Astronomy:HD 110113

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Short description: Star
HD 110113
Observation data
Equinox J2000.0]] (ICRS)
Constellation Centaurus[1]
Right ascension  12h 40m 08.781s[2]
Declination −44° 18′ 43.27″[2]
Apparent magnitude (V) 10.063[3]
Characteristics
Evolutionary stage main-sequence
Spectral type G8V[4]
B−V color index 0.697±0.041[1]
Astrometry
Radial velocity (Rv)17.46[2] km/s
Proper motion (μ) RA: −3.723[2] mas/yr
Dec.: −13.766[2] mas/yr
Parallax (π)9.4499 ± 0.0158[2] mas
Distance345.1 ± 0.6 ly
(105.8 ± 0.2 pc)
Details
Mass0.997±0.08[3] M
Radius0.968[3] R
Luminosity0.91[2] L
Surface gravity (log g)4.46±0.05[3] cgs
Temperature5,732±16[3] K
Metallicity [Fe/H]−0.004[2] dex
Rotation20.8±1.2 d[3]
Rotational velocity (v sin i)1.74[3] km/s
Age4.0[3] Gyr
Other designations
CD−43°7805, HD 110113, HIP 61820, PPM 317672, TOI-755[5]
Database references
SIMBADdata

HD 110113, also known as TOI-755, is a star with a pair of orbiting exoplanets in the Centaurus constellation. With an apparent visual magnitude of 10.063,[3] it is much too faint to be viewed with the naked eye. The system is located at a distance from the Solar System of about 346.5 light-years (106.2 parsecs). It is drifting further away with a heliocentric radial velocity of 17 km/s.[2] A planetary system was discovered orbiting this star in 2021.[3]

The spectrum of HD 110113 presents as a G-type main-sequence star, or yellow dwarf, with a stellar classification of G8V.[4] It has an estimated age of four billion years and is spinning slowly with a rotation period of 20.8 days. The star is considered a solar analog, having nearly the same mass and size as the Sun. It radiating 91% of the Sun's luminosity from its photosphere at an effective temperature of 5,732 K. The star displays rotationally-modulated variability that is indicative of star spots.[3]

Planetary system

The two candidate planets orbiting TOI-755 – TOI-755b and TOI-755c – were announced in 2021. TOI-755b's temperature is over 1,570 K (1,300 °C) and TOI-755c's temperature is cooler at around 1,260 K (990 °C), which means they are Hot Neptunes.[3]

The HD 110113 planetary system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 4.54 ± 0.64 M 0.035 2.541+0.0005−0.001 2.05 ± 0.12 R
c 10.49 ± 1.2 M 0.068+0.001−0.002 6.744+0.008−0.009

References

  1. Jump up to: 1.0 1.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A 
  2. Jump up to: 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 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.
  3. Jump up to: 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 Osborn, H. P. et al. (2021), "A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113", Monthly Notices of the Royal Astronomical Society 502 (4): 4842–4857, doi:10.1093/mnras/stab182, Bibcode2021MNRAS.502.4842O 
  4. Jump up to: 4.0 4.1 Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Ann Arbor: Dept. Of Astronomy, University of Michigan 2. Bibcode1978mcts.book.....H. 
  5. "HD 110113". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+110113.