HD 81040 b

HD 81040 b

Radial velocity curve of HD 81040 b [1]
Discovery
Discovered by	Sozzetti et al. [2]
Discovery site	Observatoire de Haute-Provence in France
Discovery date	November 24, 2005
Detection method	Doppler Spectroscopy
Orbital characteristics
Semi-major axis	1.946 ± 0.014 AU (291,100,000 ± 2,100,000 km) [3]
Eccentricity	0.525+0.024 −0.026 [3]
Orbital period (sidereal)	1,004.7 ± 3.0 days (2.7507 ± 0.0082 years) [4]
Inclination	111.4°+4.4° −4.7° [4]
Longitude of ascending node	19.2°+5.0° −4.8° [4]
Time of periastron	245511.1+10 −8.7 [3]
Argument of periastron	73.1°±4.3° [4]
Semi-amplitude	168 ± 9 [2]
Star	HD 81040
Physical characteristics
Mass	7.53±0.032  MJ [4]

HD 81040 b is a massive gas giant exoplanet that orbits the star HD 81040, discovered in 2005 by radial velocity. ^[2] Its orbital period is just over 1000 days. It has a semimajor axis of about 1.95 AU, and its orbit is quite eccentric, at a little over 0.5. ^{[3] [4]}

Astrometry of HD 81040 using Gaia , published in several papers, has determined an orbital inclination of about 111°. This, combined with the minimum mass, gives a true mass of 7.53  M_J. ^{[3] [1] [5] [6] [4]} Since the inclination is high, there is a small chance that the planet transits. ^[3]

Astrometric orbit of HD 81040 b

See also

• HD 33564 b

References

1. "Image of the Week: Astrometric Orbit of the Exoplanet-Host Star HD81040". cosmos.esa.int. ESA/Gaia/DPAC/CU4-CU3. 31 January 2022. Retrieved 14 September 2022.
2. Sozzetti, A.; et al. (2006). "A massive planet to the young disc star HD 81040". Astronomy and Astrophysics. 449 (1): 417–424. arXiv: astro-ph/0511679 . Bibcode:2006A&A...449..417S. doi:10.1051/0004-6361:20054303. S2CID   7647622.
3. Li, Yiting; Brandt, Timothy D.; Brandt, G. Mirek; Dupuy, Trent J.; Michalik, Daniel; Jensen-Clem, Rebecca; Zeng, Yunlin; Faherty, Jacqueline; Mitra, Elena L. (2021). "Precise Masses and Orbits for Nine Radial-velocity Exoplanets". The Astronomical Journal. 162 (6): 266. arXiv: 2109.10422 . Bibcode:2021AJ....162..266L. doi: 10.3847/1538-3881/ac27ab . S2CID   237592581.
4. Winn, Joshua N. (September 2022). "Joint Constraints on Exoplanetary Orbits from Gaia DR3 and Doppler Data". The Astronomical Journal. 164 (5): 196. arXiv: 2209.05516 . Bibcode:2022AJ....164..196W. doi: 10.3847/1538-3881/ac9126 . S2CID   252211643.
5. Gaia Collaboration; et al. (2023). "Gaia Data Release 3". Astronomy & Astrophysics. 674: A34. arXiv: 2206.05595 . doi:10.1051/0004-6361/202243782. S2CID   249626026.
6. Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series . 262 (21): 21. arXiv: 2208.12720 . Bibcode:2022ApJS..262...21F. doi: 10.3847/1538-4365/ac7e57 . S2CID   251864022.