HD 113538
HD 113538 (Gliese 496.1) is a K-type main-sequence star of a late spectral type (K9V) that lies approximately 51 light-years away in the constellation of Centaurus. The star was announced to have a planetary system in 2010.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 13h 04m 57.48s[1] |
| Declination | −52° 26′ 34.5″[1] |
| Apparent magnitude (V) | 9.057 |
| Characteristics | |
| Spectral type | K9V[2] |
| B−V color index | 1.376 |
| Astrometry | |
| Radial velocity (Rv) | 39.23±0.012[3] km/s |
| Proper motion (μ) | RA: −785.48±0.93[1] mas/yr Dec.: −795.33±0.80[1] mas/yr |
| Parallax (π) | 63.03 ± 1.36[1] mas |
| Distance | 52 ± 1 ly (15.9 ± 0.3 pc) |
| Absolute magnitude (MV) | 8.03[3] |
| Details | |
| Mass | 0.7±0.1[3] M☉ |
| Radius | 0.65±0.1[3] R☉ |
| Luminosity | 0.09[3] L☉ |
| Surface gravity (log g) | 4.28±0.37[3] cgs |
| Temperature | 4685±155[3] K |
| Metallicity [Fe/H] | −0.17±0.074[3] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
Planetary system
Radial velocity variation of HD 113538 was inferred from observations with the HARPS spectrograph. The star is active (Log R'HK −4.697,[2] SMW 1.05[3]), but the RV variation is not correlated with activity, indicating that planets are responsible. The data is fitted well by a solution including two planets, with an eccentric Saturn-mass planet and a more massive planet on a longer-period orbit—similar to the orbital architecture of the planetary system orbiting HD 163607, though with lower masses. Similar to HD 163607 b, the eccentricity and argument of periastron of HD 113538 b increases the planet's transit probability substantially more than it would be on a circular orbit.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 0.27±0.08 MJ | 0.71±0.01 | 263.3±2.3 | 0.61±0.11 | — | — |
| c | ≥ 0.71±0.06 MJ | 2.43±0.06 | 1657±48 | 0.32±0.06 | — | — |
References
- van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- Grey, R. O.; et al. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132: 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637.
- Montou, C.; et al. (2010). "The HARPS search for southern extra-solar planets. XXVII. Seven new planetary systems". Astronomy. 527: A63. arXiv:1012.3830. Bibcode:2011A&A...527A..63M. doi:10.1051/0004-6361/201015371.
