HD 7449


HD 7449 is a binary star system about way. The primary star, HD 7449 A, is a main-sequence star belonging to the spectral class F9.5. It is younger than the Sun. The primary star is slightly depleted of heavy elements, having 80% of solar abundance.

Companion

The stellar companion HD 7449 B, belonging to spectral class M4.5, was discovered in 2015. A survey in 2017 has failed to find additional stars with masses above 0.35 in the system.
The most recent parameters for HD 7449 B as of 2022 come from a combination of data from radial velocity, astrometry, and imaging, showing that it is about, and orbiting with a semi-major axis of about 34.7 AU and an orbital period of about 175 years.

Planetary system

In 2011 one super-Jupiter-mass planet, on a very eccentric orbit around HD 7449 A was discovered utilising the radial velocity method. A second, long-term radial velocity trend is present, and a second planet or brown dwarf has been proposed as the cause of this trend. However, in 2015 a low-mass stellar companion was found, which is likely the cause of the long-term trend. The large eccentricity of the inner planet is likely caused by this stellar companion. In 2022, the inclination and true mass of HD 7449 Ab were measured via astrometry.