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HD 28254 b

Summary

HD 28254 b (also known as HIP 20606 b) is an exoplanet which orbits the G-type main sequence star HD 28254, located 180 light-years away in the constellation Dorado.

HD 28254 b
Discovery[1]
Discovered byNaef et al.
Discovery siteLa Silla Observatory
Discovery dateOctober 19, 2009
radial velocity (HARPS)
Orbital characteristics[2]
Apastron4.78 AU
Periastron0.12 AU
2.45+0.03
−0.04 AU
Eccentricity0.95+0.03
−0.04
1,333±4 d
3.65±0.01 yr
Inclination21°+38°
−11° or 162°+7°
−27°
248°+53°
−33° or 163°+38°
−36°
2,454,246+9
−10 JD
289°+20°
−18°
Semi-amplitude37.3+5.1
−0.9 m/s[1]
StarHD 28254
Physical characteristics
Mass3.8+3.0
−2.2 MJ[2]
Temperature207+13
−40 K[citation needed]

Discovery edit

The planet was discovered in a survey by HARPS along with 29 other planets in 2009.[1]

Properties edit

Due to the planet's high mass, it is assumed to be a gas giant like Jupiter. Since HD 28254 b was detected indirectly, properties such as its inclination, radius, and temperature are unknown. HD 28254 takes about 3 years to orbit its host and has one of the most eccentric orbits around a star. In 2023, the inclination and true mass of HD 28254 b were measured via astrometry, though the mass remains uncertain - it is between about 1.6 and 6.8 times the mass of Jupiter.[2]

References edit

  1. ^ a b c Naef, Dominique; Mayor, Michel; Lo Curto, Gaspare; Bouchy, François; Lovis, Christophe; Moutou, Claire; Benz, Willy; Pepe, Francesco; Queloz, Didier; Santos, Nuno C.; Ségransan, Damien; Udry, Stéphane; Bonfils, Xavier; Delfosse, Xavier; Forveille, Thierry; Hébrard, Guillaume; Mordasini, Christoph; Perrier, Christian; Boisse, Isabelle; Sosnowska, Danuta (2010). "The HARPS Search for Southern Extrasolar Planets XXIII. 8 Planetary Companions to Low-activity Solar-type Stars". Astronomy and Astrophysics. 523: A15. arXiv:1008.4600. Bibcode:2010A&A...523A..15N. doi:10.1051/0004-6361/200913616. S2CID 118845989.
  2. ^ a b c Philipot, F.; Lagrange, A.-M.; et al. (October 2023). "A multi-technique approach to identifying and/or constraining radial-velocity substellar companions". Astronomy & Astrophysics. 678: A107. arXiv:2308.05417. Bibcode:2023A&A...678A.107P. doi:10.1051/0004-6361/202346612. S2CID 260775968.