J/A+A/vol/page Systematic survey of of wind mass loss (Renzo, M., 2017) ================================================================================ Systematic survey of the effects of wind mass loss algorithms on the evolution of single massive stars M. Renzo C. D. Ott S. N. Shore S. E. de Mink (SIMBAD/NED BibCode) ================================================================================ Keywords: stars: evolution; massive; mass loss; winds; supernovae: general Abstract: Mass loss processes are a key uncertainty in the evolution of massive stars. They determine the amount of mass and angular momentum retained by the star, thus influencing its evolution and presupernova structure. Because of the high complexity of the physical processes driving mass loss, stellar evolution calculations must employ parametric algorithms, and usually only include wind mass loss. We carried out an extensive parameter study of wind mass loss and its effects on massive star evolution using the open-source stellar evolution code MESA. We provide a systematic comparison of wind mass loss algorithms for solar-metallicity, nonrotating, single stars in the initial mass range of 15 Msun to 35Msun. We consider combinations drawn from two hot phase (i.e., roughly the main sequence) algorithms, three cool phase (i.e., post-main-sequence) algorithms, and two Wolf-Rayet mass loss algorithms. We discuss separately the effects of mass loss in each of these phases. In addition, we consider linear wind efficiency scale factors of 1, 0.33, and 0.1 to account for suggested reductions in mass loss rates due to wind inhomogeneities. We find that the initial to final mass mapping for each zero-age main-sequence (ZAMS) mass has a \sim50% uncertainty if all algorithm combinations and wind efficiencies are considered. The ad-hoc efficiency scale factor dominates this uncertainty. While the final total mass and internal structure of our models vary tremendously with mass loss treatment, final luminosity and effective temperature are much less sensitive for stars with ZAMS mass . 30 Msun . This indicates that uncertainty in wind mass loss does not negatively affect estimates of the ZAMS mass of most single-star supernova progenitors from pre-explosion observations. Our results furthermore show that the internal structure of presupernova stars is sensitive to variations in both main sequence and post main-sequence mass loss. The compactness parameter \xi \propto M/R(M) has been identified as a proxy for the "explodability" of a given presupernova model. We find that \xi varies by as much as 30% for models of the same ZAMS mass evolved with different wind efficiencies and mass loss algorithm combinations. This suggests that the details of the mass loss treatment might bias the outcome of detailed core-collapse supernova calculations and the predictions for neutron star and black hole formation. Description: Output of stellar structure and evolution models computed with MESA, revision 7624. File summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- README 80 . This file tab3tab4.dat 98 95 Data from table 3 and 4: end of mass loss phase tab5.dat 57 6 Maximum spreads at the end of mass loss phase tab6.dat 107 32 Models at the end of the hot phase of evolution tab7.dat 85 44 Models at oxygen depletion tab8.dat 73 7 Models at the onset of core collapse -------------------------------------------------------------------------------- Byte-by-byte Description of file: tab3tab4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 Msun Mzams Zero age main sequence mass 18- 21 F4 ---- eta Wind efficiency parameter 31- 37 A7 ---- ID Wind combination identifier 40- 44 F5 Msun M Final mass 49- 52 F4 Msun M_he Helium core mass 57- 60 F4 Msun M_CO Carbon Oxygen core mass 67- 70 I4 Rsun R Final radius 73- 76 F4 dex log10_L log10 luminosity in Lsun 89- 92 F4 dex log10_Teff log10 effective temp. in K -------------------------------------------------------------------------------- Byte-by-byte Description of file: tab5.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 Msun Mzams Zero age main sequence mass 12- 15 I4 Rsun Delta_R max. spread in radii 23- 28 F6 Msun Delta_M max. spread in final masses 34- 37 F4 Msun Delta_M_he max. spread He core mass 50- 53 F4 Msun Delta_M_CO max. spread CO core mass -------------------------------------------------------------------------------- Byte-by-byte Description of file: tab6.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1 A1 --- hot_wind V=Vink+00,01, K=Kudritzki+ 16- 17 I2 Msun Mzams Zero age main sequence mass 25- 28 F4 --- eta wind efficiency parameter 36- 40 F5 Rsun R radius at end hot phase 50- 54 F5 1e4*Lsun L luminosity at end hot phase 58- 62 F5 Msun M_end_hot Mass at the end of hot phase 75- 78 F4 Msun M_he Helium core mass (at end hot phase) 92- 98 F7 1e6*years age duration of the hot phase -------------------------------------------------------------------------------- Byte-by-byte Description of file: tab7.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 Msun Mzams Zero age main sequence mass 18- 20 F3 ---- eta Wind efficiency parameter 29- 33 A5 ---- ID Wind combination identifier 42- 44 I3 Rsun R Radius at oxygen depletion 46- 50 F5 Msun M Final masses at oxygen depletion 57- 60 F4 Msun M_he He core mass at oxygen depletion 66- 69 F4 Msun M_CO CO core mass at oxygen depletion 80- 84 F5 ---- xi compactness parameter at O depl. -------------------------------------------------------------------------------- Byte-by-byte Description of file: tab8.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 Msun Mzams Zero age main sequence mass 12- 15 F4 ---- eta Wind efficiency parameter 19- 22 A4 ---- ID Wind combination identifier 27- 31 F5 ---- xi compactness parameter at pre-SN 36- 39 F4 Msun M4 Mass coordinate of entropy s=4 45- 49 F5 ---- mu4 Ertl+15 parameter (dm/dr at s=4) 54- 57 F4 Msun Mrho6 Mass coordinate of density=1e6 62- 65 F4 Msun M_CO pre-SN CO core mass 70- 73 F4 Msun M_Fe pre-SN iron core mass -------------------------------------------------------------------------------- References: arXiv:1703.09705 Author's address: Mathieu Renzo ================================================================================ (End) M. Renzo [University of Amsterdam] 03-April-2017