Hot subdwarf binaries - Masses and nature of their heavy compact companions (2009)
Geier, Stephan, Heber, Uli, Edelmann, Heinz, Kupfer, Thomas, Napiwotzki, Ralf, Podsiadlowski, Philipp
Neutron stars and stellar-mass black holes are the remnants of massive stars, which ended their lives in supernova explosions. These exotic objects can only be studied in relatively rare cases. If...
On type Ia supernovae and the formation of single low-mass white dwarfs (2008)
Justham, Stephen, Wolf, Christian, Podsiadlowski, Philipp, Han, Zhanwen
There is still considerable debate over the progenitors of type Ia supernovae (SNe Ia). Likewise, it is not agreed how single white dwarfs with masses less than ~0.5 Msun can be formed in the field,...
Bandyopadhyay, Reba M., Gosling, Andrew J., Eikenberry, Stephen E., Muno, Michael P., Blundell, Katherine M., Podsiadlowski, Philipp, ...
I describe the IR and X-ray observational campaign we have undertaken for the purpose of determining the nature of the faint discrete X-ray source population discovered by Chandra in the Galactic...
Hot Subdwarfs in Binaries as the Source of the Far-UV Excess in Elliptical Galaxies (2008)
Podsiadlowski, Philipp, Han, Zhanwen, Lynas-Gray, Anthony E., Brown, David
The excess of far-ultraviolet (far-UV) radiation in elliptical galaxies has remained one of their most enduring puzzles. In contrast, the origin of old blue stars in the Milky Way, hot subdwarfs, is...
Bandyopadhyay, Reba M., Gosling, Andrew J., Eikenberry, Stephen E., Muno, Michael P., Blundell, Katherine M., Podsiadlowski, Philipp, ...
I describe the IR and X-ray observational campaign we have undertaken for the purpose of determining the nature of the faint discrete X-ray source population discovered by Chandra in the Galactic...
Supernova Shock Breakout from a Red Supergiant (2008)
Schawinski, Kevin, Justham, Stephen, Wolf, Christian, Podsiadlowski, Philipp, Sullivan, Mark, Steenbrugge, Katrien C., ...
Massive stars undergo a violent death when the supply of nuclear fuel in their cores is exhausted, resulting in a catastrophic "core-collapse" supernova. Such events are usually only detected at...
Seeking for the progenitors of type Ia supernovae (2008)
Patat, Ferdinando, Chandra, Poonam, Chevalier, Roger, Justham, Stephen, Podsiadlowski, Philipp, Wolf, Christian, ...
The nuclear diversity of type Ia supernova explosions (2008)
Podsiadlowski, Philipp, Mazzali, Paolo, Lesaffre, Pierre, Han, Zhanwen, Förster, Francisco
Supernova shock breakout from a red supergiant (2008)
Schawinski, Kevin, Justham, Stephen, Wolf, Christian, Podsiadlowski, Philipp, Sullivan, Mark, Steenbrugge, Katrien C., ...
Massive stars undergo a violent death when the supply of nuclear fuel in their cores is exhausted, resulting in a catastrophic ``core-collapse'' supernova. Such events are usually only detected at...
Binary Stars as the Source of the Far-UV Excess in Elliptical Galaxies (2007)
Han, Zhanwen, Podsiadlowski, Philipp, Lynas-Gray, Anthony E.
The discovery of an excess of light in the far-ultraviolet (UV) spectrum in elliptical galaxies was a major surprise in 1969. While it is now clear that this UV excess is caused by an old population...
Remnant evolution after a carbon-oxygen white dwarf merger (2007)
Yoon, Sung-Chul, Podsiadlowski, Philipp, Rosswog, Stephan
We systematically explore the evolution of the merger of two carbon-oxygen (CO) white dwarfs. The dynamical evolution of a 0.9 Msun + 0.6 Msun CO white dwarf merger is followed by a three-dimensional...
Constraints on type Ib/c supernovae and gamma-ray burst progenitors (2007)
Fryer, Chris L., Mazzali, Paolo A., Prochaska, Jason, Cappellaro, Enrico, Panaitescu, Alin, Berger, Edo, ...
