Fermi J1820-1648: SMA Detection of Bright Millimeter Emission
ATel #17704; Anna Ho (Cornell), Mark Gurwell, Garrett K. Keating (CfA), Kishalay De (Columbia/CCA), Laura Chomiuk (MSU)
on 27 Feb 2026; 22:05 UT
Credential Certification: Anna Ho (ayh24@cornell.edu)
Subjects: Millimeter, Nova
Referred to by ATel #: 17707
We observed the classical nova Fermi J1820-1648 (ATel #17688, #17698, #17699, #17700) with the Submillimeter Array (SMA) on 27 February 2026 UT. The SMA realtime quicklook pipeline POLARIS showed the source was detected with high SNR even as the observations were continuing. After observations, data were processed and imaged with the COMPASS calibration pipeline, and a clear point source was detected at the position of the nova, with a flux density of 12.66 +/- 0.73 mJy (SNR 17) at 230 GHz. Gains were calibrated using NRAO530, passband was calibrated using 3C279, flux was calibrated using MWC349A, the total integration time on the target was 2.43 hours, and the SMA was operating with 7 antennas.
Further observations are planned. We thank the SMA staff for scheduling and conducting the observation.
