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Mid-IR progenitor of SN 2010da in NGC 300

ATEL # 2632; R. Khan, K. Z. Stanek, C. S. Kochanek, T. A. Thompson (Ohio State University), J. L. Prieto (Carnegie Observatories)
on 24 May 2010; 17:21 UT
Password Certification: Jose L. Prieto (jose@obs.carnegiescience.edu)

Subjects: Infra-Red, Nova, Supernova, Transients
Referred to by ATEL #: 2633, 2637, 2639, 2640, 2642, 2648, 2658, 2660

We report the detection of a bright mid-IR source coincident with the position of SN 2010da (CBET #2289) in the nearby galaxy NGC 300 in archival images obtained with Spitzer/IRAC in Dec. 2007 (PI: R. Kennicutt). The candidate mid-IR progenitor of SN 2010da is in fact present at RA=00:55:04.88, DEC=-37:41:43.7 in the catalog of mid-IR sources in nearby galaxies published by Khan et al. (2010, ApJ, 715, 904). The mid-IR magnitudes and color of the progenitor are [3.6] = 15.95, [4.5] = 15.31, [3.6]-[4.5] = 0.64. Based on the location (M_4.5 = -11.1, [3.6]-[4.5]=0.6) of the progenitor in the mid-IR color-magnitude diagram (see Thompson et al. 2009, ApJ, 705, 1364), as well as the low luminosity of the transient (M_V ~ -10.3), SN 2010da should be an LBV in outburst.

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