HD 11343 (HIP 8541) is a wide binary system between HD 11343 A, a K-type borderline giant star, and HD 11343 B, a red dwarf companion, located in the southern constellation of Eridanus about 500 light-years (150 pc) distant. Two gas giant exoplanets are known to orbit the primary star.
  | |
| Observation data Epoch J2000.0[1] Equinox J2000.0[1] | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 01h 50m 06.33044s |
| Declination | −54° 27′ 53.8624″ |
| Apparent magnitude (V) | 7.88[2] |
| Characteristics | |
| Evolutionary stage | Red-giant branch star |
| Spectral type | K2III/IV[2] |
| B−V color index | 1.10[2] |
| J−H color index | 0.556[2] |
| J−K color index | 0.722[2] |
| Astrometry | |
| Radial velocity (Rv) | 6.61[3] km/s |
| Proper motion (μ) | RA: 110.617[1] mas/yr Dec.: −46.798[1] mas/yr |
| Parallax (π) | 6.4964 ± 0.0156 mas[1] |
| Distance | 502 ± 1 ly (153.9 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.240+0.275 −0.225[a] |
| Orbit | |
| Primary | HD 11343 A |
| Companion | HD 11343 B |
| Semi-major axis (a) | ~2600 AU[4] |
| Details[4] | |
| HD 11343 A | |
| Mass | 1.17±0.28[4] / 2.009±0.115[5] M☉ |
| Radius | 7.83±1.02[6] R☉ |
| Luminosity | 25.1+5.8 −5.6[6] L☉ |
| Surface gravity (log g) | 2.70±0.20 cgs |
| Temperature | 4670±100 K |
| Metallicity [Fe/H] | −0.15±0.08 dex |
| Rotational velocity (v sin i) | 1.3±0.9[6] km/s |
| HD 11343 B | |
| Mass | 0.680+0.078 −0.083[7] M☉ |
| Radius | 0.698+0.062 −0.060[7] R☉ |
| Surface gravity (log g) | 4.58+0.11 −0.09[7] cgs |
| Temperature | 4351+142 −113[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Stellar characteristics
editThe HD 11343 system has an apparent magnitude of 7.88,[2] making it too faint to be visible by the naked eye from Earth under most circumstances, but can be observed using binoculars[8] as an orangish dot near Achernar.
The primary component, HD 11343 A, is a red-giant branch star slightly more massive than the Sun (albeit one estimate places its mass at a significantly higher 2.0 M☉[5]), but approximately eight times as large in radius and 25 times as luminous. It has an effective temperature of 4,670 K (4,400 °C; 7,950 °F), corresponding to its spectral type of K2, and is slightly metal-poor, with an iron content 71% that of the Sun.[6]
During a 2021 survey[9] searching for binaries within data from Gaia EDR3, the star was found to be orbited by a 13th-magnitude[10] M-dwarf, designated HD 11343 B. It is about 70% as large as the Sun both in mass and radius, is slightly cooler than the primary red giant at 4,351 K (4,078 °C; 7,372 °F), and is situated at a separation of roughly 2,600 astronomical units (0.041 ly) from its brighter companion.[4][7]
Planetary system
editIn 2016, a super-Jupiter planet orbiting HD 11343 A was discovered from radial-velocity observations, alongside three other substellar companions to giant stars, namely HIP 74890 b, HIP 84056 b, and HIP 95124 b.[6] This planet, HD 11343 b, is estimated to be slightly larger than Jupiter and has a mass of 5.7 MJ,[4] close to the initially estimated minimum of 5.5 MJ.[6] It revolves around its host star at a semi-major axis of 2.8 AU (420,000,000 km), around where the asteroid belt would lie in the Solar System, every 1,585 days (4.34 years) in a mildly eccentric orbit.[6]
Another planet, HD 11343 c, was discovered in 2022 closer to HD 11343 A, also using the radial-velocity method. The planet is reportedly a Jupiter analog, larger than the previous planet but likely considerably less massive, with a minimum mass of 0.804 MJ. It orbits its star at a distance of 0.923 AU (138,100,000 km) every 228.5 days (0.626 years). Due to the faintness of the astrometric signals it produces, its orbital inclination cannot be well-constrained. The discovery paper for HD 11343 c notably presents a higher mass (7.71+0.73
−1.19 MJ), semi-major axis (3.729 AU), orbital period (5.07 years), and eccentricity (0.360) for HD 11343 b.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| c | ≥0.804 MJ | 0.923 +0.019 −0.022 |
228.5 +3.3 −3.8 |
0.169 +0.142 −0.102 |
— | ~1.24[11] RJ |
| b | 5.7 +1.2 −1.1 MJ |
2.80 +0.21 −0.25 |
1585 +27 −40 |
0.122 +0.060 −0.067 |
73.0 +12.0 −16.0° |
~1.13[12] RJ |
Footnotes
edit- ^ Calculated from star's luminosity.
References
edit- ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c d e f g "HD 11343". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 September 2024.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f Xiao, Guang-Yao; et al. (1 May 2023). "The Masses of a Sample of Radial-velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics. 23 (5): 055022. arXiv:2303.12409. doi:10.1088/1674-4527/accb7e. ISSN 1674-4527.
- ^ a b c d Feng, Fabo; Butler, R. Paul; Vogt, Steven S.; Clement, Matthew S.; Tinney, C. G.; Cui, Kaiming; Aizawa, Masataka; Jones, Hugh R. A.; Bailey, J.; Burt, Jennifer; Carter, B. D.; Crane, Jeffrey D.; Dotti, Francesco Flammini; Holden, Bradford; Ma, Bo; Ogihara, Masahiro; Oppenheimer, Rebecca; O’Toole, S. J.; Shectman, Stephen A.; Wittenmyer, Robert A.; Wang, Sharon X.; Wright, D. J.; Xuan, Yifan (1 September 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (1): 21. arXiv:2208.12720. doi:10.3847/1538-4365/ac7e57. ISSN 0067-0049.
This article incorporates text from this source, which is available under the CC BY 4.0 license.
- ^ a b c d e f g Jones, M. I.; et al. (2016). "Four new planets around giant stars and the mass-metallicity correlation of planet-hosting stars". Astronomy & Astrophysics. 590: A38. arXiv:1603.03738. doi:10.1051/0004-6361/201628067. ISSN 0004-6361.
- ^ a b c d e Stassun, Keivan G.; et al. (1 October 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
- ^ Zarenski, Ed (2004). "Limiting Magnitude in Binoculars" (PDF). Cloudy Nights. Archived (PDF) from the original on 21 July 2011. Retrieved 6 May 2011.
- ^ El-Badry, Kareem; Rix, Hans-Walter; Heintz, Tyler M (20 July 2021). "A million binaries from Gaia eDR3: sample selection and validation of Gaia parallax uncertainties". Monthly Notices of the Royal Astronomical Society. 506 (2): 2269–2295. arXiv:2101.05282. doi:10.1093/mnras/stab323. ISSN 0035-8711.
- ^ "HIP 8541 Overview". NASA Exoplanet Archive. Retrieved 21 September 2024.
- ^ "HD 11343 c - NASA Science". Retrieved 21 September 2024.
- ^ "HIP 8541 b - NASA Science". Retrieved 21 September 2024.
External links
edit- HD 11343 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- Extrasolar Planets Encyclopaedia links: HD 11343 b, c