Astronomy:HD 113538
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 13h 04m 57.47645s[1] |
| Declination | −52° 26′ 34.5284″[1] |
| Apparent magnitude (V) | 9.05[2] |
| Characteristics | |
| Spectral type | K9Vk:[3] |
| B−V color index | 1.362±0.009[2] |
| Astrometry | |
| Radial velocity (Rv) | 39.23±0.012[4] km/s |
| Proper motion (μ) | RA: −786.038[1] mas/yr Dec.: −795.591[1] mas/yr |
| Parallax (π) | 61.3899 ± 0.0523[1] mas |
| Distance | 53.13 ± 0.05 ly (16.29 ± 0.01 pc) |
| Absolute magnitude (MV) | 8.03[4] |
| Details[4] | |
| Mass | 0.585±0.05 M☉ |
| Radius | 0.53±0.02 R☉ |
| Luminosity | 0.127[1] L☉ |
| Surface gravity (log g) | 3.79±0.53 cgs |
| Temperature | 4,462±145 K |
| Metallicity [Fe/H] | −0.24±0.06 dex |
| Age | 4.3±4.0 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 113538 (Gliese 496.1) is a star with two planetary companions in the southern constellation of Centaurus. It is much too faint to be viewed with the naked eye at an apparent visual magnitude of 9.05.[2] The distance to this star is 53 light years and it is drifting further away with a radial velocity of +39 km/s.[4]
This is a K-type main-sequence star of a late spectral type, classified as K9Vk:. It displays chromospheric activity with a stellar cycle of at least four years and is metal poor.[4] The star has 58.5% of the mass and 53% of the radius of the Sun.[4] It is radiating just 12.7%[1] of the luminosity of the Sun from its photosphere at an effective temperature of 4,462 K.[4]
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,[6] SMW 1.05[4]), 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[7]—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 | ≥ 0.36±0.04 MJ | 1.24±0.04 | 663.2+8.4 −7.4 |
0.14±0.08 | — | — |
| c | ≥ 0.93±0.06 MJ | 2.44±0.07 | 1,818+25 −22 |
0.20±0.04 | — | — |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 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.
- ↑ 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.
- ↑ Gray, R. O. et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 Moutou, Claire et al. (April 2015). "The HARPS search for southern extra-solar planets. XXXVII. Five new long-period giant planets and a system update". Astronomy & Astrophysics 576: 14. doi:10.1051/0004-6361/201424965. A48. Bibcode: 2015A&A...576A..48M.
- ↑ "HD 113538". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+113538.
- ↑ Gray, R. O. et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. Bibcode: 2006AJ....132..161G.
- ↑ Moutou, Claire; Mayor, Michel; Lo Curto, Gaspare; Ségransan, Damien; Udry, Stéphane; Bouchy, François; Benz, Willy; Lovis, Christophe et al. (2010), The HARPS search for southern extra-solar planets: XXVI: Seven new planetary systems, doi:10.1051/0004-6361/201015371
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