Current sky surveys are discovering a harvest of novel types of
stellar transients that cannot be explained with traditional explosion
channels. Their number expected to dramatically increase in the
Synoptic Survey Telescope (LSST) era. The LSST will discover objects
soon after the outburst onset and will provide well-sampled multi-band
light curves through both the main and ancillary surveys. Thanks to
the multiple survey strategies, we will discover and monitor
transients in different time domains, and we will study transients
evolving with different time scales.
One of the research fields that will largely take advantage from LSST is that of the so-called Intermediate-Luminosity Optical Transients (ILOTs; e.g. Kasliwal 2007, Berger et al. 2009, ApJ, 699, 1850; see also Noam Soker’s pages). These transients, with absolute magnitudes intermediate between those of core-collapse supernovae (SNe) and classical novae (-10 > MV > -15), are challenging our observational and theoretical knowledge of stellar evolution.
The main goal of this project is the characterization of the different
types of ILOTs on the basis of their observational parameters
(long-duration photometric monitoring, spectroscopic evolution of the
outbursts, and information on the quiescent progenitors through the
analysis of high spatial resolution pre- and post-outburst images).
In this project, the following classes of ILOTs will not be
considered: low-luminosity stripped-envelopes SNe (SNe Iax, Ca-rich
transients, .Ia candidates, or other faint SNe I; e.g. Kasliwal 2013,
IAU Symposium 2013; Valenti et al. 2009, Nature, 459, 674), and
low-luminosity Type II-P events (Pastorello et al. 2004, MNRAS, 347,
74; Spiro et al. 2014, MNRAS, 439, 2873).
We will study in detail the following categories:
- Intermediate-Luminosity Red Transients (ILRTs)
- Giant outbursts and eruptions of very massive stars
- Ordinary S Dor LBV phases
- Luminous Red Novae (LRN) and other types of non-degenerate stellar mergers
- Outburst from Young Stellar Objects (YSO)
Andrea Pastorello (INAF-OAPd), Enrico Cappellaro (INAF-OAPd), Elena Mason (INAF-OATs), Yongzhi Cai (Padova University; INAF-OAPd), Leonardo Tartaglia (TTU, UC Davis), Paolo Ochner (Padova University), Nancy Elias-Rosa, Maria Teresa Botticella (INAF-OACn), Elena Barsukova (SAO, Russian Academy of Sciences), Vitaly Goranskij (SAI, Moskov University)
Morgan Fraser (University College Dublin), Giuliano Pignata (Universidad Andres Bello), Erkki Kankare (Queen’s University Belfast), Rubina Kotak (University of Turku), Subo Dong (Peking University), Kuntal Misra (ARIES), Filomena Bufano (INAF-Ct), Zach Cano (Instituto de Astrofísica de Andalucía).