Astronomy:HD 11506
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cetus |
| Right ascension | 01h 52m 50.53442s[1] |
| Declination | −19° 30′ 25.1082″[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) | −7.53±0.13[1] km/s |
| Proper motion (μ) | RA: 22.039(22)[1] mas/yr Dec.: −97.904(16)[1] mas/yr |
| Parallax (π) | 19.5342 ± 0.0221[1] mas |
| Distance | 167.0 ± 0.2 ly (51.19 ± 0.06 pc) |
| Absolute magnitude (MV) | 3.94[2] |
| Details[4] | |
| Mass | 1.22±0.02[5] M☉ |
| Radius | 1.06±0.01 R☉ |
| Luminosity | 1.17±0.01 L☉ |
| Surface gravity (log g) | 4.43±0.02 cgs |
| Temperature | 5,833±28 K |
| Metallicity [Fe/H] | +0.30±0.06[5] dex |
| Rotation | ~15 days[5] |
| Rotational velocity (v sin i) | 5.5±0.5[5] km/s |
| Age | 1.6±0.9 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | 11506 data |
| Extrasolar Planets Encyclopaedia | data |
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 −7.5 km/s.[1] It has an absolute magnitude of 3.94.[2]
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.[7] 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.[8] 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.[9] 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 indicated a stellar or planetary companion on a long term orbit.[8]
In 2022, the presence of a third planet was confirmed, and the mass and inclination of both planet b and the new planet d were measured via astrometry.[10] A 2024 study also confirmed HD 11506 d, but found a significantly wider orbit and greater mass than previously estimated. This object orbits with a 73-year period, and at about 13 times the mass of Jupiter, it is at the borderline of being a brown dwarf.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| c | ≥0.40±0.02 MJ | 0.771±0.004 | 223.92±0.37 | 0.228±0.054 | — | — |
| b | 4.80±0.08 MJ | 2.885±0.016 | 1,617.7±1.9 | 0.379±0.009 | 113+23 −53[10]° |
— |
| d | 12.8+0.6 −0.5 MJ |
18.20+0.06 −0.09 |
26,517+256 −292 |
0.29+0.02 −0.03 |
90+6 −5° |
— |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 Fischer, Debra A. et al. (2007). "Five Intermediate-Period Planets from the N2K Sample". The Astrophysical Journal 669 (2): 1336–1344. doi:10.1086/521869. Bibcode: 2007ApJ...669.1336F.
- ↑ 4.0 4.1 4.2 Bonfanti, A. et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics 575: A18. doi:10.1051/0004-6361/201424951. Bibcode: 2015A&A...575A..18B. http://www.aanda.org/articles/aa/full_html/2015/03/aa24951-14/aa24951-14.html.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Ruggieri, A. et al. (September 2024). "The GAPS Programme at TNG: LVIII. Two multi-planet systems with long-period substellar companions around metal-rich stars". Astronomy & Astrophysics 689: A235. doi:10.1051/0004-6361/202449456. Bibcode: 2024A&A...689A.235R.
- ↑ "HD 11506". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+11506.
- ↑ Delgado Mena, E. et al. (April 2015). "Li abundances in F stars: planets, rotation, and Galactic evolution". Astronomy & Astrophysics 576: 24. doi:10.1051/0004-6361/201425433. A69. Bibcode: 2015A&A...576A..69D.
- ↑ 8.0 8.1 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. doi:10.1088/0004-637X/799/1/89. Bibcode: 2015ApJ...799...89G.
- ↑ 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. doi:10.1051/0004-6361/200811531. Bibcode: 2009A&A...496L..13T. http://www.aanda.org/articles/aa/full_html/2009/11/aa11531-08/aa11531-08.html.
- ↑ 10.0 10.1 Feng, Fabo et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (21): 21. doi:10.3847/1538-4365/ac7e57. Bibcode: 2022ApJS..262...21F.
Coordinates: 
01h 52m 50.534s, −19° 30′ 25.107″
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