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 K. [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

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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