TY - JOUR
T1 - The double-degenerate nucleus of the planetary nebula TS 01: a close binary evolution showcase
AU - Tovmassian, G.
AU - Yungelson, L.
AU - Rauch, T.
AU - Suleimanov, V.
AU - Napiwotzki, R.
AU - Stasinska, G.
AU - Tomsick, J.
AU - Wilms, J.
AU - Morisset, C.
AU - Pena, M.
AU - Richer, M.G.
N1 - Original article can be found at: http://iopscience.iop.org/0004-637X/ Copyright American Astronomical Society. [Full text of this article is not available in the UHRA]
PY - 2010
Y1 - 2010
N2 - We present a detailed investigation of SBS 1150+599A, a close binary star hosted by the planetary nebula PN G135.9+55.9 (TS 01). The nebula, located in the Galactic halo, is the most oxygen-poor known to date and is the only one known to harbor a double degenerate core. We present XMM-Newton observations of this object, which allowed the detection of the previously invisible component of the binary core, whose existence was inferred so far only from radial velocity (RV) and photometric variations. The parameters of the binary system were deduced from a wealth of information via three independent routes using the spectral energy distribution (from the infrared to X-rays), the light and RV curves, and a detailed model atmosphere fitting of the stellar absorption features of the optical/UV component. We find that the cool component must have a mass of 0.54 ± 0.2 M , an average effective temperature, T eff, of 58,000 ± 3000 K, a mean radius of 0.43 ± 0.3 R , a gravity, log g = 5.0 ± 0.3, and that it nearly fills its Roche lobe. Its surface elemental abundances are found to be: 12 + log He/H = 10.95 ± 0.04 dex, 12 + log C/H = 7.20 ± 0.3 dex, 12 + log N/H < 6.92, and 12 + log O/H < 6.80, in overall agreement with the chemical composition of the planetary nebula. The hot component has T eff = 160-180 kK, a luminosity of about ~104 L and a radius slightly larger than that of a white dwarf. It is probably bloated and heated as a result of intense accretion and nuclear burning on its surface in the past. The total mass of the binary system is very close to the Chandrasekhar limit. This makes TS 01 one of the best Type Ia supernova progenitor candidates. We propose two possible scenarios for the evolution of the system up to its present stage.
AB - We present a detailed investigation of SBS 1150+599A, a close binary star hosted by the planetary nebula PN G135.9+55.9 (TS 01). The nebula, located in the Galactic halo, is the most oxygen-poor known to date and is the only one known to harbor a double degenerate core. We present XMM-Newton observations of this object, which allowed the detection of the previously invisible component of the binary core, whose existence was inferred so far only from radial velocity (RV) and photometric variations. The parameters of the binary system were deduced from a wealth of information via three independent routes using the spectral energy distribution (from the infrared to X-rays), the light and RV curves, and a detailed model atmosphere fitting of the stellar absorption features of the optical/UV component. We find that the cool component must have a mass of 0.54 ± 0.2 M , an average effective temperature, T eff, of 58,000 ± 3000 K, a mean radius of 0.43 ± 0.3 R , a gravity, log g = 5.0 ± 0.3, and that it nearly fills its Roche lobe. Its surface elemental abundances are found to be: 12 + log He/H = 10.95 ± 0.04 dex, 12 + log C/H = 7.20 ± 0.3 dex, 12 + log N/H < 6.92, and 12 + log O/H < 6.80, in overall agreement with the chemical composition of the planetary nebula. The hot component has T eff = 160-180 kK, a luminosity of about ~104 L and a radius slightly larger than that of a white dwarf. It is probably bloated and heated as a result of intense accretion and nuclear burning on its surface in the past. The total mass of the binary system is very close to the Chandrasekhar limit. This makes TS 01 one of the best Type Ia supernova progenitor candidates. We propose two possible scenarios for the evolution of the system up to its present stage.
U2 - 10.1088/0004-637x/714/1/178
DO - 10.1088/0004-637x/714/1/178
M3 - Article
SN - 0004-637X
VL - 714
SP - 178
EP - 193
JO - The Astrophysical Journal
JF - The Astrophysical Journal
IS - 1
ER -