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Title: EVIDENCE FOR GAS FROM A DISINTEGRATING EXTRASOLAR ASTEROID

We report high-resolution spectroscopic observations of WD 1145+017—a white dwarf that was recently found to be transitted by multiple asteroid-sized objects within its tidal radius. We discovered numerous circumstellar absorption lines with linewidths of ∼300 km s{sup −1} from Mg, Ca, Ti, Cr, Mn, Fe, and Ni, possibly from several gas streams produced by collisions among the actively disintegrating objects. The atmosphere of WD 1145+017 is polluted with 11 heavy elements, including O, Mg, Al, Si, Ca, Ti, V:, Cr, Mn, Fe, and Ni. Evidently, we are witnessing the active disintegration and subsequent accretion of an extrasolar asteroid.
Authors:
 [1] ; ;  [2] ;  [3]
  1. European Southern Observatory, Karl-Schwarzschild-Straße 2, D-85748 Garching (Germany)
  2. Department of Physics and Astronomy, University of California, Los Angeles CA 90095-1562 (United States)
  3. Institut de Recherche sur les Exoplanètes (iREx), Université de Montréal, Montréal, QC H3C 3J7 (Canada)
Publication Date:
OSTI Identifier:
22518636
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 816; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; ABSORPTION SPECTRA; ALUMINIUM; ASTEROIDS; COLLISIONS; ELEMENT ABUNDANCE; IRON; LINE WIDTHS; MAGNESIUM; MANGANESE; OXYGEN; PLANETS; RESOLUTION; SILICON; STAR ACCRETION; STELLAR ATMOSPHERES; WHITE DWARF STARS