The mid-infrared Leavitt Law for Classical Cepheids in the Magellanic Clouds

Research output: Contribution to journalArticlepeer-review

3 Citations (SciVal)
28 Downloads (Pure)


The Cepheid Leavitt Law (LL), also known as the Period-Luminosity relation, is a crucial tool for assembling the cosmic distance ladder. By combining data from the OGLE-IV catalogue with mid-infrared photometry from the Spitzer Space Telescope, we have determined the 3.6 and 4.5 $\mu$m LLs for the Magellanic Clouds using ∼5000 fundamental-mode classical Cepheids. Mean magnitudes were determined using a Monte Carlo Markov Chain (MCMC) template fitting procedure, with template light curves constructed from a subsample of these Cepheids with fully phased, well-sampled light curves. The dependence of the Large Magellanic Cloud LL coefficients on various period cuts was tested, in addition to the linearity of the relationship. The zero-point of the LL was calibrated using the parallaxes of Milky Way Cepheids from the Hubble Space Telescope and Gaia Data Release 2. Our final calibrated relations are M[3.6] =-3.246(±0.008)(log (P)-1.0)-5.784(±0.030) and M[4.5] =-3.162(±0.008)(log (P)-1.0)-5.751(±0.030).

Original languageEnglish
Pages (from-to)817-837
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date27 Oct 2020
Publication statusPublished - 31 Jan 2021


  • Magellanic Clouds
  • infrared: stars
  • stars: variables: Cepheids

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'The mid-infrared Leavitt Law for Classical Cepheids in the Magellanic Clouds'. Together they form a unique fingerprint.

Cite this