Astronomy:HD 11343

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Short description: K-type giant star in the constellation Eridanus
HD 11343
Location of HD 11343 (circled)
Observation data
Equinox J2000.0]] (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[2] mas
Distance502 ± 1 ly
(153.9 ± 0.4 pc)
Absolute magnitude (MV)+1.77[1]
Orbit
PrimaryHD 11343 A
CompanionHD 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, TYC 8482-1124-1, GSC 08482-01124, 2MASS J01500631-5427539[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

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 Astronomy:astronomical unit|astronomical units (0.041 ly) from its brighter companion.[7][10]

Planetary system

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

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 Høg, E. (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. doi:10.1051/0004-6361/201117887. ISSN 0004-6361. Bibcode: 2011A&A...536A..71J. 
  5. ↑ Houk, Nancy (1975). Michigan catalogue of two-dimensional spectral types for the HD stars. 1. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode: 1975MSS...C01....0H. 
  6. ↑ 6.0 6.1 6.2 6.3 "HD 11343". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+11343. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 Xiao, Guang-Yao et al. (2023-05-01). "The Masses of a Sample of Radial-velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics 23 (5): 055022. doi:10.1088/1674-4527/accb7e. ISSN 1674-4527. Bibcode: 2023RAA....23e5022X. 
  8. ↑ 8.0 8.1 8.2 8.3 Feng, Fabo; Butler, R. Paul; Vogt, Steven S.; Clement, Matthew S.; Tinney, C. G.; Cui, Kaiming; Aizawa, Masataka; Jones, Hugh R. A. et al. (2022-09-01). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (1): 21. doi:10.3847/1538-4365/ac7e57. ISSN 0067-0049. Bibcode: 2022ApJS..262...21F.  This article incorporates text from this source, which is available under the CC BY 4.0 license.
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 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. doi:10.1051/0004-6361/201628067. ISSN 0004-6361. Bibcode: 2016A&A...590A..38J. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 10.5 10.6 Stassun, Keivan G. et al. (2019-10-01). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  11. ↑ Zarenski, Ed (2004). "Limiting Magnitude in Binoculars". Cloudy Nights. http://www.cloudynights.com/documents/limiting.pdf. 
  12. ↑ El-Badry, Kareem; Rix, Hans-Walter; Heintz, Tyler M (2021-07-20). "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. doi:10.1093/mnras/stab323. ISSN 0035-8711. Bibcode: 2021MNRAS.506.2269E. 
  13. ↑ "HD 11343 c - NASA Science". https://science.nasa.gov/exoplanet-catalog/hd-11343-c/. 
  14. ↑ "HIP 8541 b - NASA Science". https://science.nasa.gov/exoplanet-catalog/hip-8541-b/. 



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