Artykuł w czasopiśmie
Brak miniatury
Licencja
 

Three Hypervelocity White Dwarfs in Gaia DR2: Evidence for Dynamically Driven Double-degenerate Double-detonation Type Ia Supernovae

Uproszczony widok
cris.lastimport.scopus2024-02-12T19:03:54Z
dc.abstract.enDouble detonations in double white dwarf (WD) binaries undergoing unstable mass transfer have emerged in recent years as one of the most promising Type Ia supernova (SN Ia) progenitor scenarios. One potential outcome of this “dynamically driven double-degenerate double-detonation” (D<SUP>6</SUP>) scenario is that the companion WD survives the explosion and is flung away with a velocity equal to its >1000 km s<SUP>-1</SUP> pre-SN orbital velocity. We perform a search for these hypervelocity runaway WDs using Gaia's second data release. In this paper, we discuss seven candidates followed up with ground-based instruments. Three sources are likely to be some of the fastest known stars in the Milky Way, with total Galactocentric velocities between 1000 and 3000 km s<SUP>-1</SUP>, and are consistent with having previously been companion WDs in pre-SN Ia systems. However, although the radial velocity of one of the stars is >1000 km s<SUP>-1</SUP>, the radial velocities of the other two stars are puzzlingly consistent with 0. The combined five-parameter astrometric solutions from Gaia and radial velocities from follow-up spectra yield tentative 6D confirmation of the D<SUP>6</SUP> scenario. The past position of one of these stars places it within a faint, old SN remnant, further strengthening the interpretation of these candidates as hypervelocity runaways from binary systems that underwent SNe Ia.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorShen, Ken J.
dc.contributor.authorBoubert, Douglas
dc.contributor.authorGänsicke, Boris T.
dc.contributor.authorJha, Saurabh W.
dc.contributor.authorAndrews, Jennifer E.
dc.contributor.authorChomiuk, Laura
dc.contributor.authorFoley, Ryan J.
dc.contributor.authorFraser, Morgan
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorGuillochon, James
dc.contributor.authorKotze, Marissa M.
dc.contributor.authorMaguire, Kate
dc.contributor.authorSiebert, Matthew R.
dc.contributor.authorSmith, Nathan
dc.contributor.authorStrader, Jay
dc.contributor.authorBadenes, Carles
dc.contributor.authorKerzendorf, Wolfgang E.
dc.contributor.authorKoester, Detlev
dc.contributor.authorKromer, Markus
dc.contributor.authorMiles, Broxton
dc.contributor.authorPakmor, Rüdiger
dc.contributor.authorSchwab, Josiah
dc.contributor.authorToloza, Odette
dc.contributor.authorToonen, Silvia
dc.contributor.authorTownsley, Dean M.
dc.contributor.authorWilliams, Brian J.
dc.date.accessioned2024-01-26T10:52:46Z
dc.date.available2024-01-26T10:52:46Z
dc.date.copyright2018-04-30
dc.date.issued2018
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume865
dc.identifier.doi10.3847/1538-4357/AAD55B
dc.identifier.issn0004-637X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/123375
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2018ApJ...865...15S
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal
dc.relation.pages15
dc.rightsOther
dc.sciencecloudnosend
dc.titleThree Hypervelocity White Dwarfs in Gaia DR2: Evidence for Dynamically Driven Double-degenerate Double-detonation Type Ia Supernovae
dc.typeJournalArticle
dspace.entity.typePublication