From Ztf to Lsst
Wing-Huen Ip1*
1Institute of Astronomy, National Central University, Jhongli, Taiwan
* presenting author:Wing-Huen Ip,
The TANGO consortium of the Institute of Astronomy, NCU, and other partner institutions is currently engaged in a large-scale international time-domain astronomical project called iPTF (intermediate Palomar Transient Factory) which is headed by the Caltech Optical Observatory. iPTF together with its predecessor, PTF, have been very successful in the search and classification of different kinds of supernovae by virtue of its large field-of-view (~ 7.2 square degrees) of the P48 (1.2 m) Schmidt telescope at Palomar and a new type of Integral Field Unit (IFU) spectrograph, SEDM (for Spectral Energy Distribution Machine). Taking advantage of the large quantity of photometric data set and the fast IFU capability, we are able to make inroad to a range of key topics in time-domain astronomy. These include: (a) multi-wavelength and Hα mapping of near-by galaxies as a component of the GW/EM counterpart identification program; (b) a comprehensive survey of Be stars in open clusters; (c) the gyrochronology of low-mass stars; (d) characterization of the physical properties and evolutionary paths of binary systems; and ultra-long period Cepheids and other variable stars in M31. Last but not least, the PTF data set has been very useful in the tracking of cometary coma activity at large solar distance beyond the water snow line. IFU mapping of cometary comas is highly promising. We have also established an excellent base in the study of asteroidal light curves with a view to search for super-fast rotators and the rotational states of different asteroidal family members. The study of binary asteroids will also be advanced by the application of the Robo-AO instrument on the 2.1 m telescope at Kitt Peak within the framework of the collaborative program. Looking to the near future, the Zwicky Transient Facility (ZTF) with an unprecedented 47 square-degree field of view will be the most powerful wide field survey telescope before the arrival of LSST. Even in the LSST era, ZTF will continue to play a major role in the time-series observations in the northern hemisphere. Taiwanese astronomers are therefore in a very good position to explore the transient Universe with both frontier telescopes.

Keywords: Time-domain astronomy, Astrophysical transients, Solar system objects