Physics – Optics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop..244m&link_type=abstract
Spitzer Proposal ID #244
Physics
Optics
Scientific paper
This proposal consists of two parts related to the study of low-mass sub-stellar objects. In the first part, intend to obtain low-resolution IRS spectra and MIPS 50-160um data of a nearby young star surrounded by a newly-discovered debris disk, containing an embedded point source at 50 AU - a candidate planet. The system was discovered recently in the course of a ground- based adaptive optics survey for sub-stellar companions to young solar analogs. The AO images detect the disk in scattered light over 30-50 AU from the star. Through 5-38 micron IRS spectroscopy, sensitive to material at 1-20 AU from this sun-like star, I will be able to constrain the amount of dust and its composition at separations inaccessible through direct imaging. The MIPS 50-95um SED and 160um imaging data, combined with 24um and 70um GTO data, will constrain the temperature and amount of material in the resolved scattered light disk. The combination of imaging, spectroscopic and SED data over 1-160um will thus offer a unified picture of this intriguing system over orbital separations spanning the equivalents of the terrestrial and the ice giant zones in the Solar System. In the second part of the proposal, I will use 3-9 micron IRAC imaging to study the photospheres of newly-found candidate free-floating planetary-mass objects. I have identified such candidates from a positional and color cross-match between the SDSS and 2MASS surveys, aimed at discovering objects beyond the bottom of the T dwarf sequence, so-called Y dwarfs. All of the selected candidates are seen only in the SDSS z- and 2MASS J-bands, and thus have very red (i-z>3.0) optical and blue (J-Ks<1.0) near-IR colors, as is characteristic for late T dwarfs and as may also be expected for early Y dwarfs. If Y dwarfs are confirmed in the sample, their mid-IR colors of will constrain the abundances of the dominant molecular species (methane, ammonia, water) in their photospheres, and will allow a quantitative classification of this new spectral type.
No associations
LandOfFree
Circumstellar Disks and Sub-Stellar Objects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Circumstellar Disks and Sub-Stellar Objects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circumstellar Disks and Sub-Stellar Objects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1555293