Please use this identifier to cite or link to this item:
|Title:||Collimation and Asymmetry of the Hot Blast Wave from the Recurrent Nova V745 Sco||Authors:||Drake, Jeremy J.
Laming, J. Martin
Page, Kim L.
Ness, J. -U.
Gehrz, R. D.
van Rossum, Daan
Woodward, Charles E.
|Issue Date:||2016||Journal:||THE ASTROPHYSICAL JOURNAL||Number:||825||Issue:||2||First Page:||95||Abstract:||The recurrent symbiotic nova V745 Sco exploded on 2014 February 6 and was observed on February 22 and 23 by the Chandra X-ray Observatory Transmission Grating Spectrometers. By that time the supersoft source phase had already ended, and Chandra spectra are consistent with emission from a hot, shock-heated circumstellar medium with temperatures exceeding 10<SUP>7</SUP> K. X-ray line profiles are more sharply peaked than expected for a spherically symmetric blast wave, with a full width at zero intensity of approximately 2400 km s<SUP>-1</SUP>, an FWHM of 1200 ± 30 km s<SUP>-1</SUP>, and an average net blueshift of 165 ± 10 km s<SUP>-1</SUP>. The red wings of lines are increasingly absorbed toward longer wavelengths by material within the remnant. We conclude that the blast wave was sculpted by an aspherical circumstellar medium in which an equatorial density enhancement plays a role, as in earlier symbiotic nova explosions. Expansion of the dominant X-ray-emitting material is aligned close to the plane of the sky and is most consistent with an orbit seen close to face-on. Comparison of an analytical blast wave model with the X-ray spectra, Swift observations, and near-infrared line widths indicates that the explosion energy was approximately 10<SUP>43</SUP> erg and confirms an ejected mass of approximately 10<SUP>-7</SUP> M <SUB>☉</SUB>. The total mass lost is an order of magnitude lower than the accreted mass required to have initiated the explosion, indicating that the white dwarf is gaining mass and is a Type Ia supernova progenitor candidate.||URI:||http://hdl.handle.net/20.500.12386/24760||URL:||https://iopscience.iop.org/article/10.3847/0004-637X/825/2/95||ISSN:||0004-637X||DOI:||10.3847/0004-637X/825/2/95||Bibcode ADS:||2016ApJ...825...95D||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
Show full item record
Files in This Item:
|Drake_2016_ApJ_825_95.pdf||PDF editoriale||1.77 MB||Adobe PDF||View/Open|
checked on Sep 24, 2020
checked on Sep 24, 2020
Items in DSpace are published in Open Access, unless otherwise indicated.