A warm planet where the year lasts 22 days has been discovered near Earth.

A team of astronomers led by CfA’s Alison Birilla has discovered a new exoplanet: warm Jupiter. Astronomers from the Harvard-Smithsonian Center for Astrophysics (CfA) and other countries have discovered a new exoplanet, warm Jupiter. The star orbits a rapidly rotating F-type star and is named TOI-4641 b. This exoplanet has almost four times the mass of Jupiter. The research results were published on the preprint server arXiv. Generally, warm Jupiter is a giant planet with an orbital period of 10 to 200 days. This makes them difficult targets for transit detection and subsequent radial velocity studies compared to planets with short orbits (hot Jupiters).

Using the Transiting Exoplanet Survey Satellite (TESS), which scans the entire sky in search of transiting exoplanets, scientists can detect bright, rapidly rotating F stars (with predicted rotational speeds) A passing signal was detected in the light curve of TOI-4641. ). Approximately 86.3km/sec). The planetary nature of this signal was confirmed by subsequent photometric and spectroscopic observations. It turns out that a year on Earth is only 22.09 days. Its radius is about 0.73 that of Jupiter, and its maximum mass is 3.87 that of the gas giant. According to observations, TOI-4641 b orbits its parent star in a well-aligned orbit at a distance of approximately 0.173 astronomical units (one astronomical unit is the distance from the Earth to the sun).

The parent star of TOI-4641 (also known as TIC 436873727) is only 286 light-years from Earth, making it a fairly close cosmological distance. Its radius is about 1.72 times the solar radius and it is about 41% more massive than our star. Her age is estimated at 2.69 billion years, and her effective temperature is 6,560 Kelvin (6,286.85°C). The authors emphasized that long-period exoplanets like TOI-4641 b could be important for testing the mechanisms that cause the initial drift of planetary systems. At such orbital distances, the tidal interaction between the star and the planet would be too weak to change the orbital inclination.

source: https://arxiv.org/abs/2312.03971