Please find attached our revised proposal for observations of faint host galaxies to luminous supernovae.1551598033Assigned ID: 1604
----- Attempting Submission 2 (Fri Mar 01 18:12:16 GMT 2013) -----
HST Phase I Proposal 1604 (lsn_c21.apt) successfully submitted.
----- Attempting Submission 3 (Fri Mar 01 23:15:55 GMT 2013) -----Please find attached our submission of 13480 targetting luminous SNe without known host galaxies. Please let us know if
anything needs changing or checking.
Best Wishes,
Andrew578002876----- Attempting Submission 1 (Wed Jun 26 17:02:24 GMT 2013) -----Super-luminous supernovae without host galaxiesSuper-luminous supernovae (SLSNe) are a population of presumed core collapse events, whose peak luminosity is a factor up to a hundred greater than that of the majority of SNe (typically M_V < -22). Several models have been proposed for their progenitors, including an origin in the collapse of massive low metallicity stars in so called pair instability SNe, potentially making SLSNe a powerful link to the early Universe. In Cycle 20 we are undertaking a survey of SLSNe hosts in the UV and IR. Remarkably, even at the deep limits of HST, 1/3 of these SLSNe have no detected host galaxy (F336W > 26.5, corresponding to absolute magnitude limits of M_UV ~ -13 at z~0.2), and another 1/3 lie on regions within their host where there is no sign of ongoing star formation. This may suggest either that these events arise in extremely low luminosity (and possibly low metallicity) star forming galaxies, or alternatively that we need to reasses their interpretation as core collapse events. Here we propose to resolve this discrepancy, by obtaining deep observations of 3 events without host galaxies in both the optical and IR. We will place limits that are a factor of ~6-8 deeper than those currently obtained, covering even the lowest luminosity star forming dwarf galaxies known, reaching limiting absolute magnitudes of M_V ~ -11. If we locate hosts in these images it would imply an origin in low metallicty star forming systems. Alternatively, their non-detection may suggest that they do not lie on host galaxies, and instead may be an older population, not formed through a conventional core-collapse mechanism, that has moved significantly from their birth sites before the supernova.The purpose of these observations is to perform a deep optical and IR search for emission at the location of a sample of superluminous SNe whose host galaxies appear to be extremely underluminous.
We will obtain these observations by taking two orbits of ACS/F606W data, utilizing a 4-point dither and placing the target at the WFC1-CTE aperture to mitigate against any CTE losses. We will complement these data by observing a single orbit with WFC3/IR, again using a 4-point dither.HOT STARSDefaultfalsefalsefalsefalsefalseSUPPORTEDGALAXYHIGH REDSHIFT GALAXYJ2000J2000GALAXYHIGH REDSHIFT GALAXYJ2000J2000GALAXYHIGH REDSHIFT GALAXYJ2000J2000ACS/WFCImagingNoNoF606WACS/WFCImagingNoNoF606WACS/WFCImagingNoNoF606WWFC3/IRImagingNoNoF140WWFC3/IRImagingNoNoF140WWFC3/IRImagingNoNoF140WPOS-TARGDITHER0.265LINE0.187falsefalse69.05420.67ACS-WFC-DITHER-BOX1falsePOS-TARGDITHER0.572LINE0.365falsefalse74.653418.528WFC3-IR-DITHER-BOX-MIN2false/Users/levan/OP-cache/13480_slsn-vS1.xmlThe scheduling data was generated by CASM 21.2.CASM was run in Phase II mode.(Tic-Visit
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