The SDSS–2MASS–WISE 10-dimensional stellar colour locus

By James R. A. Davenport, Željko Ivezic´, A. Becker, J. Ruan, Nicholas M. Hunt-Walker, K. Covey, A. Lewis, Yusra AlSayyad, Lauren Anderson. 2014

59 citations recorded by the source corpus.

We present the fiducial main sequence stellar locus traced by 10 photometric colors observed by SDSS, 2MASS, and WISE. Median colors are determined using 1,052,793 stars with rband extinction less than 0.125. We use this locus to measure the dust extinction curve relative to the r-band, which is consistent with previous measurements in the SDSS and 2MASS bands. The WISE band extinction coefficients are larger than predicted by standard extinction models. Using 13 lines of sight, we find variations in the extinction curve in H, Ks, and WISE bandpasses. Relative extinction decreases towards Galactic anti-center, in agreement with prior studies. Relative extinction increases with Galactic latitude, in contrast to previous observations. This indicates a universal mid-IR extinction law does not exist due to variations in dust grain size and chemistry with Galactocentric position. A preliminary search for outliers due to warm circumstellar dust is also presented, using stars with high signal-to-noise in the W3-band. We find 199 such outliers, identified by excess emission in Ks W3. Inspection of SDSS images for these outliers reveals a large number of contaminants due to nearby galaxies. Six sources appear to be genuine dust candidates, yielding a fraction of systems with infrared excess of 0:12 0:05%.

Subfields: Astronomy and Astrophysics

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Citations in the corpus

• STELLAR AND PLANETARY PROPERTIES OF K2 CAMPAIGN 1 CANDIDATES AND VALIDATION OF 17 PLANETS, INCLUDING A PLANET RECEIVING EARTH-LIKE INSOLATION (2015, methodology): “We include the WISE bandpasses by applying the relative extinction values between SDSS, 2MASS, and WISE calculated by Davenport et al. (2014).”
• THE KEPLER CATALOG OF STELLAR FLARES (2016, methodology): “The FFD for the highly active, rapidly rotating M4 dwarf, GJ 1243, has been previously studied using Kepler data (Ramsay et al. 2013; Hawley et al. 2014; Davenport et al. 2014a).”