Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30319f&link_type=abstract
Spitzer Proposal ID #30319
Other
Scientific paper
In the past year, several programs have demonstrated that IRACcan provide extremely accurate and stable time-series photometry. This scientific capability has so far been used to detect the thermal emission of extra-solar planets and to attempt to detect cloud formations in the photospheres of brown dwarfs (brown dwarf "weather"). We believe there is another topic where IRAC's very stable photometry can break new ground. We propose to use IRAC to monitor a set of 50-100 very young PMS stars in the embedded star-forming region of the Serpens cloud core. Most of the stars in this region are too embedded to monitor at optical wavelengths. Monitoring could be done from the ground in the near-IR, but we believe the much better stability (both photometric and PSF width/shape) provided by IRAC will allow fundamentally different science to be considered with our Spitzer data. The variability of PMS stars has been the subject of considerable effort in the optical and in the near-IR, but this will be the first significant attempt with IRAC and by far the most sensitive PMS star monitoring program ever attempted in the mid-IR. Based on previous optical and near-IR efforts, we expect to see variability due to rotational modulation and flaring. We hope in addition we will be able to measure or place limits on the time variability of the accretion onto the star as reflected by the contribution to the system light of the inner disk wall. We regard this as an exploratory program - if we detect variability in a significant fraction of the Serpens members and if we can tie that variability to specific mechanisms that provide new insight into how stars are assembled, then we expect our observations will encourage others to propose similar programs for other regions.
Allen Lori
Barrado Navascués David Y.
Fazio Giovanni
Megeath Tom S.
Rebull Luisa
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