| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 40m 01.7283s [1] |
| Declination | +06° 03′ 38.073″ [1] |
| Apparent magnitude (V) | 8.67 [2] |
| Characteristics | |
| Spectral type | K0 V [3] |
| B−V color index | 0.827±0.005 [2] |
| Astrometry | |
| Radial velocity (Rv) | −22.08±0.15 [1] km/s |
| Proper motion (μ) |
RA: 52.246(26)
mas/
yr
[1] Dec.: −247.136(17) mas/ yr [1] |
| Parallax (π) | 21.4364 ± 0.0224 mas [1] |
| Distance | 152.2 ± 0.2
ly (46.65 ± 0.05 pc) |
| Absolute magnitude (MV) | 5.46 [2] |
| Details [4] | |
| Mass | 0.98±0.01 M☉ |
| Radius | 0.89±0.01 R☉ |
| Luminosity | 0.602±0.002 L☉ |
| Surface gravity (log g) | 4.52±0.01 cgs |
| Temperature | 5,380±13 K |
| Metallicity [Fe/H] | 0.25±0.04 [5] dex |
| Rotation | 57.67 [3] days |
| Rotational velocity (v sin i) | 4.5 [6] km/s |
| Age | 1.8±1.0 or 7 [3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 37605 is a star in the equatorial constellation of Orion. It is orange in hue but is too faint to be visible to the naked eye, having an apparent visual magnitude of 8.67. [2] Parallax measurements yield a distance estimate of 152 light years from the Sun. It has a high proper motion [3] and is drifting closer with a radial velocity of −22 km/s. [1]
This object is a K-type main-sequence star with a stellar classification of K0 V. [3] It is an inactive, metal-rich star. Age estimates range from 1.8 [4] up to 7 [3] billion years old, and it is spinning with a projected rotational velocity of 4.5 km/s. [6] The star has 98% of the mass of the Sun and 89% of the Sun's radius. It is radiating 60% of the luminosity of the Sun from its photosphere at an effective temperature of 5,380 K. [4]
Planets
There are two giant planets known in orbit. Planet b was discovered in 2004 [8] and planet c was discovered eight years later. The planets do not transit relative to Earth; b's maximum inclination is 88.1%. [3] [9]
In a simulation, HD 37605 b's orbit "sweeps clean" most test particles within 0.5 AU; leaving only asteroids "in low-eccentricity orbits near the known planet’s apastron distance, near the 1:2 mean-motion resonance" with oscillating eccentricity up to 0.06, and also at 1:3 with oscillating eccentricity up to 0.4. Also, observation has ruled out planets heavier than 0.7 Jupiter mass with a period of one year or less; which still allows for planets at 0.8 AU or more. [10]
| Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥2.69±0.3 MJ | 0.277±0.015 | 55.01292±0.00062 | 0.6745±0.0019 | — | — |
| c | ≥3.19±0.38 MJ | 3.74±0.21 | 2720±15 | 0.03±0.012 | — | — |
References
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211. Bibcode: 2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d 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.
- ^ a b c d e f g Wang Xuesong, Sharon; et al. (2012). "The Discovery of HD 37605c and a Dispositive Null Detection of Transits of HD 37605b". Astrophysical Journal. 761 (1): 46. arXiv: 1210.6985. Bibcode: 2012ApJ...761...46W. doi: 10.1088/0004-637X/761/1/46. S2CID 118679173.
- ^ a b c 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. S2CID 54555839.
- ^ Aguilera-Gómez, Claudia; et al. (2018). "Lithium abundance patterns of late-F stars: An in-depth analysis of the lithium desert". Astronomy and Astrophysics. 614: A55. arXiv: 1803.05922. Bibcode: 2018A&A...614A..55A. doi: 10.1051/0004-6361/201732209. S2CID 62799777.
- ^ a b Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 19. arXiv: 1611.02897. Bibcode: 2017AJ....153...21L. doi: 10.3847/1538-3881/153/1/21. S2CID 119511744. 21.
- ^ "HD 37605". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-31.
- ^ Cochran, Michael; et al. (2004). "The First Hobby-Eberly Telescope Planet: A Companion to HD 37605". The Astrophysical Journal Letters. 611 (2): L133–L136. arXiv: astro-ph/0407146. Bibcode: 2004ApJ...611L.133C. doi: 10.1086/423936. S2CID 85460384.
- ^ Kane, S. (2012). "The TERMS Project: More Than Just Transit Exclusion". OASIS. 44 (228.07). Bibcode: 2012AAS...21922807K.
- ^ Wittenmyer, Robert A.; et al. (2007). "Dynamical and Observational Constraints on Additional Planets in Highly Eccentric Planetary Systems". The Astronomical Journal. 134 (3): 1276–1284. arXiv: 0706.1962. Bibcode: 2007AJ....134.1276W. doi: 10.1086/520880. S2CID 14345035. Archived from the original on 2012-08-02. Retrieved 2012-10-29.
- ^ 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. S2CID 119243619.
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