THE DISK POPULATION OF THE UPPER SCORPIUS ASSOCIATION

By K. Luhman, Eric Mamajek. 2012

153 citations recorded by the source corpus.

We present photometry at 3–24 μm for all known members of the Upper Scorpius association (τ ∼ 11 Myr) based on all images of these objects obtained with the Spitzer Space Telescope and the Wide-field Infrared Survey Explorer. We have used these data to identify the members that exhibit excess emission from circumstellar disks and estimate the evolutionary stages of these disks. Through this analysis, we have found ∼50 new candidates for transitional, evolved, and debris disks. The fraction of members harboring inner primordial disks is ≲ 10% for B–G stars (M > 1.2 M☉) and increases with later types to a value of ∼25% at ≳M5 (M ≲ 0.2 M☉), in agreement with the results of previous disk surveys of smaller samples of Upper Sco members. These data indicate that the lifetimes of disks are longer at lower stellar masses and that a significant fraction of disks of low-mass stars survive for at least ∼10 Myr. Finally, we demonstrate that the distribution of excess sizes in Upper Sco and the much younger Taurus star-forming region (τ ∼ 1 Myr) is consistent with the same, brief timescale for clearing of inner disks.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/e99b034ed19e7926784bcd8a4305f199586a617f

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In Astronomy and Astrophysics

1. A. Mann
2. A. Kraus
3. Michael C. Liu
4. E. Gaidos
5. Michael J. Ireland
6. D. Charbonneau
7. Eric Mamajek
8. M. Pecaut

Citations in the corpus

• ZODIACAL EXOPLANETS IN TIME (ZEIT). III. A SHORT-PERIOD PLANET ORBITING A PRE-MAIN-SEQUENCE STAR IN THE UPPER SCORPIUS OB ASSOCIATION (2016, methodology): “This excess corresponds to that of debris disks, not an evolved disk, according to the classification of Luhman & Mamajek (2012).”
• The star formation history and accretion-disc fraction among the K-type members of the Scorpius–Centaurus OB association (2016, methodology): “Finally, we note that our K-type disk fraction is larger than what is observed for the higher mass-stars in the same subgroups (Mamajek et al. 2002; Pecaut et al. 2012; Carpenter et al. 2009; Luhman & Mamajek 2012).”
• A STELLAR CENSUS OF THE TUCANA–HOROLOGIUM MOVING GROUP (2014, methodology): “Based on the criteria suggested by Luhman & Mamajek (2012), all targets are Class III (diskless) sources with W1 − W3 1.”