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Late-time observations of Type Ia supernovae (SNe Ia), >900 days afterexplosion, have shown that this type of SN does not suffer an "IR catastrophe"at 500 days as previously predicted. Instead, several groups have observed aslow-down in the optical light curves of these SNe. A few reasons have beensuggested for this slow-down, from a changing fraction of positrons reprocessedby the expanding ejecta, through a boost of energy from slow radioactive decaychains such as 57Co --> 57Fe, to atomic "freeze-out." Discovering which ofthese (or some other) heating mechanisms is behind the slow-down will directlyimpact studies of SN Ia progenitors, explosion models, and nebular-stagephysics. Recently, Graur et al. (2018) suggested a possible correlation betweenthe shape of the late-time light curves of four SNe Ia and their stretchvalues, which are proxies for their intrinsic luminosities. Here, we presentHubble Space Telescope observations of the SN Ia ASASSN-14lp at ~850-960 dayspast maximum light. With a stretch of s = 1.15 +/- 0.05, it is the mostluminous normal SN Ia observed so far at these late times. We rule outcontamination by light echoes and show that the late-time, optical light curveof ASASSN-14lp is flatter than that of previous SNe Ia observed at late times.This result is in line with-and strengthens-the Graur et al. (2018)correlation, but additional SNe are needed to verify it.

astrophysical journal/the astrophysical journal

Late-Time Observations of ASASSN-14lp Strengthen the Case for a  Correlation between the Peak Luminosity of Type Ia Supernovae and the Shape  of their Late-Time Light Curves