adsabs.harvard.edu/full/1987PASP...99..695R | last1=Roman | first1=Nancy G. | journal=Publications of the Astronomical Society of the Pacific | volume=99 | issue=617 | pages=695–699 | date=1987 | bibcode=1987PASP...99..695R | doi=10.1086/132034 | doi-access=free }} </ref>

⚫ <ref name="Roman1987">{{cite journal | title=Identification of a Constellation From a Position | last1=Roman | first1=Nancy G. | journal=Publications of the Astronomical Society of the Pacific | volume=99 | issue=617 | pages=695–699 | date=1987 | bibcode=1987PASP...99..695R | doi=10.1086/132034 | doi-access=free }} </ref>


<ref name="SIMBAD">{{cite web | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+20781 | title=HD 20781 -- High proper-motion Star | website=] Astronomical Database | publisher=] | access-date=2014-09-10}}</ref> <ref name="SIMBAD">{{cite web | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+20781 | title=HD 20781 -- High proper-motion Star | website=] Astronomical Database | publisher=] | access-date=2014-09-10}}</ref>


<ref name="NASAExoplanetArchive">{{cite web |title=HD 20782 |url=https://exoplanetarchive.ipac.caltech.edu/overview/HD%2020781 |website=] |access-date=12 November 2022}}</ref>
<ref name="van Leeuwen2007">{{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | s2cid=18759600 }}</ref>

<ref name=Desidera>{{cite journal |last1=Desidera |first1=S. |last2=Barbieri |first2=M. |date=January 2007 |title=Properties of planets in binary systems. The role of binary separation |journal=] |volume=462 |issue=1 |pages=345–353 |doi=10.1051/0004-6361:20066319 |arxiv=astro-ph/0610623 |bibcode=2007A&A...462..345D|s2cid=13813761 }}</ref>

<ref name=Mayor2011>{{cite arXiv |eprint=1109.2497 |class=astro-ph |title=The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets |last1=Mayor |first1=M. |last2=Marmier |first2=M. |last3=Lovis |first3=C. |last4=Udry |first4=S. |last5=Ségransan |first5=D. |last6=Pepe |first6=F. |last7=Benz |first7=W. |last8=Bertaux |first8=J.-L. |last9=Bouchy |first9=F. |last10=Dumusque |first10=X. |last11=Lo Curto |first11=G. |last12=Mordasini |first12=C. |last13=Queloz |first13=D. |last14=Santos |first14=N. C. |date=2011 |display-authors=2}}</ref>

⚫ <ref name=Udry2017>{{cite journal |arxiv=1705.05153 |title=The HARPS search for southern extra-solar planets. XLIV. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions |date=February 2019 |doi=10.1051/0004-6361/201731173 |last1=Udry |first1=S. |last2=Dumusque |first2=X. |last3=Lovis |first3=C. |last4=Segransan |first4=D. |last5=Diaz |first5=R. F. |last6=Benz |first6=W. |last7=Bouchy |first7=F. |last8=Coffinet |first8=A. |last9=Lo Curto |first9=G. |last10=Mayor |first10=M. |last11=Mordasini |first11=C. |last12=Motalebi |first12=F. |last13=Pepe |first13=F. |last14=Queloz |first14=D. |last15=Santos |first15=N. C. |last16=Wyttenbach |first16=A. |last17=Alonso |first17=R. |last18=Collier Cameron |first18=A. |last19=Deleuil |first19=M. |last20=Figueira |first20=P. |last21=Gillon |first21=M. |last22=Moutou |first22=C. |last23=Pollacco |first23=D. |last24=Pompei |first24=E. |display-authors=2 |journal=] |volume=622 |page=A37 |bibcode=2019A&A...622A..37U |s2cid=119095511}}</ref>


