Hubble space telescope far ultraviolet spectroscopy of the recurrent nova t pyxidis

Patrick Godon, Edward M. Sion, Sumner Starrfield, Mario Livio, Robert E. Williams, Charles E. Woodward, Paul Kuin, Kim L. Page

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

With six recorded nova outbursts, the prototypical recurrent nova T Pyxidis (T Pyx) is the ideal cataclysmic variable system to assess the net change of the white dwarf mass within a nova cycle. Recent estimates of the mass ejected in the 2011 outburst ranged from a few ∼10-5 M to 3.3 × 10-4 M, and assuming a mass accretion rate of 10-8-10 -7 M yr-1 for 44 yr, it has been concluded that the white dwarf in T Pyx is actually losing mass. Using NLTE disk modeling spectra to fit our recently obtained Hubble Space Telescope COS and STIS spectra, we find a mass accretion rate of up to two orders of magnitude larger than previously estimated. Our larger mass accretion rate is due mainly to the newly derived distance of T Pyx (4.8 kpc, larger than the previous 3.5 kpc estimate), our derived reddening of E(B-V) = 0.35 (based on combined IUE and GALEX spectra), and NLTE disk modeling (compared to blackbody and raw flux estimates in earlier works). We find that for most values of the reddening (0.25 ≤ E(B-V) ≤ 0.50) and white dwarf mass (0.70 M · ≤ M wd ≤ 1.35 M ·) the accreted mass is larger than the ejected mass. Only for a low reddening (∼0.25 and smaller) combined with a large white dwarf mass (0.9 M and larger) is the ejected mass larger than the accreted one. However, the best results are obtained for a larger value of reddening.

Original languageEnglish (US)
Article numberL33
JournalAstrophysical Journal Letters
Volume784
Issue number2
DOIs
StatePublished - Apr 1 2014

Fingerprint

ultraviolet spectroscopy
Hubble Space Telescope
spectroscopy
accretion
outburst
estimates
IUE
cataclysmic variables
modeling
cycles

Keywords

  • accretion accretion disks
  • binaries: close
  • novae cataclysmic variables
  • stars: individual (T Pyxidis)
  • ultraviolet: stars
  • white dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Hubble space telescope far ultraviolet spectroscopy of the recurrent nova t pyxidis. / Godon, Patrick; Sion, Edward M.; Starrfield, Sumner; Livio, Mario; Williams, Robert E.; Woodward, Charles E.; Kuin, Paul; Page, Kim L.

In: Astrophysical Journal Letters, Vol. 784, No. 2, L33, 01.04.2014.

Research output: Contribution to journalArticle

Godon, Patrick ; Sion, Edward M. ; Starrfield, Sumner ; Livio, Mario ; Williams, Robert E. ; Woodward, Charles E. ; Kuin, Paul ; Page, Kim L. / Hubble space telescope far ultraviolet spectroscopy of the recurrent nova t pyxidis. In: Astrophysical Journal Letters. 2014 ; Vol. 784, No. 2.
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