The Very Young Type Ia Supernova 2012cg: Discovery and Early-time Follow-up Observations

@article{Silverman2012TheVY,
  title={The Very Young Type Ia Supernova 2012cg: Discovery and Early-time Follow-up Observations},
  author={J. Silverman and M. Ganeshalingam and S. Cenko and A. Filippenko and Weidong Li and A. Barth and D. Carson and M. Childress and K. Clubb and A. Cucchiara and M. Graham and G. Marion and M. Nguyen and L. Pei and B. Tucker and J. Vink{\'o} and J. Wheeler and G. Worseck},
  journal={The Astrophysical Journal},
  year={2012},
  volume={756}
}
On 2012 May 17.2 UT, only 1.5 ± 0.2 days after explosion, we discovered SN 2012cg, a Type Ia supernova (SN Ia) in NGC 4424 (d 15 Mpc). As a result of the newly modified strategy employed by the Lick Observatory Supernova Search, a sequence of filtered images was obtained starting 161 s after discovery. Utilizing recent models describing the interaction of supernova (SN) ejecta with a companion star, we rule out a ~1 M ☉ companion for half of all viewing angles and a red-giant companion for… Expand

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