A dataset provided by the European Space Agency

Name: Hypervelocity White Dwarfs: Telltale Signatures of a Double-Degenerate Type Ia?
Published: 2020-07-08T22:00:00Z
License: https://creativecommons.org/licenses/by-nc/3.0/igo

Proposal ID	084513
Title	Hypervelocity White Dwarfs: Telltale Signatures of a Double-Degenerate Type Ia?
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0845130201 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0845130301
DOI	https://doi.org/10.5270/esa-pjcny8l
Principal Investigator, PI	Prof Jimmy Irwin
Abstract	The progenitors of Type Ia supernovae have remained a mystery for decades. Whileit seems certain that the explosion of a C/O white dwarf is involved, thesecondary may be a non-degenerate star or another white dwarf. In the lattercase, the companion white dwarf has an orbital velocity of 1100-2400 km/s beforethe explosion, and retains this velocity following the explosion. A recentsearch for hypervelocity white dwarfs with Gaia has yielded several intriguingcandidates for runaway survivors from double-degenerate Type Ia explosions. Wepropose short XMM-Newton exposures of these white dwarfs to place the firstX-ray constraints on potential coronal X-ray emission from these stars.
Publications	The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII O VIII and Fe L-shell Transitions \|Pan Zeyang Qu Zhijie et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez Antonio C. \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2019-05-11T20:43:03Z/2019-05-16T00:22:30Z
Version	21.51_20241115_1113
Mission Description	The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
Creator Contact	https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published	2020-07-08T22:00:00Z
Last Update	2026-07-09
Keywords	"1100 2400 km", "short xmm newton", "white dwarfs", "white dwarf", "XMM-Newton", "runaway survivors", "orbital velocity", "degenerate star", "XMM", "xray constraints", "hypervelocity white dwarfs", "companion white dwarf", "type ia supernova", "intriguing candidates"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Jimmy Irwin, 2020, 'Hypervelocity White Dwarfs: Telltale Signatures of a Double-Degenerate Type Ia?', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-pjcny8l
Rights	Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.