The supernova Ia 2011fe in M101, its tip of the red-giant branch (TRGB) distance, and the value of H0
Abstract
The light curve parameters of the normal type Ia SN2011fe are derived from the rich archive of the AAVSO. This leads, together with the TRGB distance modulus of (m-M) = 29.39 +/- 0.05 of the parent galaxy M101, to maximum magnitudes of the unreddened SN of MB = -19.45 +/- 0.08, MV = -19.46 +/- 0.08, and MI = -19.25 +/- 0.06 (for the standard decline rate of Delta m15 = 1.1). When these values are inserted into the Hubble line defined by 62 SNe Ia with 3000 < v < 20,000 km/s - and considering also four other SNe Ia with TRGB distances - one obtains a large-scale value of the Hubble constant of H0 = 64.3 +/- 1.9 +/- 3.2. This value can be much improved in the future by using only TRGB distances of SNe Ia.
Turn this paper into a lesson
ArcXiv compiles a structured reading guide from this paper's metadata: plain-English importance, contributions, prerequisite concepts, which sections to read first, flashcards, and a quiz. Grounded in the abstract, never invented.