Triple star-system in the constellation Carina
HD 65216 is a triple[ 6] star system with twoexoplanetary companions in the southernconstellation ofCarina . With anapparent visual magnitude of 7.97[ 1] binoculars ortelescope it should be visible. The system is located at a distance of 114.7 light-years from the Sun based onparallax measurements, and is drifting further away with aradial velocity of 42.6 km/s.[ 2]
The primary of HD 65216, component A, is an ordinaryG-type main-sequence star with astellar classification of G5V.[ 5] [ 7] projected rotational velocity of 1.3 km/s.[ 8] photosphere at aneffective temperature of 5,718 K.[ 7]
In 2008 a co-moving binary system of low mass companions were discovered at anangular separation of″ projected separation ofAU M ☉ M ☉ [ 6]
Anextrasolar planet (designated asHD 65216 b ) was discovered orbiting the primary in 2003.[ 10] [ 11] [ 12]
^a b c d e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation".Astronomy Letters 38 (5): 331.arXiv :1108.4971 Bibcode :2012AstL...38..331A .doi :10.1134/S1063773712050015 . XHIP record for this object atVizieR .^a b c d e f Brown, A. G. A. ; et al. (Gaia collaboration ) (August 2018)."Gaia Data Release 2: Summary of the contents and survey properties" .Astronomy & Astrophysics 616 . A1.arXiv :1804.09365 Bibcode :2018A&A...616A...1G doi :10.1051/0004-6361/201833051 Gaia DR2 record for this source atVizieR .^a b c d 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 atVizieR .^a b c Tokovinin, Andrei (2018)."The Updated Multiple Star Catalog" .The Astrophysical Journal Supplement Series .235 (1): 6.arXiv :1712.04750 Bibcode :2018ApJS..235....6T .doi :10.3847/1538-4365/aaa1a5 ^a b Houk, Nancy (1979).Michigan catalogue of two-dimensional spectral types for the HD stars . Vol. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan.Bibcode :1978mcts.book.....H . ^a b c Mugrauer, M.; Seifahrt, A.; Neuhäuser, R. (July 2007)."The multiplicity of planet host stars - new low-mass companions to planet host stars" .Monthly Notices of the Royal Astronomical Society .378 (4):1328– 1334.arXiv :0704.1767 Bibcode :2007MNRAS.378.1328M .doi :10.1111/j.1365-2966.2007.11858.x S2CID 14227351 . ^a b c d e f g h Bonfanti, A.; et al. (2015)."Revising the ages of planet-hosting stars" .Astronomy and Astrophysics .575 . A18.arXiv :1411.4302 Bibcode :2015A&A...575A..18B doi :10.1051/0004-6361/201424951 ^a b c Costa Silva, A. R.; et al. (February 2020). "Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur".Astronomy & Astrophysics .634 : 10.arXiv :1912.08659 Bibcode :2020A&A...634A.136C .doi :10.1051/0004-6361/201936523 .S2CID 209405391 . A136. ^ "HD 65216" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2019-09-26 .^ Mayor, M.; et al. (2004)."The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE" .Astronomy and Astrophysics .415 (1):391– 402.arXiv :astro-ph/0310316 Bibcode :2004A&A...415..391M doi :10.1051/0004-6361:20034250 ^ Wittenmyer, Robert A.; et al. (2013). "Forever Alone? Testing Single Eccentric Planetary Systems for Multiple Companions".The Astrophysical Journal Supplement Series .208 (1): 2.arXiv :1307.0894 Bibcode :2013ApJS..208....2W .doi :10.1088/0067-0049/208/1/2 .S2CID 14109907 . ^a b Wittenmyer, Robert A.; et al. (2019)."Truly eccentric – I. Revisiting eight single-eccentric planetary systems" .Monthly Notices of the Royal Astronomical Society .484 (4):5859– 5867.arXiv :1901.08471 Bibcode :2019MNRAS.484.5859W .doi :10.1093/mnras/stz290
