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In the last few years the Fermi -LAT instrument has detected GeV gamma-rayemission from a few novae. Such GeV emission can be interpreted in terms of aninverse Compton process of electrons accelerated in a shock. It is expectedthat hadrons can be accelerated in the same conditions, but reaching muchhigher energies. They can produce a second component in the gamma-ray spectrumat TeV energies. We performed follow-up observations of selected novae anddwarf novae in a search of the second component in the gamma-ray spectrum. Thiscan shed light on the acceleration process of leptons and hadrons in novaexplosions. We have performed observations with the MAGIC telescopes of 3sources, a symbiotic nova YY Her, a dwarf nova ASASSN-13ax and a classical novaV339 Del shortly after their outbursts.

Very high energy gamma-ray follow-up observations of novae and dwarf novae with the MAGIC telescopes