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On 2014 Dec. 9.61, the All-Sky Automated Survey for SuperNovae (ASAS-SN or"Assassin") discovered ASASSN-14lp just $\sim2$ days after first light using aglobal array of 14-cm diameter telescopes. ASASSN-14lp went on to become abright supernova ($V = 11.94$ mag), second only to SN 2014J for the year. Wepresent prediscovery photometry (with a detection less than a day after firstlight) and ultraviolet through near-infrared photometric and spectroscopic datacovering the rise and fall of ASASSN-14lp for more than 100 days. We find thatASASSN-14lp had a broad light curve ($\Delta m_{15}(B) = 0.80 \pm 0.05$), a$B$-band maximum at $2457015.82 \pm 0.03$, a rise time of $16.94^{+ 0.11 }_{-0.10 }$ days, and moderate host--galaxy extinction ($E(B-V)_{\textrm{host}} =0.33 \pm 0.06$). Using ASASSN-14lp we derive a distance modulus for NGC 4666 of$\mu = 30.8 \pm 0.2$ corresponding to a distance of $14.7 \pm 1.5$ Mpc.However, adding ASASSN-14lp to the calibrating sample of Type Ia supernovaestill requires an independent distance to the host galaxy. Finally, using ourearly-time photometric and spectroscopic observations, we rule out red giantsecondaries and, assuming a favorable viewing angle and explosion time, anynon-degenerate companion larger than $0.34 R_{\textrm{sun}}$.

astrophysical journal/the astrophysical journal

The Young and Bright Type Ia Supernova ASASSN-14lp: Discovery,  Early-Time Observations, First-Light Time, Distance to NGC 4666, and  Progenitor Constraints