| Proposal ID | 069477 |
| Title | Can accretion shocks of very-low-mass stars produce X-ray emission? |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0694770101 |
| DOI | https://doi.org/10.5270/esa-z6u5ofg |
| Principal Investigator, PI | Dr Costanza Argiroffi |
| Abstract | The accretion process in young stars produces intense X-rays. Very-low-massstars (VLMS) cannot have post-shock hotter than 2MK, preventing any X-rayemission. Nonetheless 2 accreting VLMS showed X-rays from accretion shocks. Toconfirm or reject this finding we propose to observe 3 other accreting VLMS withXMM/EPIC (10ks for each target) to measure the plasma temperature, and hencedistinguish between X-rays due to corona or to accretion. Accretion-drivenX-rays in VLMS would indicate post-shocks hotter than 2MK, possible only ifaccretion velocity is higher than free fall velocity. Checking the hypothesis ofaccretion-driven X-rays in VLMS is fundamental to test whether anothermechanism, other than gravity, accelerates accreting material. |
| Publications |
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| 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 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 | 2014-01-29T00:00:00Z |
| Keywords | "low mass stars", "post shock hotter", "xray emission ?.", "XMM", "post shoc hotter", "accretion driven xray", "accretion velocity", "accretion shoc", "plasma temperature", "xray emission", "EPIC", "accelerates accreting material", "accreting vlms", "accretion process" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Costanza Argiroffi, 2014, 'Can accretion shocks of very-low-mass stars produce X-ray emissionquestionMark', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-z6u5ofg |