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HD 11343

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HD 11343
Location of HD 11343 (circled)
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Eridanus[1]
Right ascension 01h 50m 06.33044s[2]
Declination −54° 27′ 53.8624″[2]
Apparent magnitude (V) 7.88[3]
Characteristics
Evolutionary stage Red giant branch[4]
Spectral type K2III/IV[5]
B−V color index 1.10[6]
J−H color index 0.556[6]
J−K color index 0.722[6]
Astrometry
Radial velocity (Rv)+6.92±0.12[2] km/s
Proper motion (μ) RA: 110.617[2] mas/yr
Dec.: −46.798[2] mas/yr
Parallax (π)6.4964±0.0156 mas[2]
Distance502 ± 1 ly
(153.9 ± 0.4 pc)
Absolute magnitude (MV)+1.77[1]
Orbit
PrimaryHD 11343 A
NameHD 11343 B
Semi-major axis (a)~2600 AU[7]
Details
HD 11343 A
Mass1.17±0.28[7] / 2.009±0.115[8] M☉
Radius7.83±1.02[9] R☉
Luminosity25.1+5.8
−5.6[9] L☉
Surface gravity (log g)2.70±0.20[7] cgs
Temperature4,670±100[7] K
Metallicity [Fe/H]−0.15±0.08[7] dex
Rotational velocity (v sin i)1.3±0.9[9] km/s
HD 11343 B
Mass0.680+0.078
−0.083[10] M☉
Radius0.698+0.062
−0.060[10] R☉
Luminosity0.157[10] L☉
Surface gravity (log g)4.58+0.11
−0.09[10] cgs
Temperature4,351+142
−113[10] K
Other designations
CD−55 412, CPD−55 351, GC 2232, HD 11343, HIP 8541, SAO 232538, PPM 331373, TIC 231019255, TYC 8482-1124-1, GSC 08482-01124, 2MASS J01500631-5427539, Gaia DR3 4912062772547406976[6]
Database references
SIMBADdata

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.

Stellar characteristics

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The HD 11343 system has an apparent magnitude of 7.88,[3] making it too faint to be visible by the naked eye from Earth under most circumstances, but can be observed using binoculars[11] 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☉[8]), 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.[9]

During a 2021 survey[12] searching for binaries within data from Gaia DR3, 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.[7][10]

Planetary system

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In 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.[9] This planet, HD 11343 b, is estimated to be slightly larger than Jupiter and has a mass of 5.7 MJ,[7] close to the initially estimated minimum of 5.5 MJ.[9] 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.[9]

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.[8]

The HD 11343 A planetary system[8][7]
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[13] 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[14] RJ

References

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  1. 1 2 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 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.
  3. 1 2 Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  4. ↑ Jones, M. I.; Jenkins, J. S.; Rojo, P.; Melo, C. H. F. (December 2011). "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets: I. Sample definition and physical properties". Astronomy & Astrophysics. 536: A71. arXiv:1110.6459. Bibcode:2011A&A...536A..71J. doi:10.1051/0004-6361/201117887. ISSN 0004-6361.
  5. ↑ Houk, Nancy (1975). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 1. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1975MSS...C01....0H.
  6. 1 2 3 4 "HD 11343". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 September 2024.
  7. 1 2 3 4 5 6 7 8 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. Bibcode:2023RAA....23e5022X. doi:10.1088/1674-4527/accb7e. ISSN 1674-4527.
  8. 1 2 3 4 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. Bibcode:2022ApJS..262...21F. 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.
  9. 1 2 3 4 5 6 7 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. Bibcode:2016A&A...590A..38J. doi:10.1051/0004-6361/201628067. ISSN 0004-6361.
  10. 1 2 3 4 5 6 7 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. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
  11. ↑ Zarenski, Ed (2004). "Limiting Magnitude in Binoculars" (PDF). Cloudy Nights. Archived (PDF) from the original on 21 July 2011. Retrieved 6 May 2011.
  12. ↑ 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. Bibcode:2021MNRAS.506.2269E. doi:10.1093/mnras/stab323. ISSN 0035-8711.
  13. ↑ "HD 11343 c - NASA Science". Retrieved 21 September 2024.
  14. ↑ "HIP 8541 b - NASA Science". Retrieved 21 September 2024.
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