HD 11506

HD 11506 is a star in the equatorial constellation of Cetus. It has a yellow hue and can be viewed with a small telescope but is too faint to be visible to the naked eye, having an apparent visual magnitude of 7.51.[2] The distance to this object is 167 light years based on parallax, but it is drifting closer to the Sun with a radial velocity of −7 km/s.[1] It has an absolute magnitude of 3.94.[2]

HD 11506
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus
Right ascension  01h 52m 50.53455s[1]
Declination −19° 30′ 25.1108″[1]
Apparent magnitude (V) 7.51[2]
Characteristics
Spectral type G0V[3]
B−V color index 0.607±0.015[2]
Astrometry
Radial velocity (Rv)−7.37±0.17[1] km/s
Proper motion (μ) RA: 21.907±0.101[1] mas/yr
Dec.: −97.734±0.078[1] mas/yr
Parallax (π)19.4792 ± 0.0509[1] mas
Distance167.4 ± 0.4 ly
(51.3 ± 0.1 pc)
Absolute magnitude (MV)3.94[2]
Details[4]
Mass1.12±0.02 M☉
Radius1.06±0.01 R☉
Luminosity1.17±0.01 L☉
Surface gravity (log g)4.43±0.02 cgs
Temperature5,833±28 K
Metallicity [Fe/H]0.29±0.03[5] dex
Rotational velocity (v sin i)5.01[6] km/s
Age1.6±0.9 Gyr
Other designations
BD−20°358, HD 11506, HIP 8770, SAO 148079[7]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

This object is an ordinary G-type main-sequence star with a stellar classification of G0V,[3] which indicates it is generating energy via hydrogen fusion at its core. It is around 1.6[4] billion years old and is spinning with a projected rotational velocity of 5 km/s.[6] The star has 112% of the mass of the Sun and 106% of the Sun's radius. The spectrum shows a higher than solar abundance of elements other than hydrogen and helium – what astronomers term the metallicity.[5] The star is radiating 117% of the Sun's luminosity from its photosphere at an effective temperature of 5,833 K.[4]

Planetary system

The superjovian planet HD 11506 b was discovered orbiting the star by the N2K Consortium in 2007 using the doppler spectroscopy method.[3] In 2009, a second planet discovery was claimed based on Bayesian analysis of the original data.[8] However, in 2015 additional radial velocity measurements showed that the planetary parameters were significantly different than those determined by Bayesian analysis. An additional linear trend in the radial velocities indicates a stellar or planetary companion on a long term orbit.[5]

The HD 11506 planetary system[9]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
c ≥0.408±0.057 MJ 0.774±0.038 223.41±0.32 0.193±0.038 — —
b ≥4.83±0.52 MJ 2.9±0.14 1,622.1±2.1 0.3743±0.0053 — —

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.
  3. Fischer, Debra A.; et al. (2007). "Five Intermediate-Period Planets from the N2K Sample". The Astrophysical Journal. 669 (2): 1336–1344. arXiv:0704.1191. Bibcode:2007ApJ...669.1336F. doi:10.1086/521869.
  4. 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. Giguere, Matthew J.; et al. (2015). "Newly Discovered Planets Orbiting HD 5319, HD 11506, HD 75784 and HD 10442 from the N2K Consortium". The Astrophysical Journal. 799 (1). 89. arXiv:1411.5374. Bibcode:2015ApJ...799...89G. doi:10.1088/0004-637X/799/1/89.
  6. Delgado Mena, E.; et al. (April 2015). "Li abundances in F stars: planets, rotation, and Galactic evolution". Astronomy & Astrophysics. 576: 24. arXiv:1412.4618. Bibcode:2015A&A...576A..69D. doi:10.1051/0004-6361/201425433. A69.
  7. "HD 11506". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-10.
  8. Tuomi, M.; Kotiranta, S. (2009). "Bayesian analysis of the radial velocities of HD 11506 reveals another planetary companion". Astronomy and Astrophysics. 496 (2): L13–L16. arXiv:0902.2997. Bibcode:2009A&A...496L..13T. doi:10.1051/0004-6361/200811531.
  9. Ment, Kristo; et al. (2018). "Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810". The Astronomical Journal. 156 (5). 213. arXiv:1809.01228. Bibcode:2018AJ....156..213M. doi:10.3847/1538-3881/aae1f5.

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