HD 1237

Last updated
HD 1237
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Hydrus
Right ascension 00h 16m 12.6791s [1]
Declination −79° 51′ 04.2447″ [1]
Apparent magnitude  (V)6.59
Characteristics
HD 1237 A
Spectral type G6 V
B−V color index 0.749
HD 1237 B
Spectral type M4 V [2]
Astrometry
Radial velocity (Rv)−5.2±0.2 [3]  km/s
Proper motion (μ)RA: 433.908±0.044 [1]   mas/yr
Dec.: −56.322±0.039 [1]   mas/yr
Parallax (π)56.9319 ± 0.0235  mas [1]
Distance 57.29 ± 0.02  ly
(17.565 ± 0.007  pc)
Absolute magnitude  (MV)5.37 ± 0.01 [4]
Details
HD 1237 A
Mass 1.00 ± 0.10 [5]   M☉
Radius 0.86 ± 0.07 [5]   R☉
Luminosity 0.64 [5]   L☉
Surface gravity (log g)4.58 ± 0.09 [5]   cgs
Temperature 5,572 ± 40 [5]   K
Metallicity [Fe/H]0.12 ± 0.04 [5]   dex
Rotation 7.0±0.7 d [3]
Rotational velocity (v sin i)5.3±1.0 [3]  km/s
Age 800 [6]   Myr
HD 1237 B
Mass 0.13 [2]   M☉
Other designations
2 G. Hydri, CD−80° 9, GJ  3021, HD  1237, HIP  1292, SAO  258219, 2MASS J00161266-7951042
Database references
SIMBAD data

HD 1237 is a binary star system approximately 57 light-years away in the constellation of Hydrus (the Water Snake).

Contents

The visible star in the system, A, is considered to be a solar analog due close mass to the sun. HD 1237 differs from the sun in that HD 1237 is much younger, has high metallicity, has much cooler temperature and is in a binary system. As of 2000, it has been confirmed that an extrasolar planet orbits the star. It is of note for being a relatively Sun-like star not very far from the Sun that is home to an extrasolar planet. [7]

Stellar components

As a nearby Sun-like star, the last decade has seen HD 1237 A being studied carefully for the first time, especially after its substellar companion was discovered. It is currently believed that it is 800 million years old, though age estimates range from 150 million to 8.8 billion years old depending on the method used for the determination. [6] The star is more enriched with iron than the Sun, is chromospherically active, and rotates around its axis more quickly than the Sun.

The secondary star was discovered in 2006 during a deep imaging survey conducted at the European Southern Observatory using the Very Large Telescope. [8] HD 1237 B is a M4 red dwarf star at a projected separation of 68 AU. [2]

Planetary system

Announced in 2000, the Jovian planet GJ 3021 b (GJ 3021 being an alternate less-used designation for this star) orbits about 0.5 astronomical units from HD 1237 A with a minimum mass 3.37 times that of Jupiter, as determined by measuring variations in the radial velocity of the star. A study published in 2001 suggested that the usual inability to determine the orbital inclination of an extrasolar planet through radial velocity measurement had caused this mass to be severely underestimated. [9] The astrometric orbit gives an orbital inclination of 11.8° and a mass of 16 Jupiter masses, which would make the object a brown dwarf. However, later analysis showed that Hipparcos was not sensitive enough to accurately determine astrometric orbits for substellar companions, which means the inclination (and hence the true mass) of the planet are still unknown. [10]

The HD 1237 planetary system [7]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >3.37  MJ 0.49133.71 ± 0.200.511 ± 0.017——

See also

Related Research Articles

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HD 117207 is a star in the southern constellation Centaurus. With an apparent visual magnitude of 7.24, it is too dim to be visible to the naked eye but can be seen with a small telescope. Based upon parallax measurements, it is located at a distance of 105.4 light-years from the Sun. The star is drifting closer with a radial velocity of −17.4 km/s. It has an absolute magnitude of 4.67.

