Hidden compact objects revealed by wide-field optical surveys

Abstract:

Compact objects (white dwarfs, neutron stars, or black holes) are stellar 'fossils' bearing critical information about the Galactic stellar evolutionary history. In binary systems, hidden compact objects can be revealed by monitoring the 'wobbling' effect of the visible companion star. We utilise efficient wide-field spectroscopic surveys like LAMOST (a.k.a. the GuoShouJing telescope) and high-precision photometric surveys like TESS to hunt for binary systems containing a compact object and a luminous companion star. I present our methodology and recent discoveries, introducing three interesting systems characterised by phase-resolved observations, and posting questions about explorations and exploitations of current and future time-domain surveys.



Speaker: 
Yi Tuan (伊团, Department of Astronomy, Xiamen University)
Place: 
Zoom Meeting ID: 822 8287 7472 , Passcode: astroPKU , Link: https://us02web.zoom.us/j/82282877472?pwd=VXFOYmtaRUhZMVplYWp1OFQ4OGsvQT09
Time: 
Tuesday, December 13, 2022 - 1:30PM to Tuesday, December 13, 2022 - 2:10PM
Link: 
https://us02web.zoom.us/j/82282877472?pwd=VXFOYmtaRUhZMVplYWp1OFQ4OGsvQT09
Biography: 
Yi Tuan is currently a post-doctoral research fellow at the Department of Astronomy, Xiamen University, People’s Republic of China. He got his PhD also in Xiamen University under the supervision of Professor Gu Wei-Min. His research interests are: (1) optical time-series spectroscopic and photometric observations on stellar systems. (2) multi-wavelength observations and analyses of binary systems containing compact objects (white dwarfs, neutron stars, or black holes).