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]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| 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 mas/yr[2] Dec.: −13.766 mas/yr[2] |
| Parallax (π) | 9.4499 ± 0.0158 mas[2] |
| Distance | 345.1 ± 0.6 ly (105.8 ± 0.2 pc) |
| Details | |
| Mass | 0.997±0.08[3] M☉ |
| Radius | 0.968[3] R☉ |
| Luminosity | 0.91[2] L☉ |
| Surface gravity (log g) | 4.46±0.05[3] cgs |
| Temperature | 5,732±16[3] K |
| Metallicity [Fe/H] | −0.004[2] dex |
| Rotation | 20.8±1.2 d[3] |
| Rotational velocity (v sin i) | 1.74[3] km/s |
| Age | 4.0[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
editThe 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]
| 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
edit- ^ a b 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
- ^ a b c d e f g h 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.
- ^ a b c d e f g h i j k l 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, arXiv:2101.04745, Bibcode:2021MNRAS.502.4842O, doi:10.1093/mnras/stab182
- ^ a b Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Ann Arbor: Dept. Of Astronomy, University of Michigan. 2. Bibcode:1978mcts.book.....H.
- ^ "HD 110113". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-12-22.