Determining the nature of the faint X-ray source population near the Galactic Centre (2006)
Bandyopadhyay, Reba M., Gosling, Andrew J., Blundell, Katherine M., Podsiadlowski, Philipp, Eikenberry, Stephen E., Mikles, Valerie J., ...
We present results of a multi-wavelength program to study the faint discrete X-ray source population discovered by Chandra in the Galactic Centre (GC). From IR imaging obtained with the VLT we...
Cosmological Implications of the Second Parameter of Type Ia Supernovae (2006)
Podsiadlowski, Philipp, Mazzali, Paolo A., Lesaffre, Pierre, Wolf, Christian, Forster, Francisco
Theoretical models predict that the initial metallicity of the progenitor of a Type Ia supernova (SN Ia) affects the peak of the supernova light curve. This can cause a deviation from the standard...
The metallicity dependence of the long-duration GRB rate from host galaxy luminosities (2006)
Wolf, Christian, Podsiadlowski, Philipp
We investigate the difference between the host galaxy properties of core-collapse supernovae and long-duration gamma-ray bursts (LGRBs), and quantify a possible metallicity dependence of the...
The (54Fe+58Ni)/56Ni ratio as a second parameter for Type Ia supernova properties (2006)
Mazzali, Paolo A., Podsiadlowski, Philipp
A variation of the relative content of (54Fe+58Ni) versus 56Ni may be responsible for the observed scatter of Type Ia Supernovae (SNe Ia) about a mean relation between their intrinsic brightness and...
A single-degenerate model for the progenitor of the Type Ia supernova 2002ic (2006)
Han, Zhanwen, Podsiadlowski, Philipp
Supernova 2002ic was an atypical Type Ia supernova (SN Ia) with evidence for substantial amounts of hydrogen associated with the system. Contrary to previous claims, we show that its unusual...
Relativistic Binary Pulsars with Black-Hole Companions (2005)
Pfahl, Eric, Podsiadlowski, Philipp, Rappaport, Saul
Binaries containing a stellar-mass black hole and a recycled radio pulsar have so far eluded detection. We present a focused investigation of the formation and evolution of these systems in the...
Stellar Mass Black Hole Binaries as ULXs (2004)
Rappaport, Saul, Podsiadlowski, Philipp, Pfahl, Eric
Ultraluminous X-ray sources (ULXs) with Lx > 10^{39} ergs/s have been discovered in great numbers in external galaxies with ROSAT, Chandra, and XMM. The central question regarding this important...
Binaries with Compact Components: Theoretical and Observational Challenges (2004)
Podsiadlowski, Philipp, Pfahl, Eric, Rappaport, Saul
We report on recent progress in our theoretical understanding of X-ray binaries, which has largely been driven by new observations, and illustrate the interplay between theory and observations...
The single degenerate channel for the progenitors of type Ia supernovae (2003)
Han, Zhanwen, Podsiadlowski, Philipp
We have carried out a detailed study of one of the most popular evolutionary channels for the production of Type Ia supernova (SN Ia) progenitors, the semi-degenerate channel (CO+MS), where a...
On the Evolution and Appearance of a Surviving Companion after a Type Ia Supernova Explosion (2003)
One promising method to test progenitor models for Type Ia supernovae is to identify surviving companion stars in historical supernova remnants. A surviving companion will have been strongly affected...
The origin of sdB stars (II) (2003)
Han, Zhanwen, Podsiadlowski, Philipp, Maxted, Pierre F. L., Marsh, Tom R.
We have carried out a detailed binary populations synthesis (BPS) study of the formation of subdwarf B (sdB) stars and related objects (sdO, sdOB stars) using the latest version of the BPS code...
The Slow Merger of Massive Stars (2002)
Ivanova, Natalia, Podsiadlowski, Philipp
We study the complete merger of two massive stars inside a common envelope and the subsequent evolution of the merger product, a rapidly rotating massive supergiant. Three qualitatively different...
