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- W1569650687 abstract "We present results from an 850-$mu$m survey of the $sim$ 5 Myr old $lambda$ Orionis star-forming region. We used the SCUBA-2 camera on the James Clerk Maxwell Telescope to survey a $sim$0.5-diameter circular region containing 36 (out of 59) cluster members with infrared excesses indicative of circumstellar disks. We detected only one object at $>3sigma$ significance, the Herbig Ae star HD 245185, with a flux density of $sim74$ mJy beam$^{-1}$ corresponding to a dust mass of $sim150$ M$_{oplus}$. Stacking the individually undetected sources did not produce a significant mean signal but gives an upper limit on the average dust mass for $lambda$ Orionis disks of $sim3$ M$_{oplus}$. Our follow-up observations of HD 245185 with the Submillimeter Array found weak CO 2--1 line emission with an integrated flux of $sim170$ mJy km s$^{-1}$ but no $^{13}$CO or C$^{18}$O isotopologue emission at 30 mJy km s$^{-1}$ sensitivity, suggesting a gas mass of $lesssim1$ M$_{rm Jup}$. The implied gas-to-dust ratio is thus $gtrsim50$ times lower than the canonical interstellar medium value, setting HD 245185 apart from other Herbig Ae disks of similar age, which have been found to be gas rich; as HD 245185 also shows signs of accretion, we may be catching it in the final phases of disk clearing. Our study of the $lambda$ Orionis cluster places quantitative constraints on planet formation timescales, indicating that at $sim5$ Myr the average disk no longer has sufficient dust and gas to form giant planets and perhaps even super Earths; the bulk material has been mostly dispersed or is locked in pebbles/planetesimals larger than a few mm in size." @default.
- W1569650687 created "2016-06-24" @default.
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- W1569650687 date "2015-05-01" @default.
- W1569650687 modified "2023-09-27" @default.
- W1569650687 title "A SCUBA-2 850-$mu$m survey of circumstellar disks in the $lambda$ Orionis cluster" @default.
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