X-ray observations of classical novae. Theoretical implications (2009)
Detection of X-rays from classical novae, both in outburst and post-outburst, provides unique and crucial information about the explosion mechanism. Soft X-rays reveal the hot white dwarf...
Pre-nova X-ray observations of V2491 Cyg (Nova Cyg 2008b) (2009)
Ibarra, A., Kuulkers, E., Osborne, J. P., Page, K., Ness, J. U., Saxton, R. D., ...
Classical novae are phenomena caused by explosive hydrogen burning on an accreting white dwarf. So far, only one classical nova has been identified in X-rays before the actual optical outburst...
The very short supersoft X-ray state of the classical nova M31N 2007-11a (2009)
Henze, M., Pietsch, W., Sala, G., Della Valle, H., Hernanz, M., Greiner, J., ...
Henze, M., Pietsch, W., Haberl, F., Sala, G., Quimby, R., Hernanz, M., ...
The very short supersoft X-ray state of the classical nova M31N 2007-11a (2008)
Henze, M., Pietsch, W., Sala, G., Della Valle, M., Hernanz, M., Greiner, J., ...
Short supersoft X-ray source (SSS) states (durations < 100 days) of classical novae (CNe) indicate massive white dwarfs which are candidates for the progenitors of supernovae type Ia. We carry out a...
Henze, M., Pietsch, W., Haberl, F., Sala, G., Quimby, R., Hernanz, M., ...
Optical novae have been found to represent the major class of supersoft X-ray sources (SSS) in our neighbour galaxy M 31. We present the two first SSSs ever discovered in the M 31 globular cluster...
Thermonuclear (type Ia) supernovae are explosions in accreting white dwarfs, but the exact scenario leading to these explosions is still unclear. An important step to clarify this point is to...
The recurrent nova RS Oph: A possible scenario for type Ia supernovae (2008)
The recurrent nova RS Oph experienced an outburst in 2006, 21 years after its previous explosion in 1985, as expected. It was observed at almost all wavelengths, and important information about its...
Detectability of gamma-ray emission from classical novae with Swift/BAT (2008)
Senziani, F., Skinner, G. K., Jean, P., Hernanz, M.
Classical novae are expected to emit gamma rays during their explosions. The most important contribution to the early gamma-ray emission comes from the annihilation with electrons of the positrons...
Spectroscopic observations of the 2006 outburst of RS Oph at both infrared (IR) and X-ray wavelengths have shown that the blast wave has decelerated at a higher rate than predicted by the standard...
A deep XMM-Newton survey of M 31 (2008)
Stiele, H., Pietsch, W., Haberl, F., Barnard, R., Burwitz, V., Freyberg, M., ...
Monte Carlo Simulations Of The White Dwarf Population And Luminosity Function (2007)
Matt A. Wood, J. Isern, M. Hernanz
. The white dwarf luminosity function has been used in recent years as an independent probe of the age and evolution of the local Galactic disk. A long-standing uncertainty of the technique is that...
Spectroscopic observations of the 2006 outburst of the recurrent nova RS Ophiuchi at both infrared (IR) and X-ray wavelengths have shown that the blast wave has decelerated at a higher rate than...
XMM-Newton observations of Nova Sgr 1998 (2007)
We report on X-ray observations of Nova Sagittarius 1998 (V4633 Sgr), performed with XMM-Newton at three different epochs, 934, 1083 and 1265 days after discovery. The nova was detected with the EPIC...
Nucleosynthesis in classical novae (2007)
Hernanz, M., Jose, J., Coc, A.
A general review of the relevance of classical novae for the chemical evolution of the Galaxy, as well as for Galactic radioactivity is presented. A special emphasis is put on the pioneering work...
Chafa, A., Tatischeff, V., Aguer, P., Barhoumi, S., Coc, A., Garrido, F., ...
The $^{17}O(p,\alpha)^{14}N$ and $^{17}O(p,\gamma)^{18}F$ reactions are of major importance to hydrogen-burning nucleosynthesis in a number of different stellar sites. In particular, $^{17}O$ and...
Chafa, A., Tatischeff, V., Aguer, P., Barhoumi, S., Coc, A., Garrido, F., ...
The $^{17}O(p,\alpha)^{14}N$ and $^{17}O(p,\gamma)^{18}F$ reactions are of major importance to hydrogen-burning nucleosynthesis in a number of different stellar sites. In particular, $^{17}O$ and...
Chafa, A., Tatischeff, V., Aguer, P., Barhoumi, S., Coc, A., Garrido, F., ...
The $^{17}O(p,\alpha)^{14}N$ and $^{17}O(p,\gamma)^{18}F$ reactions are of major importance to hydrogen-burning nucleosynthesis in a number of different stellar sites. In particular, $^{17}O$ and...
