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New X-ray observations of the hot subdwarf binary HD49798 / RXJ0648.0-4418
S. Mereghetti, F. Pintore, T. Rauch +7
HD49798 / RXJ0648.0-4418 is the only confirmed X-ray binary in which the mass donor is a hot subdwarf star of O spectral type and, most likely, it contains a massive white dwarf (1…
EXTraS discovery of an X-ray superflare from an L dwarf
A. De Luca, B. Stelzer, A. J. Burgasser +13
We present the first detection of an X-ray flare from an ultracool dwarf of spectral class L. The event was identified in the EXTraS database of XMM-Newton variable sources, and it…
Results from DROXO IV. EXTraS discovery of an X-ray flare from the Class I protostar candidate ISO-Oph 85
Daniele Pizzocaro, Beate Stelzer, Roberta Paladini +15
X-ray emission from Young Stellar Objects (YSOs) is crucial to understand star formation. A very limited amount of X-ray results is available for the protostellar (ClassI) phase. A…
Follow-up observations of X-ray emitting hot subdwarf star: the He-rich sdO BD +37° 1977
N. La Palombara, P. Esposito, S. Mereghetti +2
We report on the results of the first XMM-Newton satellite observation of the luminous and helium-rich O-type subdwarf BD +37° 1977 carried out in April 2014. X-ray emission is det…
Search for X-ray emission from subdwarf B stars with compact companion candidates
Sandro Mereghetti, Sergio Campana, Paolo Esposito +2
Stellar evolutionary models predict that most of the early type subdwarf stars in close binary systems have white dwarf companions. More massive companions, such as neutron stars o…
The progenitor of a type Ia supernova with a short delay time?
S. Mereghetti, N. La Palombara, A. Tiengo +3
HD49798/RXJ0648.0-4418 is the only known X-ray binary composed of a hot subdwarf and a massive white dwarf (M=1.28+/-0.05 Msun). This system, with an orbital period of 1.55 days, i…
An XMM-Newton view of Planetary Nebulae in the Small Magellanic Cloud. The X-ray luminous central star of SMP SMC 22
S. Mereghetti, N. Krachmalnicoff, N. La Palombara +5
During an X-ray survey of the Small Magellanic Cloud, carried out with the XMM-Newton satellite, we detected significant soft X-ray emission from the central star of the high-excit…