}} }}


== External links == == External links ==
* {{cite encyclopedia | url=http://exoplanet.eu/catalog/hd_20781_c/| title=Planet HD 20781 c| encyclopedia=] |access-date=18 September 2020}} * {{cite encyclopedia | url=https://exoplanet.eu/catalog/hd_20781_c--946/| encyclopedia=]| title=Planet HD 20781 c|access-date=18 September 2020}}
* {{cite encyclopedia | url=http://exoplanet.eu/catalog/hd_20781_b/| title=Planet HD 20781 b| encyclopedia=] |access-date=18 September 2020}} * {{cite encyclopedia | url=https://exoplanet.eu/catalog/hd_20781_b--945/| encyclopedia=]| title=Planet HD 20781 b|access-date=18 September 2020}}
{{HD20781HD20782}} {{HD20781HD20782}}


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{{DEFAULTSORT:HD 20781}} {{DEFAULTSORT:HD 20781}}
] ]
] ]
] ]
] ]
] ]
] ]
] ]

Latest revision as of 06:22, 22 December 2023

Star in a binary star system in the constellation Fornax
HD 20781
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Fornax
Right ascension 03 20 02.94286
Declination −28° 47′ 01.7905″
Apparent magnitude (V) 8.48
Characteristics
Spectral type K0V
B−V color index 0.82
Astrometry
Radial velocity (Rv)40.27±0.12 km/s
Proper motion (μ) RA: 348.869±0.015 mas/yr
Dec.: −66.614±0.019 mas/yr
Parallax (π)27.8123 ± 0.0239 mas
Distance117.3 ± 0.1 ly
(35.96 ± 0.03 pc)
Absolute magnitude (MV)5.70
Details
Mass0.7 M☉
Luminosity0.49±0.04 L☉
Surface gravity (log g)4.37±0.05 cgs
Temperature5256±29 K
Metallicity −0.11±0.02 dex
Rotation46.8±4.4 d
Rotational velocity (v sin i)1.1 km/s
Other designations
CD–29° 1229, HIP 15526, LTT 1581, SAO 168468, 2MASS J03200291-2847016, Gaia DR1 5060105892897388288
Database references
SIMBADdata

HD 20781 is a star which is part of a wide binary system with HD 20782. The companion star has a very large angular separation of 252 arcsec, corresponding to 9080 AU at the distance of HD 20782. Both stars possess their own planetary systems in S type orbits, with a total of five known planets around both stars. This is the first known example of planets being found orbiting both components of a wide binary system. HD 20781 has no noticeable starspot activity.

Planetary system

In 2011, a pair of Neptune-mass gas giants were detected with the radial velocity method. In 2017, these planets were confirmed and an additional two inner super-Earths were detected, with periods of 5.3 and 13.9 days respectively.

The HD 20781 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥1.93+0.39
−0.36 M🜨 		0.0529+0.0024
−0.0027 		5.3135±0.0010 0.10+0.11
−0.07 		— —
c ≥5.33+0.70
−0.67 M🜨 		0.1004+0.0046
−0.0051 		13.8905+0.0033
−0.0034 		0.09+0.09
−0.06 		— —
d ≥10.61+1.20
−1.19 M🜨 		0.1647+0.0076
−0.0083 		29.1580+0.0102
−0.0100 		0.11+0.05
−0.06 		— —
e ≥14.03±1.56 M🜨 0.3374+0.0155
−0.0170 		85.5073+0.0983
−0.0947 		0.06+0.06
−0.04 		— —

See also

References

  1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
  2. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ Udry, S.; Dumusque, X.; et al. (February 2019). "The HARPS search for southern extra-solar planets. XLIV. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions". Astronomy & Astrophysics. 622: A37. arXiv:1705.05153. Bibcode:2019A&A...622A..37U. doi:10.1051/0004-6361/201731173. S2CID 119095511.
  4. "HD 20781 -- High proper-motion Star". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2014-09-10.
  5. ^ Desidera, S.; Barbieri, M. (January 2007). "Properties of planets in binary systems. The role of binary separation". Astronomy and Astrophysics. 462 (1): 345–353. arXiv:astro-ph/0610623. Bibcode:2007A&A...462..345D. doi:10.1051/0004-6361:20066319. S2CID 13813761.
  6. "HD 20782". NASA Exoplanet Archive. Retrieved 12 November 2022.
  7. ^ Mayor, M.; Marmier, M.; et al. (2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv:1109.2497 .

External links

The HD 20781/HD 20782 system
HD 20781
  • HD 20782
  • b


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