Inferring the size scales of planetary systems using resolved debris discs

Marshall, J. P. and Pawellek, N. and Kennedy, G. M. and Scicluna, P. and Krivov, A. V. (2019) Inferring the size scales of planetary systems using resolved debris discs. Memorie della Societa Astronomica Italiana, 90 (4). pp. 543-548. ISSN 0037-8720


Abstract

Circumstellar debris discs are tenuous remnant rings of icy and rocky material left over from planet(esimal) formation processes around their host stars. Possible relationships between stellar luminosity and disc parameters have been examined. Based on analysis of a sample of 39 spatially resolved debris discs at infrared wavelengths by Herschel, a trend between stellar luminosities (L_star ) and the ratio of the discs' resolved radii (R_d) to blackbody radii (R_bb) was noted. We have examined a larger sample of resolved debris discs from archival far-infrared Herschel observations in order to determine the fidelity of that trend. We further examine whether the inferred extents of these discs are consistent with self-stirring models or may be indicative of dynamical perturbation by a planetary companion. Disc radii were determined by fitting the source brightness profiles with simple annular disc models convolved with a PSF. We obtain good agreement between the resolved extent of debris discs as measured at millimetre wavelengths and the estimates based on L_star and R_d/R_bb at far-infrared wavelengths, suggesting that the measured trend is a fair, albeit imperfect, predictor of actual disc extent. In future work we will apply this revised relationship to the larger sample of unresolved debris discs in an attempt to identify systems that exhibit evidence of stirring by a planetary companion.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Computational Engineering and Science Research Centre (CESRC) (1 Jul 2013 - 31 Jul 2018)
Faculty/School / Institute/Centre: Historic - Computational Engineering and Science Research Centre (CESRC) (1 Jul 2013 - 31 Jul 2018)
Date Deposited: 06 Jul 2022 00:03
Last Modified: 07 Jul 2022 03:27
Uncontrolled Keywords: Stars: circumstellar matter; stars: planetary systems
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020108 Planetary Science (excl. Extraterrestrial Geology)
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020109 Space and Solar Physics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
51 PHYSICAL SCIENCES > 5199 Other physical sciences > 519999 Other physical sciences not elsewhere classified
URI: http://eprints.usq.edu.au/id/eprint/49410

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