Is there a fallback disk around RX J0720.4-3125?

Details Is there a fallback disk around RX J0720.4-3125? Is there a fallback disk around RX J0720.4-3125?

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70045p&link_type=abstract

Spitzer Proposal ID #70045

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Scientific paper

The nearby neutron star RX J0720.4-3125 is the 2nd-brightest of the so-called 'Magnificient Seven' and a promising candidate to search for a circumstellar, dusty disk due to its unique observational properties: It exhibits long-term X-ray spectral variability and accretion of debris produced by an asteroid collision is discussed as cause of these spectral changes. Recently, Hambaryan et al. 2009 found an X-ray absorption feature which they suggested originates from Oxygen in a slab close to the neutron star. The Magnificient Seven have very distinctive properties compared to other neutron stars - their X-ray spectrum is purely thermal and they are not detected at radio wavelengths. These objects are slow rotators with strong magnetic fields. Due to their properties these objects are discussed as link to other neutron star populations, and the possession of a circumstellar disk, created from supernova fallback material, is one key parameter in understanding the different populations. We propose to observe the particular promising RX J0720.4-3125 with IRAC to test for the presence of a disk around this enigmatic object.

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