The extraordinary X-ray light curve of the classical nova V1494 aquilae (1999 no. 2) in outburst

The discovery of pulsations and a "burst"

Jeremy J. Drake, R. Mark Wagner, Sumner Starrfield, Yousaf Butt, Joachim Krautter, Howard E. Bond, M. B. Della Valle, R. D. Gehrz, Charles E. Woodward, A. Evans, M. Orio, P. Hauschildt, M. Hernanz, K. Mukai, J. W. Truran

Research output: Contribution to journalReview article

59 Citations (Scopus)

Abstract

V1494 Aql (Nova Aql 1999 No. 2) was discovered on 1999 December 2. We obtained Chandra ACIS-I spectra on 2000 April 15 and June 7 which appear to show only emission lines. Our third observation, on August 6, showed that its spectrum had evolved to that characteristic of a Super Soft X-ray Source. We then obtained Chandra LETG+HRC-S spectra on September 28 (8 ks) and October 1 (17 ks). We analyzed the X-ray light curve of our grating observations and found both a short timescale "burst" and oscillations. Neither of these phenomena has previously been seen in the light curve of a nova in outburst. The "burst" was a factor of ∼10 rise in X-ray counts near the middle of the second observation, and which lasted about 1000 s; it exhibited at least two peaks, in addition to other structure. Our time series analysis of the combined 25 ks observation shows a peak at ∼2500 s which is present in independent analyses of both the zeroth-order image and the dispersed spectrum and is not present in similar analyses of grating data for HZ 43 and Sirius B. Further analyses of the V1494 Aql data find other periods present which implies that we are observing nonradial g+ modes from the pulsating, rekindled white dwarf.

Original languageEnglish (US)
Pages (from-to)448-452
Number of pages5
JournalAstrophysical Journal
Volume584
Issue number1 I
DOIs
StatePublished - Feb 10 2003

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outburst
light curve
bursts
x rays
gratings
time series analysis
oscillation
timescale
oscillations

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Drake, Jeremy J. ; Mark Wagner, R. ; Starrfield, Sumner ; Butt, Yousaf ; Krautter, Joachim ; Bond, Howard E. ; Della Valle, M. B. ; Gehrz, R. D. ; Woodward, Charles E. ; Evans, A. ; Orio, M. ; Hauschildt, P. ; Hernanz, M. ; Mukai, K. ; Truran, J. W. / The extraordinary X-ray light curve of the classical nova V1494 aquilae (1999 no. 2) in outburst : The discovery of pulsations and a "burst". In: Astrophysical Journal. 2003 ; Vol. 584, No. 1 I. pp. 448-452.
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title = "The extraordinary X-ray light curve of the classical nova V1494 aquilae (1999 no. 2) in outburst: The discovery of pulsations and a {"}burst{"}",
abstract = "V1494 Aql (Nova Aql 1999 No. 2) was discovered on 1999 December 2. We obtained Chandra ACIS-I spectra on 2000 April 15 and June 7 which appear to show only emission lines. Our third observation, on August 6, showed that its spectrum had evolved to that characteristic of a Super Soft X-ray Source. We then obtained Chandra LETG+HRC-S spectra on September 28 (8 ks) and October 1 (17 ks). We analyzed the X-ray light curve of our grating observations and found both a short timescale {"}burst{"} and oscillations. Neither of these phenomena has previously been seen in the light curve of a nova in outburst. The {"}burst{"} was a factor of ∼10 rise in X-ray counts near the middle of the second observation, and which lasted about 1000 s; it exhibited at least two peaks, in addition to other structure. Our time series analysis of the combined 25 ks observation shows a peak at ∼2500 s which is present in independent analyses of both the zeroth-order image and the dispersed spectrum and is not present in similar analyses of grating data for HZ 43 and Sirius B. Further analyses of the V1494 Aql data find other periods present which implies that we are observing nonradial g+ modes from the pulsating, rekindled white dwarf.",
author = "Drake, {Jeremy J.} and {Mark Wagner}, R. and Sumner Starrfield and Yousaf Butt and Joachim Krautter and Bond, {Howard E.} and {Della Valle}, {M. B.} and Gehrz, {R. D.} and Woodward, {Charles E.} and A. Evans and M. Orio and P. Hauschildt and M. Hernanz and K. Mukai and Truran, {J. W.}",
year = "2003",
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doi = "10.1086/345534",
language = "English (US)",
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Drake, JJ, Mark Wagner, R, Starrfield, S, Butt, Y, Krautter, J, Bond, HE, Della Valle, MB, Gehrz, RD, Woodward, CE, Evans, A, Orio, M, Hauschildt, P, Hernanz, M, Mukai, K & Truran, JW 2003, 'The extraordinary X-ray light curve of the classical nova V1494 aquilae (1999 no. 2) in outburst: The discovery of pulsations and a "burst"', Astrophysical Journal, vol. 584, no. 1 I, pp. 448-452. https://doi.org/10.1086/345534

