ORCID Profile
0000-0003-0375-8987
Current Organisations
Technion Israel Institute of Technology Faculty of Physics
,
Sveriges lantbruksuniversitet
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Publications
Blood transcriptomes and de novo identification of candidate loci for mating success in lekking great snipe (Gallinago media)
Publisher: Wiley
Date: 28-04-2017
DOI: 10.1111/MEC.14118
Abstract: We assembled the great snipe blood transcriptome using data from fourteen lekking males, in order to de novo identify candidate genes related to sexual selection, and determined the expression profiles in relation to mating success. The three most highly transcribed genes were encoding different haemoglobin subunits. All tended to be overexpressed in males with high mating success. We also called single nucleotide polymorphisms (SNPs) from the transcriptome data and found considerable genetic variation for many genes expressed during lekking. Among these, we identified 14 polymorphic candidate SNPs that had a significant genotypic association with mating success (number of females mated with) and/or mating status (mated or not). Four of the candidate SNPs were found in HBAA (encoding the haemoglobin α-chain). Heterozygotes for one of these and one SNP in the gene PABPC1 appeared to enjoy higher mating success compared to males homozygous for either of the alleles. In a larger data set of in iduals, we genotyped 38 of the identified SNPs but found low support for consistent selection as only one of the zygosities of previously identified candidate SNPs and none of their genotypes were associated with mating status. However, candidate SNPs generally showed lower levels of spatial genetic structure compared to noncandidate markers. We also scored the prevalence of avian malaria in a subs le of birds. Males infected with avian malaria parasites had lower mating success in the year of s ling than noninfected males. Parasite infection and its interaction with specific genes may thus affect performance on the lek.
The messy death of a multiple star system and the resulting planetary nebula as observed by JWST
Publisher: Springer Science and Business Media LLC
Date: 08-12-2022
Author Correction: The messy death of a multiple star system and the resulting planetary nebula as observed by JWST
Publisher: Springer Science and Business Media LLC
Date: 03-01-2023
Companion-launched jets and their effect on the dynamics of common envelope interaction simulations
Publisher: Oxford University Press (OUP)
Date: 25-07-2019
Abstract: We conduct three-dimensional hydrodynamic simulations of the common envelope binary interaction and show that if the companion were to launch jets while interacting with the giant primary star’s envelope, the jets would remove a substantial fraction of the envelope’s gas. We use the set-up and numerical code of an earlier common envelope study that did not include jets, with a 0.88-M⊙, 83-R⊙ red giant star and a 0.3-M⊙ companion. The assumption is that the companion star accretes mass via an accretion disc that is responsible for launching the jets which, in the simulations, are injected numerically. For the first time we conduct simulations that include jets as well as the gravitational energy released by the inspiralling core-companion system. We find that simulations with jets unbind approximately three times as much envelope mass than identical simulations that do not include jets, though the total fraction of unbound gas remains below 50 per cent for these particular simulations. The jets generate high-velocity outflows in the polar directions. The jets also increase the final core-companion orbital separation and lead to a kick velocity of the core-companion binary system. Our results show that, if able to form, jets could play a crucial role in ejecting the envelope and in shaping the outflow.
Preface of “Asymmetric Planetary Nebulae 8e”
Publisher: MDPI AG
Date: 08-07-2022
Abstract: Planetary nebulae (PNe) are the progeny of low- and intermediate-mass stars, at the exact time in their late evolution when they eject their hydrogen-rich envelopes and start their transition towards white dwarfs [...]
Related Organisations
Harvard-Smithsonian Center For Astrophysics
Location: United States of America
Technion Israel Institute Of Technology Faculty Of Physics
Location: Israel
Related Funding Activities
No related grants have been discovered for Noam Soker.