English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We have obtained Spitzer Space Telescope Multiband Imaging Photometer forSpitzer (MIPS) 24 {\mu}m and 70 {\mu}m observations of 215 nearby, Hipparcos B-and A-type common proper motion single and binary systems in the nearest OBassociation, Scorpius-Centaurus. Combining our MIPS observations with those ofother ScoCen stars in the literature, we estimate 24 {\mu}m B+A-type diskfractions of 17/67 (25+6%), 36/131 (27+4%), and 23/95 (24+5%) for UpperScorpius (\sim11 Myr), Upper Centaurus Lupus (\sim15 Myr), and Lower CentaurusCrux (\sim17 Myr), respectively, somewhat smaller disk fractions thanpreviously obtained for F- and G-type members. We confirm previous IRAS excessdetections and present new discoveries of 51 protoplanetary and debris disksystems, with fractional infrared luminosities ranging from LIR/L\ast = 1e-6 to1e-2 and grain temperatures ranging from Tgr = 40 - 300 K. In addition, weconfirm that the 24 {\mu}m and 70 {\mu}m excesses (or fractional infraredluminosities) around B+A type stars are smaller than those measured toward F+Gtype stars and hypothesize that the observed disk property dependence onstellar mass may be the result of a higher stellar companion fraction around B-and A-type stars at 10 - 200 AU and/or the presence of Jupiter-mass companionsin the disks around F- and G- type stars. Finally, we note that the majority ofthe ScoCen 24 {\mu}m excess sources also possess 12 {\mu}m excess, indicatingthat Earth-like planets may be forming via collisions in the terrestrial planetzone at \sim10 - 100 Myr.

A Spitzer MIPS Study of 2.5-2.0 M\odot Stars in Scorpius-Centaurus