A dataset provided by the European Space Agency

Name 069477
Title Can accretion shocks of very-low-mass stars produce X-ray emission?


DOI https://doi.org/10.5270/esa-z6u5ofg
Author Dr Costanza Argiroffi
Description The accretion process in young stars produces intense X-rays. Very-low-mass stars (VLMS) cannot have post-shock hotter than 2MK, preventing any X-ray emission. Nonetheless 2 accreting VLMS showed X-rays from accretion shocks. To confirm or reject this finding we propose to observe 3 other accreting VLMS with XMM-EPIC (10ks for each target) to measure the plasma temperature, and hence distinguish between X-rays due to corona or to accretion. Accretion-driven X-rays in VLMS would indicate post-shocks hotter than 2MK, possible only if accretion velocity is higher than free fall velocity. Checking the hypothesis of accretion-driven X-rays in VLMS is fundamental to test whether another mechanism, other than gravity, accelerates accreting material.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2012-10-13T18:33:50Z/2013-01-11T02:42:50Z
Version 17.56_20190403_1200
Mission Description The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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 2014-01-29T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2014-01-29T00:00:00Z, 069477, 17.56_20190403_1200. https://doi.org/10.5270/esa-z6u5ofg