# Optical Spectra and Light Curves of Supernovae

**Authors:** Alexei V. Filippenko  
**arXiv:** [astro-ph/0307138](https://arxiv.org/abs/astro-ph/0307138)  
**Date:** 2003-07-08  
**Summary page:** https://www.summarizepaper.com/en/paper/astro-ph--0307138v1/

## Key points

- Alexei V. Filippenko's research group conducts optical observations of supernovae (SNe) using the Lick Observatory Supernova Search.
- The 0.76-m Katzman Automatic Imaging Telescope is recognized as the most successful search for nearby SNe worldwide.
- SN 2000cx is a peculiar supernova with distinct features not seen in other SNe Ia.
- SN 2002cx exhibits properties opposite to those of SN 2000cx.
- Detailed data analysis on SNe II-P 1999em and 1999gi has helped derive distances using the expanding photosphere method.
- Spectropolarimetry findings suggest increased asphericity in core-collapse SNe ejecta.
- Filippenko's team uses Hubble Space Telescope data to identify potential progenitors of core-collapse SNe or establish origin constraints, enhancing understanding of supernovae phenomena.

## Summary

Alexei V. Filippenko presents a comprehensive review of recent optical observations of supernovae (SNe) conducted by his research group. The Lick Observatory Supernova Search, utilizing the 0.76-m Katzman Automatic Imaging Telescope, is recognized as the most successful search for nearby SNe worldwide. This telescope captures multicolor light curves of SNe and provides valuable insights into their behavior and characteristics. Among the notable discoveries discussed in the review is SN 2000cx, a peculiar supernova that displays distinct features not observed in previously studied SNe Ia. Additionally, Filippenko's team delves into the intriguing case of SN 2002cx, which exhibits properties that are diametrically opposite to those of SN 2000cx. Detailed data analysis on SNe II-P 1999em and 1999gi has enabled the researchers to derive distances using the expanding photosphere method, shedding light on the spatial distribution of these supernovae. Furthermore, findings from spectropolarimetry indicate a trend towards increased asphericity as researchers probe deeper into the ejecta of core-collapse SNe. Leveraging Hubble Space Telescope data, Filippenko's team aims to identify potential progenitors of core-collapse SNe or establish constraints on their origins. This ongoing research not only enhances our understanding of supernovae phenomena but also contributes valuable insights towards unraveling the mysteries surrounding these cosmic events.