Nova V2487 Oph, spectral distribution
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Astronomers detected gamma radiation coming from the binary system RS Ophiuchi for a month after the thermonuclear explosion. This star system contains a small white dwarf and a red giant. According to a new study the radiation was emitted from winds of the secondary red giant star accelerated by the nova explosion.
Astronomers led by Byeong-Cheol Lee have made a groundbreaking discovery, detecting a brown dwarf orbiting the red giant HD 18438. With a radius of 89 times that of the Sun, HD 18438 is now the largest known star to be orbited by an exoplanet or brown dwarf.