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The unusual gamma-ray burst GRB 101225A explained as a minor body falling onto a neutron star

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Abstract

The tidal disruption of a solar-mass star around a supermassive black hole has been extensively studied analytically1,2 and numerically3. In these events, the star develops into an elongated banana-shaped structure. After completing an eccentric orbit, the bound debris falls into the black hole, forming an accretion disk and emitting radiation4,5,6. The same process may occur on planetary scales if a minor body passes too close to its star. In the Solar System, comets fall directly into our Sun7 or onto planets8. If the star is a compact object, the minor body can become tidally disrupted. Indeed, one of the first mechanisms invoked to produce strong gamma-ray emission involved accretion of comets onto neutron stars in our Galaxy9. Here we report that the peculiarities of the ‘Christmas’ gamma-ray burst (GRB 101225A10) can be explained by a tidal disruption event of a minor body around an isolated Galactic neutron star. This would indicate either that minor bodies can be captured by compact stellar remnants more frequently than occurs in the Solar System or that minor-body formation is relatively easy around millisecond radio pulsars. A peculiar supernova associated with a gamma-ray burst provides an alternative explanation11.

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Figure 1: Light curves of GRB 101225A.

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Acknowledgements

The authors acknowledge support from ASI and INAF. S. Campana wants to thank A. Possenti and N. Tanvir for conversations, and acknowledges N. Schartel for granting a DDT XMM-Newton observation.

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Contributions

S. Campana led the research and wrote the majority of manuscript, invented the tidal disruption model, and did the X-ray data analysis. G.L. and E.M.R. worked on the tidal disruption model, fitted the light curves providing the minor-body parameters, and estimated the rate of events. P.D.’A. analysed optical data. N.P., M.D.V., G.T. and S. Covino contributed to the exclusion of Galactic models. G. Ghisellini, G. Ghirlanda, N.P., E. Pian and M.D.V. contributed to the exclusion of extragalactic models. R.S. contributed to exclude the possibility of tidal disruption onto an intermediate-mass black hole. L.A.A., A.M., G.C., V.D.’E., D.F., E. Palazzi, B.S. and S.D.V. contributed in obtaining optical data and provided an unbiased reading of the manuscript.

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Correspondence to S. Campana.

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The authors declare no competing financial interests.

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This file contains Supplementary Text and Data, Supplementary Tables 1-5, Supplementary Figures 1-3 with legends and additional references. (PDF 308 kb)

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Campana, S., Lodato, G., D’Avanzo, P. et al. The unusual gamma-ray burst GRB 101225A explained as a minor body falling onto a neutron star. Nature 480, 69–71 (2011). https://doi.org/10.1038/nature10592

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