HD 88133

Last updated
HD 88133
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Leo
Right ascension 10h 10m 07.676s [1]
Declination +18° 11′ 12.73″ [1]
Apparent magnitude  (V)8.01 [2]
Characteristics
Spectral type G8V [3]
B−V color index 0.810±0.015 [2]
Astrometry
Radial velocity (Rv)−3.62±0.14 [4]  km/s
Proper motion (μ)RA: −11.135  mas/yr [1]
Dec.: −264.912  mas/yr [1]
Parallax (π)13.5882 ± 0.0249  mas [1]
Distance 240.0 ± 0.4  ly
(73.6 ± 0.1  pc)
Absolute magnitude  (MV)3.50 [5]
Details
Mass 1.23±0.16 [6]   M☉
Radius 2.01±0.04 [6]   R☉
Luminosity 3.14±0.02 [4]   L☉
Surface gravity (log g)3.82 [5]   cgs
Temperature 5,414±97 [4]   K
Metallicity [Fe/H]0.26 [5]   dex
Rotational velocity (v sin i)4.9 [5]  km/s
Age 5.08 [5]   Gyr
Other designations
BD+18 2326, HD  88133, HIP  49813, SAO  98978, LTT  12725, NLTT  23562, TYC  1422-1130-1, 2MASS J10100767+1811132 [7]
Database references
SIMBAD data

HD 88133 is a yellow star with an orbiting exoplanet in the equatorial constellation of Leo. It has an apparent visual magnitude of 8.01, [2] which is too faint to be visible to the naked eye. With a small telescope it should be easily visible. The distance to this system, as measured through parallax, is 240  light years, but it is slowly drifting closer with a radial velocity of −3.6 km/s. [4]

Contents

This is classified as an ordinary G-type main-sequence star with a stellar classification of G8V. [3] However, D. A. Fischer and associates in 2005 listed a class of G5 IV, suggesting it is instead a subgiant star that is evolving away from the main sequence having exhausted the hydrogen at its core. [8] It is about 5 billion years old and is spinning with a projected rotational velocity of 4.9 km/s. [5] The star has 23% more mass than the Sun and has double the Sun's girth. [6] It is radiating over three times the luminosity of the Sun from its photosphere at an effective temperature of 5,414 km/s. [4]

Planetary system

In 2004 a close orbiting exoplanet was found using Doppler spectroscopy. [8] In 2016 the direct detection of the planetary thermal emission spectrum was claimed, [9] but the detection was brought into questioned in 2021. [10]

The HD 88133 planetary system [11]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥0.282±0.046  MJ 0.0479±0.00323.414887±0.0000450 (fixed)——

See also

Related Research Articles

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HD 77338 is a star with a close orbiting exoplanet companion in the southern constellation of Pyxis. It is too dim to be visible with the naked eye, having an apparent visual magnitude of 8.63. The system is located at a distance of 149 light years, and it is drifting further away with a heliocentric radial velocity of 8.2 km/s.

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References

  1. 1 2 3 4 5 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.
  2. 1 2 3 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.
  3. 1 2 Grieves, N.; et al. (December 2018). "Chemo-kinematics of the Milky Way from the SDSS-III MARVELS survey". Monthly Notices of the Royal Astronomical Society. 481 (3): 3244–3265. arXiv: 1803.11538 . Bibcode:2018MNRAS.481.3244G. doi: 10.1093/mnras/sty2431 .
  4. 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.
  5. 1 2 3 4 5 6 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.
  6. 1 2 3 Stassun, Keivan G.; et al. (March 2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal. 153 (3): 20. arXiv: 1609.04389 . Bibcode:2017AJ....153..136S. doi: 10.3847/1538-3881/aa5df3 . S2CID   119219062. 136.
  7. ↑ "HD 88133". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-12-28.
  8. 1 2 Fischer, Debra A.; et al. (2005). "The N2K Consortium. I. A Hot Saturn Planet Orbiting HD 88133". The Astrophysical Journal. 620 (1): 481–486. Bibcode: 2005ApJ...620..481F . doi: 10.1086/426810 .
  9. ↑ Piskorz, Danielle; et al. (23 November 2016). "Evidence for the Direct Detection of the Thermal Spectrum of the Non-Transiting Hot Gas Giant HD 88133 b". The Astrophysical Journal. 832 (2). 131. arXiv: 1609.09074 . Bibcode: 2016ApJ...832..131P . doi: 10.3847/0004-637X/832/2/131 .
  10. ↑ Buzard, Cam; et al. (29 November 2021). "Reinvestigation of the Multiepoch Direct Detections of HD 88133 b and Upsilon Andromedae b". The Astronomical Journal. 162 (6). 269. arXiv: 2109.13275 . Bibcode: 2021AJ....162..269B . doi: 10.3847/1538-3881/ac2a2c .
  11. ↑ 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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