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HD 65216#Planetary system

{{Short description|Triple star-system in the constellation Carina}}

{{Starbox begin}}

{{Starbox observe

| epoch = J2000.0

| constell = Carina

| ra = {{RA|07|53|41.3193}}

| dec = {{DEC|−63|38|50.353}}

| appmag_v = 7.97

}}

{{Starbox character

| type =

| class = {{nowrap|G5V + M7–8 + L2–3}}

| r-i =

| v-r =

| b-v = 0.672{{±|0.012}}

| v-i = 0.73{{±|0.01}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = 42.57{{±|0.16}}

| prop_mo_ra = −123.633{{±|0.065}}

| prop_mo_dec = 146.578{{±|0.073}}

| pm_footnote =

| parallax = 28.4445

| p_error = 0.0317

| parallax_footnote =

| absmag_v = 5.22

}}

{{Starbox detail

| component1 = HD 65216 A

| mass = 0.95{{±|0.01}}

| radius = 0.864{{±|0.003}}

| luminosity = 0.716{{±|0.001}}

| gravity = 4.53{{±|0.01}}

| temperature = 5,718{{±|8}}

| metal_fe = −0.17

| rotation =

| rotational_velocity = 1.308

| age_gyr = 1.7{{±|0.5}}

}}

{{Starbox catalog

| names = {{odlist | CD=−63°359 | HD=65216 | HIP=38558 | SAO=250002 | WDS=J07537-6339A }}

}}

{{Starbox reference

| Simbad = HD+65216

}}

{{Starbox end}}

HD 65216 is a triple star system with two exoplanetary companions in the southern constellation of Carina. With an apparent visual magnitude of 7.97 it cannot be readily seen without technical aid, but with binoculars or telescope it should be visible. The system is located at a distance of 114.7 light-years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 42.6 km/s.

The primary, component A, is an ordinary G-type main-sequence star with a stellar classification of G5V. It is nearly two billion years old and is spinning with a projected rotational velocity of 1.3 km/s. The star has 95% of the mass and 86% of the radius of the Sun. It is radiating 72% of the luminosity of the Sun from its photosphere at an effective temperature of 5,718 K.

In 2008 a co-moving binary system of low mass companions were discovered at an angular separation of {{val|7|ul=arcsecond}} from the primary, which is equivalent to a projected separation of {{val|253|ul=AU}} at the distance of HD 65216. Component B is of class M7–8 ({{val|0.089|ul=Solar mass}}) while component C is class L2–3 ({{val|0.078|u=Solar mass}}); both have a mass close to the sub-stellar limit. The pair have a projected separation of {{val|6|u=AU}} from each other.

Planetary system

An extrasolar planet (designated as HD 65216 b) was discovered orbiting the primary in 2003. A second much more distant planet was suspected since 2013, but was discovered on a completely different orbit in 2019.

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|1.295|0.062|p=≥}}

| semimajor = {{val|1.301|0.020}}

| period = {{val|577.6|1.328}}

| eccentricity = {{val|0.27|0.02}}

}}

{{OrbitboxPlanet

| exoplanet = c

| mass = {{val|2.03|0.11|p=≥}}

| semimajor = {{val|5.75|0.09}}

| period = {{val|5370|20}}

| eccentricity = {{val|0.17|0.04}}

}}

{{Orbitbox end}}

See also

References

{{Reflist|refs=

{{cite journal

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| title=XHIP: An extended hipparcos compilation

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | arxiv=1108.4971

| doi=10.1134/S1063773712050015 | s2cid=119257644 }}

{{cite journal

| title=Revising the ages of planet-hosting stars

| url=https://www.aanda.org/articles/aa/full_html/2015/03/aa24951-14/aa24951-14.html

| last1=Bonfanti | first1=A. | last2=Ortolani | first2=S.

| last3=Piotto | first3=G. | last4=Nascimbeni | first4=V.

| display-authors=1 | journal=Astronomy and Astrophysics

| volume=575 | at=A18 | year=2015

| arxiv=1411.4302 | bibcode=2015A&A...575A..18B | bibcode-access=free

| doi=10.1051/0004-6361/201424951 | doi-access=free }}

{{Cite Gaia DR2|5287961677550103424}}

{{cite journal

| url=https://www.aanda.org/articles/aa/full/2004/07/aa0250/aa0250.html

| title=The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE

| last1=Mayor | first1=M. | last2=Udry | first2=S.

