HD 47536

HD 47536 is a single[8] star in the southern constellation of Canis Major. It has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.25.[2] The star is located at a distance of approximately 401 light years from the Sun based on parallax. It is drifting further away with a radial velocity of 80 km/s.[1]

HD 47536

Sky area of 10 x 10 square arcmin around the 6th-magnitude giant star HD 47536.
Reproduced from the Digital Sky Survey.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major
Right ascension 06h 37m 47.61830s[1]
Declination −32° 20′ 23.0335″[1]
Apparent magnitude (V) +5.25[2]
Characteristics
Evolutionary stage giant[3]
Spectral type K1 III[4]
B−V color index +1.177±0.002[2]
Astrometry
Radial velocity (Rv)79.71±0.14[1] km/s
Proper motion (μ) RA: 107.609[1] mas/yr
Dec.: 64.667[1] mas/yr
Parallax (π)8.1335 ± 0.0861[1] mas
Distance401 ± 4 ly
(123 ± 1 pc)
Absolute magnitude (MV)−0.17±0.15[5]
Details[5]
Mass0.94±0.06 M☉
Radius23.08+0.68
−0.81[1] R☉
Luminosity177.2±2.3[1] L☉
Surface gravity (log g)1.72±0.08 cgs
Temperature4,384+79
−64[1] K
Metallicity [Fe/H]−0.68 dex
Rotation625 days[6]
Rotational velocity (v sin i)1.93±0.50[3] km/s
Age9.33±1.88 Gyr
Other designations
CD–32°3216, HD 47536, HIP 31688, HR 2447, SAO 197019, GSC 07091-01257[7]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

This is an aging, metal-poor giant star with a stellar classification of K1 III.[4] It is about 9.3 billion years old with 94% of the mass of the Sun. Having exhausted the supply of hydrogen at its core, the star cooled and expanded to 23 times the Sun's radius.[1] The star is spinning slowly, taking 1.71 years to complete its sidereal rotation. It is radiating 177[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,384 K.[1] As of 2007, at least one planet is known to orbit this star.[9]

Planetary system

Setiawan discovered both planets around the star: HD 47536 b in 2003[10][3] and HD 47536 c in 2007. However, the existence of this second planet is disputed.[9]

The HD 47536 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥4.0±0.4[9] MJ 1.12±0.005[9] 434.9±2.6[9] 0.3±0.1[9] — —
c (unconfirmed) >6.98 MJ 3.72 2500 — — —

See also

References
  1. 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. 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. Setiawan, J.; et al. (2003). "Evidence of a sub-stellar companion around HD 47536". Astronomy and Astrophysics. 398 (2): L19–L23. Bibcode:2003A&A...398L..19S. doi:10.1051/0004-6361:20021846.
  4. Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H.
  5. da Silva, L.; et al. (November 2006). "Basic physical parameters of a selected sample of evolved stars". Astronomy and Astrophysics. 458 (2): 609–623. arXiv:astro-ph/0608160. Bibcode:2006A&A...458..609D. doi:10.1051/0004-6361:20065105. S2CID 9341088.
  6. Setiawan, J.; et al. (July 2004). "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch". Astronomy and Astrophysics. 421: 241–254. Bibcode:2004A&A...421..241S. doi:10.1051/0004-6361:20041042-1.
  7. "HD 47536". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-03.
  8. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  9. Soto, M. G.; et al. (August 2015). "RAFT - I. Discovery of new planetary candidates and updated orbits from archival FEROS spectra". Monthly Notices of the Royal Astronomical Society. 451 (3): 3131–3144. arXiv:1505.04796. Bibcode:2015MNRAS.451.3131S. doi:10.1093/mnras/stv1144. S2CID 49332927.
  10. "Distant World in Peril Discovered from La Silla: Giant Exoplanet Orbits Giant Star". ESO for the Public (Press release). Garching, Germany: European Southern Observatory. 22 January 2003. Retrieved 30 December 2012.

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