Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30396w&link_type=abstract
Spitzer Proposal ID #30396
Other
Scientific paper
Stars are born with gas and dust rich circumstellar disks that contain the raw materials for planets. These disks dissipate quickly, after about 3 Myr, leaving whatever planets and remnant planetesimals managed to form. It has been difficult to study the transition; because it is so short, very few objects are known that have, say, cleared their inner disks but are still in the process of clearing their outer disks. I have identified 25 stars that formed along with the well known Herbig AeBe star HD 141569; I call these, albeit uncreatively, the HD 141569 Association. The eponymous star, at an age of about 5 Myr, is one of those few disks seen in transition. It has dust, but only cooler than about 300 K. It has gas, but at less abundance, relative to the dust, than the interstellar medium. The other members of the association now provide a means for studying disks at this important transition time. Does the dust dissipation timescale depend on stellar luminosity? Do lower mass stars have lower mass disks? We can begin to answer these questions by examining the HD 141569 Association members for disks; therefore I propose MIPS observations of these 25 stars.
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