| last3=Naef | first3=D. | last4=Pepe | first4=F.

| last5=Queloz | first5=D. | last6=Santos | first6=N. C.

| last7=Burnet | first7=M. | display-authors=1

| journal=Astronomy and Astrophysics

| volume=415 | issue=1 | pages=391–402 | year=2004

| arxiv=astro-ph/0310316 | bibcode=2004A&A...415..391M | bibcode-access=free

| doi=10.1051/0004-6361:20034250 | doi-access=free }}

{{cite simbad | title=HD 65216 | access-date=2019-09-26 }}

{{cite journal

| title=Truly eccentric – I. Revisiting eight single-eccentric planetary systems

| last1=Wittenmyer | first1=Robert A. | last2=Clark | first2=Jake T.

| last3=Zhao | first3=Jinglin | last4=Horner | first4=Jonathan

| last5=Wang | first5=Songhu | last6=Johns | first6=Daniel

| display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society

| volume=484 | issue=4 | pages=5859–5867 | year=2019

| arxiv=1901.08471 | bibcode=2019MNRAS.484.5859W

| doi=10.1093/mnras/stz290 | doi-access=free }}

{{cite journal

| title=Forever Alone? Testing Single Eccentric Planetary Systems for Multiple Companions

| last1=Wittenmyer | first1=Robert A. | last2=Wang | first2=Songhu

| last3=Horner | first3=Jonathan | last4=Tinney | first4=C. G.

| last5=Butler | first5=R. P. | last6=Jones | first6=H. R. A.

| last7=O'Toole | first7=S. J. | last8=Bailey | first8=J.

| last9=Carter | first9=B. D. | last10=Salter | first10=G. S.

| last11=Wright | first11=D. | last12=Zhou | first12=Ji-Lin

| display-authors=1 | journal=The Astrophysical Journal Supplement Series

| volume=208 | issue=1 | page=2 | year=2013

| doi=10.1088/0067-0049/208/1/2 | arxiv=1307.0894

| bibcode=2013ApJS..208....2W | s2cid=14109907 }}

{{cite book

| title=Michigan catalogue of two-dimensional spectral types for the HD stars

| last=Houk |first=Nancy

| location=Ann Arbor, Michigan

| publisher=Department of Astronomy, University of Michigan

| volume=1 | year=1979

| bibcode=1978mcts.book.....H }}

{{cite journal

| title=Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur

| display-authors=1 | last1=Costa Silva | first1=A. R.

| last2=Delgado Mena | first2=E. | last3=Tsantaki | first3=M.

| journal=Astronomy & Astrophysics

| volume=634 | id=A136 | pages=10 | date=February 2020

| doi=10.1051/0004-6361/201936523 | arxiv=1912.08659

| bibcode=2020A&A...634A.136C | s2cid=209405391 }}

{{cite journal

| title=The multiplicity of planet host stars - new low-mass companions to planet host stars

| last1=Mugrauer | first1=M. | last2=Seifahrt | first2=A. | last3=Neuhäuser | first3=R.

| journal=Monthly Notices of the Royal Astronomical Society

| volume=378 | issue=4 | pages=1328–1334 | date=July 2007

| doi=10.1111/j.1365-2966.2007.11858.x | doi-access=free | arxiv=0704.1767

| bibcode=2007MNRAS.378.1328M | s2cid=14227351 }}

}}

External links

  • {{cite encyclopedia

| url=http://exoplanet.eu/star.php?st=HD+65216

| archive-url=https://web.archive.org/web/20070702190431/http://exoplanet.eu/star.php?st=HD+65216

| url-status=dead

| archive-date=July 2, 2007

| encyclopedia=Extrasolar Planets Encyclopaedia

| title=Notes for star HD 65216

| access-date=2008-08-22}}

{{Sky|07|53|41.3223|-|63|38|50.363|116}}

{{Stars of Carina}}

{{DEFAULTSORT:HD 65216}}

Category:G-type main-sequence stars

Category:M-type main-sequence stars

Category:Triple stars

Category:Planetary systems with two confirmed planets

Category:Carina (constellation)

Category:Durchmusterung objects

065216

038558