New multi-planet system discovered in our galaxy

New multi-planet system discovered in our galaxy

MIT

Using NASA’s Exoplanet Survey Satellite (TESS) satellite, MIT astronomers have discovered a new multi-planet system near our galaxy.

The system hosts at least two Earth-sized planets about 33 light-years away. It is one of the closest known multi-planetary systems to our own.

At the heart of the system is a small cold M dwarf called HD 260655.planets in the system may not be habitable The temperature is too high to maintain liquid water on the surface due to their relatively compact orbits.

Scientists are excited about the system because the proximity and brightness of its star will allow them to better understand the properties of the planets and the signature of any atmospheres they may contain.

“Both planets in this system are considered optimal targets for atmospheric research because your star shines. Are there volatile-rich atmospheres around these planets? Are there signs of water-based or carbon-based species? These planets are great testbeds for these explorations,” said Michelle Kunimoto of MIT’s Caffrey Institute for Astrophysics and Space Research.

The system was discovered in October 2021 while Kunimoto was monitoring incoming satellite data from the HD 260655 star.

After several detections, these signals were quickly classified into two TESS objects of interest, or TOIs.In general, the process of classification and subsequent confirmation of new planets it may take a few years. For HD 260655, this process is greatly shortened with the help of file data.

After identifying two potential Earth-sized planets around HD 260655, astronomers set out to see if other telescopes had already identified the system. The High-Resolution Echelon Spectrometer (HIRES) lists the system in its stellar survey, and it was also recorded by CARMENES.

To ensure that the signals received from TESS were actually from the two orbiting planets, the scientists examined data from HIRES and CARMENES.

two withdrawals Measuring gravitational oscillations The speed of a star, also known as its radial velocity, Tech Explorist reports.

“Each planet orbiting a star has a small gravitational pull on its star. We’re looking for any slight motion in that star that could indicate a planetary-mass object is pulling,” Kunimoto said.

The scientists found statistically significant signs that those detected by TESS were indeed two orbiting planets.

They then looked more closely at the data to determine the properties of the two planets — their orbital periods and sizes.

They found that the inner planet, named HD 260655b, orbits the star every 2.8 days, approximately 1.2 times bigger than EarthThe second exoplanet, HD 260655c, orbits every 5.7 days and is 1.5 times larger than Earth.

The scientists also calculated the planets’ masses, which are directly related to how much each planet orbits its star.

They found that the inner planet is about twice the mass of Earth, while the outer planet is about three times the mass of Earth.

The team calculated the density of each planet based on its size and mass.smaller inner planets denser than earth, while larger exoplanets are slightly less dense. Depending on their densities, both planets could be terrestrial or rocky.

Based on their short orbits, the inner planet’s surface is 710 Kelvin, while the outer planet’s surface is about 560 Kelvin.

“We think the range outside the habitable zone is too hot for liquid water to exist at the surface,” Kunimoto noted.

“But there may be more planets in the system. Many multi-planet systems have five or six planets, especially around small stars like this. We hope to find more, and a possibly habitable. This is optimistic thinking. “

Zapp //

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