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'''HD 20781''' is a star which is part of a wide binary system with ]. Both stars possess their own planetary systems in S type orbits. This is the first time that planets have been found in both components of a wide binary system.<ref>http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...462..345DFUL</ref><ref>{{cite news|title=Notes for star HD 20781 |cite web|url=http://exoplanet.eu/star.php?st=HD+20781|author=Schneider, J|work=The Extrasolar Planets Encyclopaedia|accessdate=2011-09-12}}</ref><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. ''et al.''|year=2011}}</ref> |
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'''HD 20781''' is a star which is part of a wide binary system with ]. Both stars possess their own planetary systems in S type orbits. This is the first time that planets have been found in both components of a wide binary system.<ref>http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...462..345DFUL</ref><ref>{{cite news|title=Notes for star HD 20781 |cite web|url=http://exoplanet.eu/star.php?st=HD+20781|author=Schneider, J|work=The Extrasolar Planets Encyclopaedia|accessdate=2011-09-12}}</ref><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. ''et al.''|date=2011}}</ref> |
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== Planetary system == |
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== Planetary system == |
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<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 | year=1987 | bibcode=1987PASP...99..695R | doi=10.1086/132034 }} </ref> |
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<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 }} </ref> |
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<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=] | accessdate=2014-09-10}}</ref> |
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<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=] | accessdate=2014-09-10}}</ref> |
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<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 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }}</ref> |
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<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 }}</ref> |
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== External links == |
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== External links == |
Category