Discovery of a “hot” planet He welcomes a new year every 22 days

An international team of astronomers announced the discovery of a new “hot Jupiter” exoplanet. It orbits a rapidly rotating F-type star.

The newly discovered alien world, called TOI-4641 b, may be four times larger than Jupiter in our solar system.

"The farthest man-made object from Earth" It broadcasts a mysterious message from space

In general, the "hot buyer" category is One of the gas giant planets with orbital periods ranging from 10 to 200 days. This makes them difficult targets for transit detection (a photometric method used to search for exoplanets) and radial velocity tracking studies.

Now, a group of astronomers led by Alison Perella of the Harvard-Smithsonian Center for Astrophysics (CfA) has found a new “hot Jupiter” exoplanet.

Using NASA's Transiting Exoplanet Survey Satellite (TESS), which scans the entire sky in search of transiting extrasolar worlds, astronomers identified a transit signal in the light curve of TOI-4641, a bright, rapidly rotating F-type star, with a Rotation speed is about 86.3 km/s. The planetary nature of this signal was confirmed through optical and spectroscopic follow-ups.

According to a research paper published by arXiv magazine, the radius of the newly discovered planet is about 0.73 the radius of Jupiter, and its maximum mass was calculated at 3.87 Jupiter’s masses.

Observations indicate that TOI-4641 b orbits its host star every 22.09 days in a well-aligned orbit, at a distance equivalent to approximately 0.173 astronomical units from it. Thus, TOI-4641 b is among the longest-orbiting planets orbiting a hot, rapidly rotating star.

The parent star TOI-4641 (also known as TIC 436873727) is located about 286 light-years away, and has a radius of about 1.72 solar radii, which is approximately 41% larger than our Sun.

The star is estimated to be 2.69 billion years old, has a metallicity of -0.09, and has been found to have an effective temperature of 6560 K (6286 degrees Celsius).

Scientists emphasized that long-orbiting exoplanets like TOI-4641 b could be crucial for testing the mechanisms that induce primordial misalignment in planetary systems, given that at such orbital distances, tidal star-planet interactions are assumed to be too weak to modify the tilt. Orbital.

“Testing these predictions stimulates the full characterization of planets in long-period orbits around early-type stars,” the scientists concluded.

Overall, Perella's team proposes some mechanisms behind this misalignment, including chaotic accretion, magnetic buckling, or changes in the rotation axes of early stars, as well as companion stars or planets during the primitive stage of formation.

European Union countries have thrown more than two hundred million doses of anti-coronavirus vaccines worth four billion euros into landfills, Politico reported.

The newspaper stated in a publication: “At least 215 million doses of Covid-19 vaccines purchased by European Union countries were discarded.” At the height of the epidemic, this cost taxpayers four billion euros.

The newspaper indicated that European Union countries generally obtained one and a half billion vaccine doses, but many of them ended up “in landfills across the continent.”

According to information reported by Politico, vaccines were mainly purchased during the peak of the epidemic in 2021, but the matter continued even after infection rates began to decline, and attempts to transfer the surplus to third countries failed due to low demand and logistical problems.