. Three newly discovered planets orbit dangerously close to the stars that are nearing the end.
These three extrasolar planets, among the many discovered, were first observed by NASA’s TESS (Transiting Exoplanet Survey Satellite Mission). They have the longest orbits around giant or subgiant stars and are therefore some of the most elusive. One of the planets, TOI-2337b, will be consumed by its host star in less than 1 million years, sooner than any other currently known planet.
” These discoveries are critical to understanding a new frontier exoplanet research: how planetary system evolve over time,” said Samuel Grunblatt (postdoctoral fellow at American Museum of Natural History in New York City) and lead author. Grunblatt, who received his PhD at the University of Hawai?i Institute for Astronomy, said that these observations “offer new windows into planets close to the end of their lives before their host star swallow them up.” “
Grunblatt announced the discovery and confirmation of these planets — TOI-2337b, TOI-4329b, and TOI-2669b — at an American Astronomical Society press conference today; the study has been accepted for publication in the Astronomical Journal.
The researchers believe that the planets are between 0.5 to 1.7 times Jupiter’s weight and have sizes that range from slightly smaller than Jupiter to over 1.6 times that of Jupiter. They have a wide range in densities, ranging from styrofoam like to three times more dense than water. This suggests that they may be of many origins.
These three planets are thought to be only the tip of an iceberg. Nick Saunders, a graduate student from UH IfA, co-author of this study, stated that “we expect to find tens of hundreds of these evolved transiting system planet systems with TESS,” adding that it will provide new details about how planets interact, inflate and migrate around stars including our Sun.”
The planets were discovered in NASA TESS Mission full frame image data in 2018, 2019.. Grunblatt and his collaborators identified the candidate planets in TESS data, and then used W. M. Keck Observatory’s High-Resolution Echelle Spectrometer (HIRES) on Maunakea, Hawai?i to confirm the ex