An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST

Ruoyi Zhang; Haibo Yuan; Bowen Huang; Tao Wang; Lin Yang; Gregory M. Green; Xiangyu Zhang

doi:10.3847/1538-4357/ad613e

The Astrophysical Journal (Jan 2024)

An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST

Ruoyi Zhang,
Haibo Yuan,
Bowen Huang,
Tao Wang,
Lin Yang,
Gregory M. Green,
Xiangyu Zhang

Affiliations

Ruoyi Zhang: ORCiD; Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University , Beijing 102206, People's Republic of China ; [email protected]; School of Physics and Astronomy, Beijing Normal University , No.19, Xinjiekouwai St, Haidian District, Beijing 100875, People's Republic of China; Max Planck Institute for Astronomy , Königstuhl 17, Heidelberg D-69117, Germany
Haibo Yuan: ORCiD; Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University , Beijing 102206, People's Republic of China ; [email protected]; School of Physics and Astronomy, Beijing Normal University , No.19, Xinjiekouwai St, Haidian District, Beijing 100875, People's Republic of China
Bowen Huang: ORCiD; Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University , Beijing 102206, People's Republic of China ; [email protected]; School of Physics and Astronomy, Beijing Normal University , No.19, Xinjiekouwai St, Haidian District, Beijing 100875, People's Republic of China
Tao Wang: ORCiD; Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University , Beijing 102206, People's Republic of China ; [email protected]; School of Physics and Astronomy, Beijing Normal University , No.19, Xinjiekouwai St, Haidian District, Beijing 100875, People's Republic of China
Lin Yang: ORCiD; Department of Cyber Security, Beijing Electronic Science and Technology Institute , Beijing 100070, People's Republic of China
Gregory M. Green: Max Planck Institute for Astronomy , Königstuhl 17, Heidelberg D-69117, Germany
Xiangyu Zhang: ORCiD; Max Planck Institute for Astronomy , Königstuhl 17, Heidelberg D-69117, Germany

DOI: https://doi.org/10.3847/1538-4357/ad613e
Journal volume & issue: Vol. 971, no. 2
p. 127

Abstract

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We present a direct measurement of extinction curves using corrected Gaia XP spectra of the common sources in Gaia DR3 and LAMOST DR7. Our analysis of approximately 370,000 high-quality samples yielded a high-precision average extinction curve for the Milky Way. After incorporating infrared photometric data from Two Micron All Sky Survey and Wide-field Infrared Survey Explorer, the extinction curve spans wavelengths from 0.336 to 4.6 μ m. We determine an average R _55 of 2.730 ± 0.007, corresponding to R _V = 3.073 ± 0.009, and a near-infrared power-law index α of 1.935 ± 0.037. Our study confirmed some intermediate-scale structures within the optical range. One new feature was identified at 540 nm, and its intensity exhibited a correlation with extinction. This extinction curve can be used to investigate the characteristics of dust and enhance the extinction correction of Milky Way stars. A Python package for this extinction curve is available.

Published in The Astrophysical Journal

ISSN: 1538-4357 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Astronomy: Astrophysics
Website: https://iopscience.iop.org/journal/0004-637X

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