Astronomy:HD 88133

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Short description: Star in the constellation Leo
HD 88133
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas/yr
Dec.: −264.912[1] mas/yr
Parallax (π)13.5882 ± 0.0249[1] mas
Distance240.0 ± 0.4 ly
(73.6 ± 0.1 pc)
Absolute magnitude (MV)3.50[5]
Details
Mass1.23±0.16[6] M☉
Radius2.01±0.04[6] R☉
Luminosity3.14±0.02[4] L☉
Surface gravity (log g)3.82[5] cgs
Temperature5,414±97[4] K
Metallicity [Fe/H]0.26[5] dex
Rotational velocity (v sin i)4.9[5] km/s
Age5.08[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
SIMBADdata

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]

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±0.0032 3.414887±0.000045 0 (fixed) — —

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 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. ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 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. doi:10.1093/mnras/sty2431. Bibcode: 2018MNRAS.481.3244G. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal 153 (1): 19. doi:10.3847/1538-3881/153/1/21. 21. Bibcode: 2017AJ....153...21L. 
  6. ↑ 6.0 6.1 6.2 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. doi:10.3847/1538-3881/aa5df3. 136. Bibcode: 2017AJ....153..136S. 
  7. ↑ "HD 88133". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+88133. 
  8. ↑ 8.0 8.1 Fischer, Debra A. et al. (2005). "The N2K Consortium. I. A Hot Saturn Planet Orbiting HD 88133". The Astrophysical Journal 620 (1): 481–486. doi:10.1086/426810. Bibcode: 2005ApJ...620..481F. 
  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. doi:10.3847/0004-637X/832/2/131. Bibcode: 2016ApJ...832..131P. 
  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. doi:10.3847/1538-3881/ac2a2c. Bibcode: 2021AJ....162..269B. 
  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. doi:10.3847/1538-3881/aae1f5. Bibcode: 2018AJ....156..213M. 

Coordinates: Sky map 10h 10m 07.68s, +18° 11′ 12.74″

J10100767+1811132



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