DDT Highlight: SN 2014J Imaging and Spectroscopy with FORCAST, FLITECAM, and HIPO

SOFIA near-IR image of Supernova 2014J

Two images of the central portions of galaxy M82 that include the position of Supernova 2014J (north is at the top, east is to the left in these images). (left) Near-infrared image from the 2-Micron All-Sky Survey (2MASS), before the supernova explosion. (right) Image of M82 including the supernova at near-infrared wavelengths J, H, and K (1.2, 1.65, and 2.2 microns), made Feb. 20 by the FLITECAM instrument on SOFIA.

SN 2014J Spectrum

FLITECAM observed the H + K-band spectrum on Feb. 19, 2014 and Feb. 27, 2014 with strong emission features at 1.55-1.65 μm and 1.77 μm. The detail of the geometry of the 1.77 μm emission peak has enabled it to be identified as permitted lines of Co ΙΙ rather than a blend of Fe group lines and Co ΙΙ as previously believed. The strongest emission lines of Co ΙΙ and [Co ΙΙΙ] are presented in the bottom of each plot, and triangles indicate the locations of lines predicted to be strong in the model for comparison. 

Favorable atmospheric transmission achievable in the stratosphere onboard SOFIA has enabled FLITECAM spectra to be the only data collected on SN 2014J that spans the entire feature profile. 

Vacca, W. D. et al., 2015, ApJ, 804, 66.
PID Instrument Config. Time Observation Dates Range
02_0100 FLITECAM Spectroscopy - J, H, K-bands 2 hrs Feb 17-28
75_0001 FLITECAM Spectroscopy - LM+B, LM+C 4 hrs Feb 17-28
75_0002 FORCAST Imaging - 7.7, 8.6, 11.1, 19.7, 37.1 µm 1.5 hrs Mar 19-28; Apr 30-May 8h
75_0003 FORCAST Spectroscopy - G063, G111 4 hrs Mar 19-28; Apr 30-May 8

Observations of SN 2014J were obtained using FLITECAM on flights 146, 147, 148 and 149 and using FORCAST on flight 154. They were obtained as part of the following programs -

02_0100, PI: P. Garnavich, FLITECAM grism spectroscopy.
75_0001, PI: R. Hamilton, FLITECAM grism spectroscopy.
75_0002, PI: R. Gehrz, FLITECAM and FORCAST imaging.
75_0003, PI: W. Vacca, FORCAST grism spectroscopy.

The data obtained as part of these programs have no proprietary period, and available to the public upon ingestion into the archive.

No Program ID ; PI: J. Spyromilio (ESO)
DDT proposal to observe Supernova 2014J (J09554214+6940260) in M82 with SOFIA

Program ID: 02_01001 ; P. Garnavich (University of Notre Dame)
Mind the Gap: Filling in the Holes in IR Spectra of Type Ia Supernovae

1. The data from this program were obtained as part of the Cycle 2 time allocation.

The data files in the archive at this time include raw science instrument frames listed as LEVEL_0 or LEVEL_1 (for this release the two may be considered identical) for all the FLITECAM and FORCAST data obtained on SN 2014J. Data processing is ongoing at the Science Center. Once the artefact-corrrected images are ready, they will appear in the archive as LEVEL_2 data. After calibration, the final results will appear as LEVEL_3 data. Because most of these data were taken as part of the commissioning flights for FLITECAM, firm dates for the release of Level 2 and Level 3 data cannot be given at this time. However, we expect these and the FORCAST Level 2 and 3 data to become available in May, 2014.

The data may be obtained via the SOFIA Science Archive search page by querying on the Instrument name (FLITECAM or FORCAST) from the pull-down menu and using "2014J" (no quotation marks) in the "Target:" field without resolving the target with SIMBAD or NED. The search may be refined by including the Spectral Element from the pull-down menu (default = "ALL"). The result should be organized by "Data File" (default). The files in the archive are in FITS format and can be read with standard viewers. Please be aware that co-ordinates in the headers will not be accurate, but the supernova should be recognized in the images.

Note also that HIPO data were obtained along with the FLITECAM data, since both instruments were observing simultaneously. Because HIPO is a Special Purpose Principal Investigator Instrument, calibrated data will not be available on the SOFIA archive, but the Level 1 data may be obtained via the search page by querying on "HIPO" under the Instrument Name pull-down menu.

The following list of URLs link directly to the DCS archive pages, one for each AOR ID, from where the data can be downloaded. Note that the Level 2 and Level 3 will eventually become available via these links.









FORCAST Grism Spectra




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