The ruff of equatorial emission around the SS433 jets: its spectral index and origin (2002)
Blundell, Katherine M, Rupen, Michael P, Mioduszewski, Amy J, Muxlow, Tom WB, Podsiadlowski, Philipp
We present unique radio observations of SS433, using MERLIN, the VLBA, and the VLA, which allow us to, for the first time, properly image and derive a meaningful spectral index for the `ruff' of...
On the formation and evolution of black-hole binaries (2002)
Podsiadlowski, Philipp, Rappaport, Saul, Han, Zhanwen
We present the results of a systematic study of the formation and evolution of binaries containing black holes and normal-star companions with a wide range of masses. We first reexamine the standard...
The Origin of Subdwarf B Star (I): the Formation Channels (2002)
Han, Zhanwen, Podsiadlowski, Philipp, Maxted, Pierre L. F., Marsh, Tom R., Ivanova, Natasha
Subdwarf B (sdB) stars (and related sdO/sdOB stars) are believed to be helium core-burning objects with very thin hydrogen-rich envelopes. In recent years it has become increasingly clear from...
Images of an equatorial outflow in SS433 (2001)
Blundell, Katherine, Mioduszewski, Amy, Muxlow, Tom, Podsiadlowski, Philipp, Rupen, Michael
We have imaged the X-ray binary SS433 with unprecedented Fourier-plane coverage at 6cm using simultaneously the VLBA, MERLIN, and the VLA, and also at 20cm with the VLBA. At both wavelengths we have...
A general, three-dimensional fluid dynamics code for stars in binary systems (2001)
Beer, Martin E., Podsiadlowski, Philipp
We describe the theory and implementation of a three-dimensional fluid dynamics code which we have developed for calculating the surface geometry and circulation currents in the secondaries of...
Determination of limits on disc masses around six pulsars at 15 and 90 microns (2001)
Koch-Miramond, Lydie, Haas, Martin, Pantin, Eric, Podsiadlowski, Philipp, Naylor, Tim, Sauvage, Marc
We have searched for evidence of emission at 15 microns with ISOCAM and at 90 microns with ISOPHOT from dust orbiting six nearby pulsars, both in binaries and in isolation, located at distances...
Binary Population Synthesis: Low- and Intermediate-Mass X-Ray Binaries (2001)
Podsiadlowski, Philipp, Rappaport, Saul, Pfahl, Eric
As has only recently been recognized, X-ray binaries with intermediate-mass secondaries are much more important than previously believed. To assess the relative importance of low- and...
Irradiation Pressure Effects in Close Binary Systems (2001)
Phillips, Sam, Podsiadlowski, Philipp
We present a method for the calculation of the effects of external irradiation on the geometrical shape of the secondary in a close binary containing a compact star, the source of the radiation, and...
The quiescent light curve and evolutionary state of GRO J1655-40 (2001)
Beer, Martin E., Podsiadlowski, Philipp
We present ellipsoidal light-curve fits to the quiescent B, V, R and I light curves of GRO J1655-40 (Nova Scorpii 1994). The fits are based on a simple model consisting of a Roche-lobe filling...
Evolutionary Binary Sequences for Low- and Intermediate-Mass X-ray Binaries (2001)
Podsiadlowski, Philipp, Rappaport, Saul, Pfahl, Eric
We present the results of a systematic study of the evolution of low- and intermediate-mass X-ray binaries (LMXBs and IMXBs). Using a standard Henyey-type stellar-evolution code and a standard model...
A Comprehensive Study of Neutron Star Retention in Globular Clusters (2001)
Pfahl, Eric, Rappaport, Saul, Podsiadlowski, Philipp
(abridged) Observations of very high speeds among pulsars in the Galactic disk present a puzzle regarding neutron stars in globular clusters. The inferred characteristic speed of single pulsars in...
Formation of Compact Binaries in Globular Clusters (2001)
Rappaport, Saul, Pfahl, Eric, Rasio, Fred, Podsiadlowski, Philipp
We report here on two complementary population synthesis studies which relate directly to the formation and evolution of neutron star binaries in globular clusters. In the first, we compute the...