The Sub-Luminous Type Ia Supernova 1999by

Details The Sub-Luminous Type Ia Supernova 1999by The Sub-Luminous Type Ia Supernova 1999by

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.3806b&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #38.06; Bulletin of the American Astronomical Society, Vol. 31, p.1424

Astronomy and Astrophysics

Astronomy

4

Scientific paper

We analyze photometric and spectroscopic observations of the supernova SN 1999by in the spiral galaxy NGC 2841. CCD images were taken with the 1.2 m telescope and spectra with the 1.5 m Tillinghast telescope at the Fred Lawrence Whipple Observatory in Arizona. SN 1999by reached maximum in B on UT 1999 May 10 (JD 24501308.5 +/- 1) with B=13.80 +/- 0.02 and V=13.36 +/- 0.02, as indicated by 20 photometric observations between May 6 and June 21. The light-curves obtained in the U, B, V, R and I filters were compared to the templates of the subluminous type Ia SN 1991bg. SN 1999by appears very similar to SN 1991bg; it has Δ m15(B)=1.87, versus 1.93 for SN 1991bg, making SN 1999by one of the most sub-luminous type Ia supernovae ever observed. The ratio of the spectral lines at 580 and 615 nm is small, consistent with being under-luminous. Models indicate that the spectrum contains deep titanium absorption bands, especially in the blue.

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