قالب وردپرس درنا توس
Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ ALMA reveals the lunar disk around the distant planet

ALMA reveals the lunar disk around the distant planet



  A color image of millimeter-wave radio signals from the ALMA Observatory in Chile shows a gas and dust disc (right of center) around the PDS 70 c exoplanet, the first - no observation of the type of circular a drive believed to have spawned the moons of Jupiter more than 4 billion years ago. (With the courtesy of A. Isella, ALMA (ESO / NAOJ / NRAO)) </p>
</div>
<p>  Using the most powerful mass spectrometer on Earth, astronomers have made the first observations of an encircled disk of gas and dust as the one believed to , that </p>
<p>  The find, published today in the Astrophysical Journal Letters, complements the intriguing history of the planet PDS 70 c, still forming a gas giant around 370 light-years from Earth, first revealed last month. in visible light images. </p>
<p>  Using Chile's massive 66-antenna Atacama Large Millimeter / Submillimeter Array (1<div class=
9459008) ALMA Rice University astronomer Andrea Isela and colleagues collected radio signals with millimeter waves revealing the presence of dust grains in the star system where PDS 70 c and its sister planet, PDS 70 b, are still being formed. so much is a wn disk as it collects material in its orbit around the star, "Isella said. "Jupiter and its moons are a little planetary system in our solar system, for example, and it is believed that the moons of Jupiter were formed by the circular disc when Jupiter was very young."

<img aria-describedby = "caption-attachment-58411" class = "size-large wp-image-58411" src = "https://scitechdaily.com/images/Moon-Forming-Disk-Discovered-777×534 .jpg "alt =" Radio astronomas using Atacama discovered A large millimeter / submillometer A telescope telescope in Chile found a gas and dust disk (left) around the exoplanet PDS 70 c, still forming a gas giant that was obscured from a point of view of the infrared image of 2018 (right), which first revealed its sister planet, PDS 70 b. (With the courtesy of A. Isella, ALMA (ESO / NAOJ / NRAO))

the planets show that the planets the discs disappear within about 10 million years, meaning that there were no discounters for more than 4 billion years in our solar system to look for them elsewhere and gather evidence to observe to test theories of formation the planets, Isela and colleagues are looking for many young stars where they can directly watch disks and planets that are still forming inside them. In the new study, Isella and colleagues analyzed the observations made by ALMA in 2017

"There are several candidate planets found in the discs, but this is a whole new field, and they are all still under discussion" said Aisella. "(PDS 70b and PDS 70c) are among the strongest because they have independent observations with various tools and techniques."

The PDS 70 is a dwarf star around three-quarters of the mass of the sun. Both planets are 5-10 times larger than Jupiter, and the innermost, the PDS 70 b, travels about 1.8 billion miles from the star, approximately the distance from the Sun to Uranus. PDS 70 c is a billion miles farther in orbit around the size of Neptune.

PDS 70 b was first unveiled in 2018 in infrared light images of a planet hunting tool called SPERA in the very large telescope of the European Southern Observatory. (VLT). In June, astronomers use another VLT instrument called MUSE to observe a visible wavelength of light known as H-alpha, which is emitted when hydrogen comes to a star or planet and becomes ionized. Alpha gives us more confidence that these are planets, as it suggests that they are still pumping gas and dust and growing up, "says Aisella.

ALMA's observations of millimeter wavelengths provide even more evidence.

Isela said the direct observation of planets with circular planes could allow astronomers to test the theories of the formation of the planet. about how the planets are formed, and now we finally have the tools to make direct observations and start answering questions about how our solar system is formed and how other planets can form. "[196590] 04] She is Assistant Professor of Physics and Astronomy and Earth Sciences, Ecology and Planetary Science at Rice and co-researcher of the CLEVER Planets project, funded by NASA.

The co-authors of the study include Myriam Benisty both at the University of Chile and at the University of Grenoble Alps, Richard Dee of the University of Michigan, Jaehan Bae of the Carnegie Institution for Science, Miriam Kepler of the Max Planck Astronomy Institute, Stefano Fachini from the European Southern Observatory and Laura Perez from Universidad de Chile.

The research was supported by the National Science Foundation, the French National Agency for Research, NASA, the Chilean National Science and Technology Research Commission, the Chilean National Science and Technology Development Fund, the European Horizon 2020 and the European Southern Observatory.


Source link