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Institut für Astronomie und Astrophysik

Abteilung Astronomie

Sand 1, D-72076 Tübingen, Germany
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Preprint 05/07

Limits on iron-dominated fallback disk in SN 1987A

K. Werner (1), T. Nagel (1), T. Rauch (1)

(1) Institut für Astronomie und Astrophysik, Sand 1, 72076 Tübingen, Germany

To be published in: Proceedings "Supernova 1987A: Twenty years after"

Abstract. The non-detection of a point source in SN1987A imposes an upper limit for the optical luminosity of L=2Lsun. This limits the size of a possible fallback disk around the stellar remnant. Assuming a steady-state thin disk with blackbody emission requires a disk smaller than 100,000 km if the accretion rate is at 30% of the Eddington rate (Graves et al. 2005). We have performed detailed non-LTE radiation transfer calculations to model the disk spectrum more realistically. It turns out that the observational limit on the disk extension becomes even tighter, namely 70,000 km.

Preprint (560 kb PDF file including figures)
Astrophysics (astro-ph): astro-ph/0703520

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