Influence of new reaction rates on $^{18}$F production in novae (2006)
Coc, A., Hernanz, M., Jose, J., Thibaud, J.P.
Gamma-ray emission from classical novae is dominated, during the first hours, by positron annihilation resulting from the beta decay of radioactive nuclei. The main contribution comes from the decay...
MAX: Development of a Laue diffraction lens for nuclear astrophysics (2006)
Barriere, N., Von Ballmoos, P., Skinner, G., Smither, B., Bastie, P., Hinglais, E., ...
The next generation of instrumentation for nuclear astrophysics will have to achieve an improvement in sensitivity by a factor of 10100 over present technologies. With the focusing gamma-ray...
MAX: Development of a Laue diffraction lens for nuclear astrophysics (2006)
Barriere, N., Von Ballmoos, P., Skinner, G., Smither, B., Bastie, P., Hinglais, E., ...
The next generation of instrumentation for nuclear astrophysics will have to achieve an improvement in sensitivity by a factor of 10100 over present technologies. With the focusing gamma-ray...
MAX: Development of a Laue diffraction lens for nuclear astrophysics (2006)
Barriere, N., Von Ballmoos, P., Skinner, G., Smither, B., Bastie, P., Hinglais, E., ...
The next generation of instrumentation for nuclear astrophysics will have to achieve an improvement in sensitivity by a factor of 10100 over present technologies. With the focusing gamma-ray...
Hydrogen Burning of $^{17}$O in Classical Novae (2005)
Chafa, A., Tatischeff, V., Aguer, P., Barhoumi, S., Coc, A., Garrido, F., ...
We report on the observation of a previously unknown resonance at E=194.1+/-0.6 keV (lab) in the 17-O(p,alpha)14-N reaction, with a measured resonance strength omega_gamma(p,alpha)=1.6+/-0.2 meV. We...
WSO/UV: World Space Observatory/Ultraviolet (2005)
Hernanz, M., Gonzalez-Riestra, R., Wamsteker, W., Shustov, B., Barstow, M., Brosch, N., ...
We summarize the capabilities of the World Space Observatory (UV) Project (WSO/UV). An example of the importance of this project (with a planned launch date of 2007/8) for the study of Classical...
Hydrogen Burning of 17-O in Classical Novae (2005)
Chafa, A., Tatischeff, V., Aguer, P., Barhoumi, S., Coc, A., Garrido, F., ...
We report on the observation of a previously unknown resonance at E=194.1+/-0.6 keV (lab) in the 17-O(p,alpha)14-N reaction, with a measured resonance strength omega_gamma(p,alpha)=1.6+/-0.2 meV. We...
Hydrogen Burning of $^{17}$O in Classical Novae (2005)
Chafa, A., Tatischeff, V., Aguer, P., Barhoumi, S., Coc, A., Garrido, F., ...
We report on the observation of a previously unknown resonance at E=194.1+/-0.6 keV (lab) in the 17-O(p,alpha)14-N reaction, with a measured resonance strength omega_gamma(p,alpha)=1.6+/-0.2 meV. We...
Hydrogen Burning of $^{17}$O in Classical Novae (2005)
Chafa, A., Tatischeff, V., Aguer, P., Barhoumi, S., Coc, A., Garrido, F., ...
We report on the observation of a previously unknown resonance at E=194.1+/-0.6 keV (lab) in the 17-O(p,alpha)14-N reaction, with a measured resonance strength omega_gamma(p,alpha)=1.6+/-0.2 meV. We...
Search for a galactic 1275 keV line emission with SPI/INTEGRAL (2004)
Jean, P., Knödlseder, J., Hernanz, M., Cisana, E., Valsesia, M., Kienlin, A. Von, ...
Proton-decaying states in 22Mg and the nucleosynthesis of 22Na in novae (2003)
Davids, B., Beijers, J. P. M., Dendooven, P., Harmsma, S., Hunyadi, M., ...
Populating states in 22Mg via the (p,t) reaction in inverse kinematics with a 55 MeV/nucleon 24Mg beam, we have measured the proton-decay branching ratios of the levels at 5.96 MeV and 6.05 MeV and...
Starrfield, S., Burwitz, V., Hauschildt, P., Wichmann, R., Drake, J. J., ...
V4743 Sgr (Nova Sgr 2002 No. 3) was discovered on 20 September 2002. We obtained a 5ks ACIS-S spectrum in November 2002 and found that the nova was faint in X-rays. We then obtained a 25ks CHANDRA...
The frequency of occurrence of novae hosting an ONe white dwarf (2003)
Gil-Pons, P., Garcia-Berro, E., Jose, J., Hernanz, M., Truran, J. W.
