This webinar will cover implementation of time series observations using NIRCam's Dispersed Hartmann Sensor (DHS) grisms in the short-wavelength channel, which are being introduced for JWST Cycle 4. The DHS enables 0.6 to 2.3 µm low resolution spectroscopy simultaneously with the long-wavelength grism (2.4 to 5.0 µm) for NIRCam Grism Time Series Observations. The capability improves the bright limit for such observations, and relies on rather novel new subarray operations. Technical aspects of proposal planning will be highlighted, and a few scientific use cases of relatively bright transiting exoplanets will be presented.

Materials and Videos

Link to presentation: Introduction to NIRCam Grism TSOs

The example APT file is available to retrieve within APT: File>Retrieve from STScI>Retrieve using Program ID 38.

The example ETC workbook is publicly accessible as a Sample Workbook titled "NIRCam Short Wavelength Grism Time-Series (Enabled by DHS)", workbook number 214650. 

Links to videos:

1. Introduction and Background
2. Mitigating NIRCam SW Grism Data Excess and Saturation
3. Setting up NIRCam SW Spectroscopy
4. Defining NIRCam SW Grism Observations Using APT