TY - JOUR
T1 - The expanding photosphere method applied to SN 1992am AT cz = 14 600 km/s
AU - Schmidt, Brian P.
AU - Kirshner, Robert P.
AU - Eastman, Ronald G.
AU - Hamuy, Mario
AU - Phillips, Mark M.
AU - Suntzeff, Nicholas B.
AU - Maza, Jose
AU - Filippenko, Alexei V.
AU - Ho, Luis C.
AU - Matheson, Thomas
AU - Grashuis, Randy
AU - Aviles, Roberto
AU - Kirkpatrick, J. Davy
AU - Challis, Peter
AU - Kuijken, Konrad
AU - Zucker, Daniel
AU - Bolte, Michael
AU - Tyson, Neil D.
PY - 1994/4
Y1 - 1994/4
N2 - We present photometry and spectroscopy of SN 1992am for five months following its discovery by the Calan/CTIO SN search. These data show SN 1992am to be type II-P, displaying hydrogen in its spectrum and the typical shoulder in its light curve. The photometric data and the distance from our own analysis are used to construct the supernova's bolometric light curve. Using the bolometric light curve, we estimate SN 1992am ejected approximately 0.30Script M sign⊙ of 56Ni, an amount four times larger than that of other well studied SNe II. SN 1992am's; host galaxy lies at a redshift of cz = 14 600 km s-1, making it one of the most distant SNe II discovered, and an important application of the Expanding Photosphere Method. Since z=0.05 is large enough for redshift-dependent effects to matter, we develop the technique to derive luminosity distances with the Expanding Photosphere Method at any redshift, and apply this method to SN 1992am. The derived distance, D=180+30
-25 Mpc, is independent of all other rungs in the extragalactic distance ladder. The redshift of SN 1992am's host galaxy is sufficiently large that uncertainties due to perturbations in the smooth Hubble flow should be smaller than 10%. The Hubble ratio derived from the distance and redshift of this single object is H0=81+17-15 km s-1 Mpc-1. In the future, with more of these distant objects, we hope to establish an independent and statistically robust estimate of H0 based solely on type II supernovae.
AB - We present photometry and spectroscopy of SN 1992am for five months following its discovery by the Calan/CTIO SN search. These data show SN 1992am to be type II-P, displaying hydrogen in its spectrum and the typical shoulder in its light curve. The photometric data and the distance from our own analysis are used to construct the supernova's bolometric light curve. Using the bolometric light curve, we estimate SN 1992am ejected approximately 0.30Script M sign⊙ of 56Ni, an amount four times larger than that of other well studied SNe II. SN 1992am's; host galaxy lies at a redshift of cz = 14 600 km s-1, making it one of the most distant SNe II discovered, and an important application of the Expanding Photosphere Method. Since z=0.05 is large enough for redshift-dependent effects to matter, we develop the technique to derive luminosity distances with the Expanding Photosphere Method at any redshift, and apply this method to SN 1992am. The derived distance, D=180+30
-25 Mpc, is independent of all other rungs in the extragalactic distance ladder. The redshift of SN 1992am's host galaxy is sufficiently large that uncertainties due to perturbations in the smooth Hubble flow should be smaller than 10%. The Hubble ratio derived from the distance and redshift of this single object is H0=81+17-15 km s-1 Mpc-1. In the future, with more of these distant objects, we hope to establish an independent and statistically robust estimate of H0 based solely on type II supernovae.
UR - http://www.scopus.com/inward/record.url?scp=0001285718&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0001285718
SN - 0004-6256
VL - 107
SP - 1444
EP - 1452
JO - Astronomical Journal
JF - Astronomical Journal
IS - 4
ER -