In this paper, we revisit the problem of the determination of the frequency of occurrence of galactic nova outbursts which involve an oxygen-neon (ONe) white dwarf. The improvement with respect to...
The astrophysical rate of 15O(alpha,gamma)19Ne via the (p,t) reaction in inverse kinematics (2003)
Davids, B., Dendooven, P., Fleurot, F., Hernanz, M., Hunyadi, M., ...
A recoil coincidence technique has been applied to measure the alpha-decay branching ratios of near-threshold states in 19Ne. Populating these states using the (p,t) reaction in inverse kinematics,...
The 21Na(p,gamma)22Mg Reaction and Oxygen-Neon Novae (2003)
Bishop, S., Azuma, R. E., Buchmann, L., Chen, A. A., Chatterjee, M. L., D'Auria, J. M., ...
The 21Na(p,gamma)22Mg reaction is expected to play an important role in the nucleosynthesis of 22Na in Oxygen-Neon novae. The decay of 22Na leads to the emission of a characteristic 1.275 MeV...
Drake, Jeremy J., Wagner, R. Mark, Starrfield, Sumner, Butt, Yousaf, Krautter, Joachim, Bond, H. E., ...
V1494 Aql (Nova Aql 1999 No. 2) was discovered on 2 December 1999. We obtained Chandra ACIS-I spectra on 15 April and 7 June 2000 which appear to show only emission lines. Our third observation, on 6...
WSO/UV: World Space Observatory/Ultraviolet (2002)
Hernanz, M., Gonzalez-Riestra, R., Wamsteker, W., Shustov, B., Barstow, M., Brosch, N., ...
We summarize the capabilities of the World Space Observatory (UV) Project (WSO/UV). An example of the importance of this project (with a planned launch date of 2007/8) for the study of Classical...
WSO/UV: World Space Observatory/Ultraviolet (2002)
Hernanz, M., Gonzalez-Riestra, R., Wamsteker, W., Shustov, B., Barstow, M., Brosch, N., ...
We summarize the capabilities of the World Space Observatory (UV) Project (WSO/UV). An example of the importance of this project (with a planned launch date of 2007/8) for the study of Classical...
Future INTEGRAL observations of classical novae (2002)
Hernanz, M., Jean, P., Jose, J., Coc, A., Starrfield, S., Truran, J., ...
Future INTEGRAL observations of classical novae (2002)
Hernanz, M., Jean, P., Jose, J., Coc, A., Starrfield, S., Truran, J., ...
WSO/UV: World Space Observatory/Ultraviolet (2002)
Hernanz, M., Gonzalez-Riestra, R., Wamsteker, W., Shustov, B., Barstow, M., Brosch, N., ...
We summarize the capabilities of the World Space Observatory (UV) Project (WSO/UV). An example of the importance of this project (with a planned launch date of 2007/8) for the study of Classical...
The prompt gamma-ray emission of novae (2001)
Hernanz, M., Gomez-Gomar, J., Jose, J.
Classical novae are potential gamma-ray emitters, because of the disintegration of some radioactive nuclei synthesized during the explosion. Some short-lived isotopes (such as 13N and 18F), as well...
Gamma-ray signatures of classical novae (2001)
Hernanz, M., Gomez-Gomar, J., Jose, J.
The role of classical novae as potential gamma-ray emitters is reviewed, on the basis of theoretical models of the gamma-ray emission from different nova types. The interpretation of the up to now...
Upper limits of the $^{22}$Na yield from O-Ne nova (2001)
Jean, P., Knödlseder, J., Von Ballmoos, P., Gómez-Gomar, J., Hernanz, M., José, J.
The radioactive isotope $^{22}$Na is one of the primary tracer isotopes that may potentially be detectable by gamma-ray spectroscopy. This isotope is predicted to be produced in ONe nova explosions,...
Explosive nucleosynthesis (2001)
Many radioactive nuclei relevant for gamma-ray astrophysics are synthesized during explosive events, such as classical novae and supernovae. A review of recent results of explosive nucleosynthesis in...
Prospects for detectability of classical novae with INTEGRAL (2001)
Hernanz, M., Gomez-Gomar, J., Jose, J., Coc, A.
Classical novae are potential gamma-ray emitters, both in lines and in a continuum. Continuum emission (at energies between 20-30 and 511 keV) and line emission at 511 keV are related to positron...
Nucleosynthesis in classical novae (2001)
Hernanz, M., Jose, J., Coc, A.
A general review of the relevance of classical novae for the chemical evolution of the Galaxy, as well as for Galactic radioactivity is presented. A special emphasis is put on the pioneering work...