The extraordinary X-ray light curve of the classical nova V1494 aquilae (1999 no. 2) in outburst : The discovery of pulsations and a "burst". / Drake, Jeremy J.; Mark Wagner, R.; Starrfield, Sumner; Butt, Yousaf; Krautter, Joachim; Bond, Howard E.; Della Valle, M. B.; Gehrz, R. D.; Woodward, Charles E.; Evans, A.; Orio, M.; Hauschildt, P.; Hernanz, M.; Mukai, K.; Truran, J. W.

In: Astrophysical Journal, Vol. 584, No. 1 I, 10.02.2003, p. 448-452.

Research output: Contribution to journalReview article

TY - JOUR

T1 - The extraordinary X-ray light curve of the classical nova V1494 aquilae (1999 no. 2) in outburst

T2 - The discovery of pulsations and a "burst"

AU - Drake, Jeremy J.

AU - Mark Wagner, R.

AU - Starrfield, Sumner

AU - Butt, Yousaf

AU - Krautter, Joachim

AU - Bond, Howard E.

AU - Della Valle, M. B.

AU - Gehrz, R. D.

AU - Woodward, Charles E.

AU - Evans, A.

AU - Orio, M.

AU - Hauschildt, P.

AU - Hernanz, M.

AU - Mukai, K.

AU - Truran, J. W.

PY - 2003/2/10

Y1 - 2003/2/10

N2 - V1494 Aql (Nova Aql 1999 No. 2) was discovered on 1999 December 2. We obtained Chandra ACIS-I spectra on 2000 April 15 and June 7 which appear to show only emission lines. Our third observation, on August 6, showed that its spectrum had evolved to that characteristic of a Super Soft X-ray Source. We then obtained Chandra LETG+HRC-S spectra on September 28 (8 ks) and October 1 (17 ks). We analyzed the X-ray light curve of our grating observations and found both a short timescale "burst" and oscillations. Neither of these phenomena has previously been seen in the light curve of a nova in outburst. The "burst" was a factor of ∼10 rise in X-ray counts near the middle of the second observation, and which lasted about 1000 s; it exhibited at least two peaks, in addition to other structure. Our time series analysis of the combined 25 ks observation shows a peak at ∼2500 s which is present in independent analyses of both the zeroth-order image and the dispersed spectrum and is not present in similar analyses of grating data for HZ 43 and Sirius B. Further analyses of the V1494 Aql data find other periods present which implies that we are observing nonradial g+ modes from the pulsating, rekindled white dwarf.

AB - V1494 Aql (Nova Aql 1999 No. 2) was discovered on 1999 December 2. We obtained Chandra ACIS-I spectra on 2000 April 15 and June 7 which appear to show only emission lines. Our third observation, on August 6, showed that its spectrum had evolved to that characteristic of a Super Soft X-ray Source. We then obtained Chandra LETG+HRC-S spectra on September 28 (8 ks) and October 1 (17 ks). We analyzed the X-ray light curve of our grating observations and found both a short timescale "burst" and oscillations. Neither of these phenomena has previously been seen in the light curve of a nova in outburst. The "burst" was a factor of ∼10 rise in X-ray counts near the middle of the second observation, and which lasted about 1000 s; it exhibited at least two peaks, in addition to other structure. Our time series analysis of the combined 25 ks observation shows a peak at ∼2500 s which is present in independent analyses of both the zeroth-order image and the dispersed spectrum and is not present in similar analyses of grating data for HZ 43 and Sirius B. Further analyses of the V1494 Aql data find other periods present which implies that we are observing nonradial g+ modes from the pulsating, rekindled white dwarf.

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U2 - 10.1086/345534

DO - 10.1086/345534

M3 - Review article

VL - 584

SP - 448

EP - 452

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 I

ER -