![]() “Although this satellite was born with the main objective of detecting planets the size of the Earth, its capabilities provide a unique opportunity to investigate in many other fields of astrophysics”. “The TESS data have also allowed us to analyze other intrinsic characteristics of the stars themselves, such as the frequencies of their pulsations or their rotation, something that we have been able to see in two of the stars in the sample (NGC 246 and RWT 152)”, indicates Sebastià Barceló Forteza, also a CAB researcher and co-author of the study. The period of this signal is 2.8 days, which would be, if that companion star is confirmed, the time in which both would orbit around each other ”. This variability could be consistent with the presence of a low-mass companion star or substellar object (such as a brown dwarf or exoplanet), which could be reflecting light from the much hotter primary star. This nebula is one of the most studied and also one of the closest to Earth, located about 650 light years away.Īs Aller explains: “Thanks to the TESS data, we detected, for the first time, a clear variability in the light that reaches us from its central star, what we call the light curve. Of special interest are the results obtained for the Helix Nebula or NGC 7293, also popularly known as the Eye of God or the Eye of Sauron (from the Lord of the Rings). In the center of the eye of God or Sauron “And the eighth, which does not seem to have variability at least in the 27 days in which the data have been taken, it is the only apparently spherical planetary nebula in the sample, something that would corroborate the binarity theory ”. “Of the eight central stars of planetary nebulae analyzed, seven show clear signs of variability, compatible in most cases with the presence of a companion star,” says Aller. Now, a study led by Alba Aller Egea, a researcher at the Center for Astrobiology (CAB, CSIC-INTA) and published in the journal Astronomy & Astrophysics, has used data from the TESS space telescope (Transiting Exoplanet Survey Satellite, exoplanet search satellite in transit) to detect binary stars in the nucleus of several planetary nebulae. Therefore, the detection of more double stars is essential for the in-depth study of this phase of the life of stars like the Sun. However, this binarity hypothesis does not yet have clear observational evidence since, to date, only about 60 central binary stars of planetary nebulae have been detected. The fascinating morphologies observed seem to indicate asymmetries during the star’s mass loss process, something that could be the result of binary interactions, that is, of the central star with another companion star. 80% of them present complex morphologies, very difficult to explain with the basic model of planetary nebula formation, which would give rise to rather spherical nebulae. Today we know of more than 3,000 planetary nebulae in our galaxy. ![]() ![]() ![]() Almost all the stars in the universe will end their lives like this. Within another 5,000 million years its size will increase until it almost reaches the orbit of Mars, expelling the outer layers of its atmosphere and forming what is known as a planetary nebula, which will end up dissipated in the stellar medium. Our Sun, with an approximate age of 4,500 million years, is in the middle of its life. If there isn't anything on screen and the player shakes their remote, their Mii will slip.Arp 87: Merging Galaxies from Hubble Image Credit: NASA, ESA, Hubble Space Telescope Processing: Douglas Gardner.In Spot the Sneak, the Sneak's Wii Remote will rumble to forewarn them about the woman being next. They must not hit the cutout of a woman or they will lose 5 points. The player(s) must swing their Wii Remote(s) fast to get the most points, with 5 going to the first player to hit, then 3 going to the second player to hit, and so on. ![]()
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