Kepler_SNR
We propose to observe Kepler's supernova remnant (SNR), which is a rare Type-Ia SNR associated with N-rich circumstellar medium (CSM). Our minimal goals are (1) to measure elemental abundances of the CSM and (2) to study electron-ion temperature nonequilibration. The CSM abundance will constrain the mass of the donor star in the progenitor system. If we are awarded 200 ks, then we will perform spatially-resolved spectroscopy, and we will reveal the CSM distribution. We will also clearly detect outermost ejecta materials, i.e., O and C (if present), from the southern rim, where the CSM contribution is much weaker than in the north. The amount of the outermost ejecta will allow us to infer explosion physics which also helps reveal the subclass of Kepler's SN.
obsid = 300005020 / Unique Observation/Sequence Number
object = Kepler_SNR / Object name
pi_name = Collaboration XRISM / Proposal Principal Investigator Name
ra = 262.664824701916 / Right Ascension (Pointing Position) (deg)
dec = -21.4822594989281 / Declination (Pointing Position) (deg)
roll_angle = 269.997193030638 / Roll Angle (deg)
start_time = 2024-08-21T06:27:04 / Start Time of the Observation
stop_time = 2024-08-23T12:06:04 / Stop Time of the Observation
exposure = 91626.90625043 / Effective Total Observation Exposure (s)
public_date= 2025-08-31 / Public Date