Helium Detection in IRTF Spectra of SN 2011dh

Details Helium Detection in IRTF Spectra of SN 2011dh Helium Detection in IRTF Spectra of SN 2011dh

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011atel.3435....1m&link_type=abstract

The Astronomer's Telegram, #3435

Astronomy and Astrophysics

Astronomy

7

Infra-Red, Supernovae

Scientific paper

We observed SN 2011dh with the IRTF 3.5m and the SpeX instrument on June 8, 12, & 16. No helium was detected on June 8. Weak evidence for helium was present on June 12 and He I is unambiguously detected from the 1.0830 & 2.0581 micron lines in the spectrum obtained June 16. The He I velocities on June 16 are about 8000 km/s while H velocities remain above 11000 km/s. O I & Fe II are also clearly detected.

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