Pre-outburst $Chandra$ Observations of the Recurrent Nova T Pyxidis
Solen Balman (METU)

TL;DR
This study presents pre-outburst Chandra X-ray observations of T Pyxidis, revealing a high-temperature, inefficient boundary layer, extended nebular emission likely from past outflows, and insights into accretion processes during quiescence.
Contribution
It provides detailed spectral and spatial analysis of T Pyx during quiescence, suggesting an optically thin boundary layer with ADAF-like flow and characterizing the extended nebula from past outbursts.
Findings
High maximum plasma temperature (>37 keV) in quiescence.
Inefficient boundary layer emission with Lx/Ldisk ratio of (2-7)×10^{-4}.
Detection of extended nebular emission consistent with past outflow interactions.
Abstract
I present a total of 98.8 ksec ( 330 ksec) observation of T Pyx with the ACIS-S3 detector on-board the Observatory obtained during the quiescent phase, about 2-3 months before its outburst in April 2011. The total spectrum of the source T Pyx gives a maximum temperature kT 37.0 keV with (0.9-1.5) erg s cm and (1.3-2.2)10 erg s (at 3.5 kpc) in the 0.1-50 keV range using a multi-temperature plasma emission model (i.e., CEVMKL in XSPEC). I find a ratio of (L/L)(2-7)10 indicating considerable inefficiency of emission in the boundary layer. There is no blackbody emission with 2 upper limits kT 25 eV and L 2.010 erg s in the 0.1-10.0 keV band. All fits yield only interstellar N during quiescence. I…
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