About 20 years ago, when exoplanets were a hot topic, we decided to search for Jovian planets around hot white dwarfs (WDs) using high-dispersion spectra, expecting that the surface of a Jovian planet orbiting close to the hot WD is ionized and emits the H-alpha line. We did not find any, but Bryan Dunne suggested and we agreed to call a Jupiter around a hot WD "Chupiter". I was intrigued by 1 keV X-ray photons detected at apparently single WDs. No companions could be found to explain this X-ray emission that is too hard for WD's photospheric emission. Finally, XMM observations of KPD0005+5106 revealed a modulated hard X-ray light curve. This can be explained only by a sub-stellar companion. This companion could be a brown dwarf or a giant plant like Jupiter. Maybe we have found a Chupiter!
Topic: Astronomy Colloquium SP22
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