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tokens: ACKNOWLEDGEMENTS We are hugely grateful to those who contributed to the LiJET project. We would like to thank all the staff of the 2.4-m telescope of Lijiang station of Yunnan Observatories for their help and support during our observations. Funding for the telescope has been provided by the Chinese Academy of Sciences (CAS) and the People’s Government of Yunnan Province. We acknowledge the support from the Project Based Personnel Exchange Program (PPP) with China Scholarship Council (CSC) and German Academic Exchange Service (DAAD) ([2016] 6041). We also thank the anonymous referee for helpful comments and suggestions, which led to significantly improvement in our manuscript. This work was financially supported by the National Natural Science Foundation of China (NSFC) under grant Nos. 10373023, 10773027 and 11333006, and the CAS through project No. KJCX2-YW-T24, and the CAS ‘Light of West China’ Program.