Tuesday , August 9 2022

A New Star List shows us where to look for earth-like planets


Artist's concept of TESS hunting for extrapolations.
Illustration: NASA / Cornell University

Astronomers have created a catalog of 1,822 nearby stars that the Exoplanet Transfer Survey (TESS) Satellite mission may notice planets receiving similar levels of Earth stars. This is a vital step in the search for humanity for an extrapolation similar to Earth, which can be lived in.

Whether life exists elsewhere and what it is like, and whether there are other living planets more generally, is a matter of continuing importance to humanity. It's going to take a long time to answer that question. But an important first step is to find out where to look. That's what this newspaper is doing.

“We have identified the stars where TESS can search for Earth-like planets,” said Lisa Kaltenegger, associate professor of astronomy from Cornell University, told Gizmodo.

For these 1,822 stars, TESS is sufficiently sensitive to detect planets as small as twice the radius of the Earth receiving radiation levels similar to that hitting the Earth. From those stars, TESS could find planets as small as 1.6 Earth radii for 1,690 of them, and one radius of the Earth for 408, according to the paper published in The Astrophysical Journal. And for 227 of those stars, TESS can search for planets in the full size of their living zone – what people regard as a Goldilocks zone for life, where liquid water can be stuck on the surface of the rocky planet.

NASA TESS was launched less than a year ago with a bold mission: to survey the nearby gactic neighborhood for stars with their own planets. It has already found its first extrapolation. TESS is looking for star lights that are spoiled from time to time, suggesting a planet that turns. An important subset of those planets is the Earth-like outputs in living zones. Kaltenegger and his colleagues combine data from TESS with data from Gaia satellite, a huge catalog of nearby stars, to produce the latest list. They calculated the live zones of these stars based on the amount of stellar radiation planets would have on increasing distances from their host stars.

This is an important list. “As TESS will watch almost all the air, literally there are millions of stars that we will need to score for planetary signals. “Having any way to prioritize which stars to look first, or closer, is extremely useful. This list is the first stab in which of these stars could host planets that could be resident, which would also be evident in the TESS data, so our list is very exciting to They won't get it. ”

There are limitations – many of these stars would only show a single planetary passage during the observation period, leaving much room for errors and more follow-up work required. In addition, these are not Sunshine-like stars. According to the paper, “almost all of our selected sample includes cold dwarf stars,” such as TRAPPIST-1 or Proxima Centauri. “Rocky planets are easier to find around smaller stars, and most of the stars in this catalog are cold, red stars (Mc Corrach),” says Christiansen. “In terms of consistency, there are still open questions as to whether the high energy (UV) radiation emitted by the M spiders during their numerous flames would sterilize any rocky planets that are exposed; n evict them. ”

Astronomers should certainly look, of course. Ultimately, it will be responsible for subsequent journeys such as the James Webb Space Telescope and future trips such as HabEx or LUVOIR to confirm whether these planets can actually sustain life. But if you're looking for Earth-like outlets, understanding what your telescope can do and cataloging the stars that could sustain these planets is a vital step.

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