THE YOUNG AND BRIGHT TYPE IA SUPERNOVA ASASSN-14lp: DISCOVERY, EARLY-TIME OBSERVATIONS, FIRST-LIGHT TIME, DISTANCE TO NGC 4666, AND PROGENITOR CONSTRAINTS

ABSTRACT On 2014 December 9.61, the All-sky Automated Survey for SuperNovae (ASAS-SN or "Assassin") discovered ASASSN-14lp just ∼2 days after first light using a global array of 14 cm diameter telescopes. ASASSN-14lp went on to become a bright supernova (V = 11.94 mag), second only to SN 2...

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Published in:	The Astrophysical journal Vol. 826; no. 2; p. 144
Main Authors:	Shappee, B. J., Piro, A. L., Holoien, T. W.-S., Prieto, J. L., Contreras, C., Itagaki, K., Burns, C. R., Kochanek, C. S., Stanek, K. Z., Alper, E., Basu, U., Beacom, J. F., Bersier, D., Brimacombe, J., Conseil, E., Danilet, A. B., Dong, Subo, Falco, E., Grupe, D., Hsiao, E. Y., Kiyota, S., Morrell, N., Nicolas, J., Phillips, M. M., Pojmanski, G., Simonian, G., Stritzinger, M., Szczygie, D. M., Taddia, F., Thompson, T. A., Thorstensen, J., Wagner, M. R., Wo niak, P. R.
Format:	Journal Article
Language:	English
Published:	United States The American Astronomical Society 01-08-2016 Institute of Physics (IOP)
Subjects:	Arrays ASASSN-14lp ASTRONOMY AND ASTROPHYSICS Calibration Galaxies galaxies: distances and redshifts NGC 4666 Photometry Progenitors (astrophysics) Spectroscopy Supernovae supernovae: individual (ASASSN-14lp supernovae: individual (ASASSN-14lp, Type Ia, NGC 4666, ASASSN-14lp) Texts Type Ia white dwarfs
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Summary:	ABSTRACT On 2014 December 9.61, the All-sky Automated Survey for SuperNovae (ASAS-SN or "Assassin") discovered ASASSN-14lp just ∼2 days after first light using a global array of 14 cm diameter telescopes. ASASSN-14lp went on to become a bright supernova (V = 11.94 mag), second only to SN 2014J for the year. We present prediscovery photometry (with a detection less than a day after first light) and ultraviolet through near-infrared photometric and spectroscopic data covering the rise and fall of ASASSN-14lp for more than 100 days. We find that ASASSN-14lp had a broad light curve ( ), a B-band maximum at 2457015.82 0.03, a rise time of days, and moderate host-galaxy extinction ( ). Using ASASSN-14lp, we derive a distance modulus for NGC 4666 of , corresponding to a distance of 14.7 1.5 Mpc. However, adding ASASSN-14lp to the calibrating sample of Type Ia supernovae still requires an independent distance to the host galaxy. Finally, using our early-time photometric and spectroscopic observations, we rule out red giant secondaries and, assuming a favorable viewing angle and explosion time, any nondegenerate companion larger than 0.34 .
Bibliography:	ApJ100361 Cosmology ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 USDOE Laboratory Directed Research and Development (LDRD) Program AC52-06NA25396 LA-UR-15-25033
ISSN:	0004-637X 1538-4357 1538-4357
DOI:	10.3847/0004-637X/826/2/144