The planets around NN Serpentis: still there. Discovery of a candidate for the coolest known brown dwarf. The orbital evolution of gas giant planets around giant stars. The NASA Exoplanet Archive: data and tools for exoplanet research.

Instead, our findings for the WDВ 1856+534 system indicate that giant planets can be scattered into tight orbits without being tidally disrupted, motivating the search for smaller transiting planets around white dwarfs.ДЄkeson, R. In this case, however, the long orbital period (compared with other white dwarfs with close brown dwarf or stellar companions) and low mass of the planet candidate make common-envelope evolution less likely. Other cases of white dwarfs with close brown dwarf or stellar companions are explained as the consequence of common-envelope evolution, wherein the original orbit is enveloped during the red giant phase and shrinks owing to friction. The planet candidate is roughly the same size as Jupiter and is no more than 14В times as massive (with 95 per cent confidence). We observed and modelled the periodic dimming of the white dwarf caused by the planet candidate passing in front of the star in its orbit. Here we report the observation of a giant planet candidate transiting the white dwarf WDВ 1856+534 (TICВ 267574918) every 1.4В days. So far, no intact planets have been detected in close orbits around white dwarfs. Recently, the discovery of a gaseous debris disk with a composition similar to that of ice giant planets 14 demonstrated that massive planets might also find their way into tight orbits around white dwarfs, but it is unclear whether these planets can survive the journey. Some white dwarfs show evidence for rocky material floating in their atmospheres 5, in warm debris disks 6, 7, 8, 9 or orbiting very closely 10, 11, 12, which has been interpreted as the debris of rocky planets that were scattered inwards and tidally disrupted 13. During the red giant phase, any close-orbiting planets will be engulfed by the star 2, but more distant planets can survive this phase and remain in orbit around the white dwarf 3, 4. Nature volumeВ 585, pages 363вЂ“367 ( 2020) Cite this articleДЄstronomers have discovered thousands of planets outside the Solar System 1, most of which orbit stars that will eventually evolve into red giants and then into white dwarfs. A giant planet candidate transiting a white dwarf

White dwarf magazine november 2013