Conflictos y dilemas éticos en la atención psiquiátrica (2001)
El debate ético sobre la corrección y la bondad de las prácticas psiquiátricas se ha enriquecido y sistematizado con las aportaciones provenientes de la bioética. Se enuncian algunos conceptos...
Presolar Grains from Novae (2000)
Amari, S., Gao, X., Nittler, L. N., Zinner, E., Jose, J., Hernanz, M., ...
We report the discovery of five SiC grains and one graphite grain isolated from the Murchison carbonaceous meteorite whose major-element isotopic compositions indicate an origin in nova explosions....
The ages of very cool hydrogen-rich white dwarfs (2000)
Salaris, M., Garcia-Berro, E., Hernanz, M., Isern, J., Saumon, D.
The evolution of white dwarfs is essentially a cooling process that depends primarily on the energy stored in their degenerate cores and on the transparency of their envelopes. In this paper we...
Galactic 1.275 MeV emission from ONe novae and its detectability by INTEGRAL/SPI (2000)
Jean, P., Hernanz, M., Gomez-Gomar, J., Jose, J.
Models of Galactic 1.275 MeV emission produced by the decay of the radionuclide $^{22}$Na have been computed. Several frequency-spatial distributions of novae have been investigated using recent...
Hernanz, M., Jose, J., Coc, A., Gomez-Gomar, J., Isern, J.
Classical novae emit gamma-ray radiation at 511 keV and below, with a cut-off at around (20-30) keV, related to positron annihilation and its Comptonization in the expanding envelope. This emission...
The energetics of crystallizing white dwarfs revisited again (1999)
Isern, J., Garcia-Berro, E., Hernanz, M., Chabrier, G.
The evolution of white dwarfs is a cooling process that depends on the energy stored in the core and on the way in which it is transferred through the envelope. In this paper we show that despite...
Galactic distribution of 1.275 MeV emission from O-Ne novae (1999)
Jean, P., Hernanz, M., Gomez-Gomar, J., Jose, J.
Modelisations of galactic 1.275 MeV emission produced by the decay 22Na have been performed for several frequency-spatial distributions of ONe novae. Recent results of nova rates and their...
Jean, P., Gomez-Gomar, J., Hernanz, M., Jose, J., Isern, J., Vedrenne, G., ...
The shield of the INTEGRAL spectrometer provides a large detection area with a wide field-of-view. Calculations have been performed to check whether the temporal analysis of the counting rate of the...
Gamma-ray emission of classical novae and its detectability by INTEGRAL (1998)
Hernanz, M., Gomez-Gomar, J., Jose, J., Coc, A., Isern, J.
A lot of information concerning the mechanism of nova explosions will be extracted from the possible future observations with INTEGRAL. In order to be prepared for this task, we are performing...
The halo white dwarf population (1998)
Isern, J., Garcia-Berro, E., Hernanz, M., Mochkovitch, R., Torres, S.
Halo white dwarfs can provide important information about the properties and evolution of the galactic halo. In this paper we compute, assuming a standard IMF and updated models of white dwarf...
Gamma--ray emission from individual classical novae (1997)
Gómez-Gomar, J., Hernanz, M., José, J., Isern, J.
Classical novae are important producers of radioactive nuclei, such as be7, n13, f18, na22 and al26. The disintegration of these nuclei produces positrons (except for be7) that through annihilation...
Predictions of gamma-ray emission from classical novae and their detectability by CGRO (1997)
Hernanz, M., Gomez-Gomar, J., Jose, J., Isern, J.
An implicit hydrodynamic code following the explosion of classical novae, from the accretion phase up to the final ejection of the envelope, has been coupled to a MonteCarlo code able to simulate...
The cooling of CO white dwarfs: influence of the internal chemical distribution (1997)
Salaris, M., Dominguez, I., Garcia-Berro, E., Hernanz, M., Isern, J., Mochkovitch, R.
In this paper we compute detailed evolutionary models providing chemical profiles for white dwarfs having progenitors in the mass range from 1.0 to $7 M_{\sun}$ and we examine the influence of such...
Nucleosynthesis in novae: production of $^{26}$Al, $^{22}$Na and $^7$Be (1997)
Coc, A., Hernanz, M., Isern, J., Jose, J., Mochkovitch, R., Oberto, Y., ...
Nucleosynthesis in novae: production of $^{26}$Al, $^{22}$Na and $^7$Be (1997)
Coc, A., Hernanz, M., Isern, J., Jose, J., Mochkovitch, R., Oberto, Y., ...
On the ^7 Li and ^7 Be synthesis in novae (1996)
Hernanz, M., Jose, J., Coc, A., Isern, J.
The production of ^7 Li and ^7 Be during the explosive hydrogen-burning that occurs in nova explosions is computed by means of a hydrodynamic code able to treat both the accretion and the explosion...