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SN 1987A: Observations at Later Phases

Published online by Cambridge University Press:  12 April 2016

P. Bouchet ,
I. J. Danziger ,
C. Gouiffes ,
M. Della Valle  and
A. Moneti
P. Bouchet
Affiliation:
European Southern Observatory, La Silla (Chile)
I. J. Danziger
Affiliation:
European Southern Observatory, Garching (Germany)
C. Gouiffes
Affiliation:
3DAPNIA/Sap, C. E. Saclay (France)
M. Della Valle
Affiliation:
European Southern Observatory, La Silla (Chile)
A. Moneti
Affiliation:
European Southern Observatory, La Silla (Chile)

Extract

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The last observations (until April 1993) of SN 1987A made at ESO, La Silla, are presented. Our data show that: (i) the criterion of line shifts proves that dust is still present and is absorbing more strongly than ever; (ii) the I magnitude decreases faster than the other ones after day ∼1700; (iii) the 1.3mm flux is constant at about 9mJy, and comes most probably from free-free emission produced by the cooling of the former star envelope still weakly ionized. Previous analyses of the bolometric light curve until day 1444 are briefly reviewed. In spite of the large uncertainties, the flattening of the light curve, observed after day ∼900, extends until our latest data points (day 2172). This can be explained by theoretical models including time-dependent effects due to long recombination and cooling times (Fransson and Kozma 1993). However, one cannot rule out the presence of a compact object such as a neutron star, radiating as a pulsar or accreting matter from a disk either continuously or intermittently.

Type
SN 1987A, SN 1993J, and Other Supernovae
Information
International Astronomical Union Colloquium , Volume 145: Supernovae and Supernova Remnants , 1996 , pp. 201 - 210
Copyright
Copyright © Cambridge University Press 1996

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