Astronomy:HD 134606
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Apus |
| Right ascension | 15h 15m 15.04464s[1] |
| Declination | −70° 31′ 10.6449″[1] |
| Apparent magnitude (V) | 6.86[2] |
| Characteristics | |
| Spectral type | G6 IV[3] |
| B−V color index | 0.740±0.001[2] |
| Astrometry | |
| Radial velocity (Rv) | +1.94±0.12[1] km/s |
| Proper motion (μ) | RA: −177.871[1] mas/yr Dec.: −164.709[1] mas/yr |
| Parallax (π) | 37.3020 ± 0.0182[1] mas |
| Distance | 87.44 ± 0.04 ly (26.81 ± 0.01 pc) |
| Absolute magnitude (MV) | 4.74[2] |
| Details[4] | |
| Mass | 1.046+0.070 −0.059 M☉ |
| Radius | 1.158+0.039 −0.036 R☉ |
| Luminosity | 1.161+0.071 −0.049 L☉ |
| Surface gravity (log g) | 4.330+0.044 −0.041 cgs |
| Temperature | 5,576+86 −85 K |
| Metallicity [Fe/H] | +0.343+0.081 −0.084 dex |
| Rotation | 42.0±3.9 d |
| Age | 7.3+3.6 −3.4 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 134606 is a yellow-hued star with a planetary system, positioned in the southern constellation of Apus. It is below the nominal limit for visibility with the naked eye, having an apparent visual magnitude of 6.86.[2] Based upon an annual parallax shift of 37.3 mas, it is located 87.44 light-years away. The star appears to be moving further from the Earth with a heliocentric radial velocity of +1.9 km/s.[1]
This is an evolving G-type subgiant star with a stellar classification of G6 IV[3] and is not considered active, having a chromospheric activity index of −5.04.[6] It has about the same[7] mass as the Sun but is 25% more luminous.[2] The photosphere is radiating energy at an effective temperature of 5,614 K.[7] It has a higher than solar metallicity rating – a term astronomers use to describe the abundance of elements other than hydrogen and helium.[7]
There is a red dwarf companion star of spectral type M3V at a separation of ~1500 AU, designated L 72-1.[8][4]
Planetary system
The discovery of a planetary system orbiting HD 134606 was announced in 2011 following an eight-year survey carried out at the La Silla Observatory in Chile . The detection was made via the radial velocity method using the HARPS instrument. Applying a Keplerian fit to the data suggests the presence of three planets in moderately eccentric orbits.[9] The planets are successively more massive the further away they are from the star.[10] None of the planetary orbits displays a mean motion resonance with the others.[11]
The system was updated by a 2024 study, which confirmed the three previously reported planets, though with a longer period for planet d, and detected two new ones. While all five planets are very likely to be real, the study advises caution regarding planet f due to the similarity of its period to the lunar cycle. The five planets range from super-Earth to super-Neptune mass, and the outermost, HD 134606 d, is a small gas giant orbiting within the habitable zone that may be a candidate for future space-based direct imaging missions. A long-period radial velocity trend was also detected, suggesting the presence of a distant sixth substellar companion of some kind.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| e | ≥2.34+0.35 −0.34 M⊕ |
0.0527+0.0011 −0.0012 |
4.3203+0.00051 −0.00047 |
0.2+0.14 −0.13 |
— | — |
| b | ≥9.09+0.64 −0.63 M⊕ |
0.1046+0.0023 −0.0024 |
12.089+0.0016 −0.0015 |
0.092+0.054 −0.053 |
— | — |
| f | ≥5.63+0.72 −0.69 M⊕ |
0.1784+0.0039 −0.0041 |
26.915±0.016 | 0.081+0.1 −0.059 |
— | — |
| c | ≥11.31+1.0 −0.99 M⊕ |
0.3007+0.0066 −0.0069 |
58.883+0.041 −0.039 |
0.055+0.062 −0.04 |
— | — |
| d | ≥44.8±2.9 M⊕ | 1.941+0.043 −0.046 |
966.5+5.3 −6.9 |
0.092±0.045 | — | — |
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 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. doi:10.1086/504637. Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 4.2 4.3 Li, Zhexing; Kane, Stephen R.; Brandt, Timothy D.; Fetherolf, Tara; Robertson, Paul; Zhao, Jinglin; Dalba, Paul A.; Wittenmyer, Robert A. et al. (January 2024). "Revised Architecture and Two New Super-Earths in the HD 134606 Planetary System". The Astronomical Journal.
- ↑ "HD 134606". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+134606.
- ↑ Jenkins, J. S. et al. (October 2006), "An activity catalogue of southern stars", Monthly Notices of the Royal Astronomical Society 372 (1): 163–173, doi:10.1111/j.1365-2966.2006.10811.x, Bibcode: 2006MNRAS.372..163J.
- ↑ 7.0 7.1 7.2 Tsantaki, M. et al. (July 2013). "Deriving precise parameters for cool solar-type stars. Optimizing the iron line list". Astronomy & Astrophysics 555: A150. doi:10.1051/0004-6361/201321103. Bibcode: 2013A&A...555A.150T.
- ↑ "L 72-1". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=L+72-1.
- ↑ Mayor, M.; Marmier, M.; Lovis, C.; Udry, S.; Ségransan, D.; Pepe, F.; Benz, W.; Bertaux, J.-L. et al. (September 13, 2011), The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets
- ↑ Schlaufman, Kevin C. (2014). "Tests of in situ Formation Scenarios for Compact Multiplanet Systems". The Astrophysical Journal 790 (2): 11. doi:10.1088/0004-637X/790/2/91. 91. Bibcode: 2014ApJ...790...91S.
- ↑ Giuppone, C. A. et al. (December 2013), "A semi-empirical stability criterion for real planetary systems with eccentric orbits", Monthly Notices of the Royal Astronomical Society 436 (4): 3547–3556, doi:10.1093/mnras/stt1831, Bibcode: 2013MNRAS.436.3547G
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