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HD 65216

Coordinates: Sky map 07h 53m 41.3223s, −63° 38′ 50.363″
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HD 65216
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 07h 53m 41.3193s[1]
Declination −63° 38′ 50.353″[1]
Apparent magnitude (V) 7.97[2]
Characteristics
Spectral type G5V[3] + M7–8 + L2–3[4]
B−V color index 0.672±0.012[2]
Astrometry
Radial velocity (Rv)42.57±0.16[1] km/s
Proper motion (μ) RA: −123.633±0.065 mas/yr[1]
Dec.: 146.578±0.073 mas/yr[1]
Parallax (π)28.4445 ± 0.0317 mas[1]
Distance114.7 ± 0.1 ly
(35.16 ± 0.04 pc)
Absolute magnitude (MV)5.22[2]
Details
HD 65216 A
Mass0.95±0.01[5] M☉
Radius0.864±0.003[5] R☉
Luminosity0.716±0.001[5] L☉
Surface gravity (log g)4.53±0.01[5] cgs
Temperature5,718±8[5] K
Metallicity [Fe/H]−0.17[6] dex
Rotational velocity (v sin i)1.308[6] km/s
Age1.7±0.5[5] Gyr
Other designations
CD−63°359, HD 65216, HIP 38558, SAO 250002, WDS J07537-6339A[7]
Database references
SIMBADdata

HD 65216 is a triple[4] star system with two exoplanetary companions in the southern constellation of Carina. With an apparent visual magnitude of 7.97[2] 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.[1]

The primary, component A, is an ordinary G-type main-sequence star with a stellar classification of G5V.[3] It is nearly two billion years old[5] and is spinning with a projected rotational velocity of 1.3 km/s.[6] 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.[5]

In 2008 a co-moving binary system of low mass companions were discovered at an angular separation of 7″ from the primary, which is equivalent to a projected separation of 253 AU at the distance of HD 65216. Component B is of class M7–8 (0.089 M☉) while component C is class L2–3 (0.078 M☉); both have a mass close to the sub-stellar limit. The pair have a projected separation of 6 AU from each other.[4]

Planetary system

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An extrasolar planet (designated as HD 65216 b) was discovered orbiting the primary in 2003.[8] A second much more distant planet was suspected since 2013,[9] but was discovered on a completely different orbit in 2019.[10]

The HD 65216 planetary system[10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥1.295±0.062 MJ 1.301±0.020 577.6±1.328 0.27±0.02 — —
c ≥2.03±0.11 MJ 5.75±0.09 5370±20 0.17±0.04 — —

See also

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References

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  1. ^ 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 at VizieR.
  2. ^ a b c d 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. S2CID 119257644.
  3. ^ 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.
  4. ^ 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.
  5. ^ 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.
  6. ^ 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.
  7. ^ "HD 65216". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-26.
  8. ^ 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.
  9. ^ 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.
  10. ^ 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.
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