eprintid: 1477406 rev_number: 24 eprint_status: archive userid: 608 dir: disk0/01/47/74/06 datestamp: 2016-07-01 15:42:03 lastmod: 2021-10-20 23:55:10 status_changed: 2017-07-13 15:50:54 type: article metadata_visibility: show creators_name: Jura, M creators_name: Farihi, J creators_name: Zuckerman, B creators_name: Becklin, EE title: Infrared emission from the dusty disk orbiting GD 362, an externally polluted white dwarf ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F60 keywords: circumstellar matter; minor planets, asteroids; white dwarfs note: Copyright © 2007. The American Astronomical Society. All rights reserved. abstract: We report Spitzer Space Telescope photometry between 3.6 and 24 μm and spectroscopy between 5 and 15 μm of GD 362, a white dwarf with an effective temperature near 10,000 K that displays a remarkably high concentration of metals in its photosphere and a thermal infrared excess. We approximately reproduce both the infrared continuum and the very strong 10 μm silicate emission feature with a model of an orbiting dusty disk that is flat out to 50 stellar radii and warped between 50 and 70 stellar radii. The relatively small amount of cold material implied by the weak 24 μm flux argues that the disk lies within the Roche radius of the star, and we may be witnessing a system where an asteroidal-size body has been tidally destroyed. If so, determination of the photospheric metal abundances may measure the bulk composition of an extrasolar minor planet. date: 2007-05-01 date_type: published official_url: http://dx.doi.org/10.1086/512734 oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green article_type_text: Journal Article verified: verified_manual elements_id: 1105563 doi: 10.1086/512734 lyricists_name: Farihi, Jay lyricists_id: JFARI07 actors_name: Farihi, Jay actors_id: JFARI07 actors_role: owner full_text_status: public publication: Astronomical Journal volume: 133 number: 5 pagerange: 1927-1933 issn: 0004-6256 citation: Jura, M; Farihi, J; Zuckerman, B; Becklin, EE; (2007) Infrared emission from the dusty disk orbiting GD 362, an externally polluted white dwarf. Astronomical Journal , 133 (5) pp. 1927-1933. 10.1086/512734 <https://doi.org/10.1086/512734>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1477406/1/Farihi_205664.web.pdf