J/ApJ/886/L14 Gemini/FLAMINGOS-2 NIR spectra of V1047 Cen (Geballe+, 2019)
Infrared spectroscopy of the recent outburst in V1047 Cen (Nova Centauri 2005).
Geballe T.R., Banerjee D.P.K., Evans A., Gehrz R.D., Woodward C.E., Mroz P.,
Udalski A., Munari U., Starrfield S., Page K.L., Sokolovsky K.,
Hambsch F.-J., Myers G., Aydi E., Buckley D.A.H., Walter F., Wagner R.M.
<Astrophys. J. , 886, L14 (2019)>
=2019ApJ...886L..14G 2019ApJ...886L..14G
ADC_Keywords: Novae; Spectra, infrared
Keywords: Cataclysmic variable stars ; Infrared sources
Abstract:
Fourteen years after its eruption as a classical nova (CN), V1047 Cen
(Nova Cen 2005) began an unusual re-brightening in 2019 April. The
amplitude of the brightening suggests that this is a dwarf nova (DN)
eruption in a CN system. Very few CNe have had DN eruptions within
decades of the main CN outburst. The 14yr separating the CN and DN
eruptions of V1047 Cen is the shortest of all instances recorded thus
far. Explaining this rapid succession of CN and DN outbursts in
V1047 Cen may be challenging within the framework of standard theories
for DN outbursts. Following a CN eruption, the mass accretion rate is
believed to remain high (dM/dt∼10-8M☉/yr) for a few centuries,
due to the irradiation of the secondary star by the still-hot surface
of the white dwarf. Thus a DN eruption is not expected to occur during
this high mass accretion phase as DN outbursts, which result from
thermal instabilities in the accretion disk, and arise during a regime
of low mass accretion rate (dM/dt∼10-10M☉/yr). Here we present
near-infrared spectroscopy to show that the present outburst is most
likely a DN eruption, and discuss the possible reasons for its early
occurrence. Even if the present re-brightening is later shown to be
due to a cause other than a DN outburst, the present study provides
invaluable documentation of this unusual event.
Description:
Spectra of V1047 Cen were obtained at the 8.1m Gemini South Telescope
using its facility spectrograph FLAMINGOS-2 on 2019 Jun 30/Jul 1 and
2019 Aug 1/2 in the wavelength range 0.9-1.8um (JH grism; R∼200 to
∼1100 at 1.3-1.4um) and 1.9-2.5um with the R3K grism (R∼1200 to 3200
near 2.2um).
Objects:
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RA (ICRS) DE Designation(s)
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13 20 49.74 -62 37 50.5 NOVA Cen 2005 = V* V1047 Cen
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig2.dat 28 6411 The 0.9-2.5 micron spectra of V1047 Cen obtained
on 2019 June 30/July 1 and 2019 August 1/2
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
B/gemini : The Gemini Observation Log (CADC, 2001-)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
J/A+A/453/635 : Modelling Galactic Interstellar Extinction (Marshall+, 2006)
J/AJ/141/121 : V446 Her V light curves (Honeycutt+, 2011)
J/ApJS/197/31 : Swift X-ray obs. of classical novae. II. (Schwarz+, 2011)
J/A+A/554/A123 : Near-IR catalog of novae in VVV survey area (Saito+, 2013)
J/MNRAS/440/2036 : VPHAS+ survey synthetic colours (Drew+, 2014)
J/ApJ/788/164 : Known Galactic classical novae (Pagnotta+, 2014)
J/MNRAS/465/3011 : VVV high amplitude NIR var. stars (Contreras Pena+, 2017)
J/A+A/647/A169 : VVV survey near-infrared colour catalog (Herpich+, 2021)
Byte-by-byte Description of file: fig2.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Date Date code (1)
4 A1 --- Band [JK] Band corresponding to spectral coverage (2)
6- 14 F9.7 um lambda [0.89/2.51] Wavelength
16- 28 E13.7 W/m2/um Flux [1.36e-14/6.76e-13] Observed flux
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Note (1): Code as follows:
D1 = July 1st, 2019
UTC JD 2458665.50278 at mid-exposure for the J region and
UTC JD 2458665.48125 at mid-exposure for the K region.
D2 = August 2nd, 2019
UTC JD 2458697.53958 at mid-exposure for the J region and
UTC JD 2458697.51806 at mid-exposure for the K region.
Note (2): Band as follows:
J = 0.9-1.8um (2648 occurrences)
K = 1.9-2.5um (3763 occurrences)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Apr-2021