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

TL;DR
This paper presents a high-precision, empirically derived average extinction curve for the Milky Way using Gaia XP spectra and LAMOST data, revealing new features and providing a tool for dust analysis.
Contribution
It introduces the first high-precision empirical extinction curve based on Gaia and LAMOST spectra, including new features at 540 and 769 nm, and offers a Python package for practical use.
Findings
Average R_V of 3.073 with high precision
Identification of new extinction features at 540 and 769 nm
Correlation of feature intensities with extinction and R_V
Abstract
We present a direct measurement of extinction curves using corrected XP spectra of the common sources in DR3 and LAMOST DR7. Our analysis of approximately 370 thousand high-quality samples yielded a high-precision average extinction curve for the Milky Way. After incorporating infrared photometric data from 2MASS and WISE, the extinction curve spans wavelengths from 0.336 to 4.6 m. We determine an average of , corresponding to , and a near-infrared power-law index of . Our study confirmed some intermediate-scale structures within the optical range. Two new features were identified at 540 and 769 nm, and their intensities exhibited a correlation with extinction and . This extinction curve can be used to investigate the characteristics of dust and enhance the extinction correction of Milky…
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Taxonomy
TopicsGeophysics and Gravity Measurements · Earth Systems and Cosmic Evolution
