ePESSTO+, the advanced Public ESO Spectroscopic Survey of Transient Objects

ePESSTO+ (advanced Public ESO Spectroscopic Survey of Transient Objects – ESO program IDs 1103.D-0328 and 106.216C) started in April 2019 at the New Technology Telescope using the instruments EFOSC2 and SOFI. It is the second extension of the PESSTO survey (PI: Smartt). It typically targets supernovae and optical transients brighter than 20 mag for classification and selected science targets for detailed follow-up. Standard EFOSC2 setups are used providing spectra with resolutions of 13-17Å between 3680-10320Å. A subset of the brighter science targets is selected for SOFI spectroscopy with the blue and red (rarely) grisms (resolutions 23Å - 33Å) and imaging with broadband JHKs filters.

ePESSTO+（高级公共ESO瞬变天体光谱巡天，英文全称advanced Public ESO Spectroscopic Survey of Transient Objects；所属ESO项目编号为1103.D-0328与106.216C）于2019年4月启动，依托新技术望远镜（New Technology Telescope）开展观测，使用的仪器包括EFOSC2与SOFI。该巡天是PESSTO巡天的第二次扩展项目（首席研究员：Smartt）。其典型观测目标为星等亮于20星等的超新星与光学瞬变天体，用于完成天体分类，同时遴选特定科学目标开展详细后续观测。观测中采用标准EFOSC2配置，可获取3680Å至10320Å波段、分辨率为13Å至17Å的光谱。部分亮度较高的科学目标会被选中，使用SOFI的蓝、红（极少使用）光栅棱镜（grisms）开展光谱观测，分辨率介于23Å至33Å之间，并通过宽带JHKs滤光片进行成像。