To date, astronomers have confirmed the existence of 5638 extrasolar planets in 4,199 star systems. In the process, scientists have found many worlds that have defied expectations. This is certainly the case regarding \u201chot Neptunes,\u201d planets that are similar to the \u201cice giants\u201d of the outer Solar System but orbit much closer to their stars. But when a Johns Hopkins University-led team of astronomers discovered TIC365102760 b (aka. Pheonix), they observed something entirely unexpected: a Neptune-sized planet that retained its atmosphere by puffing up.<\/p>\n
<\/p>\n Sam Grunblatt, an astrophysicist with JHU\u2019s William H. Miller III Department of Physics and Astronomy, led the research. He was joined by an international team that included NSF Graduate Research Fellow Nicholas Saunders, 51 Pegasi b Fellows Shreyas Vissapragada, Steven Giacalone, Ashley Chontos, and Joseph M. Akana Murphy, as well as researchers from many prestigious institutes and universities. The paper that describes their findings (which recently appeared in The Astrophysical Journal<\/em>) is part of a series titled \u201cTESS Giants Transiting Giants.\u201d<\/p>\n Puff planets are a new class of incredibly rare exoplanets, accounting for an estimated 1% of planets in our galaxy. The team discovered Pheonix by combining data from the Transiting Exoplanet Survey Satellite (TESS) with radial velocity measurements obtained by the High Resolution Echelle Spectrometer (HIRES) at the Keck Observatory. Their data indicated that Pheonix is 0.55 times the size of Jupiter but only 0.06 times as massive, which orbits a red giant star with a period of 4.21285 days (about six times closer to its star than the distance between Mercury and the Sun). <\/p>\n Based on the age and temperature of its star and the planet\u2019s remarkably low density, the team expected that Pheonix\u2019s gaseous envelopes should have been stripped away billions of years ago. Based on its density, the team also estimates that the planet is the puffiest \u201cpuff planet\u201d discovered to date (roughly 60 times less dense than the densest \u201chot Neptune\u201d) and that it will begin spiraling into its star in about 100 million years. As Grunblatt explained in a JHU HUB press release:<\/p>\n \u201cThis planet isn\u2019t evolving the way we thought it would. It appears to have a much bigger, less dense atmosphere than we expected for these systems. How it held on to that atmosphere despite being so close to such a large host star is the big question.\u201d<\/p>\n<\/blockquote>\n \u201cIt\u2019s the smallest planet we\u2019ve ever found around one of these red giants, and probably the lowest mass planet orbiting a [red] giant star we\u2019ve ever seen. That\u2019s why it looks really weird. We don\u2019t know why it still has an atmosphere when other \u2018hot Neptunes\u2019 that are much smaller and much denser seem to be losing their atmospheres in much less extreme environments.\u201d<\/p>\n<\/blockquote>\n These findings could have implications for new insight into the late-stage evolution of planetary systems and help scientists predict what will happen to the Solar System in a few billion years. According to standard models of stellar evolution, our Sun will exit its main sequence phase, expand to become a red giant, and eventually consume the inner planets. Based on these findings, they predict that Earth\u2019s atmosphere may not evolve the way astronomers previously expected. Instead of our Sun blasting it away, our atmosphere may expand to become incredibly \u201cpuffy.\u201d<\/p>\n Pheonix is the latest puffy planet examined by the international team based on TESS data. While puff planets are known to be rare, exoplanets like Pheonix are especially elusive because of their small size and low density. In the future, Grunblatt and his colleagues plan to search for more of these smaller worlds and have already identified a dozen potential candidates by combining transit and radial velocity data. <\/p>\n Further Reading: John Hopkins University, The Astrophysical Journal<\/em><\/p>\n\n
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