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<span class="mw-page-title-main">GJ 3021 b</span> Extrasolar planet in the constrellation Hydrus

GJ 3021 b, also known as Gliese 3021 b or HD 1237 b, is an extrasolar planet approximately 57 light-years away, orbiting its bright G-dwarf parent star in the Southern constellation of Hydrus. It was discovered with the Swiss Euler Telescope at the Chilean La Silla Observatory in 2000.

HD 111232 b is an extrasolar planet that orbits at almost 2 AU with a minimum mass of 6.8 times that of Jupiter. This planet was discovered in the La Silla Observatory by Michel Mayor using the CORALIE spectrograph on 30 June 2003, along with six other planets, including HD 41004 Ab, HD 65216 b, HD 169830 c, HD 216770 b, HD 10647 b, and HD 142415 b.

BD−17 63 is a low-mass K-type main-sequence star in the southern constellation Cetus. It is a 10th magnitude star at a distance of 113 light years from Earth. The star is rotating slowly with a negligible level of magnetic activity and an age of over 4 billion years.

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HD 106515 is a binary star in the constellation of Virgo.

References

  1. 1 2 3 4 5 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. 1 2 3 Chauvin, G.; et al. (2007). "Characterization of the long-period companions of the exoplanet host stars: HD 196885, HD 1237 and HD 27442". Astronomy and Astrophysics. 475 (2): 723–727. arXiv: 0710.5918 . Bibcode:2007A&A...475..723C. doi:10.1051/0004-6361:20067046. S2CID   16950822.
  3. 1 2 3 Alvarado-Gómez, J. D.; et al. (2015). "Activity and magnetic field structure of the Sun-like planet-hosting star HD 1237". Astronomy and Astrophysics. 582. A38. arXiv: 1507.04117 . Bibcode:2015A&A...582A..38A. doi:10.1051/0004-6361/201525771. S2CID   39311967.
  4. ↑ Holmberg; et al. (2009). "HD 1237". Geneva-Copenhagen Survey of Solar neighbourhood III. Retrieved 2010-12-04.
  5. 1 2 3 4 5 6 Ghezzi, L.; et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal, 720 (2): 1290–1302, arXiv: 1007.2681 , Bibcode:2010ApJ...720.1290G, doi:10.1088/0004-637X/720/2/1290, S2CID   118565025
  6. 1 2 Saffe, C.; et al. (2005). "On the Ages of Exoplanet Host Stars". Astronomy and Astrophysics. 443 (2): 609–626. arXiv: astro-ph/0510092 . Bibcode:2005A&A...443..609S. doi:10.1051/0004-6361:20053452. S2CID   11616693.
  7. 1 2 Naef, D.; et al. (2001). "The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets". Astronomy and Astrophysics. 375 (1): 205–218. arXiv: astro-ph/0106255 . Bibcode:2001A&A...375..205N. doi:10.1051/0004-6361:20010841. S2CID   16606841.
  8. ↑ Chauvin, G.; et al. (2006). "Probing long-period companions to planetary hosts". Astronomy and Astrophysics. 456 (3): 1165–1172. arXiv: astro-ph/0606166 . Bibcode:2006A&A...456.1165C. doi:10.1051/0004-6361:20054709. S2CID   15611548.
  9. ↑ Han; et al. (2001). "Preliminary astrometric masses for proposed extrasolar planetary companions". The Astrophysical Journal. 548 (1): L57–L60. Bibcode:2001ApJ...548L..57H. doi:10.1086/318927. S2CID   120952927. Archived from the original on 2015-11-06. Retrieved 2009-03-09.
  10. ↑ Pourbaix, D.; Arenou, F. (2001). "Screening the Hipparcos-based astrometric orbits of sub-stellar objects". Astronomy and Astrophysics . 372 (3): 935–944. arXiv: astro-ph/0104412 . Bibcode:2001A&A...372..935P. doi:10.1051/0004-6361:20010597. S2CID   378792.
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