Surina, F and Hounsell, RA and Bode, MF and Darnley, MJ and Harman, DJ and Walter, FM Spectroscopic and Photometric Development of T Pyxidis (2011) from 0.8 to 250 Days After Discovery. In: Astronomical Society of the Pacific Conference Series , 490. p. 169. (Stella Novae: Past and Future Decades, 4th-8th February 2013, Cape Town, South Africa).
1303.6592v3.pdf - Accepted Version
We investigated the optical light curve of T Pyx during its 2011 outburst through compiling a database of SMEI and AAVSO observations. The SMEI light curve, providing unprecedented detail with high cadence data during t=1.5-49 days post-discovery, was divided into four phases based on the idealised nova optical light curve; the initial rise, the pre-maximum halt (or the 'plateau'), the final rise, and the early decline. Variation in the SMEI light curve reveals a strongly detected period of 1.44\pm0.04 days before the visual maximum. The spectra from the LT and SMARTS telescopes were investigated during t=0.8-80.7 and 155.1-249.9 days. The nova was observed very early in its rise and a distinct high velocity ejection phase was evident. A marked drop and then gradual increase in derived ejection velocities were present. Here we propose two different stages of mass loss, a short-lived phase occurring immediately after outburst followed by a more steadily evolving and higher mass loss phase. The overall spectral development follows that typical of a Classical Nova and comparison to the photometric behaviour reveals consistencies with the simple evolving pseudo-photosphere model of the nova outburst. The optical spectra are also compared to X-ray and radio light curves. Weak [Fe X] 6375A emission was marginally detected before the rise in X-ray emission. The middle of the plateau in the X-ray light curve is coincident with the appearance of high ionization species detected in optical spectra and the peak of the high frequency radio flux.
|Item Type:||Conference or Workshop Item (Paper)|
|Uncontrolled Keywords:||astro-ph.SR; astro-ph.SR|
|Subjects:||Q Science > QB Astronomy|
|Divisions:||Astrophysics Research Institute|
|Publisher:||Astronomical Society of the Pacific|
|Date Deposited:||17 Dec 2015 13:09|
|Last Modified:||17 Dec 2015 13:09|
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