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Table 2.

Derived parameters of SN 2018is for the EPM distance estimate: the angular size (θ), photospheric temperature (T), and the interpolated photospheric velocity (vph).

t( † ) θBV TBV θBVI TBVI θVI TVI vph
(days) (109 km Mpc−1) (K) (109 km Mpc−1) (K) (109 km Mpc−1) (K) (km s−1)
4.6 1.78 (0.09) 13208 (767) 1.25 (0.08) 16609 (923) 0.96 (0.07) 19347 (1019) 3967 (357)
22.4 2.84 (0.06) 8027 (210) 2.48 (0.08) 9695 (256) 2.05 (0.16) 11766 (741) 2322 (252)
25.7 3.16 (0.08) 6941 (253) 2.70 (0.13) 8866 (403) 2.03 (0.23) 12027 (1084) 2242 (303)
27.0 3.16 (0.11) 6213 (177) 3.03 (0.09) 7438 (188) 2.45 (0.33) 10077 (1399) 2060 (291)
35.7 3.22 (0.03) 6128 (64) 3.18 (0.04) 7165 (102) 2.59 (0.11) 9747 (383) 1944 (261)
41.5 3.23 (0.02) 5503 (224) 3.22 (0.05) 6511 (268) 2.74 (0.37) 9164 (1123) 1763 (272)
45.2 3.24 (0.02) 5764 (159) 3.21 (0.03) 6778 (181) 2.82 (0.23) 9092 (610) 1649 (313)

Notes. ( † )Since discovery, t0 = JD 2458136.2.

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