Substellar companions around neutron stars

Astronomy and Astrophysics – Astronomy

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Scientific paper

Planets or substellar companions around neutron stars can give valuable insights into a neutron star's formation history considering for example birth kicks or fallback disks. They may also help to derive neutron star masses which would be very welcome especially if the radius can be derived by other means as for the radio-quiet X-ray thermal neutron stars. Currently there are two planetary systems around millisecond pulsars known. They have been found by the pulse timing technique which is most sensitive to old millisecond pulsars. Some of the formation theories can already be ruled out for these systems. However, statistics are very poor and other search techniques are needed to cover also young, even radio-quiet neutron stars. We will present first results of our direct imaging search for substellar companions around the closest and youngest neutron stars started three years ago with ESO's VLT. Among the objects is the famous RX J1856.5-3754 for which a substellar object could help to constrain the equation of state as the radius has been already previously derived by its X-ray thermal emission.

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