HD 45184

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HD 45184
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Canis Major
Right ascension 06h 24m 43.87975s [1]
Declination –28° 46′ 48.4163″ [1]
Apparent magnitude  (V)6.37 [2]
Characteristics
Evolutionary stage main sequence
Spectral type G2Va [3]
Apparent magnitude  (B)6.996 [2]
Apparent magnitude  (J)5.219 [4]
Apparent magnitude  (H)4.962 [4]
Apparent magnitude  (K)4.871 [4]
B−V color index 0.626±0.007 [2]
Astrometry
Radial velocity (Rv)−3.828±0.0003 [1] km/s
Proper motion (μ)RA: −165.257 [1] mas/yr
Dec.: −121.826 [1] mas/yr
Parallax (π)45.5224±0.0320  mas [1]
Distance 71.65 ± 0.05  ly
(21.97 ± 0.02  pc)
Absolute magnitude  (MV)4.67 [2] [5]
Details
Mass 1.08±0.04 [6]   M☉
Radius 1.05±0.02 [1]   R☉
Luminosity 1.178+0.002
−0.001 [1]   L☉
Surface gravity (log g)4.47±0.02 [7]   cgs
Temperature 5,862+72
−48 [1]   K
Metallicity [Fe/H]0.070±0.016 [6]   dex
Rotation 20.0±0.1 d [6]
Rotational velocity (v sin i)2.1 [7]  km/s
Age 3.0+0.7
−1.4 [6]   Gyr
Other designations
CD–29°2981, GJ 3394, HD 45184, HIP 30503, HR 2318, SAO 171711, PPM 250356 [8]
Database references
SIMBAD data
Exoplanet Archive data

HD 45184 is a star in the southern constellation of Canis Major. It is a yellow-hued star near the lower limit of visibility to the naked eye with an apparent visual magnitude of 6.37. [2] The star is located at a distance of 71.65  light years from the Sun based on parallax. [1] It is drifting closer with a radial velocity of −3.8 km/s. [1]

This object is an ordinary G-type main-sequence star with a stellar classification of G2Va, [3] and it is considered a solar twin. [5] The mass, size, and luminosity of the star are slightly higher than for the Sun, and it has a near solar metallicity – what astronomers term the abundance of elements with higher atomic numbers than helium. The star is around three billion years old and is spinning with a 20-day period. [6] It has a 5.14 [9] -year magnetic activity cycle that has a lower amplitude than on the Sun. [7]

Planetary system

HD 45184 has a planet around 12 times as massive as Earth that takes 5.88 days to complete an orbit around its host star. This planet was detected using the radial velocity method. [10] It was later confirmed with Spitzer, whereupon a second candidate planet of similar mass was discovered orbiting with a 13.1 day period. The star was observed by Spitzer for a transit of the inner planet, but no event was detected. [11] Both Neptune-like planets have near circular orbits close to the host star. [7]

An infrared excess has been detected using the Multiband Imaging Photometer for Spitzer at a wavelength of 70 μm, making this a debris disk candidate. [12] Based upon blackbody models, it is orbiting 1.0  AU from the host star with a mean temperature of 280 K. There may be an additional, 60 K debris disk orbiting at a distance of 22.89 AU. [13]

The HD 45184 planetary system [7]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b≥12.19+1.06
−1.03  M🜨 		0.0644+0.0020
−0.0021		5.8854±0.00030.07±0.05——
c≥8.81+1.09
−1.02  M🜨 		0.1100+0.0034
−0.0036		13.1354+0.0026
−0.0025		0.07+0.07
−0.05		——

References

  1. 1 2 3 4 5 6 7 8 9 10 11 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. 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 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373. S2CID   123149047.
  4. 1 2 3 Cutri, R. M.; et al. (June 2003). 2MASS All Sky Catalog of point sources. NASA/IPAC. Bibcode:2003tmc..book.....C.
  5. 1 2 Datson, Juliet; et al. (March 2014). "Solar analogues and solar twins in the HARPS archive". Monthly Notices of the Royal Astronomical Society. 439 (1): 1028–1037. arXiv: 1401.1316 . Bibcode:2014MNRAS.439.1028D. doi: 10.1093/mnras/stu026 .
  6. 1 2 3 4 5 Lorenzo-Oliveira, Diego; et al. (May 2019). "Constraining the evolution of stellar rotation using solar twins". Monthly Notices of the Royal Astronomical Society: Letters. 485 (1): L68 –L72. arXiv: 1903.02630 . Bibcode:2019MNRAS.485L..68L. doi: 10.1093/mnrasl/slz034 .
  7. 1 2 3 4 5 Udry, S.; et al. (February 2019). "The HARPS search for southern extra-solar planets. XLIV. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions". Astronomy & Astrophysics. 622: 29. arXiv: 1705.05153 . Bibcode:2019A&A...622A..37U. doi:10.1051/0004-6361/201731173. S2CID   119095511. A37.
  8. ↑ "HD 45184". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-01-02.
  9. ↑ Flores, M.; et al. (May 2016). "Discovery of an activity cycle in the solar analog HD 45184. Exploring Balmer and metallic lines as activity proxy candidates". Astronomy & Astrophysics. 589: 6. arXiv: 1604.01307 . Bibcode:2016A&A...589A.135F. doi:10.1051/0004-6361/201628145. S2CID   119280028. A135.
  10. ↑ Mayor, M.; et al. (2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv: 1109.2497 .
  11. ↑ Gillon, M.; et al. (2017). "The Spitzer search for the transits of HARPS low-mass planets. II. Null results for 19 planets". Astronomy and Astrophysics. 601. A117. arXiv: 1701.01303 . Bibcode:2017A&A...601A.117G. doi:10.1051/0004-6361/201629270. S2CID   86862862.
  12. ↑ Koerner, D. W.; et al. (February 2010). "New Debris Disk Candidates Around 49 Nearby Stars" (PDF). The Astrophysical Journal Letters. 710 (1): L26 –L29. Bibcode:2010ApJ...710L..26K. doi: 10.1088/2041-8205/710/1/L26 .
  13. ↑ Cotten, Tara H.; Song, Inseok (July 2016). "A Comprehensive Census of Nearby Infrared Excess Stars". The Astrophysical Journal Supplement Series. 225 (1): 24. arXiv: 1606.01134 . Bibcode:2016ApJS..225...15C. doi: 10.3847/0067-0049/225/1/15 . S2CID   118438871. 15.
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