The Absence of Cold Dust around Warm Debris Disk Star HD 15407A
Abstract
We report Herschel and AKARI photometric observations at far-infrared (FIR) wavelengths of the debris disk around the F3V star HD 15407A, in which the presence of an extremely large amount of warm dust (~500-600 K) has been suggested by mid-infrared (MIR) photometry and spectroscopy. The observed flux densities of the debris disk at 60-160 micron are clearly above the photospheric level of the star, suggesting excess emission at FIR as well as at MIR wavelengths previously reported. The observed FIR excess emission is consistent with the continuum level extrapolated from the MIR excess, suggesting that it originates in the inner warm debris dust and cold dust (~50-130 K) is absent in the outer region of the disk. The absence of cold dust does not support a late heavy bombardment-like event as an origin of the large amount of warm debris dust around HD 15047A.
Keywords
Cite
@article{arxiv.1210.0587,
title = {The Absence of Cold Dust around Warm Debris Disk Star HD 15407A},
author = {Hideaki Fujiwara and Takashi Onaka and Satoshi Takita and Takuya Yamashita and Misato Fukagawa and Daisuke Ishihara and Hirokazu Kataza and Hiroshi Murakami},
journal= {arXiv preprint arXiv:1210.0587},
year = {2015}
}
Comments
6 pages, 2 figures, accepted for publication in The Astrophysical Journal Letters