학술논문
A Linear Relation Between the Color Stretch $s_{BV}$ and the Rising Color Slope $s_0^*(B-V)$ of Type Ia Supernovae
Document Type
Working Paper
Author
Chen, Ping; Dong, Subo; Ashall, Chris; Benetti, S.; Bersier, D.; Bose, S.; Brimacombe, Joseph; Brink, Thomas G.; Buckley, David A. H.; Cappellaro, Enrico; Christie, Grant W.; Elias-Rosa, N.; Filippenko, Alexei V.; Gromadzki, Mariusz; Holoien, Thomas W. -S.; Hu, Shaoming; Kochanek, C. S.; Koff, Robert; Kollmeier, Juna A.; Lundqvist, P.; Mattila, S.; Milne, Peter A.; Munoz, J. A.; Mutel, Robert; Natusch, Tim; Nicolas, Joel; Pastorello, A.; Prentice, Simon; Prieto, J. L.; Roth, Tyler; Shappee, B. J.; Stone, Geoffrey; Stanek, K. Z.; Stritzinger, M. D.; Thompson, Todd A.; Tomasella, Lina; Villanueva, Steven
Source
Subject
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Abstract
Using data from the Complete Nearby ($z_{host}<0.02$) sample of Type Ia Supernovae (CNIa0.02), we discover a linear relation between two parameters derived from the $B-V$ color curves of Type Ia supernovae: the "color stretch" $s_{BV}$ and the rising color slope $s_0^*(B-V)$ after the peak, and this relation applies to the full range of $s_{BV}$. The $s_{BV}$ parameter is known to be tightly correlated with the peak luminosity, and especially for "fast decliners" (dim Type Ia supernovae), and the luminosity correlation with $s_{BV}$ is markedly better than with the classic light-curve width parameters such as $\Delta{m_{15}(B)}$. Thus our new linear relation can be used to infer peak luminosity from $s_0^*$. Unlike $s_{BV}$ (or $\Delta{m_{15}}$), the measurement of $s_0^*(B-V)$ does not rely on the well-determined time of light-curve peak or color maximum, making it less demanding on the light-curve coverage than past approaches.
Comment: Submitted to AAS Journals, 7 pages, 4 figures
Comment: Submitted to AAS Journals, 7 pages, 4 figures