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Publications of the Astronomical Society of Australia Publications of the Astronomical Society of Australia Society
Publications of the Astronomical Society of Australia
RESEARCH FRONT (Open Access)

Light Echoes of Transients and Variables in the Local Universe

A. Rest A C , B. Sinnott B and D. L. Welch B
+ Author Affiliations
- Author Affiliations

A Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA

B Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada

C Corresponding author. Email: arest@stsci.edu

Publications of the Astronomical Society of Australia 29(4) 466-481 https://doi.org/10.1071/AS11058
Submitted: 10 October 2011  Accepted: 12 March 2012   Published: 21 June 2012

Journal Compilation © Astronomical Society of Australia 2012

Abstract

Astronomical light echoes, the time-dependent light scattered by dust in the vicinity of varying objects, have been recognized for over a century. Initially, their utility was thought to be confined to mapping out the three-dimensional distribution of interstellar dust. Recently, the discovery of spectroscopically useful light echoes around centuries-old supernovae in the Milky Way and the Large Magellanic Cloud has opened up new scientific opportunities to exploit light echoes.

In this review, we describe the history of light echoes in the local Universe and cover the many new developments in both the observation of light echoes and the interpretation of the light scattered from them. Among other benefits, we highlight our new ability to classify outbursting objects spectroscopically, view them from multiple perspectives, obtain a spectroscopic time series of the outburst, and establish accurate distances to the source event. We also describe the broader range of variable objects with properties that may be better understood from light-echo observations. Finally, we discuss the prospects of new light-echo techniques not yet realized in practice.

Keywords: stars: distances — stars: supernova: individual: SN 1987A, Cas A, Tycho — stars: variables: general — novae, cataclysmic variables — dust, extinction — ISM: supernova remnants


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