Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/36502
Title: X-RAY ECLIPSE DIAGNOSIS OF THE EVOLVING MASS LOSS IN THE RECURRENT NOVA U SCORPII 2010
Authors: Takei, D.
Drake, J. J.
Tsujimoto, M.
Ness, J-U.
Osborne, Julian Paul
Starrfield, S.
Kitamoto, S.
First Published: 2-May-2013
Publisher: IOP Publishing LTD
Citation: Astrophysical Journal Letters, 2013, 769 (1), L4
Abstract: We report the Suzaku detection of the earliest X-ray eclipse seen in the recurrent nova U Scorpii 2010. A target-of-opportunity observation 15 days after the outburst found a 27% ± 5% dimming in the 0.2-1.0 keV energy band at the predicted center of an eclipse. In comparison with the X-ray eclipse depths seen at two later epochs by XMM-Newton, the source region shrank by about 10%-20% between days 15 and 35 after the outburst. The X-ray eclipses appear to be deeper than or similar to contemporaneous optical eclipses, suggesting the X-ray and optical source region extents are comparable on day 15. We raise the possibility of the energy dependency in the photon escape regions, and that this would be a result of the supersoft X-ray opacity being higher than the Thomson scattering opacity at the photosphere due to bound-free transitions in abundant metals that are not fully ionized. Assuming a spherically symmetric model, we constrain the mass-loss rate as a function of time. For a ratio of actual to Thomson opacity of 10-100 in supersoft X-rays, we find an ejecta mass of about 10[Superscript: –7]-10[Superscript: –6] M ☉.
DOI Link: 10.1088/2041-8205/769/1/L4
ISSN: 2041-8205
eISSN: 2041-8213
Links: http://iopscience.iop.org/article/10.1088/2041-8205/769/1/L4/meta
http://hdl.handle.net/2381/36502
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2013. The American Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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