A Linear Relation between the Color Stretch sBV and the Rising Color Slope s0*(B−V) of Type Ia Supernovae

Ping Chen, Subo Dong, Chris Ashall, S. Benetti, D. Bersier, S. Bose, Joseph Brimacombe, Thomas G. Brink, David A.H. Buckley, Enrico Cappellaro, Grant W. Christie, N. Elias-Rosa, Alexei V. Filippenko, Mariusz Gromadzki, Thomas W.S. Holoien, Shaoming Hu, C. S. Kochanek, Robert Koff, Juna A. Kollmeier, P. LundqvistS. Mattila, Peter A. Milne, J. A. Muñoz, Robert Mutel, Tim Natusch, Joel Nicolas, A. Pastorello, Simon Prentice, J. L. Prieto, Tyler Roth, B. J. Shappee, Geoffrey Stone, K. Z. Stanek, M. D. Stritzinger, Todd A. Thompson, Lina Tomasella, Steven Villanueva

Research output: Contribution to journalArticlepeer-review


Using data from the Complete Nearby (redshift z host < 0.02) sample of Type Ia Supernovae (CNIa0.02), we find 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, 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 Δm 15(B). Thus, our new linear relation can be used to infer peak luminosity from s 0 * . Unlike s BV (or Δm 15(B)), the measurement of s 0 * ( B − V ) does not rely on a well-determined time of light-curve peak or color maximum, making it less demanding on the light-curve coverage than past approaches.

Original languageEnglish (US)
Article number101
JournalAstrophysical Journal
Issue number2
StatePublished - Apr 1 2023

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'A Linear Relation between the Color Stretch sBV and the Rising Color Slope s0*(B−V) of Type Ia Supernovae'. Together they form a unique fingerprint.

Cite this