A dataset provided by the European Space Agency

Name: Toward a long-term phase-connected ephemeris for the unique X-ray binary HD49798
Published: 2014-11-26T00:00:00Z

Proposal ID	072105
Title	Toward a long-term phase-connected ephemeris for the unique X-ray binary HD49798
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0721050101
DOI	https://doi.org/10.5270/esa-c1wq4nl
Principal Investigator, PI	Dr Sandro MEREGHETTI
Abstract	HD49798 is a unique binary composed of a 13 s pulsator, most likely thefastest-rotating massive white dwarf (1.28 Msun), orbiting the brightest O-typesubdwarf. We recently obtained the first phase-connected timing solution, thatshould be extended over a longer period to unveil the small Pdot variationsexpected in this system. Their study will allow us to confirm the nature of thecompact object, to shed light on the accretion flow geometry and on the magneticfield intensity, and to improve the accuracy on the orbital parameters of thisinteresting post-common envelope and possibly SN Ia progenitor system. Only if anew period measurement is obtained during the AO12 it will be possible to extendthe phase-connection over a long time period with a small requirement on observing time.
Publications	Discovery of spin-up in the X-ray pulsar companion of the hot subdwarf HD 49798 \|Mereghetti Sandro Pintore Fabio et al. \| MNRAS \| 458-3523 \| 2016 \| 2016MNRAS.458.3523M \| http://ui.adsabs.harvard.edu/#abs/2016MNRAS.458.3523M The Million Optical - Radio/X-ray Associations (MORX) Catalogue \|Flesch Eric W. \| PASA \| 33-52 \| 2016 \| 2016PASA...33...52F \| http://ui.adsabs.harvard.edu/#abs/2016PASA...33...52F Classification of 4XMM-DR9 sources by machine learning \|Zhang Yanxia Zhao Yongheng \| MNRAS \| 503-5263 \| 2021 \| 2021MNRAS.503.5263Z \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.503.5263Z New X-ray observations of the hot subdwarf binary HD 49798/RX J0648.0-4418 \|Mereghetti S. Pintore F. et al. \| MNRAS \| 504-920 \| 2021 \| 2021MNRAS.504..920M \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.504..920M Timing the X-ray pulsating companion of the hot subdwarf HD 49798 with NICER \|Rigoselli Michela De Grandis Davide et al. \| MNRAS \| 523-3043 \| 2023 \| 2023MNRAS.523.3043R \| http://ui.adsabs.harvard.edu/#abs/2023MNRAS.523.3043R 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	2013-11-09T18:51:50Z/2013-11-10T06:11:50Z
Version	17.56_20190403_1200
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	2014-11-26T00:00:00Z
Last Update	2025-01-27
Keywords	"phase connection", "phase connected", "compact object", "binary composed", "orbital parameters", "time period", "xray binary hd49798", "shed light", "possiblysupernovaia progenitor system", "type subdwarf", "period measurement", "magnetic field intensity", "pdot variations", "accretion flow geometry"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Sandro MEREGHETTI, 2014, 'Toward a long-term phase-connected ephemeris for the unique X-ray binary HD49798', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-c1wq4nl