HD 70642

Last updated
HD 70642
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Puppis
Right ascension 08h 21m 28.13685s [1]
Declination −39° 42′ 19.4843″ [1]
Apparent magnitude  (V)+7.17 [2]
Characteristics
Spectral type G6V CN+0.5 [3]
B−V color index 0.692±0.022 [2]
Astrometry
Radial velocity (Rv)+49.31±0.12 [1]  km/s
Proper motion (μ)RA: −201.729  mas/yr [1]
Dec.: 225.102  mas/yr [1]
Parallax (π)34.1478 ± 0.0154  mas [1]
Distance 95.51 ± 0.04  ly
(29.28 ± 0.01  pc)
Absolute magnitude  (MV)+4.93 [2]
Details
Mass 1.04±0.02 [4]   M☉
Radius 0.97±0.01 [4]   R☉
Luminosity 0.917±0.004 [4]   L☉
Surface gravity (log g)4.47±0.02 [4]   cgs
Temperature 5732±23 [4]   K
Metallicity [Fe/H]+0.17±0.04 [5]   dex
Rotational velocity (v sin i)1.57 [6]  km/s
Age 1.9±1.1 Gyr [4]
3.8±2.6 [6]   Gyr
Other designations
CD−39°4247, GJ  304, HD  70642, HIP  40952, SAO  199126, LTT  3116 [7]
Database references
SIMBAD data
Exoplanet Archive data
ARICNS data
Extrasolar Planets
Encyclopaedia 		data

HD 70642 is a star with an exoplanetary companion in the southern constellation of Puppis. It has an apparent visual magnitude of +7.17, [2] which is too dim to be readily visible to the naked eye. The system is located at a distance of 95.5 light-years (29.3 parsecs ) from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +49.3 km/s. [1] It came to within 55.3 ly of the Solar System some 329,000 years ago. [2]

Contents

This may be considered to be a solar analog star, being similar in physical properties to the Sun. [5] It is a G-type main-sequence star with a stellar classification of G6V CN+0.5. [3] It is comparable to the age of the Sun, estimated to be in the range of 2–6 billion years old. Although chromospherically inactive a magnetic field has been detected. [5] This star has about the same mass and radius as the Sun, is slightly cooler and less luminous, [4] and is richer in abundance of iron relative to hydrogen. [5] It is spinning at a leisurely rate, showing a projected rotational velocity of 1.6 km/s. [6]

Planetary system

A long period planetary companion to HD 70642 was announced in 2003. This planet orbits in a circular orbit (e=0.034) at 3.232 AU. [8] The star is so like Sol that its habitable zone is in the same place (~ 1 AU). The jovian ensures the stability of an Earth-mass planet at 1 AU. This system is one of the most similar in conditions to the Solar System among currently known planetary systems. [9] In 2023, the inclination and true mass of HD 70642 b were determined via astrometry. [10]

The HD 70642 planetary system [10]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(years)		 Eccentricity Inclination Radius
b 3.9+0.29
−0.27  MJ 		3.295±0.0215.751+0.038
−0.035		0.04+0.034
−0.027		29.9+2.6
−2.4 or 150.1+2.4
−2.6 ° 		—

See also

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References

  1. 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics . arXiv: 2208.00211 . doi: 10.1051/0004-6361/202243940 . Gaia DR3 record for this source at VizieR.
  2. 1 2 3 4 5 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. 1 2 Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal . 132 (1): 161–170. arXiv: astro-ph/0603770 . Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID   119476992.
  4. 1 2 3 4 5 6 7 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 .
  5. 1 2 3 4 Fossati, L.; et al. (March 2013). "Detection of a magnetic field in three old and inactive solar-like planet-hosting stars". Astronomy & Astrophysics. 551: 4. arXiv: 1302.0879 . Bibcode:2013A&A...551A..85F. doi:10.1051/0004-6361/201220997. S2CID   53377473. A85.
  6. 1 2 3 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 70642". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-09-04.
  8. ↑ Carter, Brad D.; et al. (2003). "A Planet in a Circular Orbit with a 6 Year Period". The Astrophysical Journal Letters. 593 (1): L43–L46. arXiv: astro-ph/0307066 . Bibcode: 2003ApJ...593L..43C . doi: 10.1086/378185 .
  9. ↑ Hinse, T. C.; et al. (2008). "Dynamics and stability of telluric planets within the habitable zone of extrasolar planetary systems - Numerical simulations of test particles within the HD 4208 and HD 70642 systems". Astronomy & Astrophysics. 488 (3): 1133–1147. Bibcode:2008A&A...488.1133H. doi: 10.1051/0004-6361:200809822 .
  10. 1 2 Xiao, Guang-Yao; Liu, Yu-Juan; et al. (May 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics . 23 (5): 055022. arXiv: 2303.12409 . Bibcode:2023RAA....23e5022X. doi:10.1088/1674-4527/accb7e.

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