0Assigned ID: 1349
----- Attempting Submission 1 (Fri Jan 29 23:52:53 GMT 2021) -----
HST Phase I Proposal 1349 successfully submitted.
Receipt: # 1349-1This pattern is not used in this proposal.Attached is our Phase II submission for HST observations of nearby supernova 2019ehk in M100. I have updated the NSAMP for the IR orbit so that there is now no overrun.
Please direct all inquiries to me, Wynn Jacobson-Galan, if any additional information is needed.
Thank you!
Best,
Wynn Jacobson-Galan-1533157597----- Attempting Submission 1 (Sat Mar 27 17:54:09 GMT 2021) -----
----- Attempting Submission 2 (Thu Apr 15 17:10:33 GMT 2021) -----
HST Phase II Proposal 16500 successfully submitted.
Receipt: # 16500-2
----- Attempting Submission 3 (Wed Apr 21 14:30:52 GMT 2021) -----Unused pattern.Probing the Post-genitor System of Calcium-rich Transient SN 2019ehkSupernova (SN) 2019ehk in M100 is the closest known Calcium-rich (Ca-rich) transient and the only object in this class with an X-ray detection. Prompt, high-cadence follow-up of this transient across the EM spectrum, in addition to pre-explosion HST imaging, has indicated that the progenitor star was likely low mass (e.g., white dwarf or <10Msun) and surrounded by dense circumstellar material (CSM) whose geometry/density was capable of producing luminous X-ray emission as well as a double-peaked optical light curve. The close proximity of SN 2019ehk provided the first opportunity to obtain multi-color HST observations out to 400 days post explosion, which revealed a pure radioactive decay power source. Ca-rich transients typically decrease in magnitude rapidly and therefore, prior to SN 2019ehk, their late-time decline rate and power source at t<400 days was unknown. Here we propose multi-color imaging of SN 2019ehk in order to search for emission from a bound remnant white dwarf as predicted by a favored progenitor model for this explosion. Detection and characterization of such a remnant will provide a novel constraint on the progenitors of Ca-rich transients and provide a new window into the explosion itself. Additionally, these observations will provide the best constraints to date on a potential non-degenerate companion star in any thermonuclear SN progenitor system such as Ca-rich SNe.We propose to observe nearby supernova 2019ehk with WFC3/UVIS in filters F555W and F814W in the first of our two allocated orbits. In the second orbit, we will observe SN 2019ehk with WFC3/IR in filter F160W. Our optimal observing window is between 19-April-2021 and 16-May-2021, however, 22-May-2021 to 12-July-2021 is another acceptable scheduling window. We have requested that IR imaging be taken within 3 days of the UVIS imaging orbit. Below is our observing plan for each filter in each orbit:
Orbit 1:
F555W: Total Exposure time = 1500s; Split into two 750s exposures using WFC3-UVIS-DITHER-LINE pattern
F814W: Total Exposure time = 900s; Split into two 450s exposures using WFC3-UVIS-DITHER-LINE pattern
Orbit 2:
F160W: Eight ~300s individual exposures for each filter using the WFC3-IR-DILTER-BOX-MIN pattern.Mr. Wynn Jacobson-Galan has extensive experience analyzing and reducing WFC3/UVIS data, the instrument proposed for this program. Mr. Jacobson-Galan is a graduate student with burgeoning expertise on the late-time light curves of thermonuclear supernovae observed with HST (3 refereed papers) and calcium-rich transients (3 refereed papers). Mr. Jacobson-Galan has completed analysis on both the early- and late-time, multi-wavelength observations of the proposed target, SN 2019ehk, and all data on this object, including late-time HST imaging, are available in two refereed publications in the Astrophysical Journal. Prof. Raffaella Margutti is a leading expert on x-ray and radio observations of exotic transients such as SN 2019ehk. Prof. Dan Milisavljevic has 1 refereed paper on calcium-rich transients and has compreheisve experience with HST observations. Dr. Peter Blanchard has published 5 papers using HST data, including both archival and new observations led by Dr. Blanchard. Dr. Charles Kilpatrick has significant expeaience in reduction and analysis of HST/WFC3, ACS, and WFPC2 imaging data, including the prime instruments used in these proposed observations. Prof. Ryan Foley is an expert in transient surveys and follow up of all types of explosive transients. Mr. Sebastian Gomez and Dr. Griffin Hosseinzadeh have assisted with the ground-based observations of the proposed target and analysis of late-time observations.Stellar Physics and Stellar Types6falsefalsefalsefalsefalsefalsefalsefalseSUPPORTEDSTARSUPERNOVANOThis object was generated by the targetselector and retrieved from the SIMBAD database.J2000J2000g ~ 28, r ~ 26.5, i/z ~ 24.2WFC3/UVISImagingNoNoF555WWFC3/UVISImagingNoNoF814WWFC3/IRImagingNoNoF160WPOS-TARGDITHER0.145LINEfalsefalse246.84WFC3-UVIS-DITHER-LINE1falsePOS-TARGDITHER0.572LINE0.365falsefalse74.653418.528WFC3-IR-DITHER-BOX-MIN2falseTiming link suitability includes constraints ([02 After 01 by 1.0 to 3.0 days])The scheduling data was generated by CASM 29.0.CASM was run in Phase II mode.Orbit 1:
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