HD 143811

Last updated
HD 143811
HD 143811 AB b Gemini Planet Imager.png
HD 143811 AB b (arrow) with Gemini in 2019. The star is behind the black disk of the coronagraph in the center.
Observation data
Epoch J2000       Equinox J2000
Constellation Lupus [1]
Right ascension 16h 03m 33.425s [2]
Declination −30° 08′ 13.38″ [2]
Apparent magnitude  (V)+8.91±0.01 [3]
Characteristics
Spectral type F5V [4]
Astrometry
Radial velocity (Rv)+0.48±0.02 [5] km/s
Proper motion (μ)RA: −14.850 mas/yr [2]
Dec.: −24.984 mas/yr [2]
Parallax (π)7.3065±0.0204  mas [2]
Distance 446 ± 1  ly
(136.9 ± 0.4  pc)
Orbit [5]
Period (P)18.59098(7) days
Semi-major axis (a)0.1854+0.0014
−0.0024  au
Eccentricity (e)0.4935±0.0013
Inclination (i)22.9+0.3
−0.2°
Periastron epoch (T)58230.438±0.006 MJD
Argument of periastron (ω)
(secondary)		335.91±0.18°
Argument of periastron (ω)
(primary)		155.91±0.18°
Semi-amplitude (K1)
(primary)		22.76±0.05 km/s
Semi-amplitude (K2)
(secondary)		25.71±0.06 km/s
Details [5]
A
Mass 1.30+0.03
−0.05  M☉
Temperature 6,751+207
−148  K
Metallicity [Fe/H]−0.18±0.10  dex
Rotational velocity (v sin i)6.8±0.6 km/s
Age 20.9+1.8
−1.7  Myr
B
Mass 1.15+0.03
−0.04  M☉
Temperature 6,349+122
−133  K
Metallicity [Fe/H]−0.18±0.10  dex
Rotational velocity (v sin i)2.8±1.4 km/s
Age 20.9+1.8
−1.7  Myr
Other designations
CD−29°12217, HD 143811, HIP 78663, TYC 7330-289-1 [6]
Database references
SIMBAD data

HD 143811 is a spectroscopic binary [7] system in the constellation Lupus. Its apparent magnitude is 8.91, too faint to be visible with the naked eye. Based on parallax measurements from the Gaia spacecraft, it is located at a distance of 446 light-years (137 parsecs ).

The system is a member of the Scorpius–Centaurus association, and has an estimated age of 21 million years. The two stellar components are a bit more massive and hotter than the Sun. They take 18.59 days to orbit each other, and have an unusually eccentric orbit for such a short orbital period. [5] HD 143811 has a debris disk located at 8.5  astronomical units, with an estimated temperature of 140 K (−133 °C), [8] and is orbited by one known exoplanet, at 63 au. [7]

Planetary system

In 2025, two independent teams found a planet orbiting the system using the direct imaging technique. One used the Gemini Planet Imager and the NIRC-2 camera aboard the Keck telescope, [9] while the other used the SPHERE instrument aboard the Very Large Telescope and the Gemini Planet Imager. [7] Additionally, its existence was inferred using astrometry. [7] The planet, named HD 143811 b, is a gas giant with 6.1 times the mass of Jupiter (MJ), [7] 1.4 to 1.7 times Jupiter's radius (RJ), [9] and a temperature of 1,000±30  K . It has a circumbinary orbit, having a semi-major axis of 63 astronomical units, and an orbital period of roughly 300 years. [7]

The HD 143811 planetary system [7]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(years)		 Eccentricity Inclination Radius
b6.1+0.7
−0.9  MJ 		63+30
−12		319+248
−86		0.19±0.1237+11
−12 ° 		1.41±0.03 –1.7+0.7
−0.4 [9]   RJ

References

  1. ↑ 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 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. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
  4. ↑ Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Bibcode:1982mcts.book.....H.
  5. 1 2 3 4 Peck, Anne E.; Roberson, William; Nielsen, Eric L.; Rosa, Robert J. De; Jones, Nathalie; Wang, Jason; Macintosh, Bruce; Lewis, Bailey L.; Duchêne, Gaspard (2025-09-08). "Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b". arXiv: 2509.06727 [astro-ph.EP].
  6. ↑ "HD 143811". SIMBAD . Centre de données astronomiques de Strasbourg.
  7. 1 2 3 4 5 6 7 Squicciarini, Vito; Mazoyer, Johan; Wilkinson, Christian; Lagrange, Anne-Marie; Delorme, Philippe; Radcliffe, Alice; Flasseur, Olivier; Kiefer, Flavien; Alecian, Evelyne (2025-09-07). "GPI+SPHERE detection of a 6.1MJup circumbinary planet around HD 143811". arXiv: 2509.06009 [astro-ph.EP].
  8. ↑ Cotten, Tara H.; Song, Inseok (2016-07-25). "A Comprehensive Census of Nearby Infrared Excess Stars". The Astrophysical Journal Supplement Series. 225 (1): 15. arXiv: 1606.01134 . Bibcode:2016ApJS..225...15C. doi: 10.3847/0067-0049/225/1/15 . ISSN   0067-0049.
  9. 1 2 3 Jones, Nathalie K.; Wang, Jason J.; Nielsen, Eric L.; Rosa, Robert J. De; Peck, Anne E.; Roberson, William; Ruffio, Jean-Baptiste; Xuan, Jerry W.; Macintosh, Bruce A. (2025-09-08). "HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen". arXiv: 2509.06729 [astro-ph.EP].
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.